| AVS 62nd International Symposium & Exhibition | |
| Thin Film | Wednesday Sessions |
| Session TF+EN-WeM |
| Session: | ALD for Energy |
| Presenter: | Kun Cao, Huazhong University of Science and Technology, Wuhan, China |
| Authors: | K. Cao, Huazhong University of Science and Technology, Wuhan, China J.M. Cai, Huazhong University of Science and Technology, Wuhan, China B. Shan, Huazhong University of Science and Technology, Wuhan, China R. Chen, Huazhong University of Science and Technology, Wuhan, China |
| Correspondent: | Click to Email |
Platinum nanoparticles (NPs) play an important role in the catalytic applications such as conversion of automotive exhaust, fuel cells, nano sensing and so on. For most catalytic applications, sintering of Pt NPs is undesired since the coalescence decreases the number of active sites of the catalyst. Herein we report the utilization of active oxide layers to encapsulate Pt NPs for CO oxidation. The active oxide coated catalysts have additional metal-oxide interfaces which may further improve the catalytic activity besides good sintering resistance. We use cobalt oxide, cerium oxide and nickel oxide as the active oxide encapsulations. Compared with aluminum oxide reference samples, these active oxides have been reported as much better materials with synergetic effect for Pt catalysts. The thickness of the metal oxide film is controlled by varying the number of ALD cycles. CO oxidation measurements were carried out in a micro flow reactor designed for planar model catalysts. Our results indicate that cobalt oxide coated Pt nanoparticles demonstrating the highest activity towards CO oxidation, and the optimal coating thickness is around 1nm. At the same time the coated catalysts have good thermal stability up to 750°C under atmospheric conditions. The enhancement of catalytic activity may originate from the active oxygen at the Pt/cobalt oxide interface, further Co (II) sites show better synergetic effect compared with Co (III) sites.