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

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Oyunbileg G ; Batnyagt G ; Enkhsaruul B ; T Takeguchi (2018)
  • Publisher: Mongolian Academy of Sciences
  • Journal: Mongolian Journal of Chemistry (issn: 2226-6739, eissn: 2414-0082)
  • Related identifiers: doi: 10.5564/mjc.v18i44.935
  • Subject: fuel cell | oxygen reduction reaction | gold nanostars | Chemistry | QD1-999

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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