Well-dispersed cobalt nanoparticles (NPs) are synthesized on a silicon oxide/nitrogen-doped carbon framework derived from sustainable bamboo leaves through in situ pyrolysis of cobalt silicate/nitrogen-doped carbon. The three-dimensional (3D) transmission electron microscopy (TEM) tomography technique reveals the detailed distribution of Co NPs on the framework. The framework ensures a fine distribution, provides an interconnected conductive network, and improves the catalytic activity and stability of the ternary Co catalysts. Consequently, the optimized CR900 electrocatalyst exhibits superior electrochemical activity, including a low overpotential of 263 mV at 10 mA cm−2 and a half-wave potential of 0.81 V for OER and ORR, respectively. Furthermore, the Zn-air battery with the CR900 catalyst displays a maximum power density of 138.2 mW cm−2 and prominent cycling durability after 400 h. Furthermore, we provide insights into the scalable synthetic strategy of metal or alloy-based catalysts towards high-performance rechargeable metal-air batteries.
Bibliographical noteKAUST Repository Item: Exported on 2022-06-14
Acknowledgements: Many thanks to Dr Daliang Zhang for the TEM and HRTEM measurements in King Abdullah University of Science and Technology (KAUST), Saudi Arabia. This work was supported by the National Natural Science Foundation of China, China (U1904215, NSFC-21671170, 21673203, 21901221, 21901222, and 20201010), Natural Science Foundation of Jiangsu Province (BK20190870), Program for New Century Excellent Talents of the University in China, China (NCET-13-0645), the Six Talent Plan (2015-XCL-030), Postgraduate Research & Practice Innovation Program of Jiangsu Province as well as the Science and Technology Innovation Foster Foundation of Yangzhou University (XKYCX19_060). We also acknowledge the Priority Academic Program Development of Jiangsu Higher Education Institutions and the technical support we received at the Testing Center of Yangzhou University.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.
ASJC Scopus subject areas
- Environmental Chemistry
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering