Effect of Ni–Ru/CF electrode fabrication and wettability modification on hydrogen evolution reaction and bubble evolution behavior during water electrolysis

IF 8.3 2区 工程技术 Q1 CHEMISTRY, PHYSICAL
Yao Yao, Xiajing Chen, Mengyun Shi, Yu Qiu, Dongling Wu, Hongjie Yan, Liu Liu
{"title":"Effect of Ni–Ru/CF electrode fabrication and wettability modification on hydrogen evolution reaction and bubble evolution behavior during water electrolysis","authors":"Yao Yao,&nbsp;Xiajing Chen,&nbsp;Mengyun Shi,&nbsp;Yu Qiu,&nbsp;Dongling Wu,&nbsp;Hongjie Yan,&nbsp;Liu Liu","doi":"10.1016/j.ijhydene.2025.151758","DOIUrl":null,"url":null,"abstract":"<div><div>Alkaline water electrolysis has attracted extensive attention, but its low energy conversion efficiency remains one of the key challenges hindering its industrialization. In this study, Ni–Ru/CF catalyst electrodes were fabricated via electrodeposition, with key parameters including <span><math><msup><mrow><mi>Ru</mi></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span> concentration in the deposition solution, deposition potential, and deposition time systematically optimized. The surface wettability of the electrodes was regulated by polytetrafluoroethylene (PTFE) solution impregnation, and the correlation mechanism between bubble evolution behavior and hydrogen evolution reaction (HER) efficiency on electrodes with different wettabilities was analyzed by combining high-speed imaging technology. Results show that the Ni–Ru/CF electrode fabricated under optimized deposition conditions (<span><math><msup><mrow><mi>Ru</mi></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span> concentration of 0.02 M, deposition potential of <span><math><mrow><mo>−</mo><mn>1</mn><mo>.</mo><mn>0</mn></mrow></math></span> V, and deposition time of 180 s) exhibits excellent HER performance, which is an overpotential of <span><math><mrow><mo>−</mo><mn>39</mn><mo>.</mo><mn>75</mn></mrow></math></span> mV at a current density of <span><math><mrow><mo>−</mo><mn>10</mn><mspace></mspace><mtext>mA</mtext><mspace></mspace><msup><mrow><mtext>cm</mtext></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></mrow></math></span>, a Tafel slope of 44.16 mV/dec, an electrochemical active surface area (ECSA) of 790 <span><math><mrow><mtext>cm</mtext><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup><mspace></mspace><msup><mrow><mtext>cm</mtext></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></mrow></math></span>, and a charge transfer resistance (<span><math><msub><mrow><mi>R</mi></mrow><mrow><mi>ct</mi></mrow></msub></math></span>) of 2.19 <span><math><mi>Ω</mi></math></span>. The hierarchical structure of nanoparticles and nanoflowers significantly enhances the exposure of active sites, providing structural support for efficient HER. PTFE modification reveals the key influence of wettability on bubble behavior. As the PTFE concentration increases (0-0.25 wt%), the electrode hydrophobicity is enhanced, and the PTFE film leads to a decrease in ECSA and an increase in overpotential. High-speed imaging results indicate that bubbles on hydrophilic electrodes (without PTFE modification) are prone to detachment, with all bubble diameters less than 0.29 mm at a current density of <span><math><mrow><mo>−</mo><mn>50</mn><mspace></mspace><mtext>mA</mtext><mspace></mspace><msup><mrow><mtext>cm</mtext></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></mrow></math></span>. In contrast, the bubble diameter on hydrophobic electrodes (treated with PTFE) increases significantly. For the 0.25 wt% PTFE-modified electrode, the maximum bubble diameter reaches 2.65 mm at a current density of <span><math><mrow><mo>−</mo><mn>450</mn><mspace></mspace><mtext>mA</mtext><mspace></mspace><msup><mrow><mtext>cm</mtext></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></mrow></math></span>, and the adhesion of large bubbles causes a significant decline in HER performance. By analyzing the entire process of bubble growth and detachment, this study elucidates the relationship between bubble evolution behavior on the electrode surface and electrolytic potential variations. Under low current densities, the potential variation caused by bubble detachment is small, while under high current densities, the potential oscillation amplitude of hydrophobic electrodes can reach 33 mV, thereby revealing the mechanism of mass transfer resistance and dynamic changes in the reaction area induced by bubble retention.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":"182 ","pages":"Article 151758"},"PeriodicalIF":8.3000,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Hydrogen Energy","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0360319925047615","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0

