Research output: Contribution to journal › Article › peer-review
Effect of the excess protons on the electrotansport, structural and thermodynamic properties of CsH2PO4. / Ponomareva, V. G.; Lavrova, G. V.
In: Solid State Ionics, Vol. 304, 01.06.2017, p. 90-95.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Effect of the excess protons on the electrotansport, structural and thermodynamic properties of CsH2PO4
AU - Ponomareva, V. G.
AU - Lavrova, G. V.
PY - 2017/6/1
Y1 - 2017/6/1
N2 - The influence of the small deviations of Cs:P ratio in CsH2PO4 has been firstly investigated. The influence of small amounts of H3PO4 or CsH5(PO4)2 additives (xmole = 0.002–0.05) on the electrotransport, structural and thermal properties of CsH2PO4 has been investigated by impedance and IR spectroscopy, XRD and DSC methods. Effect of the acidic centers on the proton conductivity was discovered. The doping of CsH2PO4 up to x ≤ 0.03 is virtually invisible effect for X-ray diffraction and IR methods, but influences on the superionic phase transition, thermodynamic characteristics and increases significantly the low-temperature conductivity. The superionic phase transition becomes more diffusive and moves to the lower temperatures up to ~ 200 °C. According to XRD the formation of (1 − x)CsH2PO4 − xCsH5(PO4)2 composite electrolyte based on two ionic salts was observed for both types of dopants. The addition of CsH5(PO4)2 (0.2 mol%) increases a low temperature conductivity of CsH2PO4 by more than one order of magnitude and decreases the activation energy of conductivity at the same time. The low-temperature conductivity enhances up to σ160°C ~ 10− 3 S·cm− 1 with Ea = 0.65 eV at x = 0.05. The doping of CsH2PO4 up to 5 mol% does not influence significantly on the high-temperature conductivity.
AB - The influence of the small deviations of Cs:P ratio in CsH2PO4 has been firstly investigated. The influence of small amounts of H3PO4 or CsH5(PO4)2 additives (xmole = 0.002–0.05) on the electrotransport, structural and thermal properties of CsH2PO4 has been investigated by impedance and IR spectroscopy, XRD and DSC methods. Effect of the acidic centers on the proton conductivity was discovered. The doping of CsH2PO4 up to x ≤ 0.03 is virtually invisible effect for X-ray diffraction and IR methods, but influences on the superionic phase transition, thermodynamic characteristics and increases significantly the low-temperature conductivity. The superionic phase transition becomes more diffusive and moves to the lower temperatures up to ~ 200 °C. According to XRD the formation of (1 − x)CsH2PO4 − xCsH5(PO4)2 composite electrolyte based on two ionic salts was observed for both types of dopants. The addition of CsH5(PO4)2 (0.2 mol%) increases a low temperature conductivity of CsH2PO4 by more than one order of magnitude and decreases the activation energy of conductivity at the same time. The low-temperature conductivity enhances up to σ160°C ~ 10− 3 S·cm− 1 with Ea = 0.65 eV at x = 0.05. The doping of CsH2PO4 up to 5 mol% does not influence significantly on the high-temperature conductivity.
KW - Additional acidic centers
KW - CsHPO
KW - Proton conductivity
KW - ACID FUEL-CELLS
KW - BEHAVIOR
KW - ELECTRICAL-CONDUCTIVITY
KW - CESIUM DIHYDROGEN PHOSPHATE
KW - TEMPERATURE PHASE-TRANSITIONS
KW - BULK
KW - RB
KW - CONDUCTORS
KW - CsH2PO4
KW - SURFACE
KW - METAL
UR - http://www.scopus.com/inward/record.url?scp=85016939241&partnerID=8YFLogxK
U2 - 10.1016/j.ssi.2017.03.026
DO - 10.1016/j.ssi.2017.03.026
M3 - Article
AN - SCOPUS:85016939241
VL - 304
SP - 90
EP - 95
JO - Solid State Ionics
JF - Solid State Ionics
SN - 0167-2738
ER -
ID: 10264639