Journal
NANO RESEARCH
Volume 16, Issue 2, Pages 2224-2229Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-022-5006-y
Keywords
oxygen evolution reaction; electrocatalyst; corrosion; stability
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This paper proposes a simple method to synthesize efficient, stable, and durable iron-based catalysts for improving the oxygen evolution activity in water splitting for hydrogen production. The prepared catalysts showed low over-potential and long stability.
The anode activity can to a great degree limit the cathodic hydrogen evolution efficiency in an electrolyte cell. Thus, cost-efficient electrocatalysts with good water oxidation performance and stability are highly desired in widespread implementation of the hydrogen production from water splitting. This paper proposes a facile corrosion-reconstruction strategy to transform Fe surface into a Fe -Co hydroxide layer to improve the oxygen evolution activity. The as-prepared catalyst was measured to have an over-potentential as low as 320 mV at 100 mA.cm(-2), and its stability even exceeded 600 h. Surface and Raman spectroscopy analyses indicated that the catalyst experienced chemical changes from hydroxides to oxyhydroxides and Co2+ to Co3+ during oxygen evolution reaction (OER). The corrosion -reconstruction is not only an economical method to synthesize a highly efficient, stable and durable Fe-based catalysts, it also converses the detrimental corrosion into a beneficial catalyst fabrication process.
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