Stabilization of Electrocatalytic Metal Nanoparticles at Metal鈭扢etal Oxide鈭扜raphene Triple Junction Points

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• 作者：Rong Kou ; Yuyan Shao ; Donghai Mei ; Zimin Nie ; Donghai Wang ; Chongmin Wang ; Vilayanur V Viswanathan ; Sehkyu Park ; Ilhan A. Aksay ; Yuehe Lin ; Yong Wang ; Jun Liu
• 刊名：Journal of the American Chemical Society
• 出版年：2011
• 出版时间：March 2, 2011
• 年：2011
• 卷：133
• 期：8
• 页码：2541-2547
• 全文大小：994K
• 年卷期：v.133,no.8(March 2, 2011)
• ISSN：1520-5126

文摘

Carbon-supported precious metal catalysts are widely used in heterogeneous catalysis and electrocatalysis, and enhancement of catalyst dispersion and stability by controlling the interfacial structure is highly desired. Here we report a new method to deposit metal oxides and metal nanoparticles on graphene and form stable metal鈭抦etal oxide鈭抔raphene triple junctions for electrocatalysis applications. We first synthesize indium tin oxide (ITO) nanocrystals directly on functionalized graphene sheets, forming an ITO鈭抔raphene hybrid. Platinum nanoparticles are then deposited, forming a unique triple-junction structure (Pt鈭扞TO鈭抔raphene). Our experimental work and periodic density functional theory (DFT) calculations show that the supported Pt nanoparticles are more stable at the Pt鈭扞TO鈭抔raphene triple junctions. Furthermore, DFT calculations suggest that the defects and functional groups on graphene also play an important role in stabilizing the catalysts. These new catalyst materials were tested for oxygen reduction for potential applications in polymer electrolyte membrane fuel cells, and they exhibited greatly enhanced stability and activity.