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O: Fachverband Oberflächenphysik

O 72: Oxide and Insulator Surfaces: Adsorption I

O 72.8: Vortrag

Mittwoch, 22. März 2017, 12:15–12:30, WIL C107

Enhanced photocatalytic activities of net-like hematite nanoparticle/graphene oxide composite and mechanism study — •Huanming Zhang¹, Min Zhou¹, Yang Xu¹, Fanna Meng², Lihong Qi², Yujin Chen², and Yong Lei¹ — ¹Institute für Physics & IMN MacroNano (ZIK), Technische Universität Ilmenau, Prof-Schemidt-Strasse 26, 98693 Ilmenau, Germany — ²Key Laboratory of In-Fiber Integrated Optics, Ministry of Education, College of Science, Harbin Engineering University, 150001 Harbin, China

In photocatalytic water oxidation, hematite possesses many attractive features, for instance favorable optical band gap (approximately 2.1 eV), chemical stability, natural abundance, nontoxicity and low cost. However, its surface reaction kinetics is sluggish. Herein, a facile strategy was developed to fabricate net-like hematite nanoparticle/graphene oxide (GO) composite (NHG), in which the degree of oxidization of GO could be controlled by simply changing annealing time, and GO replaces part of α-Fe2O3 as the reaction interface to speed up the oxygen evolution rate. NHG with GO of appropriate oxidization degree and content exhibited much higher photocatalytic activities than α-Fe2O3 nanorods and commercial α-Fe2O3. The strategy presented here could be expanded as a general method to synthesize other types of photocatalysts modified with GO for applications in photocatalysis.