The importance of identifying the true catalyst when using Randles-Sevcik equation to calculate turnover frequency
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Date
2021-11-03
Publication Type
Journal Article
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yes
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Abstract
Water splitting will become important to store excess renewable electrical energy into hydrogen. Although the oxygen-evolution reaction (OER) by water oxidation is a critical reaction for water splitting, further investigations are needed to find the details of the OER mechanism for various electrocatalysts. More in particular for homogeneous electrocatalysts, the Randles-Sevcik equation has been extensively applied to determine the turnover frequency (TOF). Herein, using vitamin B12 as a case study, we show that the dynamical deposition/dissolution of the heterogeneous catalyst during OER makes the Randles-Sevcik equation too complicated to be used for calculating the TOF. Indeed, the conventionally applied post-characterization methods do not provide sufficient accuracy to prove the homogeneity of OER mechanisms; thus, using the Randles-Sevcik equation to calculate the TOF is not necessarily correct.
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published
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Journal / series
Volume
46 (76)
Pages / Article No.
37774 - 37781
Publisher
Elsevier
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Subject
Metal complex; Precatalyst; Randles-Sevcik equation; True catalyst; water oxidation
Organisational unit
02891 - ScopeM / ScopeM