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Effect of Oxygen Implantation on the Electrochemical Properties of Palladium

Published online by Cambridge University Press:  21 February 2011

Takanobu Fujihana ,
Masato Ueshima ,
Katsuo Takahashi  and
Masaya Iwaki
Takanobu Fujihana
Affiliation:
Advanced Technology Inc., 84 Nase, Totsuka, Yokohama, Kanagawa, 245 Japan
Masato Ueshima
Affiliation:
Gakushuin University, 1-5-1 Mejiro, Toshima, Tokyo, 171 Japan
Katsuo Takahashi
Affiliation:
The Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako, Saitama, 351-01 Japan
Masaya Iwaki
Affiliation:
The Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako, Saitama, 351-01 Japan
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Abstract

The electrochemical properties of O+-implanted Pd measured by cyclic voltammetry in a 0.25 mol dm-3 H2SO4 solution were investigated in relation to their composition and structure. Implantation of 16O+ was performed with doses between 1O17 and 1O18 ions cm-2 at 150 keV, and at nearly room temperature. SIMS, ERD combined with RBS, and XRD were used to analyze the composition depth profile and structure of O+-implanted Pd surface layers. The H atoms were accumulated with a gaussian distribution and carbon materials containing the solid solution of PdCx (x=0.13-0.15) were also formed in the near surface layers during O+-implantation. The distribution of implanted oxygen changed from gaussian to trapezoidal as the dose increased, accompanied by the crystal growth of Pd(OH)2, and simultaneously, the amount of accumulated H atoms increased. The voltammetric measurements revealed that with an increase in the dose, the hydrogen absorption was suppressed at the early stage of sweep cycles, and at the final stage, the redox reaction of both hydrogen and Pd was activated. From these results, we propose that the carbon materials containing the PdCx formed during O+-implantation suppress the hydrogen absorption, and the metallic Pd like a Pd-black formed by the reduction of Pd(OH)2 during voltammetric measurements causes the electrochemical activation of O+-implanted Pd.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 354: Symposium A – Beam Solid Interactions for Materials Synthesis and Characterization , 1994 , 287
Copyright
Copyright © Materials Research Society 1995

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