Journal of Electroanalytical Chemistry最新文献

Heteroatom doped MoO3 as efficient electrocatalyst towards hydrogen evolution reaction in acidic as well as alkaline medium 掺杂杂原子的 MoO3 作为高效电催化剂在酸性和碱性介质中进行氢进化反应

IF 4.1 3区化学

Journal of Electroanalytical Chemistry Pub Date : 2024-11-26 DOI: 10.1016/j.jelechem.2024.118827

Arti Maurya, Nidhi Pradhan, Mahendra Yadav

{"title":"Heteroatom doped MoO3 as efficient electrocatalyst towards hydrogen evolution reaction in acidic as well as alkaline medium","authors":"Arti Maurya, Nidhi Pradhan, Mahendra Yadav","doi":"10.1016/j.jelechem.2024.118827","DOIUrl":"10.1016/j.jelechem.2024.118827","url":null,"abstract":"<div><div>In general, slow kinetics and cost concern impede the development of electrocatalyst for water splitting. For practical application, the design and development of an inexpensive catalyst efficient towards hydrogen evolution reaction (HER) in acidic as well as alkaline medium is crucial. Here, Ruthenium (Ru) and MoO<sub>3</sub> alone are not efficient for HER in the alkaline medium but, Ni and Ru doped MoO<sub>3</sub> nanosphere shaped material (Ni-Ru-MoO<sub>3)</sub> prepared by the facile two-step synthesis process, acts as efficient electrocatalyst towards HER in acidic as well as alkaline medium. The low cost of the prepared catalyst and comparable activity with costly noble metal catalyst is novelty of this work. Due to the synergistic effect of Ni and Ru doping on the MoO<sub>3</sub> and enhanced porosity Ni-Ru-MoO<sub>3</sub> acts as efficient catalyst. It merely requires 59 and 151 mV overpotential to reach 10 mA/cm<sup>2</sup> of current density and exhibits small Tafel slope values as 64 and 68 mV/dec for HER in 1 M KOH and 0.5 M H<sub>2</sub>SO<sub>4</sub> solution, respectively, which are comparable to the respective values obtained for benchmark costly catalyst Pt/C. In addition, this catalyst shows remarkable stability even at high current density of 50 mA/cm<sup>2</sup> and time 24 h, low value of charge transfer resistance and high value of electrochemically active surface area, suggesting its substantial electronic conductivity and high electrocatalytic activity. This work presents a good strategy for tuning the electronic structure of MoO<sub>3</sub> to make it an efficient catalyst for HER by simply doping it with hetero elements.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"977 ","pages":"Article 118827"},"PeriodicalIF":4.1,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Tailoring Pd-Co/PPD/NS composite electrode for efficient electrocatalytic dechlorination of 4-chlorophenol 定制 Pd-Co/PPD/NS 复合电极，实现 4-氯苯酚的高效电催化脱氯

IF 4.1 3区化学

Journal of Electroanalytical Chemistry Pub Date : 2024-11-24 DOI: 10.1016/j.jelechem.2024.118825

