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Self-Reconstructed Metal-Organic Framework Heterojunction for Switchable Oxygen Evolution Reaction.

Ling ZhangJiaji WangKe JiangZhaohui XiaoYuntian GaoShiwei LinBanglin Chen
Published in: Angewandte Chemie (International ed. in English) (2022)
Designing metal-organic framework (MOF)-based catalysts with superior oxygen evolution reaction (OER) activity and robust durability simultaneously is highly required yet very challenging due to the limited intrinsic activity and their elusive evolution under harsh OER conditions. Herein, a steady self-reconstructed MOF heterojunction is constructed via redox electrochemistry and topology-guided strategy. Thanks to the inhibiting effect from hydrogen bonds of Ni-BDC-1 (BDC=1,4-benzenedicarboxylic acid), the obatained MOF heterojunction shows greatly improved OER activity with low overpotential of 225 mV at 10 mA cm -2 , relative to the totally reconstructed Ni-BDC-3 (332 mV). Density function theory calculations reveal that the formed built-in electric field in the MOF heterojunction remarkably optimizes the ad/desorption free energy of active Ni sites. Moreover, such MOF heterojunction shows superior durability attributed to the shielding effect of the surface-evolved NiOOH coating.
Keyphrases
  • metal organic framework
  • solar cells
  • visible light
  • perovskite solar cells
  • signaling pathway
  • gene expression
  • molecular dynamics
  • wastewater treatment
  • single cell
  • electron transfer
  • highly efficient