Synthesis and electrocatalytic activity towards oxygen reduction reaction of gold-nanostars

  • Oyunbileg G School of Arts and Sciences, National University of Mongolia, Ulaanbaatar 210646, Mongolia
  • Batnyagt G Iwate University, 4-3-5 Ueda, Morioka, Iwate 020-8551, Japan
  • Enkhsaruul B School of Arts and Sciences, National University of Mongolia, Ulaanbaatar 210646, Mongolia
  • T Takeguchi Iwate University, 4-3-5 Ueda, Morioka, Iwate 020-8551, Japan
Keywords: fuel cell, oxygen reduction reaction, gold nanostars,

Abstract

The oxygen reduction reaction (ORR) is a characteristic reaction which determines the performance of fuel cells which convert a chemical energy into an electrical energy. Aims of this study are to synthesize Au-based nanostars (AuNSs) and determine their preliminary electro-catalytic activities towards ORR by a rotating-disk electrode method in alkaline electrolyte. The images obtained from a scanning electron microscope (SEM) and a transmission electron microscope (TEM) analyses confirm the formation of the star-shaped nanoparticles. Among the investigated nanostar catalysts, an AuNS5 with smaller size and a few branches showed the higher electrocatalytic activity towards ORR than other catalysts with a bigger size. In addition, the electron numbers transferred for all the catalysts are approximately two. The present study results infer that the size of the Au-based nanostars may influence greatly on their catalytic activity. The present study results show that the further improvement is needed for Au-based nanostar catalysts towards the ORR reaction.

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Abstract
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PDF
140
Published
2018-02-13
How to Cite
G, O., G, B., B, E., & Takeguchi, T. (2018). Synthesis and electrocatalytic activity towards oxygen reduction reaction of gold-nanostars. Mongolian Journal of Chemistry, 18(44), 36-40. https://doi.org/10.5564/mjc.v18i44.935
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Articles