Structure sensitivity of the low-temperature ionic conductivity of NaCl crystals

1957 ◽  
Vol 2 (3) ◽  
pp. 226-231 ◽  
Author(s):  
D.B. Fischbach ◽  
A.S. Nowick
Keyword(s):  
Ionic Conductivity ◽  
Low Temperature ◽  
Structure Sensitivity

scholarly journals A Bulk-Heterostructure Nanocomposite Electrolyte of Ce0.8Sm0.2O2-δ–SrTiO3 for Low-Temperature Solid Oxide Fuel Cells

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Yixiao Cai ◽  
Yang Chen ◽  
Muhammad Akbar ◽  
Bin Jin ◽  
Zhengwen Tu ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Ionic Conductivity ◽  
Low Temperature ◽  
Solid Oxide Fuel Cells ◽  
Short Circuit ◽  
Solid Oxide ◽  
Superior Performance ◽  
Electrode Polarization ◽  
Oxide Fuel ◽  
Ac Impedance Analysis

AbstractSince colossal ionic conductivity was detected in the planar heterostructures consisting of fluorite and perovskite, heterostructures have drawn great research interest as potential electrolytes for solid oxide fuel cells (SOFCs). However, so far, the practical uses of such promising material have failed to materialize in SOFCs due to the short circuit risk caused by SrTiO3. In this study, a series of fluorite/perovskite heterostructures made of Sm-doped CeO2 and SrTiO3 (SDC–STO) are developed in a new bulk-heterostructure form and evaluated as electrolytes. The prepared cells exhibit a peak power density of 892 mW cm−2 along with open circuit voltage of 1.1 V at 550 °C for the optimal composition of 4SDC–6STO. Further electrical studies reveal a high ionic conductivity of 0.05–0.14 S cm−1 at 450–550 °C, which shows remarkable enhancement compared to that of simplex SDC. Via AC impedance analysis, it has been shown that the small grain-boundary and electrode polarization resistances play the major roles in resulting in the superior performance. Furthermore, a Schottky junction effect is proposed by considering the work functions and electronic affinities to interpret the avoidance of short circuit in the SDC–STO cell. Our findings thus indicate a new insight to design electrolytes for low-temperature SOFCs.

Hydrothermal synthesis and ionic conductivity of CdF2 and low-temperature modifications of PbF2 and PbSnF4

2002 ◽  
Vol 47 (4) ◽  
pp. 695-700 ◽  
Author(s):  
O. K. Nikol’skaya ◽  
L. N. Demianets ◽  
N. I. Sorokin
Keyword(s):  
Hydrothermal Synthesis ◽  
Ionic Conductivity ◽  
Low Temperature

Structure sensitivity of low-temperature NO decomposition on Au surfaces

2013 ◽  
Vol 304 ◽  
pp. 112-122 ◽  
Author(s):  
Zongfang Wu ◽  
Lingshun Xu ◽  
Wenhua Zhang ◽  
Yunsheng Ma ◽  
Qing Yuan ◽  
...  
Keyword(s):  
Low Temperature ◽  
Structure Sensitivity ◽  
No Decomposition

scholarly journals Remarkable Ionic Conductivity in a LZO-SDC Composite for Low-Temperature Solid Oxide Fuel Cells

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2277
Author(s):  
Zhengwen Tu ◽  
Yuanyuan Tian ◽  
Mingyang Liu ◽  
Bin Jin ◽  
Muhammad Akbar ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Ionic Conductivity ◽  
Low Temperature ◽  
Solid Oxide Fuel Cells ◽  
Ionic Conduction ◽  
Open Circuit ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Open Circuit Voltages ◽  
Composite Samples

Recently, appreciable ionic conduction has been frequently observed in multifunctional semiconductors, pointing out an unconventional way to develop electrolytes for solid oxide fuel cells (SOFCs). Among them, ZnO and Li-doped ZnO (LZO) have shown great potential. In this study, to further improve the electrolyte capability of LZO, a typical ionic conductor Sm0.2Ce0.8O1.9 (SDC) is introduced to form semiconductor-ionic composites with LZO. The designed LZO-SDC composites with various mass ratios are successfully demonstrated in SOFCs at low operating temperatures, exhibiting a peak power density of 713 mW cm−2 and high open circuit voltages (OCVs) of 1.04 V at 550 °C by the best-performing sample 5LZO-5SDC, which is superior to that of simplex LZO electrolyte SOFC. Our electrochemical and electrical analysis reveals that the composite samples have attained enhanced ionic conduction as compared to pure LZO and SDC, reaching a remarkable ionic conductivity of 0.16 S cm−1 at 550 °C, and shows hybrid H+/O2− conducting capability with predominant H+ conduction. Further investigation in terms of interface inspection manifests that oxygen vacancies are enriched at the hetero-interface between LZO and SDC, which gives rise to the high ionic conductivity of 5LZO-5SDC. Our study thus suggests the tremendous potentials of semiconductor ionic materials and indicates an effective way to develop fast ionic transport in electrolytes for low-temperature SOFCs.

