Controlled Synthesis of CeO2/Graphene Nanocomposites with Highly Enhanced Optical and Catalytic Properties

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• 作者：Linhai Jiang ; Mingguang Yao ; Bo Liu ; Quanjun Li ; Ran Liu ; Hang Lv ; Shuangchen Lu ; Chen Gong ; Bo Zou ; Tian Cui ; Bingbing Liu ; Guangzhi Hu ; Thomas W氓gberg
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：May 31, 2012
• 年：2012
• 卷：116
• 期：21
• 页码：11741-11745
• 全文大小：304K
• 年卷期：v.116,no.21(May 31, 2012)
• ISSN：1932-7455

文摘

In this paper, CeO₂ nanocubes with the (200)-terminated surface/graphene sheet composites have been prepared successfully by a simple hydrothermal method. It is found that the CeO₂ nanocubes with high crystallinity and specific exposed surface are well dispersed on well-exfoliated graphene surface. The (200)-terminated surface/graphene sheet composites modified electrode showed much higher sensitivity and excellent selectivity in its catalytic performance compared to a CeO₂ nanoparticle-modified electrode. The photoluminescence intensity of the CeO₂ anchored on graphene is about 30 times higher than that of pristine CeO₂ crystals in air. The higher oxygen vacancy concentration in CeO₂ is supposed to be an important cause for the higher photoluminescence and better electrochemical catalytic performance observed in the (200)-terminated surface/graphene sheet composites. Such ingenious design of supported well-dispersed catalysts in nanostructured ceria catalysts, synthesized in one step with an exposed high-activity surface, is important for technical applications and theoretical investigations.