Strengthening Bonding Interaction of a (Co 0.91 V 0.09 ) 3 (BTC) 2 Metal–Organic Framework with BiVO 4 Photoanodes Enabling Ultrastable Photoelectrochemical Water Oxidation

Although the oxygen evolution reaction (OER) activity of BiVO4 photoanodes has been significantly enhanced, achieving long-term photostability is still challenging due to the gradual dissolution of V5+ during photoelectrochemical (PEC) water splitting. Herein, we deliberately generate ligand defects in a (Co0.91V0.09)3(BTC)2 metal–organic framework (CoV-MOF) that creates more undercoordinated sites, forming strong chemical bonds with BiVO4. Consequently, the dissolution of V5+ from BiVO4 during PEC water splitting can be effectively suppressed, leading to significantly enhanced stability. The optimized Co3O4/CoV-MOF/BiVO4 photoanode exhibits a high photocurrent density of 6.0 mA cm–2 at 1.23 V vs the…

• NN
  National Natural Science Foundation of China

  Awards: 52372292, 62288102
• AR
  Australian Research Council

  Awards: DP230100621, FL190100139
• FR
  Fundamental Research Funds for the Central Universities
• SS
  Shenzhen Science and Technology Innovation Program

  Award: JCYJ20240813150835046