Photoelectrochemical Reduction of Carbon Dioxide on Quantum-Dot-Modified Electrodes by Electric Field Directed Layer-by-Layer Assembly Methodology.
The photoelectrocatalytic reduction of CO2 on ITO-modified electrodes, with electrostatic assemblies (polycations/quantum dots) (polycations=poly diallyldimethylammonium, PDDA, and poly(2-trimethylammonium)ethyl methacrylate, PMAEMA)), is described in the present work. Nanoparticles of CdTe (5.6 nm) were incorporated through an electric field directed layer-by-layer assembly method on ITO electrodes. Modified surfaces were active toward the reduction of CO2 at -400 mV vs Ag/AgCl; the activity of ITO-(PMAEMA/QDs)6 electrodes was enhanced by 300 mV under irradiation conditions. The photoelectrocatalytic effect was associated with the structure of the polycation and its influence in the assembly. Reaction products at -450 mV were H2, CO, CH3OH, and HCOH.
Facultad de Química, Pontificia Universidad Católica de Chile , Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile.
Diego
D
Guzmán
Facultad de Química, Pontificia Universidad Católica de Chile , Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile.
Mauricio
M
Isaacs
Facultad de Química, Pontificia Universidad Católica de Chile , Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile.
Igor
I
Osorio-Román
Facultad de Química y Biología, Universidad de Santiago de Chile , Libertador Bernardo O'Higgins 3363, 9170022 Santiago, Chile.
Macarena
M
García
Facultad de Química y Biología, Universidad de Santiago de Chile , Libertador Bernardo O'Higgins 3363, 9170022 Santiago, Chile.
Jason
J
Astudillo
Facultad de Química, Pontificia Universidad Católica de Chile , Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile.
Macarena
M
Ohlbaum
carbon dioxide; layer-by-layer; photoelectrochemical reduction; polycations; quantum dots