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Published on: December 6, 2021
Highly graphited carbon-coated FeTiO3 nanosheets in situ derived from MXene: an efficient bifunctional catalyst for
Yingxinjie Wang1, Jie Zhu1, Yan Jiang1
1Key Laboratory of Cluster Science, Ministry of Education of China, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China. caomh@bit.edu.cn.
Abstract:
Developing high-efficiency and low-cost catalysts for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is of great significance for the commercialization of rechargeable metal-air batteries. Herein, we demonstrated the construction of graphited carbon-coated FeTiO3 (FeTiO3@C) via in situ annealing Ti3C2T nanosheets in a rusted-reactor and its efficient bifunctional activity for rechargeable Zn-air batteries (RZABs). The electron-transport dynamics of FeTiO3@C can be improved by using highly conductive graphited carbon derived from Ti3C2T. The FeTiO3@C catalyst annealed at 500 °C exhibits excellent OER and ORR activities. Specifically, FeTiO3@C shows a low overpotential of 323 mV at 10 mA cm-2 and a small Tafel slope of 53 mV dec-1 towards the alkaline OER. During the OER process, FeTiO3@C can be partially converted into highly active iron oxyhydroxide via in situ electrochemical reconstruction, which serves as the active species. After being assembled to RZABs, it shows an open-circuit potential of 1.33 V, a high trip efficiency of 63.4% and long-time cycling stability. This work can provide a new avenue for developing bifunctional electrocatalysts for RZABs used in portable devices.