Abstract

Alkaline water electrolysis has attracted extensive attention, but its low energy conversion efficiency remains one of the key challenges hindering its industrialization. In this study, Ni–Ru/CF catalyst electrodes were fabricated via electrodeposition, with key parameters including Ru3+ concentration in the deposition solution, deposition potential, and deposition time systematically optimized. The surface wettability of the electrodes was regulated by polytetrafluoroethylene (PTFE) solution impregnation, and the correlation mechanism between bubble evolution behavior and hydrogen evolution reaction (HER) efficiency on electrodes with different wettabilities was analyzed by combining high-speed imaging technology. Results show that the Ni–Ru/CF electrode fabricated under optimized deposition conditions (Ru3+ concentration of 0.02 M, deposition potential of 1.0 V, and deposition time of 180 s) exhibits excellent HER performance, which is an overpotential of 39.75 mV at a current density of 10mAcm2, a Tafel slope of 44.16 mV/dec, an electrochemical active surface area (ECSA) of 790 cm2cm2, and a charge transfer resistance (Rct) of 2.19 Ω. The hierarchical structure of nanoparticles and nanoflowers significantly enhances the exposure of active sites, providing structural support for efficient HER. PTFE modification reveals the key influence of wettability on bubble behavior. As the PTFE concentration increases (0-0.25 wt%), the electrode hydrophobicity is enhanced, and the PTFE film leads to a decrease in ECSA and an increase in overpotential. High-speed imaging results indicate that bubbles on hydrophilic electrodes (without PTFE modification) are prone to detachment, with all bubble diameters less than 0.29 mm at a current density of 50mAcm2. In contrast, the bubble diameter on hydrophobic electrodes (treated with PTFE) increases significantly. For the 0.25 wt% PTFE-modified electrode, the maximum bubble diameter reaches 2.65 mm at a current density of 450mAcm2, and the adhesion of large bubbles causes a significant decline in HER performance. By analyzing the entire process of bubble growth and detachment, this study elucidates the relationship between bubble evolution behavior on the electrode surface and electrolytic potential variations. Under low current densities, the potential variation caused by bubble detachment is small, while under high current densities, the potential oscillation amplitude of hydrophobic electrodes can reach 33 mV, thereby revealing the mechanism of mass transfer resistance and dynamic changes in the reaction area induced by bubble retention.
Ni-Ru /CF电极制备及润湿性改性对电解过程析氢反应和析泡行为的影响
碱水电解技术引起了广泛的关注,但其能量转换效率低的问题一直是阻碍其产业化的关键问题之一。本研究采用电沉积法制备Ni-Ru /CF催化剂电极,系统优化了沉积液中Ru3+浓度、沉积电位、沉积时间等关键参数。通过聚四氟乙烯(PTFE)溶液浸渍调节电极的表面润湿性,并结合高速成像技术分析了不同润湿性电极上气泡演化行为与析氢反应(HER)效率的相关机理。结果表明,在最佳沉积条件下(钌离子浓度为0.02 M,沉积电位为- 1.0 V,沉积时间为180 s)制备的Ni-Ru /CF电极具有优异的HER性能,在电流密度为- 10mAcm−2时,过电位为- 39.75 mV, Tafel斜率为44.16 mV/dec,电化学活性表面积(ECSA)为790 cm2cm−2,电荷转移电阻(Rct)为2.19 Ω。纳米粒子和纳米花的层次结构显著增强了活性位点的暴露,为高效HER提供了结构支持。聚四氟乙烯改性揭示了润湿性对气泡行为的关键影响。随着PTFE浓度的增加(0-0.25 wt%),电极疏水性增强,PTFE膜导致ECSA降低和过电位增加。高速成像结果表明,在电流密度为- 50mAcm−2时,亲水电极(未改性PTFE)上的气泡易于脱落,气泡直径均小于0.29 mm。相比之下,疏水电极(PTFE处理)上的气泡直径显著增加。对于0.25 wt%的ptfe修饰电极,在电流密度为- 450mAcm - 2时,最大气泡直径达到2.65 mm,大气泡的粘附导致HER性能明显下降。本研究通过分析气泡生长和脱离的全过程,阐明了电极表面气泡演化行为与电解电位变化的关系。在低电流密度下,气泡脱离引起的电位变化很小,而在高电流密度下,疏水电极的电位振荡幅度可达33 mV,从而揭示了气泡保留引起的传质阻力和反应区域动态变化的机理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
International Journal of Hydrogen Energy
International Journal of Hydrogen Energy 工程技术-环境科学
CiteScore
13.50
自引率
25.00%
发文量
3502
审稿时长
60 days
期刊介绍: The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信