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

Autor(es)

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]}

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Chem, BR-13083970 Campinas - Brazil

^[2] Univ Estadual Campinas, Ctr Innovat New Energies, BR-13083841 Campinas - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CHEMCATCHEM; v. 13, n. 3 DEC 2020.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 18/20952-0 - Estudos fundamentais e aplicados sobre conversão eletroquímica álcoois e CO2
• Beneficiário: Pablo Sebastián Fernández
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Regular
• Processo FAPESP: 17/11986-5 - Geração e Armazenamento de Novas Energias: trazendo desenvolvimento tecnológico para o país
• Beneficiário: Ana Flávia Nogueira
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia