期刊
CHEMICAL ENGINEERING JOURNAL
卷 436, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.135044
关键词
Support effect; Ru-based catalyst; Ammonium tungsten bronze; Hydrogen evolution; In-situ Raman
资金
- National Natural Science Foundation of China [51772338, 51972349, 91963210, U1801255]
Reasonable structure design and fine electronic modulation are the keys to achieving platinum-like performance on Ru-based catalyst. In this study, the integration of Ru nanoparticles with β-HATB nanowires as an acidic electrocatalyst showed excellent catalytic activity similar to platinum. The optimized kinetics of hydrogen adsorption/desorption behavior on Ru surface by β-HATB and the stable and fast charge transfer channel contributed to the improved catalytic activity.
Reasonable structure design and fine electronic modulation are the keys to achieving the platinum-like hydrogen evolution reaction (HER) performance on Ru-based catalyst, but also challenges. Here, the integration of uniformly dispersed ultra-fine Ru nanoparticles with beta-hexagonal ammonium tungsten bronze (beta-HATB) nanowires is reported as an efficient acidic electrocatalyst. Due to the strong metal-support interaction, the surface charge state of Ru is effectively regulated, forming a mixed valence state composed of zero valence and offset state. The prepared Ru@beta-HATB/CC exhibits a Pt-like catalytic activity with a small overpotential of 25 mV and a very low Tafel slope of 27.6 mV dec(-1). In-situ Raman spectroscopy and electrochemical analysis reveal that beta-HATB does not directly participate in HER reaction and hydrogen spillover effect (H-ads from beta-HATB to Ru NPs) is not the main reason for the hydrogen evolution activity, but beta-HATB can optimize the kinetics of hydrogen adsorption/desorption behavior on Ru surface and provide a stable and fast charge transfer channel, thus improving HER activity.
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