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Surface reconstruction, doping and vacancy engineering to improve the overall water splitting of CoP nanoarrays

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Abstract

Development of a general regulatory strategy for efficient overall water splitting remains a challenging task. Herein, a simple, cost-fairness, and general fluorination strategy is developed to realize surface reconstruction, heteroatom doping, and vacancies engineering over cobalt phosphide (CoP) for acquiring high-performance bifunctional electrocatalysts. Specifically, the surface of CoP nanoarrays (NAs) becomes rougher, meanwhile F doped into CoP lattice and creating amounts of P vacancies by fluorination, which caused the increase of active sites and regulation of charge distribution, resulting the excellent electrocatalyst performance of F-CoP NAs/copper foam (CF). The optimized F-CoP NAs/CF delivers a lower overpotential of only 35 mV at 10 mA·cm−2 for hydrogen evolution reaction (HER) and 231 mV at 50 mA·cm−2 for oxygen evolution reaction (OER), and the corresponding overall water splitting requires only 1.48 V cell voltage at 10 mA·cm−2, which are superior to the most state-of-the-art reported electrocatalysts. This work provides an innovative and feasible strategy to construct efficient electrocatalysts.

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Acknowledgments

The work reported here was supported by the National Natural Science Foundation of China (Nos. 52072196, 52002199, 52002200, and 52102106), Major Basic Research Program of Natural Science Foundation of Shandong Province (No. ZR2020ZD09), the Natural Science Foundation of Shandong Province (Nos. ZR2019BEM042 and ZR2020QE063), the Innovation and Technology Program of Shandong Province (No. 2020KJA004), and the Taishan Scholars Program of Shandong Province (No. ts201511034). We express our grateful thanks to them for their financial support. The authors want to thank Shiyanjia Lab for the support of DFT calculations.

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Authors and Affiliations

  1. College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao, 266061, China

    Yongkai Sun

  2. College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China

    Wenyuan Sun, Lihong Chen, Guicun Li, Zhenhui Zhang & Zhenjiang Li

  3. Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China

    Alan Meng & Lei Wang

  4. School of Material Science and Engineering, International S & T Cooperation Foundation of Shaanxi Province, Xi’an Key Laboratory of Green Manufacture of Ceramic Materials, Shaanxi University of Science and Technology, Xi’an, 710021, China

    Jianfeng Huang

  5. Qingdao Huanghai University, Qingdao, 266000, China

    Aili Song

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  1. Yongkai Sun
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Sun, Y., Sun, W., Chen, L. et al. Surface reconstruction, doping and vacancy engineering to improve the overall water splitting of CoP nanoarrays. Nano Res. 16, 228–238 (2023). https://doi.org/10.1007/s12274-022-4702-y

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