Determination of the electron transfer number for the oxygen reduction reaction: from theory to experiment

Zhou, Ruifeng, Zheng, Yao, Jaroniec, Mietek and Qiao, Shi-Zhang (2016) Determination of the electron transfer number for the oxygen reduction reaction: from theory to experiment. ACS Catalysis, 6 7: 4720-4728. doi:10.1021/acscatal.6b01581


Author Zhou, Ruifeng
Zheng, Yao
Jaroniec, Mietek
Qiao, Shi-Zhang
Title Determination of the electron transfer number for the oxygen reduction reaction: from theory to experiment
Journal name ACS Catalysis   Check publisher's open access policy
ISSN 2155-5435
Publication date 2016-06-09
Year available 2016
Sub-type Article (original research)
DOI 10.1021/acscatal.6b01581
Open Access Status Not yet assessed
Volume 6
Issue 7
Start page 4720
End page 4728
Total pages 9
Place of publication Washington, DC, United States
Publisher American Chemical Society
Collection year 2017
Language eng
Formatted abstract
The forced convection methods on the rotating disk and ring-disk electrodes are carefully analyzed toward their use for calculation of the electron transfer number (n) for the oxygen reduction reaction (ORR) on various catalysts. It is shown that the widely used Koutechy-Levich (KL) method is not suitable to determine n for the ORR either theoretically or experimentally. From a theoretical viewpoint, the ORR is neither a single-step nor a one-way reaction and, therefore does not fulfill the assumptions of the KL method. From an experimental viewpoint, n is significantly dependent on the angular velocity of the rotating disk electrode, contradicting the assumption of constant n in the KL theory. An improved model is used to establish the aforementioned relationship between n and angular velocity. The recommended way to determine n for the ORR in alkaline electrolytes is to use the rotating ring-disk electrode with a properly biased Au ring, supplemented by the calibration of the collection efficiency.
Keyword Electron transfer number
Hydrogen peroxide production
Koutecky-Levich equation
Oxygen reduction reaction
Rotating ring-disk electrode
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
Australian Institute for Bioengineering and Nanotechnology Publications
 
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