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Efficient ORR catalyst: porous activated carbon prepared from water hyacinth with high N content

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Abstract

Oxygen reduction reaction (ORR) is an important reaction process that occurs at the cathode of zinc-air batteries. An efficient reaction process is conducive to further research on sustainable energy devices. In order to improve the reaction speed, the ORR electrocatalyst containing uniform Fe–N-C sites in a porous carbon network similar to the shape of moth-eaten rotten wood was prepared using water hyacinth with a thin-layer structure inside as a template. Water hyacinth, plays a variety of synthetic functions in the construction of nanocatalysts, not only has a good enrichment effect on metal elements, but also is rich in N element. The doped Fe elements combine with the carbon and N elements of water hyacinth to form Fe–N-C active sites. The half-wave potential of SHL-Fe-HMNC is raised to 0.881 V (0.838 V for commercial 20wt% Pt/C) compared to the reversible hydrogen electrode (RHE). The power density of the liquid battery prepared based on SHL-Fe-HMNC reaches 110 mW·cm−2 (90 mW·cm−2 for 20 wt% Pt/C). Furthermore, the cycle time of ZABs exceeds 200 h. The flexible battery based on SHL-Fe-HMNC has a cycle stability of more than 10 h at a current of 10 mA·cm−2, and the open circuit voltage (OCV) reaches 1.511 V.

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Acknowledgements

This work was financed by the Natural Science Research Project of Anhui Educational Committee (Grant No. KJ2020A0328) and the National Natural Science Foundation of China (Grant No.51502005).

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Natural Science Research Project of Anhui Educational Committee,KJ2020A0328,yang li,National Natural Science Foundation of China,51502005,yang li

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  1. School of Mechanics and Photoelectric Physics, Anhui University of Science and Technology, Huainan, 232001, People’s Republic of China

    Zijian Zhu, Yang Li, Xiaofei Li, Huiming Qiu, Lei Fang, Lingcheng Zheng & Juan Gao

  2. Key Laboratory of Spin Electron and Nanomaterials of Anhui Higher Education Institutes School of Chemistry and Chemical Engineering, Suzhou University, Suzhou, 234000, People’s Republic of China

    Guang Zhu

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Zhu, Z., Li, Y., Li, X. et al. Efficient ORR catalyst: porous activated carbon prepared from water hyacinth with high N content. J Nanopart Res 26, 93 (2024). https://doi.org/10.1007/s11051-024-06005-3

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