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Metal-free hydrogen generation from ammonia borane hydrolysis: A study on the effect of pKa of organic acid catalysts 氨硼烷水解无金属制氢:有机酸催化剂pKa影响的研究
IF 1.8 4区 化学
Journal of Chemical Sciences Pub Date : 2026-06-25 DOI: 10.1007/s12039-026-02542-7
Dinabandhu Patra, Akshay U Walke, Kamatham Narayanaswamy, Balaji Gopalan
{"title":"Metal-free hydrogen generation from ammonia borane hydrolysis: A study on the effect of pKa of organic acid catalysts","authors":"Dinabandhu Patra,&nbsp;Akshay U Walke,&nbsp;Kamatham Narayanaswamy,&nbsp;Balaji Gopalan","doi":"10.1007/s12039-026-02542-7","DOIUrl":"10.1007/s12039-026-02542-7","url":null,"abstract":"<p>Catalytic hydrogen generation from chemical hydrogen storage materials has attracted significant attention as a clean, efficient, and controllable approach for on-demand hydrogen production. While various organic acids have been utilized as catalysts for hydrogen release, previous research has primarily focused on sodium borohydride systems and not on ammonia borane (AB) hydrolysis. In this work, the effect of acid strength (pK<sub>a</sub>) on hydrogen generation from AB hydrolysis was systematically investigated using different organic acids. Among the acids tested, methanesulfonic acid (pK<sub>a1</sub> = –1.9) demonstrated the highest catalytic activity, yielding &gt;90% hydrogen with a generation rate of 6.8 mL s<sup>–1</sup>, whereas weaker acids such as acetic acid (pK<sub>a</sub> = 4.75) led to incomplete conversion. The hydrogen generation rate showed an inverse correlation with the acid pK<sub>a1</sub>, confirming that the availability of protons, particularly the most acidic proton in polyprotic acids, dictates the reaction kinetics. The apparent activation energy was found to be 42 kJ mol<sup>–1</sup>, and a kinetic isotope effect (KIE = 3.54) for citric acid catalyzed AB hydrolysis indicated that O–H bond cleavage in water is the rate-determining step. These findings highlight the key role of acid strength in AB hydrolysis and identify organic acid as an efficient single-use catalyst for sustainable, low-cost, and metal-free hydrogen generation.</p><p>With decreasing the pK<sub>a</sub> of organic acids, rate of hydrogen generation from ammonia borane hydrolysis increases.</p>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"138 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Asymmetric division in liquid-crystalline protocells: From molecular onions to primitive inheritance 液晶原始细胞的不对称分裂:从分子洋葱到原始遗传
IF 1.8 4区 化学
Journal of Chemical Sciences Pub Date : 2026-06-22 DOI: 10.1007/s12039-026-02560-5
Manasmita Das
{"title":"Asymmetric division in liquid-crystalline protocells: From molecular onions to primitive inheritance","authors":"Manasmita Das","doi":"10.1007/s12039-026-02560-5","DOIUrl":"10.1007/s12039-026-02560-5","url":null,"abstract":"<div><p>Asymmetric division plays a crucial role in the emergence of cellular diversification and developmental complexity in living systems. Yet, reproducing this behaviour in synthetic cell-like systems remains a key challenge. In a recent study, Meng <i>et al</i>. (<i>Nature</i>, 2026, <b>653</b>(8114), 418–424) reported the formation of multilamellar, liquid crystalline protocell-like droplets exploiting self-assembly of the cationic lipid didodecyldimethylammonium bromide (DDAB) with anionic nucleotide adenosine-5′-triphosphate (ATP). In the presence of an enzyme or metal cations, this DDAB-ATP droplet system underwent asymmetric division producing two non-equivalent progeny: a daughter droplet and a water-filled daughter vesicle. These progeny compartments successfully inherited functional molecular cargoes from the parent droplet while demonstrating distinct cargo retention and chemical properties, indicative of a primitive form of molecular inheritance. These findings offered valuable insights into the development of complex, life-like synthetic systems from simple, self-organizing molecular assemblies.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"138 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spectroscopic characterization of Prussian blue analogues as photoanodes in water oxidation 普鲁士蓝类似物在水氧化中作为光阳极的光谱表征
