Electrochimica Acta最新文献_第10页

Enhanced performance of diamond electrodes with heavily N-doped surface nanolayers grown by CVD for high reduction current density

IF 5.5 3区材料科学

Electrochimica Acta Pub Date : 2025-03-16 DOI: 10.1016/j.electacta.2025.146058

Taro Yoshikawa , Akira Kaga , Kimiyoshi Ichikawa , Kan Hayashi , Tsubasa Matsumoto , Ryosuke Izumi , Mitsuru Ohno , Satoshi Yamasaki , Norio Tokuda , Hitoshi Asakawa

{"title":"Enhanced performance of diamond electrodes with heavily N-doped surface nanolayers grown by CVD for high reduction current density","authors":"Taro Yoshikawa , Akira Kaga , Kimiyoshi Ichikawa , Kan Hayashi , Tsubasa Matsumoto , Ryosuke Izumi , Mitsuru Ohno , Satoshi Yamasaki , Norio Tokuda , Hitoshi Asakawa","doi":"10.1016/j.electacta.2025.146058","DOIUrl":"10.1016/j.electacta.2025.146058","url":null,"abstract":"<div><div>The diamond electrode with a heavily N-doped surface nanolayer has the potential to revolutionize not only the production of CO from CO<sub>2</sub> reduction, but also the production of various chemicals using reduction reactions. However, the current density attributed to the reduction reaction remains insufficient for industrial requirements. In this study, we investigated the fundamental electrochemical behavior of diamond electrodes with heavily N-doped surface nanolayers through polarization curve measurements for hydrogen evolution reaction in the dark and upon visible-light irradiation. Two types of layers, a chemical vapor deposition (CVD)-processed diamond layer containing detonation-synthesized nanodiamonds (DNDs) and a heavily N-doped CVD-processed diamond (NDD) layer without DNDs, were used as heavily N-doped surface nanolayers and compared mainly in terms of the electron transfer coefficient and visible-light responsiveness. Electron transfer at the electrode surface for the DND-based layer was limited, whereas it was unrestricted for the NDD layer; however, the current density was suppressed in the larger negative-current-density region. Moreover, the NDD layer enabled a more effective conversion of visible-light energy to the photovoltaic effect than the DND-based layer. These results suggest that the electrode surface is better capped by less-defective diamond crystals, whereas the N-doped layer has sufficient conductivity to enable a larger reduction current density. Such a diamond electrode could revolutionize the research and development in the field of diamond green chemistry.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"525 ","pages":"Article 146058"},"PeriodicalIF":5.5,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Surface engineering for high voltage LiCoO2 in halide all-solid-state lithium-ion batteries 卤化物全固态锂离子电池中高压钴酸锂的表面工程

IF 5.5 3区材料科学

Electrochimica Acta Pub Date : 2025-03-16 DOI: 10.1016/j.electacta.2025.146052

Xinran Zhang , Yali Liu , Dongxiao Wang , Jing Wang , Tu Lan , Bingkun Guo , Shigang Lu , Yingchun Lyu

{"title":"Surface engineering for high voltage LiCoO2 in halide all-solid-state lithium-ion batteries","authors":"Xinran Zhang , Yali Liu , Dongxiao Wang , Jing Wang , Tu Lan , Bingkun Guo , Shigang Lu , Yingchun Lyu","doi":"10.1016/j.electacta.2025.146052","DOIUrl":"10.1016/j.electacta.2025.146052","url":null,"abstract":"<div><div>All-solid-state lithium-ion batteries (ASSLIBs) have obtained more and more attention due to their inherent safety and high energy density. Halide solid electrolytes are one of the ideal candidates for ASSLIBs due to their high ionic conductivity, wide electrochemical window, and outstanding compatibility with oxide cathode materials. However, the contact interface issues between the oxide cathode and halide electrolyte and undesirable side-reaction under high voltage remain to be solved. Herein, we report an approach to stabilize the interface between high-voltage LiCoO<sub>2</sub> and Li<sub>3</sub>InCl<sub>6</sub> solid electrolyte with a nanostructured Li<sub>2</sub>SiO<sub>3</sub> coating using a simple sol-gel method. The Li<sub>2</sub>SiO<sub>3</sub> coating layer with a similar layered structure to the LiCoO<sub>2</sub> shows an impressive ion conductivity. The uniform Li<sub>2</sub>SiO<sub>3</sub> buffer layer between LiCoO<sub>2</sub> and Li<sub>3</sub>InCl<sub>6</sub> suppresses the irreversible structural transition of the cathode active material and avoids interfacial by-product from the side-reaction at high voltage. Encouragingly, ASSLIBs with the Li<sub>2</sub>SiO<sub>3</sub> coated LiCoO<sub>2</sub> displayed a high reversible discharge capacity of 193.4 mAh g<sup>−1</sup> and a superior capacity retention of 81 % after 250 cycles at 4.6 V.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"524 ","pages":"Article 146052"},"PeriodicalIF":5.5,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Facile electrochemical fabrication of PEDOT/hydrated tungsten oxides/W self-supporting electrodes with high performance for supercapacitors

