A sandwich structure of cobalt pyrophosphate/nickel phosphite@C: one step synthesis and its good electrocatalytic performance

Oxygen evolution reaction (OER) is the basic reaction to achieve water decomposition and hydrogen production. Here, an OER catalyst material, carbon-coated cobalt pyrophosphate/nickel phosphite (Co 2 P 2 O 7 /Ni(PO 3 ) 2 @C) composite with sandwich structure, was prepared in vacuum environment by a...

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Bibliographic Details
Published in:Journal of solid state electrochemistry 2022-05, Vol.26 (5), p.1221-1230
Main Authors: Zhu, Yabo, Xie, Tingting, Zhang, Sheng, Zhang, Nao, Wang, Guanglan, Feng, Peizhong, Xu, Huan, Lv, Kali
Format: Article
Language:English
Subjects:
Analytical Chemistry
Carbon
Catalysts
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Cobalt
Condensed Matter Physics
Current density
Decomposition reactions
Electrochemistry
Energy Storage
Homology
Hydrogen production
Metal compounds
Nickel
Original Paper
Oxygen evolution reactions
Phosphating (coating)
Physical Chemistry
Sandwich structures
Transition metal compounds
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Summary:Oxygen evolution reaction (OER) is the basic reaction to achieve water decomposition and hydrogen production. Here, an OER catalyst material, carbon-coated cobalt pyrophosphate/nickel phosphite (Co 2 P 2 O 7 /Ni(PO 3 ) 2 @C) composite with sandwich structure, was prepared in vacuum environment by a simple method, which not only simplified the traditional two-step phosphating process but also directly formed carbon layer from homologous carbon. The tests for OER showed that the Co 2 P 2 O 7 /Ni(PO 3 ) 2 @C composite had lower overpotential and Tafel slope as well as stable catalytic property in alkaline solution. In 1 M KOH, the composite exhibited the overpotential of 279 mV which was lower than that of commercial catalyst at a current density of 10 mA cm −2 , and its Tafel slope is 102 mV dec −1 . Due to the protection of the carbon layer, the composite exhibited good stability, so that the current density only decreased 3.9% after being cycled for 12 h. This study should help to obtain other stable electrocatalytic materials of transition metal compounds as OER catalysts.
ISSN:1432-8488
1433-0768
DOI:10.1007/s10008-022-05156-4