Photoelectrochemical Reduction of CO<sub>2</sub> to CO Using a CuGaS<sub>2</sub> Thin-film Photocathode Prepared by a Spray Pyrolysis Method

Ikeda, Shigeru; Tanaka, Yuta; Kawaguchi, Takato; Fujikawa, Shotaro; Harada, Takashi; Takayama, Tomoaki; Iwase, Akihide; Kudo, Akihiko

doi:10.1246/cl.180720

Cited by 16 publications

(16 citation statements)

References 38 publications

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“…Impacts of Surface Modification to the Cu 2 ZnGeS 4 Film. In our previous studies on CuGaS 2 -based photocatalytic and PEC CO 2 reduction systems, 19,49 CuGaS 2 powders and films without any modifications were used; there is no example of a successful impact on CO 2 reduction being achieved by loading of a noble metal catalyst. Thus, several trials to enhance activity for PEC CO 2 reduction by loading of metallic Au or Ag on the surface of the CZGS_540 thin film on Moglass were carried out.…”

Section: Acs Applied Energy Materialsmentioning

confidence: 99%

“…In this study, we aimed to fabricate a phase-pure CZGS thin film through a facile spray pyrolysis technique as reported previously for fabrication of several p-type compound thin films such as CZTS ,,, and Cu(In,Ga)(Se,S) 2 . − Structural, electric, and solar cell properties of thus-obtained CZGS thin films were examined. We then demonstrated for the first time the PEC performance for CO 2 reduction using the CZGS thin film.…”

Section: Introductionmentioning

confidence: 99%

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Photocathode Characteristics of a Spray-Deposited Cu₂ZnGeS₄ Thin Film for CO₂ Reduction in a CO₂-Saturated Aqueous Solution

Ikeda

Fujikawa

Harada

et al. 2019

ACS Appl. Energy Mater.

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A kesterite Cu2ZnGeS4 (CZGS) thin film was prepared on an Mo-coated glass substrate by spray deposition of an aqueous solution containing constituent elements followed by heat treatment in a sulfur atmosphere. The results of analysis of the ionization potential of the CZGS thin film by photoelectron spectroscopy (PES) and the external quantum efficiency (EQE) spectrum of a solar cell device based on the CZGS thin film showed that this compound had ca. 0.7 eV more negative conduction band minimum (CBM) than that of the well-studied kesterite Cu2ZnSnS4 (CZTS) but had almost the same energy level of the valence band maximum (VBM) as that of CZTS. Owing to the relatively shallow CBM, the CZGS film worked as a photocathode for photoelectrochemical (PEC) CO2 reduction in a neutral aqueous solution (0.1 M KHCO3) saturated with CO2 by applying a bias potential lower than that for inducing the reaction under a dark condition, whereas the CZTS film could not work under the same condition. Enhancement of PEC CO2 reduction activity by surface coverage of the CZGS thin film with a ZnS layer is also discussed on the basis of the electronic structure of the thus-formed CZGS–ZnS interface.

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Section: Acs Applied Energy Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photocathode Characteristics of a Spray-Deposited Cu₂ZnGeS₄ Thin Film for CO₂ Reduction in a CO₂-Saturated Aqueous Solution

Ikeda

Fujikawa

Harada

et al. 2019

ACS Appl. Energy Mater.

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“…58 It showed a very high photocurrent of 10 mA/cm 2 at −0.4 V vs RHE under solar light illumination and ∼60% faradaic efficiency for formic acid. CuGaS 2 as a new photocathode material was introduced by Ikeda et al 59 However, this material is not highly stable and needs to be improved, but this type of material is helpful to reduce overpotential for CO 2 reduction. Photoanode-Photocathode Based PEC System.…”

Section: Acs Sustainable Chemistry and Engineeringmentioning

confidence: 99%

General Review on the Components and Parameters of Photoelectrochemical System for CO₂ Reduction with in Situ Analysis

Pawar

Kim

Nguyen-Le

et al. 2019

ACS Sustainable Chem. Eng.

