A 3D open-framework iron hydrogenophosphate showing high proton conductance under water and aqua-ammonia vapor
Hai-Rong Zhao1,2, Yin Jia2, Yi Gu2
1State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Molecular Engineering, Nanjing Tech University Nanjing 210009 P. R. China njutljl@163.com.
Abstract:
Herein we report the first example of the proton conductivity of an open-framework metal phosphate (NH3(CH2)3NH3)2-[Fe4(OH)3(HPO4)2(PO4)3]·4H2O under aqua-ammonia vapor. Its optimized proton conductivity is 5 × 10-2 S cm-1 at 313 K and aqua-ammonium vapor from 1 M NH3·H2O solution. That is approximately two orders of magnitude greater than the maximum value under water vapor (8.0 × 10-4 S cm-1 at 317 K and 99% RH). The proton transfer mechanism has been proposed in terms of the structural analyses, activation energy calculations, and PXRD determinations.
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