Proton Conduction Study on Water Confined in Channel or Layer Networks of LaIIIMIII(ox)3路10H2O (M = Cr, Co, Ru, La)

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• 作者：Hisashi O虆kawa ; Masaaki Sadakiyo ; Kazuya Otsubo ; Ko Yoneda ; Teppei Yamada ; Masaaki Ohba ; Hiroshi Kitagawa
• 刊名：Inorganic Chemistry
• 出版年：2015
• 出版时间：September 8, 2015
• 年：2015
• 卷：54
• 期：17
• 页码：8529-8535
• 全文大小：545K
• ISSN：1520-510X

文摘

Proton conduction of the La<sup>IIIsup>M<sup>IIIsup> compounds, LaM(ox)<sub>3sub>路10H<sub>2sub>O (abbreviated to LaM; M = Cr, Co, Ru, La; ox<sup>2鈥?/sup> = oxalate) is studied in view of their networks. LaCr and LaCo have a ladder structure, and the ladders are woven to form a channel network. LaRu and LaLa have a honeycomb sheet structure, and the sheets are combined to form a layer network. The occurrence of these structures is explained by the rigidness versus flexibility of [M(ox)<sub>3sub>]<sup>3鈥?/sup> in the framework with large La<sup>IIIsup>. The channel networks of LaCr and LaCo show a remarkably high proton conductivity, in the range from 1 脳 10<sup>鈥?sup> to 1 脳 10<sup>鈥?sup> S cm<sup>鈥?sup> over 40鈥?5% relative humidity (RH) at 298 K, whereas the layer networks of LaCr and LaCo show a lower proton conductivity, 鈭? 脳 10<sup>鈥?sup> S cm<sup>鈥?sup> (40鈥?5% RH, 298 K). Activation energy measurements demonstrate that the channels filled with water molecules serve as efficient pathways for proton transport. LaCo was gradually converted to La<sup>IIIsup>Co<sup>IIsup>(ox)<sub>2.5sub>路4H<sub>2sub>O, which had no channel structure and exhibited a low proton conductivity of less than 1 脳 10<sup>鈥?0sup> S cm<sup>鈥?sup>. The conduction鈥搉etwork correlation of LaCo(ox)<sub>2.5sub>路4H<sub>2sub>O is reported.