Journal
CHEMSUSCHEM
Volume 13, Issue 14, Pages 3662-3670Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202000784
Keywords
boron; cobalt; nickel; solid-state reactions; water splitting
Funding
- National Natural Science Foundation of China [21878201]
- Natural Science Foundation of Shanxi Province [201801D121059]
- Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province [RZ18100353]
- Shanxi Scholarship Council of China [2017-034]
- 7th Youth Talent Support Program of Shanxi Province, Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi OIT
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The development of highly active and efficient nonprecious-metal electrocatalysts for the oxygen evolution reaction is important for the design of renewable energy production and storage devices. In this work, highly dense, ultrathin Co-Ni boride nanoflakes supported on a 3 D CoNi skeleton are fabricated in situ by a simple one-step, high-temperature, solid-state boronation process. As a result of the induced high electroactive surface area and low charge transfer resistance, CoNiB-700 exhibits high catalytic activity at an overpotential of 262 (eta(10)) and 284 mV (eta(20)) to deliver current densities of 10 and 20 mA cm(-2), respectively, with a Tafel slope of 58 mV dec(-1) in an alkaline medium towards the oxygen evolution reaction. DFT calculations show that the Ni-regulated Co-B compound has a lower rate-determining energy barrier for the *OOH intermediate than the mono-Co-B compound, which facilitates the production of more active catalytic sites for an accelerated surface charge-transfer process for the oxygen evolution reaction.
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