Yuanjie Liang , Xia Li , Qiang Xu , Zikang Hou

{"title":"Tailoring Pd-Co/PPD/NS composite electrode for efficient electrocatalytic dechlorination of 4-chlorophenol","authors":"Yuanjie Liang , Xia Li , Qiang Xu , Zikang Hou","doi":"10.1016/j.jelechem.2024.118825","DOIUrl":"10.1016/j.jelechem.2024.118825","url":null,"abstract":"<div><div>To address the challenges of slow bio-degradation and high toxicity of organic chlorophenols, some high-efficiency treatment strategies have been proposed. In this study, a high-performance palladium-cobalt/poly-(phenylenediamine)/nickel sponge (Pd-Co/PPD/NS) composite electrode was fabricated and utilized for electrocatalytic dechlorination of chlorophenol. Surface micromorphology, elemental distribution, and structural features of the electrodes were thoroughly investigated. Furthermore, effects of p-phenylenediamine concentration, chlorophenol concentration, cathode potential, and electrolyte content on electrocatalytic dechlorination efficiency were comprehensively studied. The presence of polyphenylene diamine greatly improved interfacial compatibility, thus promoting more Pd-Co particles deposition and creating additional catalytic active sites. Moreover, the larger conjugated structure in polyphenylene diamine facilitated electron transfer between electrode surface and electrolyte, resulting in high conductivity and substantially reducing charge transfer resistance. These enhancements greatly increased the electrocatalytic dechlorination efficiency. Under optimal reaction conditions, the dechlorination efficiency of the electrode reached 93.4 % with a mass activity of 25.3 min<sup>−1</sup>g<sub>pd</sub><sup>−1</sup>. Besides, the corresponding current efficiency also achieved about 24.6 %. Consequently, the Pd-Co/PPD/NS composite electrode we prepared also exhibited excellent recycling stability and high resistance to interference from negative ions.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"977 ","pages":"Article 118825"},"PeriodicalIF":4.1,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Solvent effect on facile in situ precipitation of nickel–iron hydroxide for enhanced overall water splitting

IF 4.1 3区化学

Journal of Electroanalytical Chemistry Pub Date : 2024-11-23 DOI: 10.1016/j.jelechem.2024.118826

Giljung Kim , Yujin Son , Yunji Jeong, Moonsu Kim, Gibaek Lee

{"title":"Solvent effect on facile in situ precipitation of nickel–iron hydroxide for enhanced overall water splitting","authors":"Giljung Kim , Yujin Son , Yunji Jeong, Moonsu Kim, Gibaek Lee","doi":"10.1016/j.jelechem.2024.118826","DOIUrl":"10.1016/j.jelechem.2024.118826","url":null,"abstract":"<div><div>Efficient and economical electrocatalysts are essential for addressing the high overpotential challenges of the oxygen evolution reaction (OER) in electrochemical water splitting. This study explores the synthesis of nickel–iron hydroxide (NiFeOH) catalysts <em>via in situ</em> precipitation, focusing on the impact of the solvent composition on the morphology and catalytic performance of the material. The volumetric ratio of H<sub>2</sub>O to ethanol in the solvent mixture was systematically varied, revealing that higher proportions of H<sub>2</sub>O promoted the formation of thicker and larger needle-like NiFeOH structures. In contrast with the common preference for thin needle-shaped morphologies, our findings reveal that these thicker structures exhibit superior electrocatalytic activity. This enhanced performance is attributed to the higher iron content and faster reaction kinetics promoted by the increased permittivity of water-rich environments. The optimized NiFeOH catalysts, particularly those with higher water content, exhibit excellent OER and hydrogen evolution reaction (HER) activities, achieving low overpotentials of 288 mV at 100 mA cm<sup>−2</sup> for OER and 131 mV at 10 mA cm<sup>−2</sup> for HER. Furthermore, long-term stability tests confirmed the robustness of the catalysts, with minimal morphological degradation and consistent performance in overall water splitting. This work highlights the significance of solvent effects in tailoring the morphology and catalytic properties of NiFeOH, providing valuable insights for the design of effective water-splitting electrocatalysts.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"977 ","pages":"Article 118826"},"PeriodicalIF":4.1,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Enhancing catalytic efficiency: InSe quantum dots’ role in hydrogen evolution reaction 提高催化效率：铟硒量子点在氢进化反应中的作用

IF 4.1 3区化学

Journal of Electroanalytical Chemistry Pub Date : 2024-11-21 DOI: 10.1016/j.jelechem.2024.118806

Mahmoud A.S. Sakr , Hazem Abdelsalam , Ghada M Abdelrazek , Nahed H. Teleb , Omar H. Abd-Elkader , Yushen Liu , Qinfang Zhang

