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

IF 4.1 3区 化学 Q1 CHEMISTRY, ANALYTICAL
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 ,&nbsp;Yujin Son ,&nbsp;Yunji Jeong,&nbsp;Moonsu Kim,&nbsp;Gibaek Lee","doi":"10.1016/j.jelechem.2024.118826","DOIUrl":null,"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":4.1000,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Electroanalytical Chemistry","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S157266572400804X","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, ANALYTICAL","Score":null,"Total":0}
引用次数: 0

Abstract

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 via in situ precipitation, focusing on the impact of the solvent composition on the morphology and catalytic performance of the material. The volumetric ratio of H2O to ethanol in the solvent mixture was systematically varied, revealing that higher proportions of H2O 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−2 for OER and 131 mV at 10 mA cm−2 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.

Abstract Image

求助全文
约1分钟内获得全文 求助全文
来源期刊
CiteScore
7.80
自引率
6.70%
发文量
912
审稿时长
2.4 months
期刊介绍: The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.
×
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:481959085
Book学术官方微信