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Highly tuneable proton-conducting coordination polymers derived from a sulfonate-based ligand

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Abstract

Developing a new type of high-performing proton-conducting electrolyte associated with proton exchange membrane fuel cells (PEMFCs) is one of the attractive and challenging topics in the modern energy field. Here, three coordination compounds have been synthesized via the HCl steaming-assisted conversion approach by using multiple functional groups including the sulfonate group and the Cl or HPO42− group, namely, Cu2H2(Hspip)2Cl4·H2O (1), Cu(H2spip)Cl2·H2O (2) and CuH(Hspip)(HPO4)·H2O (3) (where H2spip is 2-sulfophenylimidazo(4,5-f)(1,10)-phenanthroline). We disclose the relationship between the structure characteristics and the nature of proton conductivity. The protonated sulfonate group together with the halide Cl group plays a positive role in increasing proton conductivity; meanwhile, the packing mode of the structure is also an important factor influencing proton conduction. The compounds exhibit high proton conductivity values in the range of 10−4–10−2 S cm−1 at 95 °C and 97% relative humidity (RH), in which compound 2 exhibited the highest value of 1.09 × 10−2 S cm−1 at 97% RH and 368 K.

Graphical abstract: Highly tuneable proton-conducting coordination polymers derived from a sulfonate-based ligand

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Publication details

The article was received on 03 Sep 2017, accepted on 05 Nov 2017 and first published on 06 Nov 2017


Article type: Paper
DOI: 10.1039/C7CE01589E
Citation: CrystEngComm, 2017, Advance Article
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    Highly tuneable proton-conducting coordination polymers derived from a sulfonate-based ligand

    M. Wei, J. Fu, Y. Wang, Y. Zhang, H. Zang, K. Shao, Y. Li and Z. Su, CrystEngComm, 2017, Advance Article , DOI: 10.1039/C7CE01589E

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