Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/101290
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Type: Journal article
Title: Determination of the electron transfer number for the oxygen reduction reaction: from theory to experiment
Author: Zhou, R.
Zheng, Y.
Jaroniec, M.
Qiao, S.
Citation: ACS Catalysis, 2016; 6(7):4720-4728
Publisher: American Chemical Society
Issue Date: 2016
ISSN: 2155-5435
2155-5435
Statement of
Responsibility: 
Ruifeng Zhou, Yao Zheng, Mietek Jaroniec, and Shi-Zhang Qiao
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.
Keywords: Oxygen reduction reaction; electron transfer number; hydrogen peroxide production; rotating ring-disk electrode; Koutecky-Levich equation
Rights: © 2016 American Chemical Society
DOI: 10.1021/acscatal.6b01581
Grant ID: http://purl.org/au-research/grants/arc/DP130104459
http://purl.org/au-research/grants/arc/DP140104062
http://purl.org/au-research/grants/arc/DP160104866
Appears in Collections:Aurora harvest 3
Chemical Engineering publications

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