IF 5.5 3区材料科学

Electrochimica Acta Pub Date : 2025-03-15 DOI: 10.1016/j.electacta.2025.146056

Zhen-Hao Wang, Jun-Hao Gong, Jin-Chen Zhou, Shi-Zhao Wu, Chen-Yao Wei, Yu-Yan Liang, Yu-Meng Chen, Guo-Hua Li, Mei-Qin Shi, Jing Gao

{"title":"Facile electrochemical fabrication of PEDOT/hydrated tungsten oxides/W self-supporting electrodes with high performance for supercapacitors","authors":"Zhen-Hao Wang, Jun-Hao Gong, Jin-Chen Zhou, Shi-Zhao Wu, Chen-Yao Wei, Yu-Yan Liang, Yu-Meng Chen, Guo-Hua Li, Mei-Qin Shi, Jing Gao","doi":"10.1016/j.electacta.2025.146056","DOIUrl":"10.1016/j.electacta.2025.146056","url":null,"abstract":"<div><div>Tungsten oxide hydrates, as an emerging type of electrode materials, have excellent pseudocapacitive activity but low conductivity. Making composites with conductive polymers is a promising way to overcome this disadvantage and thus improves their capacitive performance. However, little research on this topic has been reported so far. Herein, a series of PEDOT/WO<sub>3</sub>⋅<em>x</em>H<sub>2</sub>O/W (denoted as PWHW, <em>x</em> = 1 or 2) self-supporting electrodes have been facilely prepared via a two-step electrochemical method, <em>i.e.</em>, anodic oxidation of W followed by electropolymerization of 3, 4-ethylenedioxythiophene (EDOT). Importantly, the electropolymerization of EDOT brought about highly porous network structure and enhanced cycling stability to the PWHW electrodes. The porous network structure together with the high conductivity of PEDOT made the interfacial charge transfer resistance of the PWHW electrodes drastically decrease compared to that of the WO<sub>3</sub>⋅<em>x</em>H<sub>2</sub>O/W electrode (denoted as WHW). As a result, the as-prepared PWHW-200 showed a high areal capacitance (251.4 mF cm<sup>−2</sup>), high volumetric capacitance (723.8 F cm<sup>−3</sup>) and long cycling life (a capacity retention of 107 % after 10,000 cycles). What is more, an asymmetrical supercapacitor with PWHW-200 as the negative electrode could deliver a high energy density of 7.09 mW h cm<sup>−2</sup> at a power density of 20.41 mW cm<sup>−2</sup>. These findings can promote the development of fabricating new inorganic-organic composites as self-supporting electrodes with high performance for energy storage devices.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"524 ","pages":"Article 146056"},"PeriodicalIF":5.5,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143627755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A portable gold microneedle electrochemical sensor for real-time detection of p-benzoquinone in electrolysis process

IF 5.5 3区材料科学

Electrochimica Acta Pub Date : 2025-03-15 DOI: 10.1016/j.electacta.2025.146050

Fengming Zhao, Huadong Hu, Lili Zhao, Hui Yan, Huihui Zhou, Yinghong Zhu, Youqun Chu

{"title":"A portable gold microneedle electrochemical sensor for real-time detection of p-benzoquinone in electrolysis process","authors":"Fengming Zhao, Huadong Hu, Lili Zhao, Hui Yan, Huihui Zhou, Yinghong Zhu, Youqun Chu","doi":"10.1016/j.electacta.2025.146050","DOIUrl":"10.1016/j.electacta.2025.146050","url":null,"abstract":"<div><div>A real-time p-benzoquinone (PBQ) sensor with simplified fabrication was developed and integrated with organic electrosynthesis for in situ detection during electrochemical production. The portable microneedle sensor was constructed using a self-supporting nanoporous gold wire substrate, fabricated through a two-step process: anodization under fluoride ion modulation, and followed by chemical reducing in a mixed solution of ascorbic acid and SnCl<sub>2</sub>. The introduction of fluoride ions during the anodization significantly enhanced the electrochemical detection performance (83 % PBQ reduction property improvement), attributed to their strong coordination capability in pore structure engineering. The sensor's detection range (5.56 μM-1.53 mM) was designed to encompass both initial and terminal PBQ concentrations in typical production processes. Comparative validation with HPLC demonstrated a measurement accuracy of ±3.9 %, maintaining precision in both blank matrices and complex reaction mixtures containing additives. Key performance metrics included 1.0 second response time and sustained operational stability over 7 continuous days (<5 % signal attenuation). The device exhibited exceptional selectivity against common coexisting species: phenol (99 % recovery), resorcinol (92.8 %), catechol (CT, 94.8 %), hydroquinone (HQ, 98.9 %), maleic acid (MH, 91.6 %), and oxalic acid (OA, 90.4 %). This methodology establishes a prototype for adaptive chemical monitoring platforms, demonstrating significant potential for real-time process analytics in diverse electrochemical synthesis applications.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"524 ","pages":"Article 146050"},"PeriodicalIF":5.5,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Artificial Solid Electrolyte Interphases Stabilized Zn Metal Anodes for High-Rate and Long-Lifespan Aqueous Batteries

IF 5.5 3区材料科学

Electrochimica Acta Pub Date : 2025-03-15 DOI: 10.1016/j.electacta.2025.146053

Xinyu Lv , Xin Gu , Ren Tian , Hubiao Pan , Xinyu Chen , Jian Yang , Dandan Liu , Mingbo Wu

{"title":"Artificial Solid Electrolyte Interphases Stabilized Zn Metal Anodes for High-Rate and Long-Lifespan Aqueous Batteries","authors":"Xinyu Lv , Xin Gu , Ren Tian , Hubiao Pan , Xinyu Chen , Jian Yang , Dandan Liu , Mingbo Wu","doi":"10.1016/j.electacta.2025.146053","DOIUrl":"10.1016/j.electacta.2025.146053","url":null,"abstract":"<div><div>The practical application of aqueous Zn-metal batteries (AZMBs) faces challenges primarily due to uncontrolled growth of zinc dendrites and harmful parasitic reactions caused by water at the Zn-electrolyte interface. To address these issues, a multifunctional interface using indium oxide (In<sub>2</sub>O<sub>3</sub>) with strong zincophilic and hydrophilic properties has been designed through atomic layer deposition to enable dendrite-free Zn deposition. Experimental and theoretical findings reveal that a highly zincophilic surface with excellent Zn<sup>2+</sup> adsorption forms with the In<sub>2</sub>O<sub>3</sub> layer. This significantly reduces the nucleation overpotential and promotes a more uniform Zn<sup>2+</sup> flux during the electroplating growth. Additionally, the wide band gap of In<sub>2</sub>O<sub>3</sub> effectively prevents electron transfer between the interfacial layers, while its corrosion resistance helps to inhibit hydrogen evolution and side reactions. Notably, the In<sub>2</sub>O<sub>3</sub>@Zn symmetric battery demonstrates an impressive cycle life of over 2800 h, surpassing other interphase modification strategies that utilize different inorganic compounds. The In<sub>2</sub>O<sub>3</sub>@Zn||NVO full cell reaches a 93 % capacity retention over 1500 cycles at 4 A g<sup>−1</sup>. Using In<sub>2</sub>O<sub>3</sub> as an artificial solid electrolyte interphase on Zn anodes offers a viable approach for developing dendrite-free Zn anodes and enhancing the electrochemical performance of AZMBs.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"524 ","pages":"Article 146053"},"PeriodicalIF":5.5,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dual-functional electrochromic green glass incorporated with PEDOT:PSS /electrochemically exfoliated graphene and cesium tungsten oxide for transmittance modulation and near infrared shielding

