Kim, Sunhyung Han, Jonghee Kwon, Yongchai Lee, Kug-Seung Lim, Tae-Hoon Nam, Suk Woo Jang, Jong Hyun 2024-01-20T16:05:21Z 2024-01-20T16:05:21Z 2021-09-04 2011-09-30 0013-4686 https://pubs.kist.re.kr/handle/201004/129976 Using platinum (Pt) black and carbon-supported Pt (Pt/C) as cathode catalysts, membrane-electrode assemblies (MEAs) were fabricated with various Nafion ionomer content, and their direct formic acid fuel cell (DFAFC) performances were investigated. In MEAs incorporating Pt black catalysts, the current density at 0.6 V was highest at ionomer/catalyst volume ratio of 1.0, which was consistent with the electrochemical active area (EAS) variation measured by cyclic voltammetry. However, the current density measured at 0.3 V, the cell performance increased with Nation ionomer content, especially at low ionorner loading, indicating that proton transport rate played an important role. The variation in ionic resistance (R-ion) of cathode layers with Nation ionomer content was experimentally confirmed by using the complex capacitance analysis of impedance data implemented with nitrogen (cathodes)/hydrogen (anodes) atmosphere. For Pt/C, the layer thickness and EAS of cathode were larger than those of MEA cathode using Pt black; and the current densities at 0.6V were lower than those of Pt black, suggesting that smaller fraction of EAS was utilized. (C) 2011 Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD PD CATALYST METHANOL PERFORMANCE ELECTROOXIDATION PEMFC ELECTRODES BLACK DMFC Effect of Nafion ionomer and catalyst in cathode layers for the direct formic acid fuel cell with complex capacitance analysis on the ionic resistance Article 10.1016/j.electacta.2011.02.005 1 ELECTROCHIMICA ACTA, v.56, no.23, pp.7984 - 7990 ELECTROCHIMICA ACTA 56 23 7984 7990 scie scopus 000295437500028 2-s2.0-80052738636 Electrochemistry Electrochemistry Article; Proceedings Paper PD CATALYST METHANOL PERFORMANCE ELECTROOXIDATION PEMFC ELECTRODES BLACK DMFC Direct formic acid fuel cells Platinum catalyst Impedance spectroscopy Complex capacitance analysis Ionic resistance