Journal
ADVANCED ENERGY MATERIALS
Volume 11, Issue 36, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202101789
Keywords
alkaline water splitting; d-orbital regulation; low-Pt catalysts; theoretically designed catalysts; XAFS
Categories
Funding
- Natural Science Foundation of Jiangsu Province [BK20191443]
- National Natural Science Foundation of China [91961125, 21905019]
- Key Program for International S&T Cooperation Projects of China from the Ministry of Science and Technology of China [2018YFE0124600]
- Fundamental Research Funds for the Central Universities [2018JBZ107, 2019RC035]
- Qinglan Project of Yangzhou University
- Excellent One Hundred project of Beijing Jiaotong University
- Chemistry and Chemical Engineering Guangdong Laboratory [1932001, 1932004]
- Science and Technology Project of Guangdong Province [2020B0101370001]
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Water electrolysis in alkaline environments is a promising method for large-scale hydrogen production. NiPt alloys with atomically dispersed Pt at the edges are designed to boost hydrogen evolution in alkaline solution. The catalyst shows ultralow overpotential and high stability, making it a feasible option for overall water-splitting applications.
Water electrolysis operating in alkaline environments is a promising route to produce H-2 on a massive scale. In this context, designing highly-active and low-cost electrocatalysts is of great importance. Here NiPt alloys with plenty of atomically dispersed Pt at the edges to boost hydrogen evolution in alkaline solution are reported. The formed Ni-Pt atomic pairs at the edges hold engineered electronic structures by reducing the number of coordination atoms to facilitate the kinetically sluggish Volmer step, and further promote the hydrogen coupling step by providing separate active sites as well. With a Pt content of 3(at)%, this catalyst records an ultralow overpotential of 6 mV to reach the current density of 10 mA cm(-2), and delivers a current density of 68.3 mA cm(-2) at the overpotential of 30 mV, exceeding that of the commercial 20(wt)% Pt/C catalyst by a factor of >4. The aberration-corrected transmission electron microscopy and quasi-operando X-ray absorption fine structure measurements show Ni-Pt atomic pairs serve as active sites and enable the subtle adsorption/desorption balances between various intermediates (OH* and H*) during the hydrogen evolution reaction. The as-made alloys show high stability with negligible activity decay after a 12 h chronoamperometric test, addressing its feasibility in an overall water-splitting cell.
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