Journal
MOLECULES
Volume 16, Issue 12, Pages 10059-10077Publisher
MDPI AG
DOI: 10.3390/molecules161210059
Keywords
gold nanoparticles; electrocatalytic activity; oxygen reduction reaction; hydrogen evolution reaction; single crystalline diamond
Funding
- Deutscher Akademischer Austauschdienst (DAAD) [50784701]
- International Graduate School of Science and Engineering (IGSSE) [2-6]
- Deutsche Forschungsgemeinschaft [1376]
- Max Buchner Forschungsstiftung (DECHEMA)
- Vodafone Presidential Science and Engineering Fellowship
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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.
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