Kai-Jie Lin, Bing He, Zi-Han Xiao, Ling-Yi Li, Zi-Yi Qiao, Yun-Hai Zhu, Yi-Huang Chen, Yang Wang, Ying-Kui Yang, Xue-Qin Liu
{"title":"Electron-rich Mn:NiFe-LDHs onto BiVO4 photoanode for improved photoelectrochemical water splitting","authors":"Kai-Jie Lin, Bing He, Zi-Han Xiao, Ling-Yi Li, Zi-Yi Qiao, Yun-Hai Zhu, Yi-Huang Chen, Yang Wang, Ying-Kui Yang, Xue-Qin Liu","doi":"10.1007/s12598-025-03494-6","DOIUrl":null,"url":null,"abstract":"<div><p>Rapid hole extraction from photoanodes to cocatalysts is a crucial prerequisite for the realization of highly efficient photoelectrochemical (PEC) water splitting. Herein, Mn-doped nickel–iron layered double hydroxides (Mn:NiFe-LDHs), as a co-catalyst, were grafted on bismuth vanadate (BVO) for significantly improved charge transfer and stability simultaneously, in addition to the accelerated water oxidation kinetics. The detailed experimental and theoretical analysis collectively verify that Mn doping increases charge density around Ni and Fe sites. The electron-rich Ni sites boost the kinetics of oxygen evolution reaction and promote the hole extraction simultaneously. Moreover, the electrons are transferred from electron-rich Fe sites to V sites, which effectively restrains the dissolution of V<sup>5+</sup> ions and enhances the stability of BVO photoanodes. Consequently, the resulting Mn:NiFe-LDH/BVO photoanode achieves a remarkable photocurrent density of 5.5 mA cm<sup>−2</sup> at 1.23 V versus reversible hydrogen electrode (RHE) with excellent stability. The construction of electron-rich oxygen evolution cocatalysts provides a promising strategy to promote the hole extraction and increase the stability for improved PEC performance.</p><h3>Graphical abstract</h3>\n<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"44 10","pages":"7476 - 7485"},"PeriodicalIF":11.0000,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Rare Metals","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s12598-025-03494-6","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Rapid hole extraction from photoanodes to cocatalysts is a crucial prerequisite for the realization of highly efficient photoelectrochemical (PEC) water splitting. Herein, Mn-doped nickel–iron layered double hydroxides (Mn:NiFe-LDHs), as a co-catalyst, were grafted on bismuth vanadate (BVO) for significantly improved charge transfer and stability simultaneously, in addition to the accelerated water oxidation kinetics. The detailed experimental and theoretical analysis collectively verify that Mn doping increases charge density around Ni and Fe sites. The electron-rich Ni sites boost the kinetics of oxygen evolution reaction and promote the hole extraction simultaneously. Moreover, the electrons are transferred from electron-rich Fe sites to V sites, which effectively restrains the dissolution of V5+ ions and enhances the stability of BVO photoanodes. Consequently, the resulting Mn:NiFe-LDH/BVO photoanode achieves a remarkable photocurrent density of 5.5 mA cm−2 at 1.23 V versus reversible hydrogen electrode (RHE) with excellent stability. The construction of electron-rich oxygen evolution cocatalysts provides a promising strategy to promote the hole extraction and increase the stability for improved PEC performance.
从光阳极快速提取空穴到助催化剂是实现高效光电化学(PEC)水分解的重要前提。本文将Mn掺杂的镍铁层状双氢氧化物(Mn: nfe - ldhs)作为助催化剂接枝在钒酸铋(BVO)上,显著改善了电荷转移和稳定性,同时加速了水氧化动力学。详细的实验和理论分析共同验证了Mn掺杂增加了Ni和Fe位点周围的电荷密度。富电子Ni位点在促进析氧反应动力学的同时,也促进了空穴的萃取。此外,电子从富电子的Fe位转移到V位,有效地抑制了V5+离子的溶解,提高了BVO光阳极的稳定性。因此,与可逆氢电极(RHE)相比,所得到的Mn:NiFe-LDH/BVO光阳极在1.23 V下获得了5.5 mA cm - 2的光电流密度,具有优异的稳定性。构建富电子析氧共催化剂为促进空穴萃取和提高析氧性能的稳定性提供了一种很有前途的策略。图形抽象
期刊介绍:
Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.