Mechanistic Insights on Ternary Ni 2− x Co x P for Hydrogen Evolution and Their Hybrids with Graphene as Highly Efficient and Robust Catalysts for Overall Water Splitting

Searching the high‐efficient, stable, and earth‐abundant electrocatalysts to replace the precious noble metals holds the promise for practical utilizations of hydrogen and oxygen evolution reactions (HER and OER). Here, a series of highly active and robust Co‐doped nickel phosphides (Ni 2− x Co x P) catalysts and their hybrids with reduced graphene oxide (rGO) are developed as bifunctional catalysts for both HER and OER. The Co‐doping in Ni 2 P and their hybridization with rGO effectively regulate the catalytic activity of the surface active sites, accelerate the charge transfer, and boost their superior catalytic activity. Density functional theory calculations show that the Co‐doped catalysts deliver the…

• NN
  National Natural Science Foundation of China

  Awards: 21201138, 21401148, 21543005
• MO
  Ministry of Science and Technology of the People's Republic of China
• NK
  National Key Research and Development Program of China
• FR
  Fundamental Research Funds for the Central Universities