Research & Reviews: Journal of Material Sciences
MenuISSN:2321-6212
ISSN:2321-6212
Heeyeon Kim
Korea Institute of Energy Research, South Korea
Posters & Accepted Abstracts: Res. Rev. J Mat. Sci
We have developed facile CVD techniques for the synthesis of metal hybrid nano-catalysts used for fuel cell or secondary battery. By using CVD technique, we can easily obtain the perfect catalytic structure and manipulate the microstructure of the nano metal catalysts. It is noteworthy that the conventional multi-step synthetic processes can be simplified into a single-step process or a sequential process by these processes. For the single-step CVD synthesis of Pt nano catalyst decorated with porous graphene shells, MeCpPtMe3 was used as a precursor of Pt nano particles. For the synthesis of graphene shells, various hydrocarbon precursors such as acetylene, acetone or ethyl alcohol were used as precursors, which were vaporized and simultaneously flowed into the CVD reactor. For the low-temperature synthesis of bimetallic nano alloys for fuel cell electrode, we applied one-pot sequential CVD technique. For the synthesis of Pt-Co bimetallic nanoparticles, MeCpPtMe3 was vaporized and flowed into a CVD reactor, where carbon black was placed as a support of Pt-Co bimetallic catalyst. For Co deposition, CpCo(CO)2 was vaporized and flowed into the CVD chamber. Then, the Pt with Co nano particles deposited on carbon black was annealed for the synthesis of Pt3Co bimetallic nanoparticles. By single step CVD technique, Pt with porous graphene shells were synthesized, which showed higher efficiency compared to bare Pt and maintaining long-term stability after extended potential cycling which is due to the protective effect of graphene shells. Also, our sequential CVD techniques for bimetallic Pt-Co nanocatalyst are efficient for the quick, simple and easy synthesis of optimal catalytic structure. This technique is very useful for lowering the synthetic temperature of metal alloys by more than 200�?°C compared to conventional processes. Recent Publications 1. Tom Samuels, et al. (2017) Three-dimensional hybrid multi-layered graphene-CNT catalyst supports via rapid thermal annealing of nickel acetate. Journal of Materials Chemistry A; 21(5): 10457-10469. 2. D S Choi, et al. (2016) Low-temperature chemical vapor deposition synthesis of Pt-Co alloyed nanoparticles with enhanced oxygen reduction reaction catalysis. Advanced Materials; 28: 7115-7122.
Heeyeon Kim has completed her PhD in Chemical Engineering from Seoul National University. She is being working in Korea Institute of Energy Research since 2004. She has investigated nano metals, nano carbons and their hybrids for energy applications. The main applications of the metal-carbon hybrids are catalysts for low temperature fuel cell, the catalysts for hydrogen production, the CO2 absorbents and the electrode material of secondary battery. The focus of her study is to develop cost-effective materials which improve the catalytic performance and concurrently maintain the long-term stability.
E-mail: heeyeon@kier.re.kr