New Challenges of Electrokinetic Study in Investigating the Reaction Mechanism of Electrochemical CO2 Reduction

Title
New Challenges of Electrokinetic Study in Investigating the Reaction Mechanism of Electrochemical CO2 Reduction
Authors
민병권황윤정이찬우지신천조남현임상원남기태
Keywords
CO2 reduction; Electrocatalyst
Issue Date
2018-08
Publisher
Journal of materials chemistry. A, Materials for energy and sustainability
Citation
VOL 6, NO 29-14057
Abstract
An electrokinetic analysis of electrochemical CO2 reduction reactions provides information about the decoupled involvement of electron– proton transfer from the Tafel slope and reaction order analyses. Conventionally, a one-electron transfer to CO2 and a chemical proton transfer from HCO3  have been considered to be typical rate-limiting steps. These suggested reaction mechanisms are justified under several assumptions: (1) the bicarbonate ion is a major proton donor, (2) the gaseous CO2 is a carbon source, (3) the reaction mechanism is unaffected by the applied potentials outside the Tafel region, etc. However, recent electrokinetic studies combined with in situ and isotopic experiments raise a question that the above conventional assumptions may not always be valid. Furthermore, there are unresolved issues between the mechanisms suggested by electrokinetic studies. In this review, reported reaction mechanisms of the CO2 reduction reaction are summarized with CO and HCOO formation as model reaction systems. The reaction pathways are also discussed with a theoretical consideration. A deep investigation into the mechanisms reveals the complex feature of reaction pathways and the difficulty in suggesting the mechanism solely from an electrokinetic analysis.
URI
http://pubs.kist.re.kr/handle/201004/68032
ISSN
2050-7488
Appears in Collections:
KIST Publication > Article
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