Yoo, Sung Jong Cho, Yong-Hun Park, Hyun-Seo Lee, Joong Kee Sung, Yung-Eun 2024-01-20T23:31:48Z 2024-01-20T23:31:48Z 2021-08-31 2008-04-01 0378-7753 https://pubs.kist.re.kr/handle/201004/133565 Pt nanocatalysts formed on a gas diffusion layer substrate for use in proton exchange membrane fuel cells were fabricated by using a high-pressure sputtering technique in a gaseous mixture of Ar and He. Rather than the dense film deposited by conventional sputtering techniques, the resulting structure was comprised of a porous Pt nanocatalyst layer with an average particle size of 8.9 nm. The porous Pt nanocatalysts were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and X-ray absorption near edge spectroscopy. Compared with the dense Pt catalyst layer, the electrochemical activated surface of the porous Pt nanocatalyst layer, measured using cyclic voltammetry, was enhanced about 250%. Polarization characteristics of the membrane electrode assembly, which utilized the porous Pt nanocatalyst layer in the proton exchange membrane fuel cells, showed that the maximum power density per unit area increased with an increase in the sputtering pressure. The high performance of Pt nanocatalysts fabricated at a sputtering pressure of 200 mTorr (Ar/He = 1) was due to miniaturization of the Pt particles and formation of the porous catalyst layer. (C) 2007 Elsevier B.V. All rights reserved. English ELSEVIER FUEL-CELL ULTRA-LOW PERFORMANCE PLATINUM LAYER ELECTROCATALYSTS EDGE High utilization of Pt nanocatalysts fabricated using a high-pressure sputtering technique Article 10.1016/j.jpowsour.2007.09.098 1 JOURNAL OF POWER SOURCES, v.178, no.2, pp.547 - 553 JOURNAL OF POWER SOURCES 178 2 547 553 scie scopus 000254680500007 2-s2.0-39849097879 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article; Proceedings Paper FUEL-CELL ULTRA-LOW PERFORMANCE PLATINUM LAYER ELECTROCATALYSTS EDGE Pt nanocatalysts sputtering technique proton exchange membrane fuel cells (PEMFCs) utilization of Pt