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2. Nickel oxalate nanostructures for supercapacitorsElectronic supplementary information (ESI) available: Table S1: The mean areas of non-seeded regions denoted in Fig. 1. Fig. S1: Variation of pH associated with the addition of amounts of water to ethanolic 1 M oxalic acid. Fig. S2: Initial growth of nanowires prepared in ethanolic 1 M oxalic acid without water addition. Fig. S3: Enlarged view of Fig. 7, showing peaks in the range of 400–1000 cm−1. Fig. S4: Enlarged views of Fig. 8, showing double layer capacitance. See DOI: 10.1039/c0jm00279h

Author

Insoo Jung, Jinsub Choi, and Yongsug Tak

Abstract

Herein, we describe a facile method to produce nickel oxalate nanostructures by chemical reaction of oxalic acid and a nickel foil in various organic solvents and water. Grass-like structures consisting of nickel oxalate are produced by the chemical reaction within 30 min for all solvents. Interestingly, nickel oxalate nanowires can be produced by the addition of a small amount of water in certain solvents. Annealing of nickel oxalate structures leads to formation of nickel oxide structures with a slight morphological change. Compositions of the nanostructures are investigated by TEM and FT-IR analyses. In addition, the supercapacitance of the nickel oxalate nanostructures is characterized, and the results show that they are superior to that of nickel oxide nanostructures. [ABSTRACT FROM AUTHOR]

Published
2010
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