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A dual-active Co-CoO heterojunction coupled with Ti3C2-MXene for highly-performance overall water splitting

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Abstract

Development of cost-effective and highly-efficient bifunctional hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) catalysts is crucial for overall water splitting in practical utilization. Herein, we proposed a novel non-noble metal bifunctional HER/OER electrocatalyst by synergistically coupling a dual-active Co-based heterojunction (Co-CoO) with high conductive and stable two-dimensional Ti3C2-MXene (defined as Co-CoO/Ti3C2-MXene). A series of characterizations and theoretical calculations verify that the synergistic effect of metallic Co with HER activity and CoO with OER performance leads to superb bifunctional catalytic performance, and Ti3C2-MXene can enhance electrical conductivity and prevent the aggregation of the Co-based catalysts, thereby improving both the activity and stability. Co-CoO/Ti3C2-MXene presents low onset potential (ηonset) of 8 mV and Tafel slope of 47 mV·dec−1 for HER (close to that of Pt/C) and ηonset of 196 mV and Tafel slope of 47 mV·dec−1 for OER (superior to that of RuO2). Assembled as an electrolyzer, Co-CoO/Ti3C2-MXene shows a low voltage of 1.55 V at 10 mA·cm−2, high Faradaic efficiency and remarkable stability. It can be driven by a solar cell of ∼ 1.55 V for consecutive production of hydrogen and oxygen gases.

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Acknowledgements

This research was supported by the National Key R&D Program of China (No. 2018YFB1502401), the National Natural Science Foundation of China (Nos. 21631004, 21805073, U20A20250, and 21901064), the Natural Science Foundation of Heilongjiang Province (No. QC2018014), the University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province (Nos. UNPYSCT-2017123 and UNPYSCT-2017124). the Basic Research fund of Heilongjiang University in Heilongjiang Province (No. RCYJTD201801), and Heilongjiang University Excellent Youth Foundation.

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  1. Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of China, Heilongjiang University, Harbin, 150080, China

    Dezheng Guo, Yanqing Jiao, Haijing Yan, Aiping Wu, Ganceng Yang, Yu Wang, Chungui Tian & Honggang Fu

  2. Department of Cardiovascular Medicine, Heilongjiang Provincial Hospital, Harbin, 150080, China

    Xin Li

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  1. Dezheng Guo
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  2. Xin Li
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Correspondence to Haijing Yan or Honggang Fu.

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Guo, D., Li, X., Jiao, Y. et al. A dual-active Co-CoO heterojunction coupled with Ti3C2-MXene for highly-performance overall water splitting. Nano Res. 15, 238–247 (2022). https://doi.org/10.1007/s12274-021-3465-1

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