Electrochemical preparation of Cu/Cu2O-Cu(BDC) metal-organic framework electrodes for photoelectrocatalytic reduction of CO2

Autor(es)

Silva, Beatriz Costa e ^{[1, 2]} ; Irikura, Kallyni ^{[1, 2]} ; Silva Flor, Jader Barbosa ^[1] ; Menezes dos Santos, Rodrigo Morais ^[1] ; Lachgar, Abdessadek ^[3] ; Galvao Frem, Regina Celia ^[1] ; Boldrin Zanoni, Maria Valnice ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ, Inst Chem, UNESP, Araraquara 55 Prof Francisco Degni St, BR-14800060 Araraquara, SP - Brazil

^[2] Sao Paulo State Univ, Natl Inst Alternat Technol Detect Toxicol Evaluat, Inst Chem, UNESP, BR-14800060 Araraquara, SP - Brazil

^[3] Wake Forest Univ, Dept Chem, Winston Salem, NC 27109 - USA

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF CO2 UTILIZATION; v. 42, DEC 2020.
• Citações Web of Science: 0

Resumo

Thin films of the metal-organic framework (MOF) Cu(BDC) were electrochemically grown by anodic deposition of the ligand 1,4-benzenedicarboxylate (1,4-BDC) on metallic copper to form Cu/Cu2O-Cu(BDC) electrode. The construction of the electrode was optimized by investigating parameters such as current density, time of anodization, and temperature that directly affect its stability and photoactivity. The best performing electrode was prepared when a current density of 2.5 mA cm(-2) was applied for 6.5 min at 110 degrees C. A methanol concentration of 234 mu mol L-1 was produced from the photoelectron reduction of CO2 under UV-vis irradiation for 3 h, an applied potential of +0.10 V, and 0.1 mol L-1 aqueous sodium sulfate solution saturated with CO2 as supporting electrolyte. The rate of CO2 reduction to methanol was found to be similar to 20 times that obtained using Cu/Cu2O electrode alone presumably due to preconcentration of dissolved CO2 in the MOF. The capture of CO2 in the MOF surface and/or cavities was confirmed by ATR and DRIFT spectroscopy. (AU)

• Processo FAPESP: 17/12790-7 - Preparação e caracterização de eletrodos nanoestruturados de TiO2 modificados com estruturas metal orgânico (MOFs) para a aplicação na pré-concentração e redução de CO2
• Beneficiário: Kallyni Irikura
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 14/50945-4 - INCT 2014: Instituto Nacional de Tecnologias Alternativas para Detecção, Avaliação Toxicológica e Remoção de Micropoluentes e Radioativos
• Beneficiário: Maria Valnice Boldrin
• Modalidade de apoio: Auxílio à Pesquisa - Temático