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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Aminopolysiloxane as Cu2O Photocathode Overlayer: Photocorrosion Inhibitor and Low Overpotential CO2-to-formate Selectivity Promoter

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Galante, Miguel T. [1, 2] ; Santiago, Patricia V. B. [1, 2] ; Yukuhiro, Victor Y. [1, 2] ; Silva, Leonardo A. [1, 2] ; Dos Reis, Natalia A. [1, 2] ; Pires, Cleo T. G. V. M. T. [1, 2] ; Macedo, Nadia G. [1, 2] ; Costa, Luelc S. [1, 2] ; Fernandez, Pablo S. [1, 2] ; Longo, Claudia [1, 2]
Total Authors: 10
[1] Univ Estadual Campinas, Inst Chem, BR-13083970 Campinas - Brazil
[2] Univ Estadual Campinas, Ctr Innovat New Energies, BR-13083841 Campinas - Brazil
Total Affiliations: 2
Document type: Journal article
Source: CHEMCATCHEM; v. 13, n. 3 DEC 2020.
Web of Science Citations: 0

Cu2O, a photoactive p-type semiconductor based on earth-abundant elements, shows promising features for photoelectrochemical CO2 reduction reaction (PEC CO2RR). However, despite the broad light absorption and appropriate conduction band edge energy, it promptly undergoes photocorrosion in PEC CO2RR conditions. Herein, we evaluate an amine-functionalized polysiloxane (AF-PSi) as both protective layer and PEC CO2RR promoter via amine-CO2 adduct formation. Electrochemistry experiments and X-ray diffraction showed that photostability is significantly enhanced with AF-PSi overlayer. Electrolyses experiments under visible light irradiation indicated selective production of formate with faradaic efficiency of 61 % at low overpotential. Detailed in situ FTIR studies revealed that amine groups bind to CO2 to form carbamate species and that this process is favoured by cathodic polarization, confirming the dual role of AF-PSi layer. (AU)

FAPESP's process: 18/20952-0 - Applied and fundamental studies of the electrochemical conversion of alcohols and CO2
Grantee:Pablo Sebastián Fernández
Support type: Program for Research on Bioenergy (BIOEN) - Regular Program Grants
FAPESP's process: 17/11986-5 - Research Division 1 - dense energy carriers
Grantee:Ana Flávia Nogueira
Support type: Research Grants - Research Centers in Engineering Program