{"title":"Enhancing catalytic efficiency: InSe quantum dots’ role in hydrogen evolution reaction","authors":"Mahmoud A.S. Sakr , Hazem Abdelsalam , Ghada M Abdelrazek , Nahed H. Teleb , Omar H. Abd-Elkader , Yushen Liu , Qinfang Zhang","doi":"10.1016/j.jelechem.2024.118806","DOIUrl":"10.1016/j.jelechem.2024.118806","url":null,"abstract":"<div><div>This study investigates the structural, electronic, and adsorption properties of InSe quantum dots. We focus on hydrogen atom adsorption and its implications on quantum stability chemical parameters and the hydrogen evolution reaction (HER). Optimized structures reveal distinct atomic interactions post-H adsorption, affecting bond lengths, dihedral angles, and bond angles. Adsorption energies confirm spontaneous H-adsorption across various sites, highlighting preferences for specific interactions. Electronic properties analysis showcases significant shifts in energy levels, energy gaps, and chemical parameters following H-atom adsorption, indicating a transition towards more insulating states. The catalytic performance for HER is assessed through calculated free energy changes (ΔG), demonstrating superior catalytic activity. Comparison with a Pt catalyst underscores the potential of these quantum dots as efficient HER catalysts. For instance, the ΔG value decreases to 0.005 eV in InSe-quantum dots passivated with F- and H-atoms at the edges. These findings contribute to understanding the role of InSe quantum dots in enhancing the HER reaction, offering insights for potential application in electrocatalysis and energy conversion.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"976 ","pages":"Article 118806"},"PeriodicalIF":4.1,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142705395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Developing efficient anodic electrocatalyst: Three-dimensional interconnected network of bimetallic Pd–Ni aerogel for advanced electrocatalysis of ethanol 开发高效阳极电催化剂：用于乙醇高级电催化的双金属钯镍气凝胶三维互连网络

IF 4.1 3区化学

Journal of Electroanalytical Chemistry Pub Date : 2024-11-21 DOI: 10.1016/j.jelechem.2024.118810

Masoud Rafigh Esmaeilzaei, Hamideh Saravani, Ahmad Reza Abbasian

{"title":"Developing efficient anodic electrocatalyst: Three-dimensional interconnected network of bimetallic Pd–Ni aerogel for advanced electrocatalysis of ethanol","authors":"Masoud Rafigh Esmaeilzaei, Hamideh Saravani, Ahmad Reza Abbasian","doi":"10.1016/j.jelechem.2024.118810","DOIUrl":"10.1016/j.jelechem.2024.118810","url":null,"abstract":"<div><div>This paper introduces a valuable and easy strategy for connecting metallic nanoparticles to assemble a three-dimensional (3D) network of bimetallic palladium-nickel aerogel. This research provides several unique advantages (e.g., facile, surfactant-free, one-pot, and fast) without any chemical destabilizer compounds. The 3D metallic superstructure is formed during the reduction of Ni<sup>2+</sup> and Pd<sup>2+</sup> ions by adding NaBH<sub>4</sub>, followed by CO<sub>2</sub> supercritical drying. Additionally, the gelation kinetics are explored by raising the temperature to create an efficient anisotropic atmosphere to assemble the 3D Pd-Ni hydrogels. This study demonstrated that the alteration in anisotropic conditions affects the formation of a 3D hydrogel. The production of a 3D network assembled by the extended nanowires with high porosity and plenty of open pores is confirmed by various analyses. The Pd-Ni aerogel is employed as a self-supported electrocatalyst for decomposing EtOH fuel and reflects the more prominent electrocatalytic activity relative to Pd/C. The existence of nickel will facilitate the adsorption of hydroxyl groups on the surface of the resulting aerogel. These adsorbed hydroxyls react with the generated intermediates and release the blocked active sites by carbonaceous intermediates, thereby affecting efficiently the ethanol oxidation.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"976 ","pages":"Article 118810"},"PeriodicalIF":4.1,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Chemically grown Bi2MoX6 (X = O, S, and Se) nanostructures for efficient electrochemical hydrogen evolution reaction 用于高效电化学氢进化反应的化学生长 Bi2MoX6（X = O、S 和 Se）纳米结构

IF 4.1 3区化学

Journal of Electroanalytical Chemistry Pub Date : 2024-11-20 DOI: 10.1016/j.jelechem.2024.118823

Sandesh H. Narwade , Balaji G. Ghule , Nanasaheb M. Shinde , Rushikesh R. Suryawanshi , Kyeongnam Kang , Ji-Hyun Jang , Arvind H. Jadhav , Rajaram S. Mane

{"title":"Chemically grown Bi2MoX6 (X = O, S, and Se) nanostructures for efficient electrochemical hydrogen evolution reaction","authors":"Sandesh H. Narwade , Balaji G. Ghule , Nanasaheb M. Shinde , Rushikesh R. Suryawanshi , Kyeongnam Kang , Ji-Hyun Jang , Arvind H. Jadhav , Rajaram S. Mane","doi":"10.1016/j.jelechem.2024.118823","DOIUrl":"10.1016/j.jelechem.2024.118823","url":null,"abstract":"<div><div>Here, we present the fabrication of an effective and chemical bath deposition (CBD) of Bi<sub>2</sub>MoX<sub>6</sub> (X = O, S, and Se) electrocatalyst for efficient electrochemical hydrogen evolution reaction (HER) activity. To enhance the electrochemical activity of Bi<sub>2</sub>MoO<sub>6</sub> (BMO) electrode, the influence of sulfurization and selenization on the wet chemically synthesized BMO has been extensively studied here. These BMO, Bi<sub>2</sub>MoS<sub>6</sub> (BMS), and Bi<sub>2</sub>MoSe<sub>6</sub> (BMSe) nanostructured developed on nickel-foam are synthesized by a mild two-stage reaction process; a CBD following a sulfo-selenization procedure on BMO. Compared to BMO and BMS electrocatalysts, the BMSe has shown a higher HER activity through a lower overpotential about 120 mV at 10 mA cm<sup>−2</sup> and a lower value of Tafel slope (57 mV dec<sup>−1</sup>). Surface morphology analysis endows hydrangea flower-type petals, nanosheets, and <em>E. coli</em> bacteria-type surface morphologies for BMO, BMS, and BMSe electrocatalysts, respectively. Thus, this article gives an easy tactic for enhancing the electrochemical HER activity of the BMO through the process of sulfurization/selenization at room temperature (25–27 °C).</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"976 ","pages":"Article 118823"},"PeriodicalIF":4.1,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Low-Cost and Eco-Friendly method for activating carbon felt using hypochlorite for electrochemical applications 在电化学应用中使用次氯酸盐活化碳毡的低成本环保方法

IF 4.1 3区化学

Journal of Electroanalytical Chemistry Pub Date : 2024-11-19 DOI: 10.1016/j.jelechem.2024.118816

Branimir N. Grgur , Vuk V. Radmilović , Houcheng Zhang , Lazar Rakočević , Aleksandra S. Popović

{"title":"Low-Cost and Eco-Friendly method for activating carbon felt using hypochlorite for electrochemical applications","authors":"Branimir N. Grgur , Vuk V. Radmilović , Houcheng Zhang , Lazar Rakočević , Aleksandra S. Popović","doi":"10.1016/j.jelechem.2024.118816","DOIUrl":"10.1016/j.jelechem.2024.118816","url":null,"abstract":"<div><div>Pristine carbon felt is activated and functionalized through a cost-effective, eco-friendly method by immersion in a commercial 5 wt% hypochlorite solution. Electrochemical analyses, including cyclic voltammetry, galvanostatic charge–discharge tests, capacitance, and impedance measurements at 1 Hz, reveal that the activated carbon felt exhibits a twenty-fold enhancement in performance compared to its pristine counterpart. Pristine and activated carbon felt are characterized using scanning electron microscopy, X-ray photoelectron spectroscopy, contact angle measurement, and water uptake tests confirming the significant changes in material properties. To further validate the activation process, polypyrrole is galvanostatically electrodeposited on both pristine and activated carbon felts, with their electrochemical behaviors serving as a model system. The findings indicate a substantial improvement of activated carbon felt, with fourth times increase in capacity, highlighting the potential for advanced applications.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"976 ","pages":"Article 118816"},"PeriodicalIF":4.1,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142705396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Microwave-Assisted synthesis of interconnected holey nanosheets of zinc vanadate for High-Performance supercapacitor 微波辅助合成用于高性能超级电容器的孔状钒酸锌纳米片

