Journal
CHEMICAL ENGINEERING JOURNAL
Volume 401, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.126005
Keywords
3D TEM tomography technique; In situ pyrolysis; Co nanoparticle; Nitrogen-doped carbon/silicon oxide framework; Rechargeable Zn-air battery
Categories
Funding
- National Natural Science Foundation of China, China [U1904215, NSFC21671170, 21673203, 21901221, 21901222, 20201010]
- Natural Science Foundation of Jiangsu Province [BK20190870]
- Program for New Century Excellent Talents of the University in China, China [NCET13-0645]
- Six Talent Plan [2015-XCL-030]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province
- Science and Technology Innovation Foster Foundation of Yangzhou University [XKYCX19_060]
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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.
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