Low-Temperature Prepared Multi-Elements Doped CeO2 Electrolyte

2009 ◽  
Author(s):  
Horng-Yi Chang ◽  
Yao-Ming Wang
Keyword(s):  
Ionic Conductivity ◽  
Low Temperature ◽  
Mixed Oxide ◽  
Sintering Temperature ◽  
Solid Oxide ◽  
Evaporation Method ◽  
Pure Phase ◽  
Doped Ceo2 ◽  
Oxide Ionic Conductivity ◽  
Homogeneous Composition

CeO2 materials doped with the di- or tri-valent metals possess high oxide ionic conductivity at low temperature for potential electrolyte use in intermediate temperature solid oxide fuel cell (SOFC). However, multi-elements doped CeO2-based electrolyte, (La1-x-ySrxBay)0.175Ce0.825O2-δ (LSBC) in this work, with pure phase is difficultly synthesized at low calcination temperature. High sintering temperature, e.g. > 1500°C, is also needed in conventional mixed oxide method. In this work, nanoparticles less than 50nm of LSBC can be prepared by solution-evaporation method at constant temperature. Pure fluorite crystal structure can be obtained lower than 700°C. The optimal mole ratio of LSBC/citric acid in prepared solution is 1/2 to achieve homogeneous composition and pure phase of LSBC. Small grain size of about 1μm average is observed for 1300°C-microwave sintered LSBC by solution-evaporation method. The ionic conductivity of 1400°C-conventional sintered and 1300°C-microwave sintered LSBC prepared by solution-evaporation method is about 0.006 S/cm at 600°C but less than 0.004 S/cm at 600°C even for 1500°C-conventional sintered LSBC prepared by mixed oxide method.

scholarly journals Ionic Liquid Electrolytes for Safer and More Reliable Sodium Battery Systems

2020 ◽  
Vol 10 (18) ◽  
pp. 6323 ◽  
Author(s):  
Mariangela Bellusci ◽  
Elisabetta Simonetti ◽  
Massimo De Francesco ◽  
Giovanni Battista Appetecchi
Keyword(s):  
Thermal Stability ◽  
Ionic Liquid ◽  
Ionic Conductivity ◽  
Low Temperature ◽  
Room Temperature ◽  
Side Chain ◽  
Electrolyte Mixtures ◽  
Sodium Battery ◽  
Sodium Batteries ◽  
Battery Systems

Na+-conducting, binary electrolytic mixtures, based on 1-ethyl-3-methyl-imidazolium, trimethyl-butyl-ammonium, and N-alkyl-N-methyl-piperidinium ionic liquid (IL) families, were designed and investigated. The anions were selected among the per(fluoroalkylsulfonyl)imide families. Sodium bis(trifluoromethylsulfonyl)imide, NaTFSI, was selected as the salt. The NaTFSI-IL electrolytes, addressed to safer sodium battery systems, were studied and compared in terms of ionic conductivity and thermal stability as a function of the temperature, the nature of the anion and the cation aliphatic side chain length. Room temperature conductivities of interest for sodium batteries, i.e., largely overcoming 10−4 or 10−3 S cm−1, are displayed. Similar conduction values are exhibited by the EMI-based samples even below −10 °C, making these electrolyte mixtures potentially appealing also for low temperature applications. The NaTFSI-IL electrolytes, with the exception of the FSI-ones, are found to be thermally stable up to 275 °C, depending on the nature of the cation and/or anion, thus extending their applicability above 100 °C and remarkably increasing the reliability and safety of the final device, especially in the case of prolonged overheating.

Effects of FEC Additive on the Low Temperature Performance of LiODFB-Based Lithium-Ion Batteries

2013 ◽  
Vol 724-725 ◽  
pp. 1025-1028
Author(s):  
Rong Xiang ◽  
Fa Qiang Li ◽  
Guo Feng Jia ◽  
Zheng Jun Peng ◽  
Qin Zhuge
Keyword(s):  
Ionic Conductivity ◽  
Low Temperature ◽  
Lithium Ion Batteries ◽  
Discharge Capacity ◽  
Lithium Ion ◽  
Electrochemical Measurements ◽  
Temperature Performance ◽  
Fluoroethylene Carbonate ◽  
Low Temperature Performance

The low temperature performance of LiFePO4/Li cells based on lithium oxalyldifluoroborate (LiODFB) with fluoroethylene carbonate (FEC) as addictive have been investigated. The result of ionic conductivity test shows that the use of 5% FEC can improve the conductivity of both LiPF6and LiODFB electrolytes at low temperature. The electrochemical measurements of the cells show that the use of FEC can effectively improve the discharge capacity and has better kinetics characteristics and low temperature performance. The LiODFB cell with FEC also exhibits excellent cycling retention of 88.8% after 50 cycles at-20°C.

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