1. Realizing high performance bifunctional energy storage devices and electrocatalytic water splitting catalysts through regulated interface engineering of ZnCo2O4@Co3O4 nanosheets.
- Author
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Miao, Lihua, Sui, Lili, Shen, Xiaoyan, Yang, Dan, Huang, He, and Kuang, Ye
- Subjects
OXYGEN evolution reactions ,ENERGY storage ,HYDROGEN evolution reactions ,GIBBS' free energy ,ELECTROCATALYSTS ,ACTIVATION energy ,CATALYSTS ,CATALYTIC activity - Abstract
The development and optimization of electrocatalysts is one of the key points to reduce the energy barrier of electrocatalytic water splitting and improve the kinetics of electrocatalytic reactions. It is necessary to develop low-cost, high-performance electrocatalysts with large-scale application prospects. In order to solve this problem, hybrid structured ZnCo
2 O4 @Co3 O4 nanowires are successfully synthesized through hydrothermal synthesis and electrodeposition. As electrocatalysts for water splitting, ZnCo2 O4 @Co3 O4 can reach a current density of 50 mA cm−2 at an overpotential of 278 mV for the OER and 166 mV@−10 mA cm−2 for the HER, which could be higher than that of single ZnCo2 O4 and Co3 O4 . At the same time, ZnCo2 O4 @Co3 O4 samples also exhibit a cell voltage of 1.67 V at a high current density of 50 mA cm−2 and superior durability for 50 h. The fabricated product also showcases a specific capacitance of 1316 F g−1 at 1 A g−1 . Additionally, the assembled device attains a maximum energy density of 47.3 W h kg−1 at a power density of 1126 W kg−1 . Furthermore, density functional theory (DFT) calculation further confirms that the heterostructure can significantly promote Gibbs free energy for hydrogen adsorption. And the significant increase in the density of total states (DOS) also enhances the catalytic activity for the HER. [ABSTRACT FROM AUTHOR]- Published
- 2023
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