100

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One of the promising renewable energy sources is converting CO2 into useful chemical fuels; it will help to overcome both energy supply and global warming issues. Among various methods for CO2 reduction, photoelectrochemical (PEC) CO2 conversion is the most promising and easy method so far because it can be useful to control thermodynamics and kinetics of CO2 reduction reaction for product selectivity and fast reaction kinetics by mimicking natural photosynthesis without high input energy cost. However, it has some limitation factors that create difficulties for widespread utilization. The detection of CO2 products and intermediates on a small scale is another challenging part in this field. The small amount of the CO2 product can be further oxidized or evaporated, which could be difficult to be detected. Therefore, an in situ technique is a good approach to study the proper reduction mechanism during the CO2 reduction process. This review starts with basic concept of solar to fuel (STF) conversion by CO2 reduction and covers various aspects related to photoelectrochemical CO2 reduction. This main theme is completely depending on important parameters such as photoanode materials, photocathode materials, electrolyte solutions for photoelectrochemical CO2 reduction with the most important in situ measurement techniques for product analysis.

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“…We attempted to construct a photocathode specied to water reduction by applying appropriate surface modications 2,4,7,16 to the CuGaSe 2 wafer-based electrode. Fig.…”

Section: Pec Water Reduction Propertiesmentioning

confidence: 99%

“…3 As an another typical system among the PEC energy conversion system, we have proved the applicability of S-based wide-gap chalcopyrite CuGaS 2 for PEC reduction of carbon dioxide (CO 2 ). 4 However, all of these widegap-chalcopyrite-based PEC systems reported did not reach the necessary level for applying a realistic system and thereby recent studies on these PEC systems have also focused on developments of several candidates other than these chalcopyrite materials. 5 For the application of chalcopyrite and related materials to PEC systems, thin lm forms are usually utilized.…”

Section: Introductionmentioning

confidence: 99%

Preparation of a CuGaSe₂single crystal and its photocathodic properties

et al. 2020

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Photoelectrochemical Reduction of CO₂ to CO Using a CuGaS₂ Thin-film Photocathode Prepared by a Spray Pyrolysis Method

Cited by 16 publications

References 38 publications

Photocathode Characteristics of a Spray-Deposited Cu₂ZnGeS₄ Thin Film for CO₂ Reduction in a CO₂-Saturated Aqueous Solution

Photocathode Characteristics of a Spray-Deposited Cu₂ZnGeS₄ Thin Film for CO₂ Reduction in a CO₂-Saturated Aqueous Solution

General Review on the Components and Parameters of Photoelectrochemical System for CO₂ Reduction with in Situ Analysis

Preparation of a CuGaSe₂single crystal and its photocathodic properties

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Photoelectrochemical Reduction of CO2 to CO Using a CuGaS2 Thin-film Photocathode Prepared by a Spray Pyrolysis Method

Cited by 16 publications

References 38 publications

Photocathode Characteristics of a Spray-Deposited Cu2ZnGeS4 Thin Film for CO2 Reduction in a CO2-Saturated Aqueous Solution

Photocathode Characteristics of a Spray-Deposited Cu2ZnGeS4 Thin Film for CO2 Reduction in a CO2-Saturated Aqueous Solution

General Review on the Components and Parameters of Photoelectrochemical System for CO2 Reduction with in Situ Analysis

Preparation of a CuGaSe2single crystal and its photocathodic properties

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Photoelectrochemical Reduction of CO₂ to CO Using a CuGaS₂ Thin-film Photocathode Prepared by a Spray Pyrolysis Method

Photocathode Characteristics of a Spray-Deposited Cu₂ZnGeS₄ Thin Film for CO₂ Reduction in a CO₂-Saturated Aqueous Solution

Photocathode Characteristics of a Spray-Deposited Cu₂ZnGeS₄ Thin Film for CO₂ Reduction in a CO₂-Saturated Aqueous Solution

General Review on the Components and Parameters of Photoelectrochemical System for CO₂ Reduction with in Situ Analysis

Preparation of a CuGaSe₂single crystal and its photocathodic properties