Co-doped NiP2as an efficient and robust bifunctional electrocatalyst for overall water splitting in alkaline electrolytes and seawater


Hao X. Sun Q. Zhang T. Song P. Guo J. Peshaya S. Chen L. Huang X. Liu X.
2026Royal Society of Chemistry

Green Chemistry
2026

The development of efficient and durable bifunctional electrocatalysts is crucial for overall water splitting in alkaline electrolytes/seawater, but these electrocatalysts face the dual challenges of unbalanced reaction kinetics and insufficient operational durability. Herein, we report a Co-doped NiP2 catalyst (Co8-NiP2) that achieves remarkable bifunctional performance and durability for overall water splitting. The Co8-NiP2 electrolyzer requires low cell voltages of only 1.54 V in 1 M KOH and 1.56 V in alkaline seawater at 10 mA cm−2 and maintains operation for over 500 h at 300 mA cm−2 with negligible degradation. Density functional theory (DFT) calculations revealed that optimal Co doping modulates the electronic structure of NiP2 by downshifting the Ni d-band center to simultaneously enhance the kinetics of both the hydrogen and oxygen evolution reactions. Moreover, the high Cl* adsorption energy on Co8-NiP2 ensures excellent durability in seawater environments. This work further establishes the correlation between the seawater concentration and the performance, defining its operational limits in relation to structural stability and performance. This study provides valuable insights into the electronic-structure regulation strategy for designing efficient and stable electrocatalysts suitable for complex real-world applications. This journal is



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State Key Laboratory of Solidification Processing, Centre of Advanced Lubrication and Seal Materials, Northwestern Polytechnical University, Xian, 710072, China
Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai, Yantai, 264006, China
Key Laboratory of Rare Earths, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou, 710043, China
Al-Farabi Kazakh National University, Faculty of Physics and Technology, Almaty, 050040, Kazakhstan
China National Petroleum Corporation Qinghai Oilfield Branch, Qinghai, 817500, China

State Key Laboratory of Solidification Processing
Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai
Key Laboratory of Rare Earths
Al-Farabi Kazakh National University
China National Petroleum Corporation Qinghai Oilfield Branch

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Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026