Journal
ACS CATALYSIS
Volume 9, Issue 8, Pages 691-6928Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.9b00494
Keywords
bimetallic phosphide; bicontinuous structure; Ni2P-Cu3P; hydrogen evolution reaction; catalyst
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Funding
- National Natural Science Foundation of China [51701023, 51874049]
- Scientific Research Fund of Hunan Provincial Education Department [16C0026]
- Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, Changsha University of Science & Technology, China [2016CL04]
- US Department of Energy, Office of Basic Energy Sciences, Division of Chemical, Biological and Geological Sciences [DE-FG02-86ER13622]
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A direct and effective approach is proposed to fabricate bimetallic phosphide Ni2P-Cu3P with controllable phase composition and distribution for catalytic hydrogen evolution reaction (HER). Unlike previously reported precursors, a porous Ni-Cu alloy incorporated with graphitic carbon (NiCuC) prepared via powder metallurgy is employed herein, and the generated Ni2P-Cu3P@NiCuC possesses a hierarchical porous structure and controllable phase composition due to the high porosity and tunable Ni/Cu ratio of the precursor. With an optimal Cu content of 30.0 wt %, the catalyst demonstrates the highest catalytic activity due to a synergistic interaction between different metallic phosphide sites and the facilitated mass transport. Meanwhile, density functional theory (DFT) calculation reveals that the atomic interaction of Ni2P-Cu3P substantially lower the activation barrier for enhanced HER catalytic activity. The powder metallurgy provides an approach for the design of bimetallic phosphide electrocatalysts for HER and other catalytic applications.
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