Reactions and mass transport in high temperature co-electrolysis of steam/CO2 mixtures for syngas production

Si Won Kim, Hyoungchul Kim, Kyung Joong Yoon, Jong Ho Lee, Byung Kook Kim, Wonjoon Choi, Jong Heun Lee, Jongsup Hong

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

High temperature co-electrolysis of steam/CO2 mixtures using solid oxide cells has been proposed as a promising technology to mitigate climate change and power fluctuation of renewable energy. To make it viable, it is essential to control the complex reacting environment in their fuel electrode. In this study, dominant reaction pathway and species transport taking place in the fuel electrode and their effect on the cell performance are elucidated. Results show that steam is a primary reactant in electrolysis, and CO2 contributes to the electrochemical performance subsequently in addition to the effect of steam. CO2 reduction is predominantly governed by thermochemical reactions, whose influence to the electrochemical performance is evident near limiting currents. Chemical kinetics and mass transport play a significant role in co-electrolysis, given that the reduction reactions and diffusion of steam/CO2 mixtures are slow. The characteristic time scales determined by the kinetics, diffusion and materials dictate the cell performance and product compositions. The fuel electrode design should account for microstructure and catalysts for steam electrolysis and thermochemical CO2 reduction in order to optimize syngas production and store electrical energy effectively and efficiently. Syngas yield and selectivity are discussed, showing that they are substantially influenced by operating conditions, fuel electrode materials and its microstructure.

Original languageEnglish
Pages (from-to)630-639
Number of pages10
JournalJournal of Power Sources
Volume280
DOIs
Publication statusPublished - 2015 Apr 15

Fingerprint

synthesis gas
Steam
electrolysis
Electrolysis
steam
Mass transfer
Electrodes
electrodes
Temperature
cells
microstructure
Microstructure
renewable energy
climate change
electrode materials
electric power
Reaction kinetics
Climate change
Oxides
reaction kinetics

Keywords

  • Co-electrolysis
  • CO reduction
  • CO utilization
  • Solid oxide electrolysis cell
  • Syngas production

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Physical and Theoretical Chemistry

Cite this

Reactions and mass transport in high temperature co-electrolysis of steam/CO2 mixtures for syngas production. / Kim, Si Won; Kim, Hyoungchul; Yoon, Kyung Joong; Lee, Jong Ho; Kim, Byung Kook; Choi, Wonjoon; Lee, Jong Heun; Hong, Jongsup.

In: Journal of Power Sources, Vol. 280, 15.04.2015, p. 630-639.

Research output: Contribution to journalArticle

Kim, Si Won ; Kim, Hyoungchul ; Yoon, Kyung Joong ; Lee, Jong Ho ; Kim, Byung Kook ; Choi, Wonjoon ; Lee, Jong Heun ; Hong, Jongsup. / Reactions and mass transport in high temperature co-electrolysis of steam/CO2 mixtures for syngas production. In: Journal of Power Sources. 2015 ; Vol. 280. pp. 630-639.
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