Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 78: Poster: Surface Dynamics - Reactions, Elementary Processes and Phase Transitions

O 78.2: Poster

Mittwoch, 14. März 2018, 18:15–20:30, Poster A

enhanced photocatalytic activities of net-like hematite nanoparticle modified with graphene oxide and mechanism insight — •huanming zhang¹, min zhou¹, yang xu¹, shipu xu¹, fanna meng², lihong qi², yujin chen², and yong lei¹ — ¹Institute für Physics & IMN MacroNano (ZIK), Technische Universität Ilmenau, 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 sluggish surface reaction kinetics, short carrier lifetime and considerably shorter diffusion length of holes compared with the absorption depth hold back its practical application. Thus, A co-catalyst may be an effective way to remedy these drawbacks. Herein, a facile strategy was developed to fabricate net-like hematite nanoparticle (NHN) modified with graphene oxide (GO), in which the degree of oxidization of GO could be controlled by simply changing annealing time, and GO replaces part of hematite 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 hematite nanorods and commercial hematite. The strategy presented here could be expanded as a general method to synthesize other types of photocatalysts modified with GO for applications in photocatalysis.