Cathodic reaction kinetics for CO2 capture and utilization in molten carbonates at mild temperatures

Muxing Gao, Bowen Deng, Zhigang Chen, Meng Tao, Dihua Wang

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Electrochemical reduction of CO2 to value-added carbon and oxygen in molten carbonates is a promising approach to the efficient and economical utilization of CO2. Fully understanding the electrode kinetics is crucial to scaling up the process. Herein, the reduction kinetics were studied by cyclic voltammetry, linear sweep voltammetry and potentiostatic electrolysis. The electrolytic products prepared at selected potentials were characterized by X-ray diffraction. It was found that the cathode surface was partially covered by insoluble lithium oxide and that the sluggish diffusion of the O2– ion was the rate-determining step during carbon deposition at 723 K. When the temperature is increased to 923 K, the reaction kinetics are accelerated around 100-fold with a limiting current density of 1.5 A/cm2. Knowledge of this mechanism should prove useful in the design of a pilot cell based on molten salt CO2 capture and electrochemical transformation (MSCC-ET) technology.

Original languageEnglish (US)
Pages (from-to)79-82
Number of pages4
JournalElectrochemistry Communications
Volume88
DOIs
StatePublished - Mar 1 2018

Keywords

  • Carbon dioxide utilization
  • Electrochemical reduction
  • Electrode kinetics
  • Molten carbonates
  • Rate-determining step

ASJC Scopus subject areas

  • Electrochemistry

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