首页|Fundamentals on kinetics of electrochemical reduction of CO2 at a bismuth electrode
Fundamentals on kinetics of electrochemical reduction of CO2 at a bismuth electrode
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NSTL
Elsevier
Electrochemical reduction of CO2 into renewable carbon-neutral fuels has been extensively studied. Current attentions mainly focus on the development of high-performance materials and molecular dynamics, fundamentals on kinetics of electrochemical reduction of CO2 are still unclear. Herein, we design a simplified electrochemical process, CO2-saturated K2SO4 solution at bismuth electrodes, to elucidate the electrochemical reaction kinetics of CO2 reduction reaction. A totally irreversible process for CO2 reduction reaction occurs and this reaction can be described as CO2 + H2O + 2e- -> HCOO- + OH-. It is firstly reported that the reduction of CO2 at bismuth electrodes is of a diffusion-controlled process, and the diffusion coefficient of CO2 is (1.98 +/- 0.22) x 10-5 cm2 center dot s-1. From the well-defined linear sweep voltammograms, electron transfer coefficient is obtained as 0.18 +/- 0.01. Combining with the half-wave potential (-1.503 +/- 0.002 V vs. Ag/ AgCl (sat. KCl)) from differential pulse voltametric results, the standard heterogeneous rate constant is estimated to be (3.4 +/- 0.2) x 10-3 cm center dot s-1. These new findings may identify electrochemical reaction kinetic questions and be helpful to understanding the electrochemical conversion between CO2 and carbon-neutral renewable energy.
CO 2 electrochemical reductionBismuth electrodeKineticsDiffusion coefficientElectron transfer coefficientStandard heterogeneous rate constantCARBON-DIOXIDEBICARBONATEMECHANISM
NSTL
Elsevier
