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Studies of Modified Hydrogen Storage Intermetallic Compounds Used as Fuel Cell Anodes
ICEMS, Instituto Superior Técnico, TULisbon, Av. Rovisco Pais, 1049–001 Lisboa, Portugal
ICEMS, Nanoscale Science Group, Physics Department FCT / UNL, 2829-516 Caparica, Portugal
* Author to whom correspondence should be addressed.
Received: 6 September 2011; in revised form: 13 December 2011 / Accepted: 22 December 2011 / Published: 28 December 2011
Abstract: The possibility of substituting Pt/C with the hydrogen storage alloy MlNi3.6Co0.85Al0.3Mn0.3 as the anode active material of a proton exchange membrane fuel cell system has been analyzed. The electrochemical properties indicate that a much more electrochemically active anode is obtained by impregnating the active material loaded anode in a Nafion proton conducting polymer. Such performance improvement might result from the increase of three-phase boundary sites or length in the gas diffusion electrode where the electrochemical reaction occurs. The experimental data revealed that the membrane electrode assembly (MEA) shows better results when the anode active material, MlNi3.6Co0.85Al0.3Mn0.3, is treated with a hot alkaline KBH4 solution, and then chemically coated with 3 wt.% Pd. The MEA with the aforesaid modification presents an enhanced surface capability for hydrogen adsorption, and has been studied by molecular beam-thermal desorption spectrometry.
Keywords: hydride electrode; potassium borohydride; fuel cell anode; thermal desorption spectrometry
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MDPI and ACS Style
Chen, Y.; Santos, D.M.F.; Sequeira, C.A.C.; Lobo, R.F.M. Studies of Modified Hydrogen Storage Intermetallic Compounds Used as Fuel Cell Anodes. Crystals 2012, 2, 22-33.
Chen Y, Santos DMF, Sequeira CAC, Lobo RFM. Studies of Modified Hydrogen Storage Intermetallic Compounds Used as Fuel Cell Anodes. Crystals. 2012; 2(1):22-33.
Chen, Yun; Santos, Diogo M. F.; Sequeira, César A. C.; Lobo, Rui F. M. 2012. "Studies of Modified Hydrogen Storage Intermetallic Compounds Used as Fuel Cell Anodes." Crystals 2, no. 1: 22-33.