Electrochemistry Communications最新文献_第10页

3D-printed add-on allows using commercially available rotating disc electrodes in tilted position 3d打印附加组件允许在倾斜位置使用市售的旋转圆盘电极

IF 4.7 3区工程技术

Electrochemistry Communications Pub Date : 2025-01-01 DOI: 10.1016/j.elecom.2024.107854

Katharina Röhring, Falk Harnisch

{"title":"3D-printed add-on allows using commercially available rotating disc electrodes in tilted position","authors":"Katharina Röhring, Falk Harnisch","doi":"10.1016/j.elecom.2024.107854","DOIUrl":"10.1016/j.elecom.2024.107854","url":null,"abstract":"<div><div>Knowledge on reaction kinetics is essential for further understanding electrochemical reactions and the development of electrochemical processes. Different tools are available to study reaction kinetics of redox electrodes. One that is widely used is the rotating disk electrode (RDE). However, RDE has limitations when it comes to more complex electrochemical reactions, especially those involving gas evolution. Due to the facing downwards of the planar electrode surface evolving gas bubbles cannot escape by buoyance leading to temporarily and stochastically insultation. This limits using the RDE to low overpotentials or high rotation rates for these kind of reactions in order to prevent blockage of the electrode surface with gas bubbles. To overcome these limitations, we present a modification for commercially available RDE that is based on rapid prototyping using 3D-printing. This allows the RDE setup to be easily operated in a tilted position allowing the gas bubbles to escape from the electrode surface by buoyance. We validate the tilted RDE setup using the example of the well-studied redox pair ferro-/ferricyanide. This is achieved by calculating the diffusion coefficient for both redox species in straight and tilted position based on the Levich-equation. We show that the presented setup can be further used for more complex reactions.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"170 ","pages":"Article 107854"},"PeriodicalIF":4.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Titanium deoxidation mechanism probed using an electron beam melting method 用电子束熔化法探讨了钛的脱氧机理

IF 4.7 3区工程技术

Electrochemistry Communications Pub Date : 2025-01-01 DOI: 10.1016/j.elecom.2024.107856

Hyun chul Kim , Namhun Kwon , Jae-Hong Shin , Dong hyun Kim , Soong Ju Oh , Kyoung-Tae Park

{"title":"Titanium deoxidation mechanism probed using an electron beam melting method","authors":"Hyun chul Kim , Namhun Kwon , Jae-Hong Shin , Dong hyun Kim , Soong Ju Oh , Kyoung-Tae Park","doi":"10.1016/j.elecom.2024.107856","DOIUrl":"10.1016/j.elecom.2024.107856","url":null,"abstract":"<div><div>In this study, we examine the volatilization of oxygen in titanium under electron beam melting (EBM) conditions, correlating the beam output with oxygen content changes. The potential for titanium deoxidation through the application of electron beams remains a subject of ongoing debate. To verify this experimentally, the effects of electron beam processing on the oxygen contents of different titanium raw materials are quantified by nitrogen/oxygen analysis. Moreover, the mechanism of oxygen diffusion in titanium, which is affected by the positively charged surface layer generated by the electron beam, is evaluated by determining the corresponding activation energy using density functional theory (DFT) calculations. An average reduction of oxygen concentration by 50 % was observed following EBM. Residual gas analysis confirmed the evolution of oxygen gas over a duration of 10 min. Thermodynamic calculations indicate that deoxidation is feasible at temperatures exceeding 4,000 K in a vacuum of approximately 5 <span><math><mrow><mo>×</mo></mrow></math></span> 10<sup>−7</sup> Torr, thereby substantiating the potential for deoxidation. Furthermore, DFT calculations demonstrated that the oxygen diffusion coefficient increases proportionally with an increase in positive surface charge, thereby facilitating the removal of oxygen in an electron beam environment.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"170 ","pages":"Article 107856"},"PeriodicalIF":4.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design of precursors and pH factors for enhancing the performance of nickel-based catalysts for anion exchange membrane water electrolysis 提高阴离子交换膜电解镍基催化剂性能的前驱体和pH因子的设计

IF 4.7 3区工程技术

Electrochemistry Communications Pub Date : 2025-01-01 DOI: 10.1016/j.elecom.2024.107851

Eon-ju Park , Chiho Kim , Jooyoung Lee , Shin-Woo Myeong , Hoseok Lee , Sungjun Heo , Song Jin , Minjeong Park , Oi Lun Li , Sung Mook Choi