IF 1.8 4区 化学
Journal of Chemical Sciences Pub Date : 2026-06-18 DOI: 10.1007/s12039-026-02535-6
Ananth Vajhula, Saranya Bolem, Anupam Bera
{"title":"Spectroscopic characterization of Prussian blue analogues as photoanodes in water oxidation","authors":"Ananth Vajhula,&nbsp;Saranya Bolem,&nbsp;Anupam Bera","doi":"10.1007/s12039-026-02535-6","DOIUrl":"10.1007/s12039-026-02535-6","url":null,"abstract":"<p>For the past fifty years, utilizing solar energy for water splitting has garnered significant attention as a potential method to convert solar energy into chemical energy, specifically clean and renewable hydrogen fuel. Various methods for water splitting, including photocatalytic (PC) and photoelectrocatalytic (PEC) methods, utilize either homogeneous or heterogeneous catalysts. Although a wide range of semiconductor metal oxides and co-catalyst–modified oxides can generate hydrogen and/or oxygen, their overall energy-conversion efficiencies remain low and insufficient for real-world applications. This inefficiency largely arises because among the three essential stages of the water splitting reaction—solar light absorption, charge separation and transport, and catalytic reduction and oxidation reactions—the rapid charge recombination makes the efficiency insufficient, or the charge separation fails to complement the other two stages of the reaction. In this respect, Prussian blue analogues (PBA) have been identified as one of the promising and efficient cocatalysts in the PC and PEC water oxidation processes. The incorporation of PBAs as cocatalysts in semiconductors can improve oxidation and reduction reactions by offering active sites for reactions, while minimizing charge recombination and reversal. However, the application is still limited, and the analysis of the charge carrier dynamics is a key approach for improving the performance and quantifying the loss mechanisms of PBA systems. With the aim of providing researchers with the necessary knowledge to choose the appropriate measurement methods, this mini review provides a comprehensive overview of the different spectroscopy techniques, namely electrochemical impedance spectroscopy (EIS), transient absorption spectroscopy (TAS), and time-resolved photoluminescence (TRPL) to assess the carrier dynamics from activation energy and time resolution from picoseconds to milliseconds/second. The selected spectroscopic techniques will shed light on the electrocatalytic, photocatalytic, and photoelectrocatalytic behaviours of PBA systems incorporated into various metal oxides.</p>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"138 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148281503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
First-principles study of defect-induced luminescence mechanism in ternary nitride Li3AlN2 三元氮化Li3AlN2缺陷致发光机理的第一性原理研究
IF 1.8 4区 化学
Journal of Chemical Sciences Pub Date : 2026-06-17 DOI: 10.1007/s12039-026-02533-8
Jingya Tang, Peng Xu, Shun Guo, Shouze Qiu
{"title":"First-principles study of defect-induced luminescence mechanism in ternary nitride Li3AlN2","authors":"Jingya Tang,&nbsp;Peng Xu,&nbsp;Shun Guo,&nbsp;Shouze Qiu","doi":"10.1007/s12039-026-02533-8","DOIUrl":"10.1007/s12039-026-02533-8","url":null,"abstract":"<div><p>With the aid of defect engineering, binary nitrides such as GaN and Mg<sub>3</sub>N<sub>2</sub> have achieved significant advancements in the field of luminescence. However, studies on ternary nitrides, which offer more degrees of freedom for defect regulation, remain limited. The ternary compound Li<sub>3</sub>AlN<sub>2</sub>, derived from Mg<sub>3</sub>N<sub>2</sub>, has garnered some attention; however, its luminescence mechanism has not been thoroughly investigated. In this study, first-principles calculations based on the HSE06 hybrid functional were employed to explore the electronic structure, defect characteristics and defect-related optical transitions in Li<sub>3</sub>AlN<sub>2</sub>. Nitrogen vacancies, the primary intrinsic deep-level defects in the band gap, are identified as the main radiative centers, with the emission peaks obtained from the configuration coordinate diagram being in close agreement with the experimentally observed PL peaks. Among commonly used dopants in nitrides—including elements from Groups II, IV and VI—most are found to introduce very shallow defect levels. In contrast, carbon doping as well as rare-earth dopants Eu and Tb can introduce deep levels in the band gap, which are identified as potential contributors to luminescence. Our simulation results are consistent with experimental observations reported in the literature.