TY  - JOUR
AU  - Monteiro, Mariana C. O.
AU  - Jacobse, Leon
AU  - Koper, Marc
TI  - Understanding the Voltammetry of Bulk CO Electrooxidation in Neutral Media through Combined SECM Measurements
JO  - The journal of physical chemistry letters
VL  - 11
SN  - 1948-7185
CY  - Washington, DC
PB  - ACS
M1  - PUBDB-2020-04512
SP  - 9708 - 9713
PY  - 2020
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - pmid:33136404
UR  - <Go to ISI:>//WOS:000592959100026
DO  - DOI:10.1021/acs.jpclett.0c02779
UR  - https://bib-pubdb1.desy.de/record/452120
ER  -