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Surface Enhanced Raman Spectroscopy and Cyclic Voltammetry Studies of Ni-rich Oxide Nanowires as Electrode Materials

Published online by Cambridge University Press:  01 February 2011

Que Anh Nguyen ,
Yash V. Bhargava ,
Shawn A. Thorne ,
Tzipi Cohen-Hyams  and
Thomas M. Devine
Que Anh Nguyen
Affiliation:
[email protected], University of California, Berkeley, Materials Science & Engineering, 210 HMMB, Berkeley, CA, 94720, United States
Yash V. Bhargava
Affiliation:
[email protected], University of California, Materials Science & Engineering, Berkeley, CA, 94720, United States
Shawn A. Thorne
Affiliation:
[email protected], University of California, Materials Science & EngineeringBerkeley, CA, 94720, United States
Tzipi Cohen-Hyams
Affiliation:
[email protected], University of California, Materials Science & Engineering, Berkeley, CA, 94720, United States
Thomas M. Devine
Affiliation:
[email protected], University of California, Materials Science & Engineering, Berkeley, CA, 94720, United States
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Abstract

A novel electrode material for Ni metal hydride batteries, composed of electrochemically synthesized, Ni-rich oxide nanowires, was investigated in this study. The nanowires, grown on Alloy 600 in a high-temperature, high-pressure aqueous electrolyte, are typically 25nm in diameter and 5-10um long. Cyclic voltammetry, with surface enhanced Raman spectroscopy (SERS) suggests that anodic polarization of the wires converts Ni2+ species to Ni3+, present as γ–-NiOOH, the chemical phase involved in the charge/discharge reaction in Ni-MH batteries. The reversibility of the reaction was confirmed via multiple polarization cycles and SEM imaging. In addition, the current density and polarization behavior of the nanowires in 0.01M KOH solution is compared to that of planar NiO and Alloy 600. Results suggest that the nanowires, due to their higher surface area, achieves at least 10 times the current density (for a given apparent area) of the non-nanowire samples.

Keywords

NinanostructureRaman spectroscopy
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1100: Symposium JJ – Materials Research for Electrical Energy Storage , 2008 , 1100-JJ02-11
Copyright
Copyright © Materials Research Society 2008

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