Issue 9, 2013
From the journal:

Energy & Environmental Science

Graphene-supported [{Ru4O4(OH)2(H2O)4}(γ-SiW10O36)2]10− for highly efficient electrocatalytic water oxidation†

Si-Xuan Guo,a   Yuping Liu,a   Chong-Yong Lee,a   Alan M. Bond,*a   Jie Zhang,*a   Yurii V. Geletiib  and  Craig L. Hill*b  

* Corresponding authors

a School of Chemistry, Monash University, Clayton, Vic 3800, Australia
E-mail: alan.bond@monash.edu, jie.zhang@monash.edu

b Department of Chemistry, Emory University, 1525 Dickey Dr., Atlanta, GA 30322, USA
E-mail: chill@emory.edu

Abstract

The electrochemistry of the Ru-containing polyoxometalate (POM) water oxidation molecular catalyst, Rb8K2[{Ru4O4(OH)2(H2O)4}(γ-SiW10O36)2]10− (Rb8K2-1), has been studied by cyclic and rotating disk electrode voltammetric methods in aqueous media under acidic and neutral pH conditions using bare glassy carbon (GC) and graphene modified GC electrodes. High concentrations of supporting electrolyte are needed in neutral pH conditions to overcome the electrical double layer effect associated with the highly negatively charged 1. Complex 1 can be confined within the highly porous wet graphene film to form a stable modified electrode, which shows excellent catalytic activity and high stability toward the water oxidation reaction under neutral pH conditions, particularly in the presence of 1.0 M Ca(NO3)2. The catalytic activity of the graphene supported 1electrode is nearly two orders of magnitude higher than that reported with a polymer coated multiwalled carbon nanotube supported 1electrode when both are employed at a moderate overpotential of 0.35 V.

Graphical abstract: Graphene-supported [{Ru4O4(OH)2(H2O)4}(γ-SiW10O36)2]10− for highly efficient electrocatalytic water oxidation

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Article information

DOI
https://doi.org/10.1039/C3EE41892H
Article type
Paper
Submitted
04 Jun 2013
Accepted
11 Jun 2013
First published
12 Jun 2013

Energy Environ. Sci., 2013,6, 2654-2663

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Graphene-supported [{Ru4O4(OH)2(H2O)4}(γ-SiW10O36)2]10− for highly efficient electrocatalytic water oxidation

S. Guo, Y. Liu, C. Lee, A. M. Bond, J. Zhang, Y. V. Geletii and C. L. Hill, Energy Environ. Sci., 2013, 6, 2654 DOI: 10.1039/C3EE41892H

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