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Iron phosphate modified calcium iron oxide as an efficient and robust catalyst in electrocatalyzing oxygen evolution from seawater

Abstract

Solar fuel generation using seawater as the proton source is fascinating but challenging due to the detrimental chlorochemistry and lack of active and stable oxygen evolution catalyst operating at seawater pH (~8) and high turnover conditions. In the present study, iron phosphate modified calcium iron oxide (CaFeOx|FePO4) modified FTO electrodes were prepared, and their electrocatalytic properties towards oxygen evolution reaction in both synthetic and nature seawater solutions were investigated. CaFeOx|FePO4 was prepared by electrodepositing FePO4 onto CaFeOx, prepared by spin-coating and a follow-up annealing process, under constant applied current for different durations. Mg2+-induced fouling significantly reduces the activity of CaFeOx and slows down the activation process of CaFeOx, but can be mitigated by surface-modification of CaFeOx with FePO4. In addition, the presence of additional electrodeposited iron phosphate on the surface of CaFeOx attenuates the production of corrosive hypochlorite from chloride oxidation. With these unique properties of FePO4, the activated CaFeOx|FePO4 electrode shows high activity and stability under high turnover conditions, reaching 10 mA cm−2 at an overpotential of ~710 mV, with a moderate increase in η (∼70 mV), mainly due to the change of solution pH, over 10 h electrolysis in phosphate buffered (0.5 M, pH 7) seawater solution.

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Publication details

The article was received on 12 Nov 2018, accepted on 05 Dec 2018 and first published on 05 Dec 2018


Article type: Paper
DOI: 10.1039/C8FD00172C
Citation: Faraday Discuss., 2018, Accepted Manuscript
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    Iron phosphate modified calcium iron oxide as an efficient and robust catalyst in electrocatalyzing oxygen evolution from seawater

    W. Huang and C. Lin, Faraday Discuss., 2018, Accepted Manuscript , DOI: 10.1039/C8FD00172C

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