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Se-Doping Activates FeOOH for Cost-Effective and Efficient Electrochemical Water Oxidation.

08:00 EDT 1st April 2019 | BioPortfolio

Summary of "Se-Doping Activates FeOOH for Cost-Effective and Efficient Electrochemical Water Oxidation."

Ni or Co is commonly required in efficient electrocatalysts for oxygen evolution reaction (OER). Although Fe is much more abundant and cheaper, full-Fe or Fe-rich catalysts suffer from insufficient activity. Herein, we discover that Se-doping can drastically promote OER on FeOOH and develop a facile on-site electrochemical activation strategy for achieving such Se-doped FeOOH electrode via FeSe pre-catalyst. Theoretical analysis and systematic experiments prove that Se-doping enables FeOOH as an efficient and low-cost OER electrocatalyst. By optimizing the electrode structure, an industrial-level OER current output of 500 mA cm-2 is secured at a low overpotential of 348 mV. The application of such a Fe-rich OER electrode in practical solar-driven water splitting system demonstrates a high and stable solar-to-hydrogen efficiency of 18.55%, making the strategy promising for exploring new cost-effective and highly active electrocatalysts for clean hydrogen production.

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This article was published in the following journal.

Name: Journal of the American Chemical Society
ISSN: 1520-5126
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