Metal/Oxide Interface Nanostructures Generated by Surface Segregation for Electrocatalysis

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• 作者：Zhe Weng ; Wen Liu ; Li-Chang Yin ; Ruopian Fang ; Min Li ; Eric I. Altman ; Qi Fan ; Feng Li ; Hui-Ming Cheng ; Hailiang Wang
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：November 11, 2015
• 年：2015
• 卷：15
• 期：11
• 页码：7704-7710
• 全文大小：468K
• ISSN：1530-6992

文摘

Strong metal/oxide interactions have been acknowledged to play prominent roles in chemical catalysis in the gas phase, but remain as an unexplored area in electrocatalysis in the liquid phase. Utilization of metal/oxide interface structures could generate high performance electrocatalysts for clean energy storage and conversion. However, building highly dispersed nanoscale metal/oxide interfaces on conductive scaffolds remains a significant challenge. Here, we report a novel strategy to create metal/oxide interface nanostructures by growing mixed metal oxide nanoparticles on carbon nanotubes (CNTs) and then selectively promoting migration of one of the metal ions to the surface of the oxide nanoparticles and simultaneous reduction to metal. Employing this strategy, we have synthesized Ni/CeO₂ nanointerfaces coupled with CNTs. The Ni/CeO₂ interface promotes hydrogen evolution catalysis by facilitating water dissociation and modifying the hydrogen binding energy. The Ni/CeO₂鈥揅NT hybrid material exhibits superior activity for hydrogen evolution as a result of synergistic effects including strong metal/oxide interactions, inorganic/carbon coupling, and particle size control.