Preparation of FTO/CU2O Electrode Protected by PEDOT:PSS and Its Better Performance in the Photoelectrocatalytic Reduction of CO2 to Methanol

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Abstract

Copper(I) oxide (Cu2O) was electrochemically deposited on fluorine-doped tin oxide (FTO) glass electrode and covered with a thin layer of poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS). The electrode was studied in the photoelectrocatalytic reduction of CO2. Methanol was obtained as the major product with a concentration of 460 μmol L−1 with a photoconversion yield of 12% after 60 min of reaction under the conditions of UV-Vis (125 W Hg high pressure lamp) and application of 0.0 V vs Ag/AgCl in 3.0 mol L−1 KCl in buffer sodium carbonate/sodium bicarbonate 0.1 mol L−1 saturated with CO2 gas. The PEDOT:PSS has led to a significant improvement in CO2 conversion due to rapid transfer of photogenerated holes. Consequently, the thin layer of PEDOT:PSS also reduces the photooxidation of Cu2O to CuO. The Cu2O/PEDOT:PSS photocatalytic system was found to have excellent photostability. Similar yield of alcohol was observed after reusing the catalyst six times.

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Funding

The authors are grateful for the financial support provided by the Ministerio de Educación (MINEDU) of Peru through of the agreement 401-2017-MINEDU of Perú, the Brazilian funding agencies FAPESP (#2015/18109-4, #2017/12790-7, and #2014/50945-1 INCT-DATREM), CNPq (#409792/2018-7), and CAPES. We are also indebted to GFQM-IQ for the X-ray diffraction measurements.

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Correspondence to Juliano Carvalho Cardoso.

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de la Cruz, P.T.S., Irikura, K., Lachgar, A. et al. Preparation of FTO/CU2O Electrode Protected by PEDOT:PSS and Its Better Performance in the Photoelectrocatalytic Reduction of CO2 to Methanol. Electrocatalysis 11, 546–554 (2020). https://doi.org/10.1007/s12678-020-00612-z

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Keywords

  • Photochemical stability
  • Formation of alcohols
  • Photoelectroreduction of CO2
  • Catalyst assembly