</p><h3>Graphical abstract</h3><p>A systematic investigation into the defect-induced luminescence mechanism in the ternary nitride Li3AlN2 was conducted via fi rst-principles calculations. This investigation covered intrinsic defects, doping defects of elements from Groups II, IV, and VI, as well as common rare earth element doping.</p> <div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div></div></figure></div></div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"138 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148281033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Benchmarking density functionals for calculation of charge transfer excitations in push-pull type organic dyes 推拉型有机染料中电荷转移激发计算的基准密度泛函
IF 1.8 4区 化学
Journal of Chemical Sciences Pub Date : 2026-06-17 DOI: 10.1007/s12039-026-02517-8
Raghavendra Venkatraman
{"title":"Benchmarking density functionals for calculation of charge transfer excitations in push-pull type organic dyes","authors":"Raghavendra Venkatraman","doi":"10.1007/s12039-026-02517-8","DOIUrl":"10.1007/s12039-026-02517-8","url":null,"abstract":"<div><p>Time-dependent density functional theory (TDDFT) has been the most widely used quantum computational technique to calculate the electronic transition energies of both organic and inorganic molecules. Calculation of absorption maximum of organic molecules through TD-DFT and its comparison with the experimental values has been a challenge throughout. In this investigation, benchmarking of density functionals has been carried out with the objective of using TD-DFT approach for excited state calculations of triphenylamine (TPA) based D-π-A systems. TPA forms a major class of dyes investigated as sensitizers for dye-sensitized solar cells (DSSC). Bulk solvent effects have been modelled using polarizable continuum model (PCM). Solvent’s effect on calculated absorption maximum depending upon whether the solvent is included at the initial geometry optimization stage has also been studied. Eighteen different functionals from various rungs of Jacob’s ladder of density functionals, amounting to different values of Hartree-Fock Exchange (HFX) and the mean field Hartree-Fock method have been employed to model 46 TPA based D-π-A systems. Results show that the functionals with higher amount of HFX tend to perform better in calculation of the charge transfer excitation energy.</p><h3>Graphical abstract</h3><p>The graphical abstract illustrates a comparison between Hartree–Fock exchange (HFX) and density functional exchange (DFX) in hybrid functionals for accurately describing chargetransfer excitations in triphenylamine-based D–π–A molecular architectures. For well charge-separated systems, functionals containing a higher fraction of HFX generally exhibit better performance.</p>\u0000<div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div></div></figure></div></div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"138 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148281500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Improved control of selective bond dissociation in isotopically substituted ozone molecule (^{18})O(^{16})O(^{16})O using simple Gaussian IR + UV pulses as an illustrative prescription for overcoming IVR 利用简单的高斯IR + UV脉冲改善了对同位素取代臭氧分子(^{18}) O (^{16}) O (^{16}) O选择性键解离的控制,作为克服IVR的说导性处方
IF 1.8 4区 化学
Journal of Chemical Sciences Pub Date : 2026-06-17 DOI: 10.1007/s12039-026-02513-y
Bhavesh K Shandilya, Manabendra Sarma, S Adhikari, Manoj K Mishra
