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Pd Modified MmNi 50.6 Co 10.2 Mn 5.4 Al 1.2 Alloy as the Catalyst of NaBH 4 Electrooxidation
Author(s) -
Cheng K.,
Xu Y.,
Miao R. R.,
Yang F.,
Yin J. L.,
Wang G. L.,
Cao D. X.
Publication year - 2012
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201100199
Subject(s) - alloy , hydrogen storage , chronoamperometry , materials science , catalysis , cyclic voltammetry , electrocatalyst , scanning electron microscope , hydrogen , borohydride , mischmetal , analytical chemistry (journal) , anode , inorganic chemistry , electrochemistry , chemical engineering , metallurgy , chemistry , electrode , composite material , chromatography , organic chemistry , engineering
A Pd‐modified hydrogen storage alloy was investigated as the anode electrocatalyst of direct borohydride fuel cell. The modification of the MmNi 50.6 Co 10.2 Mn 5.4 Al 1.2 hydrogen storage alloy with Pd was carried out by a self‐reduction reaction method. The morphology and the distribution of Pd on the surface of the alloy were observed by scanning electron microscope and energy dispersive X‐ray spectrometer. It was found that Pd particles uniformly distributed on the alloy surface and the content of Pd was 0.64 wt.%. The catalytic activity of the Pd‐modified hydrogen storage alloy for NaBH 4 electrooxidation was evaluated by cyclic voltammetry and chronoamperometry measurements. Results showed that Pd modification significantly enhanced the catalytic activity of the hydrogen storage alloy. In the 1.0 mol dm –3 NaOH+ 0.1 mol dm –3 NaBH 4 solution, the stabilized current density at –0.7 V was 34 and 22 mA cm –2 for the pristine and the Pd‐modified alloy, respectively. The utilization efficiency of NaBH 4 on the Pd‐modified alloy catalyst reached 45%, which is higher than that on the pristine alloy (30%). The number of electrons released by BH 4 – electrooxidation on Pd‐modified alloy was found to be close four.