A graphene-like nanoribbon for efficient bifunctional electrocatalysts
| Autor: | Pengru Huang, Hongliang Peng, Fen Xu, Lixian Sun, Chunfeng Shao, Yalin Liu, Jiaxi Liu, Yongjin Zou, Xiaogang Xue, Federico Rosei, Siyan Liu, Kexiang Zhang, Diancheng Duan, Xinlong Tian, Huanzhi Zhang |
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| Rok vydání: | 2021 |
| Předmět: |
Battery (electricity)
Materials science Renewable Energy Sustainability and the Environment Graphene chemistry.chemical_element General Chemistry Electrocatalyst Catalysis law.invention chemistry.chemical_compound chemistry Chemical engineering law General Materials Science Bifunctional Carbon Cobalt Graphene nanoribbons |
| Zdroj: | Journal of Materials Chemistry A. 9:26688-26697 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/d1ta06078c |
| Popis: | Graphene nanoribbons (GNRs) are conducive to full exposure of catalyst sites, which can be used to synthesize highly efficient electrocatalysts. However, the design of stable and efficient GNR catalysts remains a great challenge. Herein, a novel iron and cobalt co-doped carbon-based catalyst (C-MP-FeCo) with a GNR structure has been developed by a facile and one-step heat-treatment method. C-MP-FeCo is an excellent bifunctional electrocatalyst for low potential difference ΔE between the oxygen-evolution reaction and oxygen-reduction reaction (ΔEC-MP-FeCo = 0.70 V vs. ΔE(Pt/C+RuO2) = 0.765 V). The maximum power reached 331 mW cm−2 at 0.97 V for a Zn–air battery derived from the C-MP-FeCo catalyst, and with the Pt/C + RuO2 catalyst it was only 249 mW cm−2 at 0.89 V; also, better discharge performance, voltage efficiency and durability were delivered by the former catalyst. Our findings show that the main methods of increasing electrocatalytic activity are (1) forming GNRs and exposing active sites, and (2) exploiting the synergistic effects of Fe, Co, N, and F. |
| Databáze: | OpenAIRE |
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