{"title":"Improved control of selective bond dissociation in isotopically substituted ozone molecule (^{18})O(^{16})O(^{16})O using simple Gaussian IR + UV pulses as an illustrative prescription for overcoming IVR","authors":"Bhavesh K Shandilya,&nbsp;Manabendra Sarma,&nbsp;S Adhikari,&nbsp;Manoj K Mishra","doi":"10.1007/s12039-026-02513-y","DOIUrl":"10.1007/s12039-026-02513-y","url":null,"abstract":"<p>Vibrational dynamics of the isotopically substituted ozone molecule <span>(^{18})</span>O<span>(^{16})</span>O<span>(^{16})</span>O has been mapped using simple Gaussian IR pulses. The temporal profile of the appropriately positioned vibrational wave packets are examined for use of simple Gaussian UV pulses of suitable width and frequency such that Franck–Condon transport of these vibrational wave packets is routed into the desired dissociation channel on the upper repulsive surface. This careful dovetailing of IR + UV pulses is shown to selectively dissociate the desired bond with considerable yield and branching ratios as high as (<span>(^{18})</span>O + <span>(^{16})</span>O–<span>(^{16})</span>O)/(<span>(^{18})</span>O–<span>(^{16})</span>O + <span>(^{16})</span>O) = 33.6 for 15 fs UV pulse and 171.1 for 10 fs UV pulse. Similarly, the branching ratio (<span>(^{18})</span>O–<span>(^{16})</span>O + <span>(^{16})</span>O)/(<span>(^{18})</span>O + <span>(^{16})</span>O–<span>(^{16})</span>O) increases from 26.3 for 15 fs UV pulse to 60.1 for 10 fs UV pulse. Narrowing of UV pulse width is seen to increase selectivity only with a slight decrease in total yield. The scheme outlined here provides an effective prescription for overcoming the innate internal vibrational relaxation (IVR) built into this illustrative system.</p>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"138 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148281499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Selective phosphate adsorption from wastewater using dual Lewis acid catalyst: A metal-free approach 用双路易斯酸催化剂选择性吸附废水中的磷酸盐:一种无金属的方法
IF 2 4区 化学
Journal of Chemical Sciences Pub Date : 2026-06-15 DOI: 10.1007/s12039-026-02532-9
Anupama Kisku, Anjali Ganai, Pranab Sarkar
{"title":"Selective phosphate adsorption from wastewater using dual Lewis acid catalyst: A metal-free approach","authors":"Anupama Kisku,&nbsp;Anjali Ganai,&nbsp;Pranab Sarkar","doi":"10.1007/s12039-026-02532-9","DOIUrl":"10.1007/s12039-026-02532-9","url":null,"abstract":"<div><p>Excess phosphate in aquatic environments is a major contributor to eutrophication, disrupting the ecological balance and posing serious threats to aquatic life. This study investigates the application of a metal-free, boron-based dual Lewis acid (DLA) catalyst for the selective removal of phosphate anions from contaminated water sources. The DLA catalyst combines robust stability, dual binding sites, charge delocalization, high selectivity and recyclability, making it a suitable adsorbent. Density functional theory calculations were employed to evaluate adsorption energies, replacement energies, and charge transfer interactions between various anions and the boron-based DLA catalyst. Phosphate anions exhibited more negative adsorption and replacement energies than competing ions (<span>({text {NO}_{2}^{-}})</span>, <span>({text {SO}_{4}^{2-}})</span>, <span>({text {NO}_{3}^{-}})</span>, <span>({text {HCO}_{3}^{-}})</span> and <span>({text {Cl}^{-}})</span>), hence possesses a stronger and more selective binding affinity. Natural bond orbital analysis validate significant charge transfer from phosphate to the DLA catalyst, stabilizing boron centers by occupying vacant p-orbitals. Speciation graphs identified optimal pH for targeted removal or reaction. Hence, this boron-based DLA catalysts can act as a metal-free, recyclable materials for selective removal of phosphate ions from contaminated water sources.</p><h3>Graphical abstract</h3><p>A metal-free, boron-based dual lewis acid catalyst selectively adsorbs phosphate anions from wastewater sources. Density functional theory calculations revealed that dual lewis acid catalyst exhibits strong binding affinity, high selectivity over competing anions (e.g. NO<sub>2</sub><sup>−</sup>, HCO<sub>3</sub><sup>−</sup> etc.), establishing it as an effective adsorbent for phosphate removal and water purification.\u0000</p><div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div></div></figure></div></div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"138 3","pages":""},"PeriodicalIF":2.0,"publicationDate":"2026-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148247709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Investigation of charge recombination losses and charge collection efficiency in DPP-DTT:PC70BM based BHJ solar cell from impedance spectroscopy 阻抗谱法研究DPP-DTT:PC70BM基BHJ太阳能电池的电荷复合损失和电荷收集效率
