Journal
COMPOSITES COMMUNICATIONS
Volume 23, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.coco.2020.100587
Keywords
Co9S8 polyhedrons; Graphene; Island-like architecture; Zinc-air battery
Categories
Funding
- Fundamental Research Funds for the Central Universities [CUSF-DH-D-2020046]
- Graduate Student Innovation Fund of Donghua University
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A bifunctional electrocatalyst, Co9S8-NSG, was successfully synthesized using a solvothermal strategy, showing excellent performance in both OER and ORR. The catalyst also exhibited high peak power density and outstanding cycling stability in a zinc-air battery application.
Exploring highly efficient and low-cost bifunctional electrocatalysts for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is significant for the development of renewable energy. Here, Co9S8 nanospheres with hollow structure anchored on N and S dual-doped graphene oxide (Co9S8-NSGO) are synthesized by solvothermal strategy. After pyrolyzed, advanced bifunctional electrocatalysts with feature of sea-island architecture of Co9S8 polyhedrons evenly dispersed on N and S co-doped graphene sheets (Co9S8-NSG) are obtained, in which Co9S8 polyhedrons stem from the derivative of Co9S8 nanospheres. Ascribed to large surface area, sea-island structure of uniform dispersion of Co9S8 nanoparticles on graphene, synergistic effect between Co9S8 and graphene and more active sites based N and S doping, the as-prepared Co9S8-NSG catalyst exhibits excellent OER performance with a small overpotential (240 mV at 10 mA cm(-2)) and satisfactory ORR performance with half-wave potential (0.79 V). Notably, a zinc-air battery using Co9S8-NSG as air cathode shows high peak power density (120 mW cm(-2)) and outstanding cycling stability (120 h at 10 mA cm(-2)).
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