IF 4.1 3区化学

Journal of Electroanalytical Chemistry Pub Date : 2024-11-19 DOI: 10.1016/j.jelechem.2024.118809

A.T. Avatare , R.S. Redekar , J.L. Chouhan , Sunny Yadav , I.H. Lee , S.B. Patil , N.L. Tarwal

{"title":"Microwave-Assisted synthesis of interconnected holey nanosheets of zinc vanadate for High-Performance supercapacitor","authors":"A.T. Avatare , R.S. Redekar , J.L. Chouhan , Sunny Yadav , I.H. Lee , S.B. Patil , N.L. Tarwal","doi":"10.1016/j.jelechem.2024.118809","DOIUrl":"10.1016/j.jelechem.2024.118809","url":null,"abstract":"<div><div>Developing electrode materials with high energy density and cyclic stability is crucial for advanced supercapacitor (SC) devices in the field of green energy technologies. However, the choice of electrode material and its synthesis approaches significantly impact the electrochemical performance of these devices. In this study, the effect of microwave power on the synthesis process, physicochemical properties and electrochemical performance of zinc vanadate (ZVO) is investigated. The interconnected “holey” ZVO nanosheets are synthesized using a microwave-assisted chemical synthesis process with different microwave powers with shorter reaction time (3 min). X-ray diffraction confirmed that the synthesized ZVO has an orthorhombic crystal structure. At lower microwave power (450 W), interconnected holey nanosheets are observed. When the power is increased above 450 W, the nanosheets disintegrated into an interconnected network of nanopebbles. The ZVO nanosheet electrode showed a specific capacity of 145.16 mAh/g and a specific capacitance of 871.01 F/g at 5 A/g, with a capacity retention of 96% after 5000 cycles. Furthermore, an aqueous asymmetric hybrid supercapacitor (AHSC) device with ZVO-1//AC configuration achieved a specific energy density of 32.77 W/kg at a power density of 400 W/kg with a capacity retention of 82.8% after 2000 cycles. These findings strongly indicate that the developed ZVO holey nanosheets can be used as a potential electrode material for high-performance SC devices.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"976 ","pages":"Article 118809"},"PeriodicalIF":4.1,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Beneficial surface defect engineering of MoS2 electrocatalyst for efficient hydrogen evolution reaction 有利于高效氢进化反应的 MoS2 电催化剂表面缺陷工程

IF 4.1 3区化学

Journal of Electroanalytical Chemistry Pub Date : 2024-11-19 DOI: 10.1016/j.jelechem.2024.118814

Jyoti Ganapati Badiger , Maheswari Arunachalam , Rohini Subhash Kanase , Suzan Abdelfattah Sayed , Kwang-Soon Ahn , Soon Hyung Kang