IF 5.5 3区材料科学

Electrochimica Acta Pub Date : 2025-03-15 DOI: 10.1016/j.electacta.2025.146055

Lung-Hao Hu , Kai-Sheng Hsiao , Chun-Ta Wang

{"title":"Dual-functional electrochromic green glass incorporated with PEDOT:PSS /electrochemically exfoliated graphene and cesium tungsten oxide for transmittance modulation and near infrared shielding","authors":"Lung-Hao Hu , Kai-Sheng Hsiao , Chun-Ta Wang","doi":"10.1016/j.electacta.2025.146055","DOIUrl":"10.1016/j.electacta.2025.146055","url":null,"abstract":"<div><div>The components of this dual-functional electrochromic green glass primarily consist of a five-layer structure, which includes two transparent conducting layers, composed of a composite polymer coating (PEDOT:PSS/elctrochemically exfoliated graphene, /cesium tungsten oxide); the electrochromic layer is made up of pussian blue, which belongs to anodic electrochromic materials, and PEDOT:PSS, which itself is a cathodic electrochromic material; separated by a liquid electrolyte layer composed of propylene carbonate /lithium perchlorate, forming an electrochromic device with complementary colors. The coloration efficiency of the device can reach 435.04 cm²C⁻¹, with coloration and bleaching response times of 1.7 s and 0.7 s, respectively. In the near-infrared light range, the electrochromic device combined with a 1wt% cesium tungsten oxide coating can continuously block up to 77.4 % of infrared light transmission, effectively isolating heat radiation outside. In thermal insulation tests, the room temperature with the transparent conducting layer doped with cesium tungsten oxide is about 4 °C lower compared to ordinary glass, indicating a good indoor cooling function. After testing, the device doped with cesium tungsten oxide significantly expands the temperature difference between the colored and bleached states from 4.5 °C to 24.7 °C.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"524 ","pages":"Article 146055"},"PeriodicalIF":5.5,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143627751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Accelerated lithium ion interchange and enhanced electrochemical performance of lithium vanadium phosphate cathodes by Cr3+ doping

IF 5.5 3区材料科学

Electrochimica Acta Pub Date : 2025-03-15 DOI: 10.1016/j.electacta.2025.146054

Kexin Zhang , Yehang Dou , Qihang Wang , Jianquan Liang , Changsong Dai , Hua Huo

{"title":"Accelerated lithium ion interchange and enhanced electrochemical performance of lithium vanadium phosphate cathodes by Cr3+ doping","authors":"Kexin Zhang , Yehang Dou , Qihang Wang , Jianquan Liang , Changsong Dai , Hua Huo","doi":"10.1016/j.electacta.2025.146054","DOIUrl":"10.1016/j.electacta.2025.146054","url":null,"abstract":"<div><div>Ion doping is often employed as an effective method to enhance the electrochemical performance of monoclinic lithium vanadium phosphate Li<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> (LVP) cathode material. However, the functional mechanism of ion doping in LVP cathode has not been fully understood yet. Considering that Cr<sup>3+</sup> is adjacent to V<sup>3+</sup> on the periodic table and differs by only one unpaired d-electron, Cr<sup>3+</sup> was selected as the dopant to investigate its function in doped LVP. A series of Li<sub>3</sub>Cr<sub>x</sub>V<sub>(2-x)</sub>(PO<sub>4</sub>)<sub>3</sub>/C (LCr<sub>x</sub>VP/C) samples were synthesized by a sol-gel route. XRD results indicate that the crystalline structure of LVP remained unchanged, while the reduction in ionic radius led to a decrease in unit cell parameters. The substitution of V<sup>3+</sup> by Cr<sup>3+</sup> in LVP resulted in broaden and shifted peaks around 150–180 ppm in <sup>7</sup>Li NMR spectra, corresponding to Li sites surrounded by 4–5 Cr<sup>3+</sup> ions with rapid Li-Li interchange. After 500 cycles at 2C rate within the voltage range of 3.0–4.3 V, the optimal sample LCr<sub>0.1</sub>VP/C maintained a capacity of 111.9 mAh/g, with a capacity retention rate of 99.8%. After 500 cycles at 1C in the 3.0–4.8 V range, LCr<sub>0.05</sub>VP/C had a capacity of 104.1 mAh/g, with a capacity retention rate of 83.8%. Cr<sup>3+</sup> dopant promotes the rapid interchange among lithium ions at different sites, which accelerates the lithium ion extraction process within the LVP lattice.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"524 ","pages":"Article 146054"},"PeriodicalIF":5.5,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143627752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In-situ construction of Fe nanoparticles modified host materials for all-solid-state lithium-sulfur batteries with enhanced kinetic performance

