화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.109, 413-421, May, 2022
DOI10.1016/j.jiec.2022.02.026  Export Citation
Hierarchical CoSx/graphene/carbon nanotube hybrid architectures for bifunctional electrocatalysts in zinc-air battery
Beum Jin Park1, Hongdae Lee1, Jiyoung Kim1, and Ho Seok Park1, 2, †
  • 1School of Chemical Engineering, College of Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
  • 2Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences and Technology (SAIHST), Sungkyunkwan University, Suwon 16419, Republic of Korea
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Herein, we report multidimensional hybrid architectures wherein CoS2 nanoparticles are encapsulated in steam-activated reduced graphene oxide/carbon nanotubes (CoSx@srGO/CNT) for rechargeable Zn-air batteries. CoSx nanoparticles work as catalysts to grow CNT branches onto the srGO, and the CoSx@srGO/CNT act as bifunctional electrocatalyst for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The bifunctional ORR and OER activities of the CoSx@srGO/CNT are substantially greater than those of CoS2, srGO, and CoSx@srGO as confirmed by onset potentials, Tafel and K-L plots, and mass activities. Zn-air batteries with CoSx@srGO/CNT catalyst achieved a specific capacity of 583 mAh·gzn -1 and maximum power density of 66.45 mW·cm-2, which are greater than Pt/C and IrO2 mixed catalyst, along with a long-term cyclability of over 100 cycles. The outstanding performance of CoSx@srGO/CNT is attributed to the abundant exposed active sites of CoSx on a unique 3D multidimensional graphene/CNT hybrid architecture and the rapid mass/charge transport for the enhanced bifunctional activities.
Keywords:Oxygen electrocatalyst;Zinc-air battery;Bifunctional catalyst;Multidimensional structure;Cobalt disulfide
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