期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 38, 期 9, 页码 3614-3620出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2013.01.062
关键词
Oxygen reduction; Pd-based catalysts; Pd/CNT composites; Magnetron sputtering; Alkaline membrane fuel cells
资金
- Estonian Science Foundation [8666, 9323]
- CRDF-ETF [ESC2-2975-TR-09]
- Archimedes Foundation [3.2.0501.10-0011]
The electrochemical reduction of oxygen on Pd nanoparticle/multi-walled carbon nanotube (PdNP/MWCNT) catalysts was studied in acid and alkaline solutions using the rotating disk electrode (RDE) method. The PdNP/MWCNT nanocomposites were prepared by sputter-deposition of palladium onto the surface of MWCNTs. The surface morphology of the PdNP/MWCNT composites was characterised by scanning electron microscopy (SEM). The SEM images showed the formation of Pd nanolayers around MWCNTs. The RDE results revealed a high electrocatalytic activity of PdNP/MWCNT catalysts towards the oxygen reduction reaction (ORR) in alkaline media. Two Tafel regions with different slope can be distinguished. At low overpotentials the Tafel slope is close to -60 mV dec(-1) and at higher current densities the slope is approximately -100 mV dec(-1). The PdNP/MWCNT composite is a promising material to be used as a cathode catalyst for alkaline membrane fuel cells. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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