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Integrated Co4MnFe3/Ti3C2: Componential and Structural Engineering toward Boosting Electrocatalytic Oxygen Evolution

Chengqiang Gan,Yichi Zhang,Zhuangzhuang Liu,Wenya Yan,Qianqian Jiang,Xiaodong Wu,Jianguo Tang

Compared with traditional two-dimensional layered materials, MXene with metal-like conductivity has excellent chemical reaction activity and hydrophilicity, which can be used as ideal substrate materials. Nanocomposites with the non-noble metal based on MXene have important application prospects in the field of electrocatalytic decomposition of water. In this study, Co4MnFe3/Ti3C2 has been successfully synthesized only by the one-step method and prepared using ultrathin two-dimensional layered Ti3C2 as substrate materials, which is much more convenient than most electrocatalyst hybridization. The hybrid exhibits excellent electrochemical performance in alkaline media with an overpotential of 263 mV and Tafel slope of 26.3 mV·dec–1, which is much lower than that of its pure Co4MnFe3 counterparts and RuO2 catalyst in alkaline medium. When the current density reaches 10 mA/cm2, excellent long-range stability is displayed. Meanwhile, a fast reaction kinetics can also be obtained. Furthermore, density functional theory calculations reveal that, due to electron interactions and d-band center of metals, the enhanced density of states in the vicinity of the Fermi level has great influence on the oxygen evolution reaction property of the electrocatalyst via adjusting the adsorption strength of intermediates, which can improve the electrocatalytic performance of the hybrid. More importantly, this work provides a new approach for the electrolytic water oxygen evolution reaction of MXene-based catalysts in alkaline media and shed light on the exploration of advanced electrocatalysts for renewable energy conversion and storage systems.