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Core-Shell Nanocatalysts for Applications in Fuel Cells and Water Electrolysis

J.X. Wang, C. Ma, Y. Zhu, Y. Zhange, R. Si, Y-C. Hsieh, M. Vukmirovic, K. Sasaki, R.R. Adzic
Brookhaven National Laboratory, US

Keywords: core-shell nanocatalyst, hydrogen evolution and oxidation, water electrolysis, oxygen reduction, fuel cells

Abstract:

Core-shell nanoparticle catalysts have attracted considerable attention because such ordering maximizes the use of precious metals by locating them at the surface on suitable core materials that enhance their catalytic activities. We present here syntheses, characterization, and catalytic performances of three core-shell nanocatalysts. First, we show well-defined core-shell nanoparticles fabricated via layer-by-layer deposition of Pt on Pd core using atomically resolved images. Second, we demonstrate the formation of compact, nonporous Pt hollow nanoparticles by galvanic replacement of Ni templates, and its high ORR activity and remarkable durability. Third, we discuss structural optimization of Ru(core)-Pt(shell) catalysts for hydrogen evolution reaction (HER) in water-electrolysis hydrogen generators. The Pd(core)-Pt(monolayer) catalysts have been tested by Toyota Motor Corporation, and its multi-gram quantity production is being developed by several companies. We would like discuss with interested catalyst producers or venture capital investors about scale-up syntheses and commercialization of the other two catalysts.
 
 
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