| AVS 55th International Symposium & Exhibition | |
| Plasma Science and Technology | Thursday Sessions |
| Session PS-ThP |
| Session: | Plasma Science Poster Session |
| Presenter: | Y. Ichino, Nagoya University, Japan |
| Authors: | Y. Ichino, Nagoya University, Japan K. Mitamura, Nagoya University, Japan N. Saito, Nagoya University, Japan O. Takai, Nagoya University, Japan |
| Correspondent: | Click to Email |
Nonequilibrium plasma in aqueous solution, which is solution plasma (SP), is expected as a frontier of plasma nanomaterials processing. The SP processing can realize rapid synthesis at low temperature compared to the conventional methods such as chemical synthesis in solution and plasma processing in gas. We had successfully synthesized Au, Pt and FePt nanoparticles by SP processing. On the other hand, carbon nanoball (CNB) is one of carbon nanomaterial such as carbon nanotube (CNT) and fullerene. The CNB is expected as an electrode material for fuel cells. We already have been successful to synthesis well-defined CNBs. In order to improve the energy-conversion efficiency in fuel cells, Pt nanoparticles must be mounted on CNBs in the high density. In this study, we aim to prepare Pt nanoparticles in the high density supported on CNB (Pt/CNB) by using SP processing and to characterize the properties as the electrode for fuel cells. Carbon nanoball was prepared by thermal CVD process. Ethylene was used as a raw material. Argon and hydrogen ware used as carrier gases. Solution plasma was generated by a pulsed power supply. Tungsten wire coated with alumina was used as the electrodes. 1.44 mM H2PtCl6 solution was added to 50 mg CNB, and polyvinylpyrrolidone (PVP) or sodium dodecyl sulfate (SDS) as a protective agent. After the discharge, the obtained Pt/CNBs were characterized by a scanning transmission electron microscope (STEM), energy dispersive X-ray spectroscopy (EDS) inductively-coupled plasma optical emission spectrometry (ICP-OES). The catalytic properties of Pt/CNB was evaluated by cyclic voltammetry (CV). Color of the solution changed from yellow to dark brown as synthesis time. This change indicates the decrease of H2PtCl6 complex in the solution and the improvement of dispersibility of CNB. Moreover, STEM images and elemental mapping images show the Pt nanoparticles supported on CNB. A catalytic activity of the obtained Pt/CNB was shown to be higher than the Pt/CNB prepared by conventional method since the adsorption wave of hydrogen was observed from CV. The activity was varied by the amount of supported Pt nanoparticles, which depended on SP processing conditions.