Journal
CERAMICS INTERNATIONAL
Volume 48, Issue 5, Pages 6506-6511Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.11.195
Keywords
Zn-air battery; Oxygen electrocatalyst; Shrimp shells-derived porous carbon; Amorphous MnO2
Categories
Funding
- National Nature Science Foundation of China [31901330]
- Innovative Youth Talents of Guangdong Education Department Support Program [2021KQNCX027]
- Youth Innovative Talents Project of Zhanjiang [2021E05016]
- Research Foundation for Advanced Talents of Guangdong Ocean University [060302122010]
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In this study, ultrathin amorphous MnO2 modified prawn shells-derived porous carbon was synthesized as a bifunctional electrocatalyst for ORR and OER. The composite exhibited excellent catalytic performance and high stability in a rechargeable Zn-air battery.
Precious metal-free bifunctional electmcatalysts with efficient performance to ORR (oxygen reduction reaction) and OER (oxygen evolution reaction) are the prerequisite to the commercialization of rechargeable Zn-air battery (RZAB). Here, ultrathin amorphous MnO2 modified prawn shells-derived porous carbon (U-MnO2/PSNC) is designed and synthesized via a self-template assisted pyrolysis coupling in-situ redox reaction strategy. In this composite, the ultrathin amorphous MnO2 provides high surface defects and homogeneous catalytic active sites. The conductive prawn shells-derived porous carbon displays macro-meso-microporous structure, promoting electric conductivity and offering fast pathway for mass diffusion. With optimized composition, the U-MnO2-0.01/PSNC delivers an excellent bifunctional to ORR/OER with a small Delta E (bifunctional activity parameter) value of 0.776 V. Moreover, the RZAB equipped with U-MnO2-0.01/PSNC displays a considerable stability with narrow decay of battery efficiency (1.10%) for similar to 334 h (500 cycles) at 10 mA cm(-2). This work enlightens a new pathway to design cost-effective bifunctional electrocatalysts for metal-air battery.
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