IF 5.5 3区材料科学

Electrochimica Acta Pub Date : 2025-03-14 DOI: 10.1016/j.electacta.2025.146051

Fei Qian , Liuyi Hu , Yonggen Jin , Linhe Li , Ruyi Fang , Jun Zhang , Xinping He , Yongping Gan , Yang Xia , Xinhui Xia , Wenkui Zhang , Hui Huang

{"title":"In-situ construction of Fe nanoparticles modified host materials for all-solid-state lithium-sulfur batteries with enhanced kinetic performance","authors":"Fei Qian , Liuyi Hu , Yonggen Jin , Linhe Li , Ruyi Fang , Jun Zhang , Xinping He , Yongping Gan , Yang Xia , Xinhui Xia , Wenkui Zhang , Hui Huang","doi":"10.1016/j.electacta.2025.146051","DOIUrl":"10.1016/j.electacta.2025.146051","url":null,"abstract":"<div><div>All-solid-state lithium-sulfur batteries (ASSLSBs) with high theoretical energy have attracted much attention benefiting from fundamentally addressing the adverse shuttling effect. However, the development of stably operated ASSLSBs remains a great challenge due to the low conductivity and utilization of sulfur. Inspired by the polar single-atom catalyst with 100 % theoretical atomic utilization, a simple and effective strategy is proposed to improve the electrochemical performance of ASSLSBs by introducing Fe nanoparticles into the carbon host material (Ketjen black, KB). The in-situ grown Fe nanoparticles not only enhance the conductivity of the host material, but also promotes the conversion reaction of sulfur, resulting in the improvement of sulfur utilization and redox kinetics. Therefore, the initial discharge capacity of the assembled Fe-KB/S cell reaches 976 mA h g<sup>−1</sup> at 50 mA g<sup>−1</sup>, which is significantly higher than that of the KB/S cell (727 mA h g<sup>−1</sup>). Moreover, the Fe-KB/S cell maintains a reversible specific capacity of 520 mA h g<sup>−1</sup> after 150 cycles, which is almost twice that of the KB/S cell. This study provides a valuable reference for the further development of ASSLSBs.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"524 ","pages":"Article 146051"},"PeriodicalIF":5.5,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143627753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

De Novo monolayer graphene oxide high-yield synthesis and Rietveld analysis for advanced energy storage applications

