Selective CO production in photoelectrochemical reduction of CO2 with a cobalt chlorin complex adsorbed on multiwalled carbon nanotubes in water

Shoko Aoi, Kentaro Mase, Kei Ohkubo, Tomoyoshi Suenobu, Shunichi Fukuzumi

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38 Scopus citations

Abstract

Photoelectrochemical reduction of CO2 occurred using cobalt(II) chlorin (CoII(Ch)) as a cathode active material adsorbed on multiwalled carbon nanotubes as a current collector in combination with a surface-modified BiVO4 photoanode with iron(III) oxide(hydroxide), FeO(OH), to produce CO with 83% Faradaic efficiency at an applied bias voltage of -1.3 V at the CoII(Ch)-modified cathode vs the FeO(OH)/BiVO4/FTO photoanode under visible light irradiation in a CO2-saturated aqueous solution (pH 4.6). The difference in the oxidation potential of the FeO(OH)/BiVO4/FTO electrode under dark and that under light illumination was ∼1.5 V, which was smaller than the band gap of BiVO4 (band gap energy ≈ 2.4 eV), indicating that the FeO(OH)/BiVO4/FTO photoanode lowered the total bias that enabled simultaneous water oxidation and CO2 reduction.

Original languageEnglish
Pages (from-to)532-536
Number of pages5
JournalACS Energy Letters
Volume2
Issue number3
DOIs
StatePublished - 10 Mar 2017

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© 2017 American Chemical Society.

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