Tunable NiSe‐Ni 3 Se 2 Heterojunction for Energy‐Efficient Hydrogen Production by Coupling Urea Degradation

Abstract Urea‐assisted water splitting is a promising energy‐saving hydrogen (H 2 ) production technology. However, its practical application is hindered by the lack of high‐performance bifunctional catalysts for urea oxidation reaction (UOR) and hydrogen evolution reaction (HER). Herein, a heterostructured catalyst comprising highly active NiSe and Ni 3 Se 2 , along with a conductive graphene‐coated nickel foam skeleton (NiSe‐Ni 3 Se 2 /GNF) is reported. The heterostructured NiSe‐Ni 3 Se 2 originates from the in situ selenization of graphene‐coated nickel foam, allowing for careful regulation of the NiSe to Ni 3 Se 2 ratio by simply adjusting the calcination temperature. Theoretical calculations of the charge…

• NN
  National Natural Science Foundation of China

  Awards: 22469002, 22275166
• SS
  Shenzhen Science and Technology Innovation Program

  Award: JCYJ20230807112503008
• BA
  Basic and Applied Basic Research Foundation of Guangdong Province

  Award: 2024A1515012841
• FR
  Fundamental Research Funds for the Provincial Universities of Zhejiang

  Award: B2023002