{"title":"Beneficial surface defect engineering of MoS2 electrocatalyst for efficient hydrogen evolution reaction","authors":"Jyoti Ganapati Badiger , Maheswari Arunachalam , Rohini Subhash Kanase , Suzan Abdelfattah Sayed , Kwang-Soon Ahn , Soon Hyung Kang","doi":"10.1016/j.jelechem.2024.118814","DOIUrl":"10.1016/j.jelechem.2024.118814","url":null,"abstract":"<div><div>Hydrogen evolution reaction (HER) is considered the most efficient method for hydrogen production using an effective electrocatalyst. Molybdenum disulfide (MoS<sub>2</sub>), with its unique 2D layered structure, is the most promising electrocatalyst. This is attributed to its flexibility, which facilitates the exploration of various MoS<sub>2</sub> phases and properties, closely mirroring those of platinum, particularly its Gibbs energy (ΔG<sub>H* ̃</sub> 0.08 eV), which makes MoS<sub>2</sub> an excellent electrocatalyst. However, its low electrical conductivity and inert basal planes limit its effectiveness for HER. This study utilized a facile hot-gun approach to successfully introduce sulfur vacancies, simultaneously incorporating oxygen from the air, which partially occupied these vacancies. This process resulted in the formation of an intermediate MoO<sub>x</sub>S<sub>y</sub> interlayer, yielding a highly effective electrocatalyst. Exposure to the hot gun for a short duration led to several changes, notably expanding the interlayer spacing and altering the atomic S:O ratio from approximately 75 % to 57 %, primarily affecting the MoS<sub>2</sub> structure. The optimal duration for hot-gun treatment was determined to be 30 s, enhancing electrochemical activity for HER, with an overpotential of 486 mV vs. RHE (briefly marked as V<sub>RHE</sub>) at a current density of 10 mA·cm<sup>−2</sup> and Tafel slope of 224 mV·dec<sup>-1</sup>. The improvement in basal active sites, attributable to the formation of defects from sulfur vacancies and partial passivation by oxygen at these sites, was identified as the key factor for this enhanced performance.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"976 ","pages":"Article 118814"},"PeriodicalIF":4.1,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142705394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Functional Au@Cu/Cu2O/C composites derived from 2D Cu-based metal–organic framework for sensitive label-free electrochemical immunoassay 源自二维铜基金属有机框架的功能性 Au@Cu/Cu2O/C 复合材料用于灵敏的无标记电化学免疫分析

IF 4.1 3区化学

Journal of Electroanalytical Chemistry Pub Date : 2024-11-19 DOI: 10.1016/j.jelechem.2024.118815

Baojun Han , Shuqin Fang , Yu Wang, Jiajun Ma, Jinling Wu, Xiaoming Ma, Qingchun Lan

{"title":"Functional Au@Cu/Cu2O/C composites derived from 2D Cu-based metal–organic framework for sensitive label-free electrochemical immunoassay","authors":"Baojun Han , Shuqin Fang , Yu Wang, Jiajun Ma, Jinling Wu, Xiaoming Ma, Qingchun Lan","doi":"10.1016/j.jelechem.2024.118815","DOIUrl":"10.1016/j.jelechem.2024.118815","url":null,"abstract":"<div><div>Metal-organic frameworks (MOFs) face challenges in electrochemical sensing due to low conductivity and poor stability. Herein, we report the synthesis of MOFs-derived metal/carbon composites (Au@Cu/Cu<sub>2</sub>O/C) that exhibit synergistic effects by combining metallic and carbonaceous characteristics due to their hierarchical structures and metal contents. The Au@Cu/Cu<sub>2</sub>O/C composites were characterized using electron microscopy, X-ray diffraction, Raman spectroscopy, and X-ray photoelectron spectroscopy. These composites inherit the exceptional properties of the pristine MOFs while exhibiting a large specific surface area, high electrical conductivity and stability. As an excellent electrode material, the Au@Cu/Cu<sub>2</sub>O/C composites were biofunctionalized with streptavidin and a biotinylated antibody for use as a highly sensitive, label-free electrochemical immunosensor for the detection of the tumor marker prostate specific antigen (PSA). The fabricated immunosensor successfully detected PSA concentrations ranging from 0.05 to 60 ng/mL, with a detection limit of 0.01 ng/mL, showcasing high sensitivity comparable to other existing methods. This research provides a versatile and promising platform for developing advanced biosensors for disease diagnostics and further expanding the application of MOFs.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"976 ","pages":"Article 118815"},"PeriodicalIF":4.1,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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