Journal
JOURNAL OF CO2 UTILIZATION
Volume 57, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2022.101902
Keywords
Methanol; Carbon dioxide; Photoelectrocatalysis; Chalcopyrite; Solution-processed
Funding
- Sao Paulo Research Foundation, FAPESP [2018/02950-0, 2017/15144-9, 2018/26005-2, 2018/16401-8, 2014/50249-8, 2013/07296-2, 2017/11986-5]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brasil
- CAPES [001]
- Conselho Nacional de Pesquisa e Desenvolvimento, CNPq [465571/2014-0]
- INCT-DATREM [465571/2014-0]
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An all-solution approach was presented to fabricate nanocrystalline film of the ternary chalcopyrite for photoelectrochemical CO2 reduction. Despite interesting results, doping with In and Bi caused defects in the absorber layer, affecting the stability and performance of the photocathode in CO2 reduction. Meanwhile, the Mo/CuGaS2/CdS/TiO2 photocathode showed promising stability and reproducibility for CO2 reduction.
Considering the influence of carbon dioxide (CO2) on global warming, an all-solution approach is presented here to fabricate nanocrystalline film of the ternary chalcopyrite for the photoelectrochemical CO2 reduction. High-purity nanocrystalline catalysts CuGaS2, Cu(Ga,Bi)S-2, and Cu(Ga,In)S-2 were obtained by a facile and fast spray method using a molecular ink. Those semiconductors were evaluated in the photoelectrocatalytic CO2 reduction under illumination of 1 Sun (100 mW cm(-2) ) applying potentials from - 0.3 V to - 0.7 V vs Ag/AgCl. Methanol was identified as the major product, furthermore, 2 C and 3 C compounds were also identified. Despite the interesting results, doping with In and Bi caused the formation of defects in the absorber layer, probably inducing recombination mechanisms, thus, affecting the stability and the performance of the photocathode in the CO2 reduction. Meanwhile, Mo/CuGaS2/CdS/TiO2 photocathode showed promising stability and reproducibility for CO2 reduction under illumination (100 mW cm(-2)) for 240 min at - 0.7 V.
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