{"title":"Design of precursors and pH factors for enhancing the performance of nickel-based catalysts for anion exchange membrane water electrolysis","authors":"Eon-ju Park , Chiho Kim , Jooyoung Lee , Shin-Woo Myeong , Hoseok Lee , Sungjun Heo , Song Jin , Minjeong Park , Oi Lun Li , Sung Mook Choi","doi":"10.1016/j.elecom.2024.107851","DOIUrl":"10.1016/j.elecom.2024.107851","url":null,"abstract":"<div><div>In response to the escalating global energy crisis and climate change, green hydrogen is increasingly recognized as a clean energy solution. This study presents an innovative approach to enhance the performance of nickel-based catalysts for anion exchange membrane water electrolysis (AEMWE) through careful selection of precursor materials and pH optimization in the co-precipitation process. By optimizing precursor types and pH conditions during co-precipitation synthesis, we achieved high yields of Ni(OH)<sub>2</sub>, which were then thermally treated to form NiO. Notably, the nitrate-based NiO (N-NiO) exhibited superior catalytic activity and durability, attributed to its favorable microstructure and charge transfer capabilities. In addition, to verify universality of the N-NiO study and to assess the water electrolysis performance, we synthesized a binary compound, nickel–cobalt oxide (NCO), by incorporating Co, and evaluated its electrochemical performance in an AEMWE single-cell system. The nitrate-based NCO-based single-cell achieved a high current density of 1.38 A/cm<sup>2</sup> at 1.8 V<sub>cell</sub> in 1 M KOH at 50 °C, with a low degradation rate of 23 mV/kh at 1 A/cm<sup>2</sup> for 300 h. These findings provide valuable insights into the optimization of catalyst properties for hydrogen production and highlight significant commercial potential for hydrogen production and other electrochemical applications.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"170 ","pages":"Article 107851"},"PeriodicalIF":4.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamic study on the anodic dissolution of 304 stainless steel with elastic stress in sodium chloride solution 304不锈钢弹性应力在氯化钠溶液中阳极溶解的动态研究

IF 4.7 3区工程技术

Electrochemistry Communications Pub Date : 2025-01-01 DOI: 10.1016/j.elecom.2024.107847

Jiayue Zhou, Guangming Ding, Qincheng Li, Pengyu Yang, Yongyan Zhu

引用次数: 0

Visualization of lithiated/delithiated particle distribution in Li4Ti5O12 electrode by ultralow-voltage scanning electron microscopy imaging 超低电压扫描电镜成像显示Li4Ti5O12电极中锂化/稀薄颗粒分布

IF 4.7 3区工程技术

Electrochemistry Communications Pub Date : 2025-01-01 DOI: 10.1016/j.elecom.2024.107849

Mitsunori Kitta

{"title":"Visualization of lithiated/delithiated particle distribution in Li4Ti5O12 electrode by ultralow-voltage scanning electron microscopy imaging","authors":"Mitsunori Kitta","doi":"10.1016/j.elecom.2024.107849","DOIUrl":"10.1016/j.elecom.2024.107849","url":null,"abstract":"<div><div>Characterization of the spatial distribution of lithiated/delithiated particles in Li-ion battery electrodes would facilitate an understanding of the reactions taking place. Here, ultralow-voltage (<1 kV) accelerated scanning electron microscopy (ULV-SEM) was used to visualize the distribution of lithiated/delithiated particles in the Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> electrode. A conductive additive-free electrode was prepared using commercially available Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> powder and partially lithiated using an electrochemical cell. The secondary electron (SE) image of the partially lithiated electrode acquired at an acceleration volage of 500 V shows a clear distribution of the lithiated/delithiated secondary particles. The contrast of the high-angle backscattered electron (HA-BSE) image of the corresponding voltage is different from that of the SE mode, providing heterogeneous physical information on the secondary particles in the electrode, such as inhomogeneous surface electronic conductive pathway of each particle. With its facile and high-throughput screening, ULV-SEM imaging is a promising method for characterizing LIB electrodes and clarifying the reactions occurring.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"170 ","pages":"Article 107849"},"PeriodicalIF":4.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In situ synthesis of Mo-doped carbon-coated NiCo2S4 nanosheet networks for supercapacitors 超级电容器用掺杂mo碳包覆NiCo2S4纳米片网络的原位合成

IF 4.7 3区工程技术

Electrochemistry Communications Pub Date : 2025-01-01 DOI: 10.1016/j.elecom.2024.107853

