Preparation of nanoporous Co phosphide and its electrocatalytic performance for hydrogen evolution

Abstract

Abstract: Nanoporous Co, NiCo(OH)₂/Co and NiCo(OH)₂-P composite electrodes were prepared by Dealloying, Hydrothermal synthesis and Chemical vapor deposition. The phase, morphology and structure of the electrode were characterized by the X-ray diffractometer (XRD) and scanning electron microscope(SEM). In 1 mol·L^－1KOH solution, the electrocatalytic hydrogen evolution properties of the electrode were measured by the linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The results show that the properties of nanoporous Co, NiCo(OH)₂/Co, NiCo(OH)₂-P electrode materials increase in turn. The overpotential of nanoporous NiCo(OH)₂-P after chemical vapor deposition(CVD)phosphorization is 139 mV at 10 mA·cm^－2 current density, and Tafel slope is 123.57 mV·dec^－1, the double layer capacitance is 30.16 mF·cm^－2. After 1 000 cycles of cyclic voltammetry, nanoporous NiCo(OH)₂-P electrode show excellent hydrogen evolution reaction (HER) stability with only 7 mV change of hydrogen evolution overpotential at 10 mA·cm^－2 current density.

Key words: rapid solidification, dealloying, hydrothermal synthesis, chemical vapor deposition, Co-based phosphate

CLC Number:

TG146.1

LI Chang-feng, ZHOU Qi, WANG Deng-hui, LIN Wen-bin. Preparation of nanoporous Co phosphide and its electrocatalytic performance for hydrogen evolution[J]. Journal of Lanzhou University of Technology, 2022, 48(3): 1-6.

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