期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 39, 期 10, 页码 5148-5152出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2014.01.053
关键词
Direct ammonia fuel cell; PtIr/C; Electrocatalysts
资金
- FAPESP [2013/01577-0, 2011/18246-0, 2012/22731-4, 2012/03516-5]
- CNPq [150639/2013-9, 141469/2013-7]
Direct ammonia fuel cell (DAFC) performance was investigated using as anode PtIr/C electrocatalysts (Pt:Ir atomic ratios of 50:50, 70:30, 80:20 and 90:10) prepared by the borohydride reduction process and NH4OH 1.0, 3.0 and 5.0 mol L-1 in KOH 1.0 mol L-1 as fuel. Xray analyses of PtIr/C electrocatalysts suggested the formation of PtIr alloy and the transmission electron micrographs showed the average particle diameters between 4.5 and 6.0 nm. Using PtIr/C 50:50 electrocatalyst and NH4OH 5.0 mol L-1 in KOH 1.0 mol L-1 at 40 C a maximum power density was 48% and 70% higher than that obtained using Pt/C and Ir/C electrocatalysts, respectively. The increase of electroactivity using PtIr/C electrocatalysts might be related to a decrease of poisoning on catalyst surface by N-ads species and to an improved kinetic for ammonia oxidation reaction. Copyright (c) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reeerved.
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