Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 22nd May 2019 from 11:00 AM to 1:00 PM (GMT).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.



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

Author affiliations

Abstract

Solar fuel generation using seawater as the proton source is fascinating but challenging due to the detrimental chlorochemistry, the lack of active and stable oxygen evolution catalysts 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 the oxygen evolution reaction in both synthetic and natural seawater solutions were investigated. CaFeOx|FePO4 was prepared by electrodepositing FePO4 onto CaFeOx, prepared by spin-coating and a follow-up annealing process, under a 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 in solution pH, over 10 h of electrolysis in phosphate-buffered (0.5 M, pH 7) seawater solution.

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

Back to tab navigation

Supplementary files

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
Faraday Discuss., 2019, Advance Article

  •   Request permissions

    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., 2019, Advance Article , DOI: 10.1039/C8FD00172C

Search articles by author

Spotlight

Advertisements