Hierarchical CuO Colloidosomes and Their Structure Enhanced Photothermal Catalytic Activity

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• 作者：Jie Xu ; Xiaoman Li ; Xuan Wu ; Wenzhong Wang ; Rong Fan ; Xiaokong Liu ; Haolan Xu
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：June 16, 2016
• 年：2016
• 卷：120
• 期：23
• 页码：12666-12672
• 全文大小：494K
• 年卷期：0
• ISSN：1932-7455

文摘

Hierarchical CuO colloidosomes (hollow spheres) constructed by subunit of open-mouthed hollow spheres that consist of 2D nanoleaves are synthesized via a Pickering emulsion strategy. Cu₂O particles were served as emulsifier particles to form the Pickering emulsions. Self-oxidation of Cu₂O gave rise to the formation of CuO nanoleaves which spontaneously cross-link the neighboring particles on the emulsion droplet surfaces, forming the robust colloidosomes. Concurrently, asymmetric Kirkendall effect produced the open-mouthed hollow structure in the subunit CuO particles, resulting in the hierarchical hollow structures of the colloidosomes. Because of the complex and multilevel hollow structure, the CuO colloidosomes significantly enhanced light harvest and photothermal conversion, leading to high local temperature (∼200 °C) on the surfaces under light irradiation at room temperature. This structure enhanced photothermal effect realized the photothermal catalytic CO oxidation at room temperature with a reaction rate 20 times higher than that of thermal catalysis at 240 °C.