The synthesized catalyst demonstrates improved water splitting performance in both seawater and basic solutions, suggesting wide applicability for renewable energy solutions.
Developing an outperformed bifunctional water splitting catalyst serving in both basic solutions and seawater is of great significance. Herein, we synthesized the binder-free copper mesh (CM)-based Pt–Cu3P/Cu3(PO4)2 through two-step reaction courses. The achieved Pt–Cu3P/Cu3(PO4)2/CM (abbreviated as Pt–Cu3P/CPO/CM) has the appearance of nanosheets decorated with uniformly distributed nanoclusters. Electrochemical testing results confirm its Pt/C/CM-like hydrogen evolution reaction (HER) behavior and superior to RuO2/CM oxygen evolution reaction (OER) activity. In addition, to deliver a 10 mA cm–2 current density, the acquired voltage of Pt–Cu3P/CPO/CM is only 1.653 V in basic solutions and 1.676 V in seawater, even lower than the Pt/C/CM-RuO2/CM electrode pair (1.668 V) in the basic solutions. Further insight analysis certifies that the in situ-formed Pt–Cu3P/CPO heterojunction, together with the enlarged electrochemical surface-active area and the shortened charge transfer resistance, hugely improved the electrocatalytic property of Pt–Cu3P/CPO/CM. This work not only obtains an excellent self-supported bifunctional catalyst but also provides a material design idea to other Cu3(PO4)2-based catalysts.
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Wang et al. (2025) studied this question.
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