title: Water assisted high proton conductance in a highly thermally stable and superior water-stable open-framework cobalt phosphate.
abstract: Proton-conducting materials show important technological applications as key components in energy conversion, electrochemical sensing and electrochromic devices; the exploration for new types of proton-conducting materials is crucial for the development of efficient electrochemical devices. In this study, we investigated the proton transport nature of an inorganic-organic hybrid crystal of open-framework cobalt phosphate, (C2N2H10)0.5CoPO4. The structure of the hybrid crystal consists of the [CoPO4]-∞anionic framework, and the proton carriers, H2en2+cations (en = ethylenediamine), are located in the pores to compensate the negative charges of the inorganic framework. The open-framework is thermally stable up to 653 K (380 °C) at least, and also shows superior water stability. The open-framework exhibits negligible conductance in an anhydrous environment even at 473 K; however, there is evident water-assisted proton conduction. The conductivity reaches 2.05 × 10-3S cm-1at 329 K and 98% RH. Such high proton conductivity can compete with numerous state-of-the-art MOFs/PCPs-based proton conductors, and this material has promising applications in diverse electrochemical devices.
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 210009, P. R. China and College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, P. R. China.
authors.forename: Mei
authors.initials: M
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 210009, P. R. China and College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, P. R. China.
authors.forename: Hong-Bin
authors.initials: HB
authors.lastname: Luo
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 210009, P. R. China and College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, P. R. China.
authors.forename: Shao-Xian
authors.initials: SX
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 210009, P. R. China and College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, P. R. China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Zou
authors.affiliation: Hubei Key Laboratory for Processing and Application of Catalytic Materials, Huanggang Normal University, Huanggang 438000, P. R. China.
authors.forename: Zheng-Fang
authors.initials: ZF
authors.lastname: Tian
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 210009, P. R. China and College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, P. R. China.
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 210009, P. R. China and College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, P. R. China.
authors.forename: Jian-Lan
authors.initials: JL
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 210009, P. R. China and College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, P. R. China and State Key Laboratory of Coordination Chemistry, Nanjing University, 210093, P. R. China. xmren@njtech.edu.cn.
authors.forename: Xiao-Ming
authors.initials: XM
authors.lastname: Ren