期刊
CHEMICAL ENGINEERING JOURNAL
卷 415, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.129031
关键词
CoP; Hydrogen evolution reaction; Oxygen reduction reaction; Heterostructure; Electron redistribution
资金
- Key Program of the National Natural Science Foundation of China [91963206, 21932004, 91745108]
- Natural Science Foundation of Jiangsu Province [BK20180180]
A novel ternary heterostructured CoP/C/Ni catalyst with electron modulation effect was proposed to enhance its electrocatalytic activity, reducing the adsorption energy of hydrogen on the surface, showing high activity for hydrogen evolution and oxygen reduction reactions, and exhibiting superior stability.
Cobalt phosphide (CoP) with its platinum-group-metal like catalytic features has triggered substantial concerns on electrocatalytic hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR) under acidic and alkaline conditions. However, the electrocatalytic rate on CoP is restricted because of the reaction intermediates binding to its surface strongly, leading to sluggish reaction kinetics and unsatisfied catalytic performance. Herein, we describe a ternary heterostructured CoP/CN/Ni catalyst with oriented electron modulation effect to boost its electrocatalytic activity, where the electronic structure of the outer CoP is modulated by the endowed electrons from underlying Ni nanoparticles, which are encapsulated and protected by 2?3 N-doped carbon (CN) layers from oxidation and corrosion in harsh environment. Theoretical calculations reveal that the electron redistribution effect could decrease the adsorption energy of hydrogen (?GH*) on CoP from -0.25 eV to -0.1 eV. Benefiting from such electron modulation, CoP/CN/Ni only needs overpotentials of 66 mV in 0.5 M H2SO4 and 106 mV in 1 M KOH for HER to afford a current density of 10 mA cm-2 and presents the comparable ORR activity with Pt/C in 0.1 M KOH. Besides, the unique structure also endows CoP/CN/Ni with superior electrocatalytic stability for HER and ORR.
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