IF 5.5 3区材料科学

Electrochimica Acta Pub Date : 2025-03-14 DOI: 10.1016/j.electacta.2025.145976

Shruti Rialach , Sanjeev Gautam , Navdeep Goyal , Surinder Paul

{"title":"De Novo monolayer graphene oxide high-yield synthesis and Rietveld analysis for advanced energy storage applications","authors":"Shruti Rialach , Sanjeev Gautam , Navdeep Goyal , Surinder Paul","doi":"10.1016/j.electacta.2025.145976","DOIUrl":"10.1016/j.electacta.2025.145976","url":null,"abstract":"<div><div>Graphene oxide (GO) is a two-dimensional carbon material with a single-layered structure derived from graphene, ideal for efficient charge transfer in energy storage applications. This research presents a novel streamlined Hummers’ method for high-yield synthesis of monolayer GO sheets via low-temperature isopycnic centrifugation. GO sheets were heat treated (60<span><math><msup><mrow></mrow><mrow><mo>∘</mo></mrow></msup></math></span>, 90<span><math><msup><mrow></mrow><mrow><mo>∘</mo></mrow></msup></math></span> and 120<span><math><msup><mrow></mrow><mrow><mo>∘</mo></mrow></msup></math></span>) for varying durations (12 h, 16 h, and 20 h) and characterized by X-ray diffractometer to select purely monolayer samples, GO-12 and GO-22 (stacking height<span><math><mo>≃</mo></math></span> 3.87 nm and 3.51 nm, respectively). The Rietveld analysis further confirmed that the hexagonal GO lattice corresponds to <em>‘P6mm’</em> space group. High-resolution transmission electron microscopy corroborated the micromorphology of purely isolated monolayer GO sheets and quantified the interplanar spacing. Micro-Raman spectroscopy corroborated the extent of graphitic domain disruption, as evidenced by the I<span><math><msub><mrow></mrow><mrow><mi>D</mi></mrow></msub></math></span>/I<span><math><msub><mrow></mrow><mrow><mi>G</mi></mrow></msub></math></span> ratio of 0.87. Electrochemical investigations using cyclic voltammetry, galvanostatic charging/discharging, and electrochemical impedance spectroscopy demonstrated maximum specific capacitance of 1688.43 F g<sup>−1</sup> for GO-22 at 10 mV s<sup>−1</sup> with an energy density of 540.96 W h kg<sup>−1</sup> at a power density of 4.00 kW kg<sup>−1</sup>, with capacitance retention of 92.16% after 10,000 cycles. This efficient method produces high-quality monolayer GO sheets, reducing costs, enhancing scalability, and supporting broader market adoption for advanced energy storage applications.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"524 ","pages":"Article 145976"},"PeriodicalIF":5.5,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143618515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Intensification of peroxone production through the paired generation of hydrogen peroxide and ozone in a continuous flow electrochemical reactor

IF 5.5 3区材料科学

Electrochimica Acta Pub Date : 2025-03-13 DOI: 10.1016/j.electacta.2025.146049

Isabela Matos Gaudio de Souza , Ismael F. Mena , Angela Moratalla , Cristina Sáez , Larissa Pinheiro de Souza , Antonio Carlos Silva Costa Teixeira , Manuel A. Rodrigo

{"title":"Intensification of peroxone production through the paired generation of hydrogen peroxide and ozone in a continuous flow electrochemical reactor","authors":"Isabela Matos Gaudio de Souza , Ismael F. Mena , Angela Moratalla , Cristina Sáez , Larissa Pinheiro de Souza , Antonio Carlos Silva Costa Teixeira , Manuel A. Rodrigo","doi":"10.1016/j.electacta.2025.146049","DOIUrl":"10.1016/j.electacta.2025.146049","url":null,"abstract":"<div><div>The paired electrochemical production of ozone and hydrogen peroxide is evaluated in a novel 3-D printed electrochemical cell in which the oxidants produced are tested in the removal of fluoxetine hydrochloride (FLX). To properly pair the anodic production of ozone and the cathodic production of hydrogen peroxide in the same cell, that is, with the same intensity in anode and cathode, an innovative composite 3-D gas diffusion cathode was used to decrease the current density (by increasing the effective cathode surface area) in the cathodic compartment, attaining soft operation conditions in this compartment. Meanwhile, a grid DIACHEM® lattice BDD was used in the anode to increase the harsh oxidative conditions in the anodic compartment. The results confirm the viability of pairing both processes. Current intensity positively affects the production of ozone and, less importantly, the production of hydrogen peroxide (because the current efficiency decreases with the intensity), with the contribution of electrolytes containing sulfate and bicarbonates being evaluated in the search of greener processes. The oxidants produced were dosed to solutions containing FLX confirming that the addition of both products (electro-peroxone process) attains a significant improvement in the removal of FLX, which was explained in terms of promoting radical mechanisms for ozone oxidation (peroxone reagent).</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"524 ","pages":"Article 146049"},"PeriodicalIF":5.5,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143608556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0