Trimetallic Octahedral Ni-Co-W Phosphoxide Sprouted from Plasma-Defect-Engineered Ni-Co Support for Ultrahigh-Performance Electrocatalytic Hydrogen Evolution

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Zhang, Q
Chen, W
Chen, G
Huang, J
Ouyang, B
Chen, D
Kan, E
Lan, T
Li, C
Choi, HS
Ostrikov, KK
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2021
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Abstract

The fundamental obstacle that only a few part of hydrogen energy is currently produced by industrial electrocatalysis, is in insufficient performance and high cost of even the most advanced catalysts. To meet the demand for high-performance, lasting catalysts at industry-relevant current densities (≥500 mA cm-2) with overpotentials ≤300 mV, here, we uniquely heterointerface the Ni, Co, and W phosphoxide phases in situ on plasma-defect-engineered Ni-Co support (MxO@MxP/PNCF (M = Ni, Co, W) core-shell heterostructure) to dramatically enhance the electrocatalytic performances with very high current densities. The achieved H2 evolution requires low overpotentials of only 53 and 343 mV for current densities of 10 (j10) and 1000 mA cm-2 (j1000) and shows fast reaction kinetics with a small Tafel slope of 40 mV dec-1. Importantly, the MxO@MxP/PNCF presents spectacular activity at industry-relevant current densities (>j300) and outperforms the industry Pt/C benchmark. Our catalyst shows excellent long-term stability and durability with no significant activity loss after 104 cycles and 100 h of operation in an alkaline electrolyte. First-principles simulations reveal the best metal-phosphide combination to minimize the Gibbs energy for absorbing H+ ions on the reactive sites and to enhance the desorption of H2.

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ACS Sustainable Chemistry and Engineering

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9

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22

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Inorganic chemistry

Analytical chemistry

Chemical engineering

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Zhang, Q; Chen, W; Chen, G; Huang, J; Ouyang, B; Chen, D; Kan, E; Lan, T; Li, C; Choi, HS; Ostrikov, KK, Trimetallic Octahedral Ni-Co-W Phosphoxide Sprouted from Plasma-Defect-Engineered Ni-Co Support for Ultrahigh-Performance Electrocatalytic Hydrogen Evolution, ACS Sustainable Chemistry and Engineering, 2021, 9 (22), pp. 7454-7465

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