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• Brülle, T
• Ju, W
• Niedermayr, P
• Denisenko, A
• Paschos, O
• Schneider, O
• Stimming, U
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• Brülle, T
• Ju, W
• Niedermayr, P
• Denisenko, A
• Paschos, O
• Schneider, O
• Stimming, U
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• Brülle, T
• Ju, W
• Niedermayr, P
• Denisenko, A
• Paschos, O
• Schneider, O
• Stimming, U

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Molecules 2011, 16(12), 10059-10077; doi:10.3390/molecules161210059

Article

Size-Dependent Electrocatalytic Activity of Gold Nanoparticles on HOPG and Highly Boron-Doped Diamond Surfaces

Tine Brülle ^1,* , Wenbo Ju ¹ , Philipp Niedermayr ¹ , Andrej Denisenko ² , Odysseas Paschos ¹ , Oliver Schneider ¹  and Ulrich Stimming ^1,3,4,5

¹ Department of Physics E19, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany ² Institute of Electron Devices and Circuits, University of Ulm, 89069 Ulm, Germany ³ Institute of Advanced Study (IAS), Technische Universität München, Lichtenbergstr. 2a, 85748 Garching, Germany ⁴ Division 1 of Bavarian Center for Applied Energy Research (ZAE Bayern), Walter-Meißner-Str. 6, 85748 Garching, Germany ⁵ nanoTUM, Technische Universität München, 85748 Garching, Germany

* Author to whom correspondence should be addressed.

Received: 10 October 2011; in revised form: 18 November 2011 / Accepted: 1 December 2011 / Published: 6 December 2011

(This article belongs to the Special Issue Gold Catalysts)

Download PDF Full-Text [1136 KB, uploaded 6 December 2011 10:52 CET]

Abstract: Gold nanoparticles were prepared by electrochemical deposition on highly oriented pyrolytic graphite (HOPG) and boron-doped, epitaxial 100-oriented diamond layers. Using a potentiostatic double pulse technique, the average particle size was varied in the range from 5 nm to 30 nm in the case of HOPG as a support and between < 1 nm and 15 nm on diamond surfaces, while keeping the particle density constant. The distribution of particle sizes was very narrow, with standard deviations of around 20% on HOPG and around 30% on diamond. The electrocatalytic activity towards hydrogen evolution and oxygen reduction of these carbon supported gold nanoparticles in dependence of the particle sizes was investigated using cyclic voltammetry. For oxygen reduction the current density normalized to the gold surface (specific current density) increased for decreasing particle size. In contrast, the specific current density of hydrogen evolution showed no dependence on particle size. For both reactions, no effect of the different carbon supports on electrocatalytic activity was observed.

Keywords: gold nanoparticles; electrocatalytic activity; oxygen reduction reaction; hydrogen evolution reaction; single crystalline diamond

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