National Changhua University of Education Institutional Repository : Item 987654321/14227
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题名: Synthesis of Superconducting Cobalt Oxyhydrates Using a Novel Method: Electrolyzed and Oxidized Water
作者: Liu, Chia-Jyi;Wu, Tsung-Hsien;Hsu, Lin-Li;Wang, Jung-Sheng;Chen, Shu-Yo
贡献者: 物理學系
关键词: Superconductors;Sodium cobalt oxyhydrates;Electrolyzed and oxidized water
日期: 2007-09
上传时间: 2012-09-10T06:15:11Z
出版者: Elsevier
摘要: By deintercalation of Na+ followed by inserting bilayers of water molecules into the host lattice, the layered cobalt oxide of γ-Na0.7CoO2 undergoes a topotactic transformation to a layered cobalt oxyhydrate of Na0.35(H2O)1.3CoO2−δ with the c-axis expanded from c ≈ 10.9 Å to c ≈ 19.6 Å. In this paper, we demonstrate that the superconducting phase of c ≈ 19.6 Å can be directly obtained by simply immersing γ-Na0.7CoO2 powders in electrolyzed/oxidized (EO) water, which is readily available from a commercial electrolyzed water generator. We found that high oxidation–reduction potential of EO water drives the oxidation of the cobalt ions accompanying by the formation of the superconductive c ≈ 19.6 Å phase. Our results demonstrate how EO water can be used to oxidize the cobalt ions and hence form superconducting cobalt oxyhydrates in a clean and simple way and may provide an economic and environment-friendly route to oxidize the transition metal of complex metal oxides.
關聯: Physica C: Superconductivity, 460-462: 493-494
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