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Boride-derived oxygen-evolution catalysts
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DOI：10.1038/s41467-021-26307-7.png)
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Abstract
En 中文
Metal borides/borates are promising candidates to become high-performance alkaline oxygen evolution reaction catalysts. This study reports an in-situ phase composition modulation approach to fabricate boride/borate-based catalysts. Metal borides/borates have been considered promising as oxygen evolution reaction catalysts; however, to date, there is a dearth of evidence of long-term stability at practical current densities. Here we report a phase composition modulation approach to fabricate effective borides/borates-based catalysts. We find that metal borides in-situ formed metal borates are responsible for their high activity. This knowledge prompts us to synthesize NiFe-Boride, and to use it as a templating precursor to form an active NiFe-Borate catalyst. This boride-derived oxide catalyzes oxygen evolution with an overpotential of 167 mV at 10 mA/cm(2) in 1 M KOH electrolyte and requires a record-low overpotential of 460 mV to maintain water splitting performance for over 400 h at current density of 1 A/cm(2). We couple the catalyst with CO reduction in an alkaline membrane electrode assembly electrolyser, reporting stable C2H4 electrosynthesis at current density 200 mA/cm(2) for over 80 h.
Keywords:
TOTAL-ENERGY CALCULATIONS
HIGHLY EFFICIENT
BIFUNCTIONAL ELECTROCATALYSTS
MOLECULAR-DYNAMICS
WATER OXIDATION
ELECTROLYSIS
NANOSHEETS
REDUCTION
SCHEMES
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