Carbon black supported ultra-high loading silver nanoparticle catalyst and its enhanced electrocatalytic activity towards oxygen reduction reaction in alkaline medium

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• 作者：Xinhua Xu¹ ; Chang Tan¹ ; Haijing Liu ; Feng Wang ; ^{wangf@mail.buct.edu.cn} ; Zhilin Li ; Jingjun Liu ; Jing Ji
• 关键词：Carbon black ; Silver nanoparticle ; Ultra-high loading ; Catalyst ; Oxygen reduction reaction
• 刊名：Journal of Electroanalytical Chemistry
• 出版年：2013
• 出版时间：1 May, 2013
• 年：2013
• 卷：696
• 期：Complete
• 页码：9-14
• 全文大小：1250 K

文摘

Carbon black supported ultra-high loading silver nanoparticle catalyst (Ag/C) was prepared by a modified ethylene glycol reduction method. The thermogravimetry analysis showed that the Ag mass loading of this catalyst reached up to 392 wt. % . The X-ray diffraction and scanning electron microscopy characterizations showed that the Ag nanoparticles were ca. 10 nm diameter of fine spheres with a face-centered cubic crystal structure, and were densely stacked but not aggregated on the carbon black surface in spite of such ultra-high loading and small size. The chronoamperometry and polarization studies utilizing rotating disk electrode (RDE) or rotating ring disk electrode (RRDE) revealed that this ultra-high loading 392 wt. % Ag/C catalyst exhibited higher electrocatalytic activity for oxygen reduction reaction (ORR) in alkaline medium. The ORR proceeded a four-electron process when compared with the low loading 40 wt. % Ag/C catalyst. Furthermore, the chronopotentiometry test on gas-diffusion electrode containing the 392 wt. % Ag/C catalyst implied that this catalyst had a considerably stable ORR activity for application in brine electrolysis.