Phosphorus and Selenium Co-Doped CoFe-Based Catalysts for Efficient Alkaline Overall Water Splitting

Authors:
  • YPYanchun Pang
    Yanchun Pang
  • HYHao Yi
    Hao Yi
  • XHXiaodong Hao
    Xiaodong Hao
  • WLWenzhong Li
    Wenzhong Li
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Abstract
Developing non-noble metal bifunctional catalysts with high stability and sustained activity is essential for alkaline water splitting. Herein, we report a cobalt-iron bimetallic phosphoselenide (P,Se-CoFe/NF) catalyst synthesized via a two-step approach combining hydrothermal growth and low-temperature phosphoselenization. The dual doping of phosphorus and selenium effectively modulates the electronic structure and enriches the active sites of the CoFe matrix, thereby enhancing the catalytic selectivity and activity for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Benefiting from these advantages, the P,Se-CoFe/NF catalyst delivers exceptional bifunctional performance in alkaline media: it requires only 205 mV and 141 mV overpotential to achieve a current density of 10 mA·cm-2 for OER and HER, respectively. Moreover, an overall water splitting cell using this catalyst as both anode and cathode attains 10 mA·cm-2 at a low voltage of 1.576 V. This work provides a feasible and efficient strategy for designing non-noble metal electrocatalysts toward practical alkaline water electrolysis.

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