Hierarchical CoP/Ni ₅ P ₄ /CoP microsheet arrays as a robust pH-universal electrocatalyst for efficient hydrogen generation

Exceptional Pt-like electrocatalytic activity was achieved in a sandwich-like catalyst of CoP/Ni ₅ P ₄ /CoP microsheet arrays for pH-universal hydrogen evolution through simply wrapping Ni ₅ P ₄ nanosheet arrays in CoP nanoparticles.