Surface reconstruction of cobalt phosphide nanosheets by electrochemical activation for enhanced hydrogen evolution in alkaline solution

Transition metal phosphides exhibit promising catalytic performance for the hydrogen evolution reaction (HER); however their surface structure evolution during electrochemical operation has rarely been studied. In this work, we investigate the surface reconstruction of CoP nanosheets by an electroch...

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Bibliographic Details
Published in:Chemical science (Cambridge) 2019-02, Vol.10 (7), p.2019-2024
Main Authors: Su, Liang, Cui, Xiangzhi, He, Ting, Zeng, Liming, Tian, Han, Song, Yiling, Qi, Kai, Xia, Bao Yu
Format: Article
Language:English
Subjects:
Activation
Catalysis
Electrocatalysts
Electrochemical activation
Electrolysis
Hydrogen evolution reactions
Morphology
Nanosheets
Phosphides
Reconstruction
Surface structure
Synergistic effect
Transition metals
X ray photoelectron spectroscopy
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Summary:Transition metal phosphides exhibit promising catalytic performance for the hydrogen evolution reaction (HER); however their surface structure evolution during electrochemical operation has rarely been studied. In this work, we investigate the surface reconstruction of CoP nanosheets by an electrochemical activation method. After remodeling, CoP nanosheets experience an irreversible and significant evolution of the morphology and composition, and low-valence Co complexes consisting of Co(OH) species are formed on the surface of CoP nanosheets, and they largely accelerate the dissociation of water. Benefiting from the synergistic effect of CoP and Co(OH) , the working electrode shows a remarkably enhanced HER activity of 100 mV at 10 mA cm with a Tafel slope of 76 mV dec , which is better than that of most transition metal phosphide catalysts. This work would provide a deep understanding of surface reconstruction and a novel perspective for rational design of high performance transition metal phosphide electrocatalysts for water related electrolysis.
ISSN:2041-6520
2041-6539
DOI:10.1039/c8sc04589e