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4596737 
Journal Article 
Nickel oxide hollow nano-fiber electrodes for electrochemical capacitors 
Machida, S; Tsutsumi, H 
2009 
CRC PRESS-TAYLOR & FRANCIS GROUP 
BOCA RATON 
62-65 
WOS:000273331000014 
Morphology of active materials in electrodes affects electrochemical performance and capacity of energy storage devices. New architectures, for example three-dimensional structure (3D), not a flat film, for electrodes and cells will overcome the traditional electrodes' problems such as low utilization of active materials, rate limit of ion diffusion. However, preparation of 3D electrodes needs complex, multi-step and high-cost processes. We prepared nickel oxide (NiO) hollow nano-fiber electrodes with the combination of the electrospinning and electroless plating techniques and evaluated their performance as electrodes for electrochemical capacitors. Non-woven mats with poly(methyl methacrylate) (PMMA) nano-fibers were prepared by electrospinning technique. Then the PMMA mats were immersed into the Ni electroless plating bath and the Ni-plated PMMA fibers were heated at 550 degrees C for 4h to remove the PMMA. The average outer diameter of the NiO hollow nano-fibers was 3 mu m and inside was 0.67 mu m. EDX analysis of the heat treated mats suggested that the follow fibers contain nickel oxide (NiO) with some phosphorous compounds and the PMMA in the mats as a mold is removed completely. The cyclic voltammograms for the NiO hollow nano-fiber electrode in the aqueous solution (I M KOH) indicated that the electrode is electrochemically active. The estimated capacity of the NiO hollow fiber electrode from the voltammograms was 190.5 F g(-1) (per gram of NiO). 
electrospinning; electroless plating; nickel oxide; capacitor; energy storage 
Laudon, M; Laird, DL; Romanowicz, B; 
978-1-4398-1787-2 
Clean Technology Conference and Expo 2009 
Houston, TX