1. Ultrathin amorphous MnO2 modified prawn shells-derived porous carbon towards robust oxygen electrocatalyst for rechargeable Zn-air battery.
- Author
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Xiao, Xiao, Zhang, Wenzhi, Zhao, Hui, Li, Linfeng, Deng, Peichang, Wu, Yulian, Luo, Shuliang, and Chen, Beibei
- Subjects
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OXYGEN evolution reactions , *STORAGE batteries , *SHRIMPS , *ELECTRIC batteries , *ELECTRIC conductivity , *OXIDATION-reduction reaction , *METAL-air batteries , *OXYGEN - Abstract
Precious metal-free bifunctional electrocatalysts 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 MnO 2 modified prawn shells-derived porous carbon (U–MnO 2 /PSNC) is designed and synthesized via a self-template assisted pyrolysis coupling in-situ redox reaction strategy. In this composite, the ultrathin amorphous MnO 2 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–MnO 2 -0.01/PSNC delivers an excellent bifunctional to ORR/OER with a small ΔE (bifunctional activity parameter) value of 0.776 V. Moreover, the RZAB equipped with U–MnO 2 -0.01/PSNC displays a considerable stability with narrow decay of battery efficiency (1.10%) for ∼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. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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