4.6 Article

Partial deligandation activated ZIF-67 for efficient electrocatalytic oxygen reduction reaction

Journal

FRONTIERS IN CHEMISTRY
Volume 10, Issue -, Pages -

Publisher

FRONTIERS MEDIA SA
DOI: 10.3389/fchem.2022.983549

Keywords

ZIF-67; activation; deligandation; low temperature; oxygen reduction reaction (ORR)

Funding

  1. National Natural Science Foundation of China
  2. 111 Project
  3. Henan Center for Outstanding Overseas Scientists
  4. Xinxiang major science and technology projects
  5. [51872075]
  6. [51922008]
  7. [52072114]
  8. [D17007]
  9. [GZS2022017]
  10. [21ZD001]

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This study successfully obtained ZIF-67-400 with excellent oxygen reduction reaction (ORR) performance using low-temperature pyrolysis. The material exhibits good stability and catalytic activity, comparable to commercial Pt/C. By eliminating hydrocarbon groups in the ligands, the active sites are exposed and coordinated with the intrinsic porosity, improving the catalytic performance. This work provides a new solution for activating the electrocatalytic performance of metal-organic frameworks through low-temperature annealing.
Removing the blocked molecular groups and fully exposing the intrinsic active sites of metal-organic frameworks (MOFs) could give full play to their advantages of multi-active sites and multi-channel mass transfer, which will benefit the electrocatalytic oxygen reduction reaction (ORR) in fuel cells. Here, the partial diligandation-activated ZIF-67 (named as ZIF-67-400) with excellent ORR performance was obtained by simple low-temperature pyrolysis. The ORR electrocatalytic activity exhibits a half-wave potential of 0.82 V and the stability of maintaining 96% activity after 10 h of operation, which is comparable to commercial Pt/C. Further research studies reveal that the morphology, special dodecahedron configuration, and crystal structure of ZIF-67-400 are maintained well during the pyrolysis, but some hydrocarbon groups in the ligands are eliminated, resulting in the active sites being exposed and coordinated with the intrinsic porosity, improving the catalytic performance. This work may provide an alternative path for activating the electrocatalytic performance of metal-organic frameworks by low-temperature annealing.

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