Strong Electron Coupling Effect of Prussian Blue Analogs Derived Ultrathin Nitrogen-Doped Carbon Wrapped Fe-CoP for Enhanced Wide Spectrum Photocatalytic H2 Evolution

With the advantages of large specific surface area and high porosity of general metal-organic frame materials, russian blue analogs have broad application prospects in catalysis. In this work, a series of ultra-thin N-doped carbon coated Fe-CoP (Fe-CoP@NC) are prepared by phosphating Fe-Co-Co Prussian blue analogs (Fe-Co-Co PBA) in different degrees for the broad-spectrum photocatalytic hydrogen evolution. The results show that Fe-CoP@NC-3 has the highest photocatalytic hydrogen production rate of 16.6 mmol h⁻¹ g⁻¹, which is 83 times greater than that of Fe-Co-Co PBA. The excellent stability of Fe-CoP@NC-3 is proved by cyclic experiments. The outstanding photocatalytic H₂ production activity of Fe-CoP@NC-3 can be ascribed to the strong electron coupling effect between Fe-CoP and N-doped carbon layer. The photogenerated electrons of Fe-CoP are transferred to the N-doped carbon layer, which is electron transport mediator accelerating the electron transfer and synergetic improving the hydrogen evolution efficiency. This work provides an effective strategy for designing an ultra-thin N-doped carbon layer coated phosphide photocatalyst with strong electron coupling effect.