Lixue Peng , Yanqin Liang , Shuilin Wu , Zhaoyang Li , Huaijun Sun , Hui Jiang , Shengli Zhu , Zhenduo Cui , Li Li
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引用次数: 0
摘要
电催化析氢反应(HER)是获得可持续氢能的一种可选的生态友好策略。然而,在碱性介质中,由于氢的吸附和水解困难,HER表现出缓慢的动力学。本文通过合金处理和部分电氧化制备了具有自支撑结构的分层纳米多孔Ni/NiO催化剂。短时间电氧化可显著提高HER在碱性介质中的催化活性。经过3 s电氧化处理的Ni/ nio - 3s样品在电流密度为10 mA cm−2时,过电位为25 mV,表现出优异的催化性能。NiO和Ni的协同作用改善了Volmer和Heyrosky步骤的动力学。纳米孔结构为物质和电荷的转移提供了更多的活性位点和便利。自支撑结构,长期稳定。这项工作为设计高效析氢反应的金属/金属氧化物催化剂提供了一种有效的策略。
Nanoporous Ni/NiO catalyst for efficient hydrogen evolution reaction prepared by partial electro-oxidation after dealloying
The electrocatalytic hydrogen evolution reaction (HER) is an alternative eco-friendly strategy to obtain sustainable hydrogen energy. However, the HER in alkaline medium exhibits sluggish kinetics because of the difficulty of hydrogen adsorption and hydrolysis. Herein, a hierarchical nanoporous Ni/NiO catalyst with self-supported structures is prepared through dealloying followed by partial electro-oxidation. The catalytic activity for HER in alkaline medium is significantly enhanced by very short time electro-oxidation. The Ni/NiO-3 s sample (subjectied to 3 s of electro-oxidation) exhibits the outstanding catalytic performance with an overpotential of 25 mV at the current density of 10 mA cm−2. The synergic effect of NiO and Ni improves the kinetics of Volmer and Heyrosky steps. The nanoporous structure provides more active sites and facilities for the transfer of substances and charges. The self-supporting structure ensures long-term stability. This work offers an effective strategy to design metal/metal oxide catalysts for efficient hydrogen evolution reactions.
期刊介绍:
The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.