Structure and proton conductivity of mechanochemically treated 50CsHSO4·50CsH2PO4 |
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| Institution: | 1. Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208, USA;2. School of Chemical & Environment Engineering, China University of Mining & Technology, Beijing 100083, China;1. STMicroelectronics, 850, rue Jean Monnet, F-38926 Crolles, France;2. IEMN UMR CNRS 8520, Institut d’Electronique, de Microélectronique et de Nanotechnologie, Avenue Poincaré, F-59652 Villeneuve d’Ascq, France;1. Laboratory of Advanced Materials and Catalytic Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China;2. Department of Chemical Engineering, University of South Carolina, Columbia, SC 29208, USA;1. Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208, United States;2. Science and Technology Directorate, Savannah River National Laboratory, Aiken, SC 29808, United States;1. Department of Organic and Inorganic Chemistry, Faculty of Sciences, University of Extremadura, Avda. de Elvas s/n, E-06071 Badajoz, Spain;2. Instituto de Ciencias de Materiales de Barcelona, ICMAB-CSIC, Campus de la Universitat Autonoma de Barcelona, E-08193 Bellaterra, Spain;3. Instituto Nacional del Carbón, INCAR-CSIC, Apartado 73, E-33080 Oviedo, Spain;1. A.F. Ioffe Physicotechnical Institute, St. Petersburg, Russia;2. Theoretical Physics Institute, Warsaw, Poland;3. School of Science, Loughborough University, Loughborough LE11 3TU, United Kingdom |
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| Abstract: | Mixtures of CsHSO4 and CsH2PO4 were mechanochemically treated using a planetary type of ball mill. The changes in structure and proton conductivity of the solid acid compounds with the treatment have been investigated. Cs3(HSO4)2(H2PO4) and Cs5(HSO4)3(H2PO4)2 were formed during milling. The mechanochemically treated composite consisting of Cs3(HSO4)2(H2PO4) and Cs5(HSO4)3(H2PO4)2 showed higher conductivity than the untreated mixture. In addition, a high temperature phase of Cs2(HSO4)(H2PO4) was generated from the composite at around 100 °C on heating. Conductivity of the mechanochemically treated composite significantly increased at temperatures around 90 °C on heating. The value becomes 2 × 10− 3 S cm− 1 at around 180 °C. On the other hand, no steep decrease is observed on cooling. The activation energies of the mechanically milled sample with high conductivities were estimated to be about 0.3 eV for both heating and cooling processes. The relatively high proton conductivity and a low activation energy for the proton conduction should be ascribed to the presence of the high temperature phase of Cs2(HSO4)(H2PO4). |
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