An oxide-promoted, self-supported Ni4Mo catalyst for high current density anion exchange membrane water electrolysis†

IF 32.4 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Ariana Serban, Meng-Ting Liu, Nanjun Chen, Hao Ming Chen and Xile Hu
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Abstract

Anionic exchange membrane (AEM) water electrolyzers are emerging as a cost-effective technology for green hydrogen production. However, state-of-the-art AEM electrolyzers rely on platinum group metal (PGM) catalysts for the hydrogen evolution reaction (HER). Currently, PGM-free HER catalysts exhibit inadequate activity and stability at high current densities in electrolyzer environments. Here, we report a simple electrodeposition method for a self-supported Ni4Mo–MoOx catalyst. This catalyst exhibits remarkable HER activity, as demonstrated both in three-electrode cells as well as in prototype AEM electrolyzers. In particular, the catalyst enables AEM electrolyzers to operate stably at current densities as high as 3 A cm−2, which had not been reported for a non-PGM HER catalyst. The performance (2 V@3 A cm−2) is comparable to the benchmark Pt/C, whereas the stability is even higher. Characterization and particularly operando X-ray diffraction and absorption spectroscopy reveal that the catalyst is an unconventional tetragonal Ni4Mo with a D1a superlattice whose surface contains in situ formed MoOx species. The cooperative action of MoOx and Ni4Mo enhances the volmer step of HER, attributing to the superior activity.

Abstract Image

一种用于大电流密度阴离子交换膜电解的氧化促进、自支撑Ni4Mo催化剂
阴离子交换膜(AEM)水电解槽是一种经济高效的绿色制氢技术。然而,最先进的AEM电解槽依靠铂族金属(PGM)催化剂进行析氢反应(HER)。目前,不含pgm的HER催化剂在电解槽环境中的高电流密度下表现出不足的活性和稳定性。在这里,我们报告了一种简单的电沉积方法来制备自支撑Ni4Mo-MoOx催化剂。该催化剂在三电极电池和原型AEM电解槽中均表现出显著的HER活性。特别是,催化剂使AEM电解槽能够在高达3 A/cm2的电流密度下稳定运行,这在非pgm HER催化剂中还没有报道过。性能(2 V@3 A/cm2)与基准Pt/C相当,而稳定性甚至更高。表征,特别是operando x射线衍射和吸收光谱表明,催化剂是具有D1a超晶格的非常规四方Ni4Mo,其表面含有原位形成的MoOx物质。MoOx和Ni4Mo的协同作用增强了HER的Volmer阶跃,这是由于它们的活性更强。
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来源期刊
Energy & Environmental Science
Energy & Environmental Science 化学-工程:化工
CiteScore
50.50
自引率
2.20%
发文量
349
审稿时长
2.2 months
期刊介绍: Energy & Environmental Science, a peer-reviewed scientific journal, publishes original research and review articles covering interdisciplinary topics in the (bio)chemical and (bio)physical sciences, as well as chemical engineering disciplines. Published monthly by the Royal Society of Chemistry (RSC), a not-for-profit publisher, Energy & Environmental Science is recognized as a leading journal. It boasts an impressive impact factor of 8.500 as of 2009, ranking 8th among 140 journals in the category "Chemistry, Multidisciplinary," second among 71 journals in "Energy & Fuels," second among 128 journals in "Engineering, Chemical," and first among 181 scientific journals in "Environmental Sciences." Energy & Environmental Science publishes various types of articles, including Research Papers (original scientific work), Review Articles, Perspectives, and Minireviews (feature review-type articles of broad interest), Communications (original scientific work of an urgent nature), Opinions (personal, often speculative viewpoints or hypotheses on current topics), and Analysis Articles (in-depth examination of energy-related issues).
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