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

Molecules

Tine Brülle¹  Wenbo Ju¹  Philipp Niedermayr¹  Andrej Denisenko¹  Odysseas Paschos¹  Oliver Schneider¹ 

[1]¹Department of Physics E19, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany

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

DOI  :  10.3390/molecules161210059

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.