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Open AccessFeature PaperArticle

Tafel Slope Analyses for Homogeneous Catalytic Reactions

Department of Chemistry, Emory University, Atlanta, GA 30322, USA
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Author to whom correspondence should be addressed.
Catalysts 2021, 11(1), 87; https://doi.org/10.3390/catal11010087
Received: 25 December 2020 / Revised: 7 January 2021 / Accepted: 8 January 2021 / Published: 11 January 2021
(This article belongs to the Special Issue Electrocatalytic Water Oxidation)
Tafel analysis of electrocatalysts is essential in their characterization. This paper analyzes the application of Tafel-like analysis to the four-electron nonelectrochemical oxidation of water by the stoichiometric homogeneous 1-electron oxidant [Ru(bpy)3]3+ to dioxygen catalyzed by homogeneous catalysts, [Ru4O4(OH)2(H2O)4(γ-SiW10O36)2]10− (Ru4POM) and [Co4(H2O)2(PW9O34)2]10– (Co4POM). These complexes have slow electron exchange rates with electrodes due to the Frumkin effect, which precludes the use of known electrochemical methods to obtain Tafel plots at ionic strengths lower than 0.5 M. The application of an electron transfer catalyst, [Ru(bpy)3]3+/2+, increases the rates between the Ru4POM and electrode, but a traditional Tafel analysis of such a complex system is precluded due to a lack of appropriate theoretical models for 4-electron processes. Here, we develop a theoretical framework and experimental procedures for a Tafel-like analysis of Ru4POM and Co4POM, using a stoichiometric molecular oxidant [Ru(bpy)3]3+. The dependence of turnover frequency (TOF) as a function of electrochemical solution potential created by the [Ru(bpy)3]3+/[Ru(bpy)3]2+ redox couple (an analog of the Tafel plot) was obtained from kinetics data and interpreted based on the suggested reaction mechanism. View Full-Text
Keywords: Tafel; polyoxometalate; water oxidation; stopped-flow; kinetics; catalyst comparison Tafel; polyoxometalate; water oxidation; stopped-flow; kinetics; catalyst comparison
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MDPI and ACS Style

Yin, Q.; Xu, Z.; Lian, T.; Musaev, D.G.; Hill, C.L.; Geletii, Y.V. Tafel Slope Analyses for Homogeneous Catalytic Reactions. Catalysts 2021, 11, 87. https://doi.org/10.3390/catal11010087

AMA Style

Yin Q, Xu Z, Lian T, Musaev DG, Hill CL, Geletii YV. Tafel Slope Analyses for Homogeneous Catalytic Reactions. Catalysts. 2021; 11(1):87. https://doi.org/10.3390/catal11010087

Chicago/Turabian Style

Yin, Qiushi; Xu, Zihao; Lian, Tianquan; Musaev, Djamaladdin G.; Hill, Craig L.; Geletii, Yurii V. 2021. "Tafel Slope Analyses for Homogeneous Catalytic Reactions" Catalysts 11, no. 1: 87. https://doi.org/10.3390/catal11010087

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