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

doi:10.1021/acsenergylett.6b00630

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

Chemistry & Nanoscience

Research output: Contribution to journal › Article › peer-review

37 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 Co^II(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 language	English
Pages (from-to)	532-536
Number of pages	5
Journal	ACS Energy Letters
Volume	2
Issue number	3
DOIs	https://doi.org/10.1021/acsenergylett.6b00630
State	Published - 10 Mar 2017

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10.1021/acsenergylett.6b00630

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@article{b6ad07e496c543178fd9af00432ced81,

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

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.",

author = "Shoko Aoi and Kentaro Mase and Kei Ohkubo and Tomoyoshi Suenobu and Shunichi Fukuzumi",

note = "Funding Information: This work was supported by Grants-in-Aid (No. 16H02268 to S.F., Nos. 26620154 and 26288037 to K.O., No. 16K05721 to T.S.) and a JSPS fellowship (No. 25 727 to K.M.) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) and ALCA and SENTAN projects from JST, Japan (to S.F. and T.S). Photoelectrochemical studies especially on the potential difference between the FeO(OH)/BiVO4/ FTO anode and the SCE reference electrode were technically supported by Prof. Ken-ichi Nakayama at Osaka University and were financially supported by Grants-in-Aid (No. 25288113 to K.N.) from MEXT. Publisher Copyright: {\textcopyright} 2017 American Chemical Society.",

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T1 - Selective CO production in photoelectrochemical reduction of CO2 with a cobalt chlorin complex adsorbed on multiwalled carbon nanotubes in water

AU - Aoi, Shoko

AU - Mase, Kentaro

AU - Ohkubo, Kei

AU - Suenobu, Tomoyoshi

AU - Fukuzumi, Shunichi

N1 - Funding Information: This work was supported by Grants-in-Aid (No. 16H02268 to S.F., Nos. 26620154 and 26288037 to K.O., No. 16K05721 to T.S.) and a JSPS fellowship (No. 25 727 to K.M.) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) and ALCA and SENTAN projects from JST, Japan (to S.F. and T.S). Photoelectrochemical studies especially on the potential difference between the FeO(OH)/BiVO4/ FTO anode and the SCE reference electrode were technically supported by Prof. Ken-ichi Nakayama at Osaka University and were financially supported by Grants-in-Aid (No. 25288113 to K.N.) from MEXT. Publisher Copyright: © 2017 American Chemical Society.

PY - 2017/3/10

Y1 - 2017/3/10

N2 - 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.

AB - 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.

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