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Amorphous‐crystalline Co−B−P Catalyst for Synergistically Enhanced Hydrogen Evolution Reaction
Author(s) -
Bao Xinghong,
Li Yuting,
Wang Juan,
Zhong Qin
Publication year - 2020
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.202001343
Subject(s) - tafel equation , catalysis , overpotential , amorphous solid , materials science , chemical engineering , electrochemistry , hydrogen production , dissociation (chemistry) , inorganic chemistry , chemistry , crystallography , electrode , organic chemistry , engineering
The development of highly practical and stable catalysts for hydrogen evolution reaction (HER) remains challenging to accomplish continuous H 2 production through water electrolysis. In this work, the porous network Co−B−P amorphous‐crystalline catalyst was synthesized through a hydrothermal‐alternating immersion boronization‐phosphidation pathway. The Co−B−P nanocomposite consists of the amorphous Co−B−O and crystalline Co 2 P 2 O 7 compositions. The Co−B−P catalyst shows highly effective HER electrochemical performance with low overpotential of 51 mV at current density of 10 mA cm −2 and Tafel slope of 44 mV dec −1 in alkaline solution (pH=14). After 1000 cycles of CV scanning, the catalyst shows no significant reduction in HER performance. Such superior HER performance can be ascribed to (1) the amorphous Co−B−O structure accelerating charge transfer between active sites and intermediates and (2) the formed P−O bonds of crystalline Co 2 P 2 O 7 promoting the dissociation course of water molecules. The combination of crystalline and amorphous substances provides prospects for the design of HER catalyst structures in the future.