Exploiting a High-Performance 'Double-Carbon' Structure Co9S8/GN Bifunctional Catalysts for Rechargeable Zn–Air Batteries
| Autor: | Shuhui Sun, Jinli Qiao, Qiaojuan Gong, Nengneng Xu, Xiaoling Sun, Yunxia Liang, Pengni Gong, Mingjie Wu |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Graphene Oxygen evolution 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis Bifunctional catalyst law.invention chemistry.chemical_compound Chemical engineering chemistry law Specific surface area General Materials Science 0210 nano-technology Mesoporous material Bifunctional Nanosheet |
| Zdroj: | ACS Applied Materials & Interfaces. 12:38202-38210 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.0c10734 |
| Popis: | 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 (ΔE: 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. |
| Databáze: | OpenAIRE |
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