New strategy to prepare enriched and small gold nanoparticles by sonoelectrochemical pulse methods

Keng Liang Ou, Kuang Hsuan Yang, Yu Chuan Liu, Ting Chu Hsu, Qing Ye Chen

研究成果: 雜誌貢獻文章同行評審

3 引文 斯高帕斯(Scopus)

摘要

In this work, we report a new sonoelectrochemical pathway to prepare enriched and small Au nanoparticles (NPs) in aqueous solutions via aid of chitosan (Ch). First, Au substrate was cycled in a deoxygenated aqueous solution containing 0.1 M NaCl and 1 g/L Ch from -0.28 to +1.22 V vs Ag/AgCl at 500 mV/s for 500 scans. The durations at the cathodic and anodic vertices are 10 and 5 s, respectively. Subsequently, a cathodic overpotential of 0.6 V and an anodic overpotential of 0.2 V from open circuit potential (OCP) were applied in turn under sonication to prepare enriched and small Au NPs. The ratio of reaction time during cathodic overpotential to that during anodic overpotential was investigated to be 0.5 for obtaining enriched and smaller Au NPs of 5 nm in diameter in solution. The catalytic activity of the prepared Au NPs was examined by analyzing the decomposition of acetaldehyde in solution. Experimental results indicate that the decomposition of acetaldehyde based on the prepared Au NPs is significantly increased by ca. 240% of magnitude, as compared with that based on previously prepared Au NPs of 10 nm at the same Au concentration.

原文英語
頁(從 - 到)497-502
頁數6
期刊Electrochimica Acta
58
發行號1
DOIs
出版狀態已發佈 - 十二月 30 2011

ASJC Scopus subject areas

  • 電化學
  • 化學工程 (全部)

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