Electrocatalytic Reduction of CO<sub>2</sub> in Water by a Palladium-Containing Metallopolymer
Marcos F. S. Teixeira,
André Olean-Oliveira,
Fernanda C. Anastácio,
Diego N. David-Parra,
Celso X. Cardoso
Affiliations
Marcos F. S. Teixeira
Department of Chemistry and Biochemistry, School of Science and Technology, Sao Paulo State University (UNESP), Presidente Prudente CEP 19060-900, SP, Brazil
André Olean-Oliveira
Department of Chemistry and Biochemistry, School of Science and Technology, Sao Paulo State University (UNESP), Presidente Prudente CEP 19060-900, SP, Brazil
Fernanda C. Anastácio
Department of Chemistry and Biochemistry, School of Science and Technology, Sao Paulo State University (UNESP), Presidente Prudente CEP 19060-900, SP, Brazil
Diego N. David-Parra
Department of Chemistry and Biochemistry, School of Science and Technology, Sao Paulo State University (UNESP), Presidente Prudente CEP 19060-900, SP, Brazil
Celso X. Cardoso
Department of Physics, School of Science and Technology, Sao Paulo State University (UNESP), Presidente Prudente CEP 19060-900, SP, Brazil
The palladium–salen complex was immobilized by electropolymerization onto a Pt disc electrode and applied as an electrocatalyst for the reduction of CO2 in an aqueous solution. Linear sweep voltammetry measurements and rotating disk experiments were carried out to study the electrochemical reduction of carbon dioxide. The onset overpotential for carbon dioxide reduction was approximately −0.22 V vs. NHE on the poly-Pd(salen) modified electrode. In addition, by combining the electrochemical study with a kinetic study, the rate-determining step of the electrochemical CO2 reduction reaction (CO2RR) was found to be the radial reduction of carbon dioxide to the CO adsorbed on the metal.
