Electrochemistry Communications最新文献_第4页

Combined effects of electrode geometry and airflow streamlines patterns on ozone production of a cylindrical dielectric barrier discharge

IF 4.7 3区工程技术

Electrochemistry Communications Pub Date : 2025-01-22 DOI: 10.1016/j.elecom.2025.107873

Jan Mikeš, Stanislav Pekárek, Ondřej Hanuš

引用次数: 0

Effects of Ba dopant on the structural, microstructural, and electrochemical properties of NCM811 cathode material (BaxLi1−xNi0.8Co0.1Mn0.1O2) for Li-ion storage

IF 4.7 3区工程技术

Electrochemistry Communications Pub Date : 2025-01-22 DOI: 10.1016/j.elecom.2025.107878

K. Goharshadi , S.M. Masoudpanah , H. Nasrinpour , M. Namayandeh Jorabchi

{"title":"Effects of Ba dopant on the structural, microstructural, and electrochemical properties of NCM811 cathode material (BaxLi1−xNi0.8Co0.1Mn0.1O2) for Li-ion storage","authors":"K. Goharshadi , S.M. Masoudpanah , H. Nasrinpour , M. Namayandeh Jorabchi","doi":"10.1016/j.elecom.2025.107878","DOIUrl":"10.1016/j.elecom.2025.107878","url":null,"abstract":"<div><div>The Ba-doped NCM 811 cathode material (Ba<sub>x</sub>Li<sub>1-x</sub>Ni<sub>0.8</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>O<sub>2</sub> (x = 0, 0.015, 0.03, 0.05)) was prepared by a facile chemical synthesis method. The structural, microstructural, and electrochemical properties were studied as a function of Ba content by X-ray diffractometry, X-ray photoelectron spectroscopy, scanning electron microscopy, galvanic charge/discharge, and electrochemical impedance spectroscopy (EIS) techniques. Single-phase NCM powders with the layered crystal structure were crystallized irrespective of the amount of Ba dopant. The unit cell volume expanded from 100.606 to 101.962 Å<sup>3</sup> by adding the Ba cations. Furthermore, the particle size increased from 0.40 to 0.49 μm by increasing the Ba dopant up to 5 %. The Ba<sub>0.03</sub>Li<sub>0.97</sub>Ni<sub>0.8</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>O<sub>2</sub> material had the highest discharge specific capacity of 185 mA h g<sup>‐1</sup> at a current rate of 0.1C and a high capacity retention of 99.8 % after 500 charge/discharge cycling at 1C. By adding the Ba cations, the diffusion coefficient calculated from EIS increased from 3.31 × 10<sup>−14</sup> to 7.71 × 10<sup>−14</sup> cm<sup>2</sup> s<sup>−1</sup> due to the expansion of the lattice structure.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"172 ","pages":"Article 107878"},"PeriodicalIF":4.7,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143098120","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

Comparative studies of recent advances in quantum dots nanocomposites for supercapacitor electrodes

IF 4.7 3区工程技术

Electrochemistry Communications Pub Date : 2025-01-20 DOI: 10.1016/j.elecom.2025.107874

Ghobad Behzadi Pour , Leila Fekri Aval

{"title":"Comparative studies of recent advances in quantum dots nanocomposites for supercapacitor electrodes","authors":"Ghobad Behzadi Pour , Leila Fekri Aval","doi":"10.1016/j.elecom.2025.107874","DOIUrl":"10.1016/j.elecom.2025.107874","url":null,"abstract":"<div><div>Novel material innovation is a driving force for advancing high-performance electrochemical energy storage technologies. Quantum dots (QDs), over the last decade, have exhibited immense potential in applications related to bioimaging, optoelectronics, catalysis, and energy storage, together with a remarkable rise in greener synthesis methods. Carbon nanomaterials, particularly carbon quantum dots (CQDs) and graphene quantum dots (GQDs), have garnered significant interest due to their exceptional characteristics, including high electrical conductivity, thermal stability, mechanical robustness, chemical durability, photoluminescence, affordability, and ease of surface modification. CQDs show promise for supercapacitors due to their unique properties but face challenges like limited surface area. Improving CQD synthesis and purification is crucial for enhancing supercapacitor performance. GQDs are praised for their conductive networks and surface properties, but more research is needed on industrial-scale synthesis. This review reported the recent advances in the electrochemical characteristics and synthesis of various QDs in supercapacitor electrodes.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"172 ","pages":"Article 107874"},"PeriodicalIF":4.7,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102660","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

Electrochemical modification and analytical exploration of resazurin as a redox-active probe for electrochemical biosensors

IF 4.7 3区工程技术

Electrochemistry Communications Pub Date : 2025-01-01 DOI: 10.1016/j.elecom.2024.107848

Balamurugan Thangavel , Won Han , Joong Ho Shin

{"title":"Electrochemical modification and analytical exploration of resazurin as a redox-active probe for electrochemical biosensors","authors":"Balamurugan Thangavel , Won Han , Joong Ho Shin","doi":"10.1016/j.elecom.2024.107848","DOIUrl":"10.1016/j.elecom.2024.107848","url":null,"abstract":"<div><div>An electrochemical potential-assisted functionalization strategy is used to immobilize resazurin (AZ) on multiwalled carbon nanotube surfaces in a physiological buffer leading to the formation of a resorufin/dihydro resorufin (RR/DRR) redox couple. The electrochemical characterizations that reveal the modified surface are surface-confined behavior with an electron transfer rate constant of 4.4 s<sup>−1</sup>. Thus modified RR/DRR redox couple was found to modulate the interfacial characteristics to the benefits of bio-electrocatalysis since the redox molecule has sensitivity to pH, negative redox potential, and selectivity to analytes. The hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) reduction and sensing performance of the AZ-modified electrode surface were evaluated. The experimental results revealed the direct detection of high concentrations of H<sub>2</sub>O<sub>2</sub> at the electrified interface before the oxygen reduction potential. Furthermore, the designed sensor exhibited high selectivity for H<sub>2</sub>O<sub>2</sub> even in the presence of interfering molecules in the solution. In addition, for the demonstration, the <em>glucose oxidase</em> enzymes were immobilized on carbon nanotubes modified with an RR/DRR redox couple, and the electron tunneling behavior was investigated. The developed sensor could be used for the reagent-less electrochemical biosensing of glucose up to 30 mM. Thus, the AZ-based redox electrode catalysts can be applied in diverse biosensor applications.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"170 ","pages":"Article 107848"},"PeriodicalIF":4.7,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143133003","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

Electro-isolation of galvanic current

IF 4.7 3区工程技术

Electrochemistry Communications Pub Date : 2025-01-01 DOI: 10.1016/j.elecom.2024.107850

Guang-Ling Song , Xinran Yao

引用次数: 0

3D-printed add-on allows using commercially available rotating disc electrodes in tilted position

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

Design of precursors and pH factors for enhancing the performance of nickel-based catalysts for anion exchange membrane water electrolysis

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

Titanium deoxidation mechanism probed using an electron beam melting method

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

Dynamic study on the anodic dissolution of 304 stainless steel with elastic stress in sodium chloride solution

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

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