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Simple synthesis of ironIII sulfophenyl phosphate nanosheets as a high temperature inorganic–organic proton conductor

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Abstract

IronIII sulfophenyl phosphate (FeSPP) is successfully synthesized by an optimized process from the reaction of ironIII chloride and m-sulfophenyl phosphonic acid (msPPA) by a simple and environmentally friendly method. Experimental results show FeSPP has a kind of layered structure, and multilayer sheet is about 2 nm thick. FeSPP exhibits good thermal stability and does not decompose under 200 °C. Protons transfer through vehicle and Grotthuss mechanisms at different relative humidities (RH). The conductivity of FeSPP can reach to 0.115 S/cm at 180 °C and RH = 100 %. Under this condition, vehicle mechanism plays the leading role, and the Grotthuss mechanism plays the minor role. At low RH, Grotthuss plays the leading role, and vehicle plays the minor role. In a drying oven at 180 °C, the proton conductivity remains 2.15 × 10−3 S/cm. Good conductivities at different RH and thermal stabilities clearly demonstrate that FeSPP is a highly effective conductor. It can be used as catalysts, chemical sensors, and in the preparation of composite membrane.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (grant nos. 21276148, 21076119, and 20776081), the State Key Laboratory of Chemical Engineering (Tianjin University) (Grant no. SKL-ChE-14B01), and the Natural Science Foundation of Shandong Province, China (grant no. ZR2010BM004)

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  1. School of Chemical Engineering, Shandong University of Technology, 12# Zhangzhou Road, Zibo City, 255049, Shandong Province, People’s Republic of China

    Guohong Liu, Zhongfang Li, Lei Jin & Suwen Wang

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  1. Guohong Liu
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  2. Zhongfang Li
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  3. Lei Jin
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  4. Suwen Wang
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Correspondence to Zhongfang Li.

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Liu, G., Li, Z., Jin, L. et al. Simple synthesis of ironIII sulfophenyl phosphate nanosheets as a high temperature inorganic–organic proton conductor. Ionics 20, 1399–1406 (2014). https://doi.org/10.1007/s11581-014-1109-0

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  • DOI: https://doi.org/10.1007/s11581-014-1109-0

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