Oxygen vacancy mediated and enhanced metal-P bonds for stabilizing reconstruction for alkaline freshwater and seawater electrolysis

IF 12.7 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

ACS Central Science Pub Date : 2024-11-05 DOI:10.1039/d4ta06201a

Lei Jin, Hui Xu, Kun Wang, Yang Liu, Xingyue Qian, Guangyu He, Haiqun Chen

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Abstract

The performance of electrochemical water splitting can be effectively enhanced by preventing irreversible structural distortion that leads to the leaching of active elements. In this study, a porous grass-shaped Fe₂P/Ni₅P₄-Ov catalyst was synthesized using oxygen vacancies (Ov), exhibiting robust M–P bonds. Both experimental and theoretical investigations show that these strong M–P bonds play a crucial role in stabilizing electrochemical transformation of the precursor catalyst to active Ni, Fe-(oxy)hydroxide species, thereby reducing Fe loss. Additionally, the enhanced orbital coupling weakens the OH–H bonds in the H₂O molecule. Remarkably, Fe₂P/Ni₅P₄-Ov demonstrates exceptional OER and HER activity and stability in both alkaline freshwater and seawater solutions by preventing the leaching of Fe elements. This research underscores the transition from metal–organic frameworks to the evolution of metal oxides into metal phosphides and offers insights into inhibiting the leaching of active elements.

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氧空位介导和增强金属-P 键，用于碱性淡水和海水电解的稳定重建

通过防止导致活性元素沥滤的不可逆结构畸变，可有效提高电化学水分离的性能。本研究利用氧空位（Ov）合成了一种多孔禾草形 Fe2P/Ni5P4-Ov 催化剂，该催化剂表现出很强的 M-P 键。实验和理论研究均表明，这些强 M-P 键在稳定前驱体催化剂向活性镍、铁（氧）氢氧化物物种的电化学转化过程中发挥了至关重要的作用，从而减少了铁的损失。此外，增强的轨道耦合减弱了 H2O 分子中的 OH-H 键。值得注意的是，Fe2P/Ni5P4-Ov 通过防止铁元素的沥滤，在碱性淡水和海水溶液中均表现出卓越的 OER 和 HER 活性和稳定性。这项研究强调了从金属有机框架到金属氧化物演变为金属磷化物的过渡，并为抑制活性元素的沥滤提供了启示。

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来源期刊

ACS Central Science Chemical Engineering-General Chemical Engineering

CiteScore

25.50

自引率

0.50%

发文量

194

审稿时长

10 weeks

期刊介绍： ACS Central Science publishes significant primary reports on research in chemistry and allied fields where chemical approaches are pivotal. As the first fully open-access journal by the American Chemical Society, it covers compelling and important contributions to the broad chemistry and scientific community. "Central science," a term popularized nearly 40 years ago, emphasizes chemistry's central role in connecting physical and life sciences, and fundamental sciences with applied disciplines like medicine and engineering. The journal focuses on exceptional quality articles, addressing advances in fundamental chemistry and interdisciplinary research.