Electron-rich Mn:NiFe-LDHs onto BiVO4 photoanode for improved photoelectrochemical water splitting

IF 11 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
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
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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.

Graphical abstract

BiVO4光阳极上富电子Mn:NiFe-LDHs改善光电化学水分解
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
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Rare Metals
Rare Metals 工程技术-材料科学:综合
CiteScore
12.10
自引率
12.50%
发文量
2919
审稿时长
2.7 months
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.
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