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Oxygen Electroreduction Performance of Ultrasmall Gold Nanoclusters
潘国强
作者单位E-mail
潘国强 中国科技大学国家同步辐射实验室 gqpan@ustc.edu.cn 
摘要:
Ultrasmall gold nanoclusters consisting of 2?4 Au atoms were synthesized and their performance in electrocatalytic oxygen reduction reactions (ORR) was examined. These clusters were synthesized by exposing AuPPh3Cl to the aqueous ammonia medium for one week. Electrospray ionization mass spectrometry (ESI-MS), X-ray absorption fine structure (XAFS), and X-ray photoelectron spectroscopy (XPS) analyses indicate that the as-synthesized gold clusters (abbreviated as Aux) consist of 2?4 Au atoms coordinated by the triphenylphosphine, hydroxyl, and adsorbed oxygen ligands. A glassy carbon disk electrode loaded with the Aux clusters (Aux/GC) was characterized by the cyclic and rotating-disk voltammetry for ORR. The cyclic voltammogram shows the onset potential of -0.1 V, and the kinetic parameters of JK at -0.5 V and the electron-transfer number per oxygen molecule were calculated to be 14.28 mA cm-2 and 3.96 via the Koutecky-Levich equations, respectively.
关键词:  Ultrasmall gold nanoclusters, Synthesis, Oxygen reduction reactions, Eectrocatalyst
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Oxygen Electroreduction Performance of Ultrasmall Gold Nanoclusters
潘国强
Abstract:
Ultrasmall gold nanoclusters consisting of 2?4 Au atoms were synthesized and their performance in electrocatalytic oxygen reduction reactions (ORR) was examined. These clusters were synthesized by exposing AuPPh3Cl to the aqueous ammonia medium for one week. Electrospray ionization mass spectrometry (ESI-MS), X-ray absorption fine structure (XAFS), and X-ray photoelectron spectroscopy (XPS) analyses indicate that the as-synthesized gold clusters (abbreviated as Aux) consist of 2?4 Au atoms coordinated by the triphenylphosphine, hydroxyl, and adsorbed oxygen ligands. A glassy carbon disk electrode loaded with the Aux clusters (Aux/GC) was characterized by the cyclic and rotating-disk voltammetry for ORR. The cyclic voltammogram shows the onset potential of -0.1 V, and the kinetic parameters of JK at -0.5 V and the electron-transfer number per oxygen molecule were calculated to be 14.28 mA cm-2 and 3.96 via the Koutecky-Levich equations, respectively.
Key words:  Ultrasmall gold nanoclusters, Synthesis, Oxygen reduction reactions, Eectrocatalyst