IF 2 4区 化学
Journal of Chemical Sciences Pub Date : 2026-06-15 DOI: 10.1007/s12039-026-02531-w
Chandan V Gupta, Sangita Bose
{"title":"Investigation of charge recombination losses and charge collection efficiency in DPP-DTT:PC70BM based BHJ solar cell from impedance spectroscopy","authors":"Chandan V Gupta,&nbsp;Sangita Bose","doi":"10.1007/s12039-026-02531-w","DOIUrl":"10.1007/s12039-026-02531-w","url":null,"abstract":"<div><p>In this article, steady state and impedance spectroscopy (IS) is used to quantitatively understand the role of charge carrier dynamics on the performance of a bulk-heterojunction (BHJ) organic solar cell, with the active layer blend consisting of Poly-thieno[3,2b] thiophene-diketopyrrolopyrrole-co-thiophene as the donor and C70-butyric acid methyl ester as the acceptor (DPP-DTT:PC<sub>70</sub>BM). Optimized devices with an active layer thickness of ~220 nm show a fill factor (FF) of only 41%. Current density (<i>J</i>)–voltage (<i>V</i>) characteristics measured under dark as well as under varying light intensity indicate the presence of Shockley–Read–Hall recombination losses. IS carried out under open circuit conditions, under varying light intensity and varying bias voltages at 1 SUN illumination, further reveals high recombination losses. Furthermore, a low charge collection efficiency  is obtained, which quantitatively explains the low FF in the studied BHJ solar cell. This is correlated with the low film quality of the solution-processed active layer, which is responsible for the presence of the trap states limiting the performance of the device.</p><h3>Graphical abstract</h3><p>This work investigates charge recombination losses and charge collection efficiency (CCE) in DPP-DTT:PC70BM bulk-heterojunction organic solar cells with relatively thick active layer thickness using impedance spectroscopy. The study identifies trap-assisted recombination which is correlated with poor film quality as key factors limiting CCE and consequently the device performance.\u0000</p><div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div></div></figure></div></div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"138 3","pages":""},"PeriodicalIF":2.0,"publicationDate":"2026-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148247712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Broadband impulsive stimulated Raman spectroscopy: A fluorescence-background-free alternative to conventional Raman spectroscopy 宽带脉冲受激拉曼光谱:传统拉曼光谱的无荧光背景替代方案
IF 2 4区 化学
Journal of Chemical Sciences Pub Date : 2026-06-15 DOI: 10.1007/s12039-026-02537-4
Shaina Dhamija, Garima Bhutani, Arijit K De
{"title":"Broadband impulsive stimulated Raman spectroscopy: A fluorescence-background-free alternative to conventional Raman spectroscopy","authors":"Shaina Dhamija,&nbsp;Garima Bhutani,&nbsp;Arijit K De","doi":"10.1007/s12039-026-02537-4","DOIUrl":"10.1007/s12039-026-02537-4","url":null,"abstract":"<div><p>Impulsive stimulated Raman spectroscopy using a chirped broadband probe pulse (broadband ISRS) has attracted significant attention due to its numerous advantages over spontaneous Raman spectroscopy, stimulated Raman spectroscopy (SRS), and ISRS with a probe pulse spectrally degenerate with the Raman pump pulse (degenerate ISRS). In this article, we present a non-mathematical perspective on ISRS, covering its machinery and applications. In particular, we demonstrate how broadband ISRS can extract a tiny Raman signal from a strong fluorescence background, both having the same Stokes shift.