Journal
ADVANCED MATERIALS
Volume 31, Issue 48, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201904548
Keywords
electronic coupling; hollow carbon matrices; oxygen evolution reaction; single-atom catalysis
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Funding
- National Research Foundation (NRF) of Singapore [NRF-NRFI2016-04]
- Ministry of Education of Singapore through Academic Research Fund (AcRF) Tier-1 Funding [M4011783, RG5/17]
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Exploring highly efficient electrocatalysts for the oxygen evolution reaction (OER) and unveiling their activity origin are pivotal for energy conversion technologies. Herein, atomically distributed Ni sites over a N-doped hollow carbon matrix are reported as a promising electrocatalyst for OER in alkaline conditions. Significantly boosted activity is observed after the decoration of the active Ni sites with well-controlled coordination geometry. Results of X-ray absorption spectroscopy investigation and density functional theory (DFT) calculation reveal that the effective electronic coupling via the Ni-N coordination can move down the Fermi level and lower the adsorption energy of intermediates, thus resulting in the facilitated OER kinetics.
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