Journal Article

PUBDB-2020-04512

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Understanding the Voltammetry of Bulk CO Electrooxidation in Neutral Media through Combined SECM Measurements

Monteiro, M. C. O.Extern* ; Jacobse, L.DESY* ; Koper, M. (Corresponding author)Extern*

2020
ACS Washington, DC

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Please use a persistent id in citations: doi:10.1021/acs.jpclett.0c02779  doi:10.3204/PUBDB-2020-04512

Abstract: Recently, the bulk electrooxidation of CO on gold or platinum has been usedto detect CO produced during CO2reduction in neutral media. The CO bulk oxidationvoltammetry may show two distinct peaks depending on the reaction conditions, which up tonow have not been understood. We have used scanning electrochemical microscopy (SECM)to probe CO oxidation and pH in the diffusion layer during CO2reduction. Our results showthat the two different peaks are due to diffusion limitation by two different species, namely,CO and OH−.Wefind that between pH 7 and 11, CO oxidation by water and OH−gives riseto thefirst and second peak observed in the voltammetry, respectively. Additional rotating discexperiments showed that specifically in this pH range the current of the second peak isdiffusion limited by the OH−concentration, since it is lower than the CO concentration.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Nanolab (FS-NL)

Research Program(s):

1. 6213 - Materials and Processes for Energy and Transport Technologies (POF3-621) (POF3-621)

Experiment(s):

1. DESY NanoLab: Sample Preparation
2. DESY NanoLab: Electrochemistry Lab

Appears in the scientific report 2020

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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