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Research Article

A stepwise-designed Rh-Au-Si nanocomposite that surpasses Pt/C hydrogen evolution activity at high overpotentials

Binbin Jiang1, Lulu Yang1, Fan Liao1, Minqi Sheng2(), Haozhe Zhao1, Haiping Lin1(), Mingwang Shao1()
Jiangsu Key Laboratory for Carbon-Based Functional Materials & DevicesInstitute of Functional Nano & Soft Materials (FUNSOM)Soochow UniversitySuzhou215123China
School of Iron and SteelSoochow UniversitySuzhou215123China
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Abstract

Hydrogen evolution by electrocatalysis is an attractive method of supplying clean energy. However, it is challenging to find cheap and efficient alternatives to rare and expensive platinum based catalysts. Pt provides the best hydrogen evolution performance, because it optimally balances the free energies of adsorption and desorption. Appropriate control of these quantities is essential for producing an efficient electrocatalyst. We demonstrate, based on first principles calculations, a stepwise designed Rh-Au-Si ternary catalyst, in which adsorption (the Volmer reaction) and desorption (the Heyrovsky reaction) take place on Rh and Si surfaces, respectively. The intermediate Au surface plays a vital role by promoting hydrogen diffusion from the Rh to the Si surface. Theoretical predictions have been explored extensively and verified by experimental observations. The optimized catalyst (Rh-Au-SiNW-2) has a composition of 2.2:28.5:69.3 (Rh: Au: Si mass ratio) and exhibits a Tafel slope of 24.0 mV·dec–1. Its electrocatalytic activity surpasses that of a commercial 40 wt.% Pt/C catalyst at overpotentials above 0.19 V by exhibiting a current density of greater than 108 mA·cm–2. At 0.3 V overpotential, the turnover frequency of Rh-Au-SiNW-2 is 10.8 times greater than that of 40 wt.% Pt/C. These properties may open new directions in the stepwise design of highly efficient catalysts for the hydrogen evolution reaction (HER).

Keywords

Au nanoparticlesRh nanoparticlesSi nanowireselectrocatalysishydrogen evolution reaction

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Nano Research
Volume 10 Issue 5,
May 2017
Pages 1749-1755
DOI: 10.1007/s12274-017-1447-0
Cite this article:
Jiang B, Yang L, Liao F, et al. A stepwise-designed Rh-Au-Si nanocomposite that surpasses Pt/C hydrogen evolution activity at high overpotentials. Nano Research, 2017, 10(5): 1749-1755. https://doi.org/10.1007/s12274-017-1447-0
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