Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 34, Pages 38202-38210Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c10734
Keywords
ZIF-67; Co9S8/graphene; bifunctional catalyst; double carbon; Zn-air battery
Funding
- National Natural Science Foundation of China [U1810110, 2192017]
- Key R&D Projects of Shanxi Province [201803D121030]
- Project of Science and Education Bureau of Salt Lake District of Shanxi Province
- Scientific and Technical Innovation Action Plan Hong Kong, Macao [19160760600]
- Taiwan Science and Technology Cooperation Project of Shanghai Science and Technology Committee [19160760600]
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Rational synthesis of bifunctional electrocatalysts with high performance and strong durability is highly demanded rechargeable metal-air battery. In this work, ZIF-derived Co9S8/C coated with conductive graphene nanosheet (Co9S8/GN) was synthesized by a simple solvothermal method and formed a stable double-carbon structure. As expected, the prepared Co9S8/GN catalyst exhibits a high catalytic activity (Delta E: 0.88 V) and long-term durability toward both oxygen reduction reaction and oxygen evolution reaction (ORR and OER), which is even superior to the Pt/C + Ir/C mixture (0.91 V). In addition, the Zn-air battery with the Co9S8/GN catalyst showed higher power density (186 mW cm(-2)) and more stable charge-discharge cycling performances (2000 cycles) than the Pt/C + Ir/C (118 mW cm(-2)). Based on these analysis results, the favorable catalytic performance of ORR/OER should be illustrated by the following reasons: (i) large specific surface area and unique mesoporous structure, providing abundant active sites; (ii) good conductivity, accelerating the electrons transfer; and (iii) the unique stable double-carbon structures (metal-S-C-C), preventing the agglomeration of metal sulfide, building new quick transfer pathway, and forming the strong electron coupling ability and synergistic effect.
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