01828nas a2200181   4500008004100000245013300041210006900174260000800243300001400251520110400265100002001369700002401389700002301413700001801436700003201454700003001486856013001516       2016                        eng d00a10000-Fold enhancement in proton conduction by doping of cesium ions in a proton-conducting zwitterionic metal-organic framework0 a10000Fold enhancement in proton conduction by doping of cesium i  cSEP  a4382-43863 aDeveloping metal-organic framework (MOF)-based proton-conducting electrolytes for fuel-cell applications is an important target that has drawn a lot of attention. A key approach involves the selective replacement of the guest species within the pores to enhance performance. The modular and crystalline nature of the MOF permits controlled introduction of such species and characterization of their compositions with high precision, a task which is very difficult to achieve in amorphous polymers. Herein, we partially replaced the protons of a zwitterionic pyridinol in Mg(terephthalate)(pyridinol) MOF 1 with Cs+ ions, which brought about a 10000-fold increase in the proton conductivity (10(-6) to 10(-2) S cm(-1)). Interestingly, Li+ ions could not be loaded, whereas Cs+ ions with smaller hydrated ionic radii could be loaded, and the loading was controlled as a function of time. The Cs+ loading nearly halved the activation energy (from 0.35 for 1 to 0.19 eV for _Cs). The highest conductivities were realized for an optimal loading of Cs+ ions, which was found to be about 10 % in this case.1 aShalini, Sorout1 aAggarwal, Shubhangi1 aSingh, Santosh, K.1 aDutt, Malvika1 aAjithkumar, Thallaseril, G.1 aVaidhyanathan, Ramanathan  uhttps://library.ncl.res.in/content/10000-fold-enhancement-proton-conduction-doping-cesium-ions-proton-conducting-zwitterionic