</p><h3>Graphical abstract</h3><p>The usefulness of broadband impulsive stimulated Raman spectroscopy over conventional approaches for isolating a feeble Raman signal with the same Stokes shift as a strong fluorescence background is demonstrated.\u0000</p><div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div></div></figure></div></div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"138 3","pages":""},"PeriodicalIF":2.0,"publicationDate":"2026-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148247710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A second life for waste tires: Nitrogen-incorporated activated carbon for dual applications in supercapacitors and bisphenol-A removal 废轮胎的第二生命:含氮活性炭在超级电容器和双酚A去除中的双重应用
IF 2 4区 化学
Journal of Chemical Sciences Pub Date : 2026-06-15 DOI: 10.1007/s12039-026-02540-9
Shiva Deepti Rangu, Shreeganesh Subraya Hegde, Harsha S Rangappa, Rajesh Kumar Sethi, Dibyananda Majhi, Subrahmanyam Challapalli
{"title":"A second life for waste tires: Nitrogen-incorporated activated carbon for dual applications in supercapacitors and bisphenol-A removal","authors":"Shiva Deepti Rangu,&nbsp;Shreeganesh Subraya Hegde,&nbsp;Harsha S Rangappa,&nbsp;Rajesh Kumar Sethi,&nbsp;Dibyananda Majhi,&nbsp;Subrahmanyam Challapalli","doi":"10.1007/s12039-026-02540-9","DOIUrl":"10.1007/s12039-026-02540-9","url":null,"abstract":"<div><p>The sustainable valorization of waste materials into high-performance functional materials has garnered significant attention in environmental remediation and energy storage domains. In this study, waste tire-derived carbon (TC) was chemically activated using potassium hydroxide (KOH), followed by nitrogen incorporation through urea treatment. The adsorption and electrochemical performances of tire-derived activated carbon (TAC) and urea treated tire-derived activated carbon (U-TAC) were compared. The synergic effect of KOH activation and urea treatment resulted in improved surface properties, as verified through various morphological and chemical characterizations, including XPS, FTIR, BET, SEM and Raman spectroscopy. These modifications significantly improved both the specific capacitance as an electrode and the adsorption capacity for pollutant of the material. The electrochemical energy storage measurements revealed a remarkable improvement in specific capacitance to 70 F g<sup>–1</sup> (TAC) and to 129 F g<sup>–1</sup> (U-TAC) from 43 F g<sup>–1</sup> (TC) in 1M H<sub>2</sub>SO<sub>4</sub> electrolyte. During adsorption studies TC, TAC and U-TAC showed removal efficiencies of 19, 56 and 87%, respectively for bisphenol A (BPA) using a 50 ppm BPA solution at a 0.5 g L<sup>–1</sup> dosage, demonstrating superior removal efficiency for endocrine-disrupting chemicals. Furthermore, U-TAC was tested for column adsorption, in which 1 g of adsorbent removed 70% of the pollutant flowing through it at a rate of 1 mL min<sup>–1</sup>. The urea treatment of TAC successfully incorporated nitrogen functionalities, which increased its affinity toward organic polar contaminants and also contributed to enhanced electrochemical energy storage behavior. The findings suggest that U-TAC is a promising bifunctional material for applications in wastewater treatment and energy storage, contributing to both environmental protection and circular economy goals.</p><h3>Graphical abstract</h3><p>The pyrolized tire carbon (TC) was first activated with KOH (TAC) and then N-doping was done with urea(U-TAC). The specific capacitance at 0.5 A g<sup>−1</sup> are 43, 70 &amp; 129 F g-1 for TC, TAC and U-TAC respectively in supercapacitor studies. The adsorption efficiencies are 19 (TC), 56 (TAC) &amp; 87 (U-TAC) % for BPA from 50ppm pollutant with 0.5 g L<sup>−1</sup> dosage.</p>\u0000<div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div></div></figure></div></div>","PeriodicalId":616,"journal":{"name":"Journal of Chemical Sciences","volume":"138 3","pages":""},"PeriodicalIF":2.0,"publicationDate":"2026-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148247711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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