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Mechanistic insight into the active centers of single/dual-atom Ni/Fe-based oxygen electrocatalysts

Journal Article · · Nature Communications
 [1];  [1];  [2];  [1];  [1];  [3];  [4];  [5];  [1]
  1. University of Zurich (Switzerland)
  2. Leshan Normal University (China)
  3. Empa, Swiss Federal Institute for Materials Science and Technology, Dübendorf (Switzerland)
  4. Diamond Light Source Ltd, Oxfordshire (United Kingdom); University of Oxford (United Kingdom)
  5. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Single-atom catalysts with maximum metal utilization efficiency show great potential for sustainable catalytic applications and fundamental mechanistic studies. We here provide a convenient molecular tailoring strategy based on graphitic carbon nitride as support for the rational design of single-site and dual-site single-atom catalysts. Catalysts with single Fe sites exhibit impressive oxygen reduction reaction activity with a half-wave potential of 0.89 V vs. RHE. We find that the single Ni sites are favorable to promote the key structural reconstruction into bridging Ni-O-Fe bonds in dual-site NiFe SAC. Meanwhile, the newly formed Ni-O-Fe bonds create spin channels for electron transfer, resulting in a significant improvement of the oxygen evolution reaction activity with an overpotential of 270 mV at 10 mA cm–2. We further reveal that the water oxidation reaction follows a dual-site pathway through the deprotonation of *OH at both Ni and Fe sites, leading to the formation of bridging O2 atop the Ni-O-Fe sites.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
2471714
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 12; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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