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Ultrathin amorphous MnO2 modified prawn shells-derived porous carbon towards robust oxygen electrocatalyst for rechargeable Zn-air battery.
- Source :
-
Ceramics International . Mar2022, Vol. 48 Issue 5, p6506-6511. 6p. - Publication Year :
- 2022
-
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]
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 48
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 155091605
- Full Text :
- https://doi.org/10.1016/j.ceramint.2021.11.195