Journal
ACS APPLIED NANO MATERIALS
Volume 4, Issue 12, Pages 12957-12965Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.1c01676
Keywords
electrocatalyst; hydrogen evolution reaction; pulsed plasma; nanoparticles; metal alloy; electrochemistry; density functional theory; platinum; catalysts; nanoparticles; plasma synthesis
Funding
- Vetenskapsradet [2017-04862, 2017-04380]
- Energimyndigheten [45419-1, 50779-1]
- Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO Mat LiU) [2009 00971]
- Swedish Research Council [2017-04380] Funding Source: Swedish Research Council
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This study introduces a hybrid PtxNi1-x electrocatalyst with very low noble metal content, which exhibits excellent HER activity and impressive performance in experimental settings. The findings are further rationalized through theoretical studies, providing insights into the mechanism behind the catalytic performance.
The hydrogen evolution reaction (HER) is a key process in electrochemical water splitting. To lower the cost and environmental impact of this process, it is highly motivated to develop electrocatalysts with low or no content of noble metals. Here, we report on an ingenious synthesis of hybrid PtxNi1-x, electrocatalysts in the form of a nanoparticle-nanonetwork structure with very low noble metal content. The structure possesses important features such as good electrical conductivity, high surface area, strong interlinking, and substrate adhesion, which render an excellent HER activity. Specifically, the best performing Pt0.05Ni0.95 sample demonstrates a Tafel slope of 30 mV dec(-1) in 0.5 M H2SO4 and an overpotential of 20 mV at a current density of 10 mA cm(-2) with high stability. The impressive catalytic performance is further rationalized in a theoretical study, which provides insight into the mechanism on how such small platinum content can allow for close-to-optimal adsorption energies for hydrogen.
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