Kaiyu Wang , Fan Zhou , Jiangnan Chu , Wenchong Ouyang , Kun Wang , Zhengwei Wu

{"title":"In situ synthesis of Mo-doped carbon-coated NiCo2S4 nanosheet networks for supercapacitors","authors":"Kaiyu Wang , Fan Zhou , Jiangnan Chu , Wenchong Ouyang , Kun Wang , Zhengwei Wu","doi":"10.1016/j.elecom.2024.107853","DOIUrl":"10.1016/j.elecom.2024.107853","url":null,"abstract":"<div><div>Supercapacitors offer numerous advantages, including high power output, quick charging and discharging rates, and stable cycling performance. Nevertheless, their energy density and cycle life still fall short of current industry demands for energy storage. To address these challenges, this work fabricated nanostructured electrodes by synthesizing molybdenum-doped carbon-coated NiCo<sub>2</sub>S<sub>4</sub> (C@NiCo<sub>2</sub>S<sub>4</sub>-Mo), using NiCo<sub>2</sub>S<sub>4</sub> as the precursor. The doping of molybdenum, a transition metal with many oxidation states, significantly improved the electronic structure and stability of the electrode material. Additionally, incorporating a carbon-coated structure enhanced the material’s stability during cycling, extending its operational lifespan. The results demonstrated that C@NiCo<sub>2</sub>S<sub>4</sub>-Mo exhibited exceptional electrochemical properties, featuring a defined capacitance of 931.75 Farad/g under the current flux of 1 A/g. This high specific capacitance value, a vital factor regarding capacitor performance, directly influences the energy storage capacity of the device, indicating the high potential of the C@NiCo<sub>2</sub>S<sub>4</sub>-Mo material for supercapacitors. It was observed that the particular capacity retention was 76.6 % when the current density was increased by a factor of 10. The substance also showed favorable pseudocapacitive characteristics, retaining 87.7 % of its particular capacitance after prolonged cycling in cyclic voltammetry (CV) tests, highlighting its outstanding cyclic stability. Furthermore, supercapacitors constructed from C@NiCo<sub>2</sub>S<sub>4</sub>-Mo achieved an energy density of 14.5 Wh/kg at a power density of 700 kW/kg, making them promising candidates for energy storage applications.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"170 ","pages":"Article 107853"},"PeriodicalIF":4.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

TiO2 nanotubes grown on Ti and Ti6Al4V alloy spheres by bipolar anodization 通过双极阳极氧化在Ti和Ti6Al4V合金球上生长TiO2纳米管

IF 4.7 3区工程技术

Electrochemistry Communications Pub Date : 2025-01-01 DOI: 10.1016/j.elecom.2024.107855

Marcela Sepúlveda , Hanna Sopha , Veronika Cicmancova , Ludek Hromadko , Jan M. Macak

{"title":"TiO2 nanotubes grown on Ti and Ti6Al4V alloy spheres by bipolar anodization","authors":"Marcela Sepúlveda , Hanna Sopha , Veronika Cicmancova , Ludek Hromadko , Jan M. Macak","doi":"10.1016/j.elecom.2024.107855","DOIUrl":"10.1016/j.elecom.2024.107855","url":null,"abstract":"<div><div>In this work, the anodization of spheres of Ti and Ti6Al4V alloy (TiAlV) in glycerol-based electrolytes using bipolar electrochemistry is shown for the first time. TiO<sub>2</sub> nanotube (TNT) layers were found over the entire surface area of the Ti and TiAlV spheres using a square wave potential of ±60 V and ±65 V with 5.56 × 10<sup>−4</sup> Hz. The TNTs’ inner diameter on the extremities of the Ti spheres was ∼63 nm and ∼78 nm, for ±60 V and ±65 V, respectively. The inner diameter of the TNTs fabricated on the TiAlV spheres was ∼36 nm and ∼43 nm for ±60 V and ±65 V, respectively. The effect of the alloying elements of the TiAlV spheres on the TNT layers was also investigated. To estimate the effective potential on the spheres contributing to the TNT layer formation, also the conventional anodization was performed on flat Ti and TiAlV foils for comparison. It was found that the effective potential reached on the extremities of the Ti and TiAlV spheres near the feeder electrodes was only 29 % and 16 % of the applied potential, respectively.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"170 ","pages":"Article 107855"},"PeriodicalIF":4.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancing the cycle stability of milled Mg-Ni alloys: The role of Pd substitution on reversible electrochemical hydrogenation/dehydrogenation reactions 提高铣削Mg-Ni合金的循环稳定性：Pd取代在可逆电化学加氢/脱氢反应中的作用

IF 4.7 3区工程技术

Electrochemistry Communications Pub Date : 2025-01-01 DOI: 10.1016/j.elecom.2024.107860

Jianling Huang , Jiabao Li , Yang Cai , Shiqian Zhao

{"title":"Enhancing the cycle stability of milled Mg-Ni alloys: The role of Pd substitution on reversible electrochemical hydrogenation/dehydrogenation reactions","authors":"Jianling Huang , Jiabao Li , Yang Cai , Shiqian Zhao","doi":"10.1016/j.elecom.2024.107860","DOIUrl":"10.1016/j.elecom.2024.107860","url":null,"abstract":"<div><div>The practical application of Mg-based alloys as anode materials for nickel-metal hydride (Ni-MH) batteries is hindered by serious capacity decay. To enhance their cycle stability and elucidate the underlying mechanism, this study investigates the influence of partially substituting Ni with Pd on the structural and electrochemical properties of milled Mg<sub>55</sub>Ni<sub>45</sub> alloy, as well as their microstructural evolution during cycling. This work demonstrates the Pd addition enables reversible electrochemical hydrogenation/dehydrogenation reactions in the Mg<sub>2</sub>Ni phase and enhances the electrochemical reaction kinetics of the alloys. As a result, the addition of Pd improves both cyclic performance and rate capability of the milled alloy electrodes. The Mg<sub>55</sub>Ni<sub>45</sub> alloy delivers a maximum discharge capacity of 488.65 mAh/g but decays to 110 mAh/g after only 13 cycles at a discharge current density of 50 mA/g. In contrast, the Mg<sub>55</sub>Pd<sub>4</sub>Ni<sub>41</sub> alloy demonstrates a discharge capacity of 564.6 mAh/g and retains 277 mAh/g after 50 cycles. Notably, when subjected to a higher discharge current density of 300 mA/g, the Mg<sub>55</sub>Pd<sub>4</sub>Ni<sub>41</sub> alloy displays an enhanced discharge capacity (401.49 mAh/g) compared to that of the Mg<sub>55</sub>Ni<sub>45</sub> alloy (77.72 mAh/g).</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"170 ","pages":"Article 107860"},"PeriodicalIF":4.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Linearly concentrating solution favors efficient and precise determination of critical pitting chloride concentration 线性浓缩溶液有利于有效和精确地测定临界蚀点氯化物浓度

IF 4.7 3区工程技术

Electrochemistry Communications Pub Date : 2025-01-01 DOI: 10.1016/j.elecom.2024.107859

Jia-Yi Gao, Yang Bai, Cheng-Ping Ye, Xian-Zong Wang

引用次数: 0

Design of anti-poisoning catalysts for hydrogen oxidation reaction in next-generation anion exchange membrane fuel cells 下一代阴离子交换膜燃料电池氢氧化反应抗中毒催化剂的设计

IF 4.7 3区工程技术

Electrochemistry Communications Pub Date : 2025-01-01 DOI: 10.1016/j.elecom.2024.107852

Jiho Min , Yunjin Kim , Seunghyun Lee , Keonwoo Ko , Sourabh S. Chougule , Abhishek A. Chavan , Khikmatulla Davletbaev , Beomjun Pak , Hyelim Park , Sung-Dae Yim , Namgee Jung

{"title":"Design of anti-poisoning catalysts for hydrogen oxidation reaction in next-generation anion exchange membrane fuel cells","authors":"Jiho Min , Yunjin Kim , Seunghyun Lee , Keonwoo Ko , Sourabh S. Chougule , Abhishek A. Chavan , Khikmatulla Davletbaev , Beomjun Pak , Hyelim Park , Sung-Dae Yim , Namgee Jung","doi":"10.1016/j.elecom.2024.107852","DOIUrl":"10.1016/j.elecom.2024.107852","url":null,"abstract":"<div><div>Extensive research has been conducted on hydrocarbon-based ionomers and membranes with high ionic conductivity and chemical stability for next-generation anion exchange membrane fuel cells (AEMFCs). However, it is well known that the benzene groups of hydrocarbon-based ionomers seriously poison the active sites of Pt catalysts, thereby reducing hydrogen oxidation reaction (HOR) activity and AEMFC performance. Over the past years, the development of benzene-tolerant catalysts has mainly focused on metal alloy nanoparticles such as PtRu, without pursuing the design of breakthrough catalyst structures that can more effectively reduce benzene poisoning. Here, we introduce an anti-poisoning catalyst structure promoted by the synergistic effect of carbon shell encapsulation and metal alloying. The porous carbon shell encapsulating the metal nanoparticles is expected to prevent direct adsorption of benzene groups, while the alloying of Pt and Ru can reduce the benzene adsorption energy itself. Comparative electrochemical analysis results confirm that the carbon shell-encapsulated metal alloy catalyst significantly alleviate benzene poisoning, exhibiting superior HOR activity than the conventional alloys in benzyltrimethylammonium hydroxide (BTMAOH) solution.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"170 ","pages":"Article 107852"},"PeriodicalIF":4.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0