用于氢气进化反应的硫化铁钼电催化剂：操作性 XAS 研究

IF 5.5 3区材料科学 Q1 ELECTROCHEMISTRY Electrochimica Acta Pub Date : 2024-11-24 DOI:10.1016/j.electacta.2024.145418

Anastassiya Khan, Adina Morozan, Hannah Johnson, Vincent Artero, Andrea Zitolo

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引用次数: 0

摘要

结构-电催化活性关系的综合表征对于支持质子交换膜（PEM）电解槽中氢气进化反应（HER）高效催化剂的开发具有重要意义。据报道，一种双金属硫化铁钼电催化剂已成功应用于 PEM 电解槽中的氢进化反应。然而，其活性位点的确切性质仍然难以捉摸。在本研究中，我们采用 X 射线吸收光谱 (XAS) 研究了通过微波辐照合成方法获得的铁钼和钼硫化物。在酸性环境中进行的操作性 XAS 测量发现了硫缺陷的无定形 MoSx 和 FeS 相。虽然掺杂剂铁的含量比钼低 10 倍，但这两种相之间的协同作用促进了铁钼硫化物的 HER 性能。

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Iron-Molybdenum Sulfide Electrocatalysts for the Hydrogen Evolution Reaction: An Operando XAS study

The comprehensive characterization of the structure-electrocatalytic activity relationships is of great interest to support the development of efficient catalysts for hydrogen evolution reaction (HER) in proton-exchange membrane (PEM) electrolyzers. The successful implementation of a bimetallic iron-molybdenum sulfide electrocatalyst for HER into a PEM electrolyzer has been reported. However, the precise nature of their active sites is still elusive. In this study, we employed X-ray absorption spectroscopy (XAS) to study iron-molybdenum and molybdenum sulfides obtained by a microwave irradiation synthetic approach. Operando XAS measurements in an acidic environment revealed sulfur-defective amorphous MoS_x and FeS phases. Although the amount of dopant Fe is 10 times lower than that of Mo, the synergy between the two phases promotes the HER performance of iron-molybdenum sulfides.

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来源期刊

Electrochimica Acta 工程技术-电化学

CiteScore

11.30

自引率

6.10%

发文量

1634

审稿时长

41 days

期刊介绍： Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.