| Autor: |
Hona RK; Environmental Science Department, United Tribes Technical College, Bismarck, ND 58504, USA., Azure AD; Engineering Department, United Tribes Technical College, Bismarck, ND 58504, USA.; Environmental Engineering Department, University of North Dakota, Grand Forks, ND 58202, USA., Guinn M; Environmental Science Department, United Tribes Technical College, Bismarck, ND 58504, USA., Phuyal US; School of Arts and Science, University of Mt. Olive, Mount Olive, NC 28365, USA., Stroh K; Environmental Science Department, United Tribes Technical College, Bismarck, ND 58504, USA., Thapa AK; Conn Center for Renewable Energy Research, University of Louisville, Louisville, KY 40292, USA. |
| Jazyk: |
angličtina |
| Zdroj: |
International journal of molecular sciences [Int J Mol Sci] 2023 Nov 28; Vol. 24 (23). Date of Electronic Publication: 2023 Nov 28. |
| DOI: |
10.3390/ijms242316855 |
| Abstrakt: |
Ternary glassy electrolytes containing K 2 S as a glass modifier and P 2 S 5 as a network former are synthesized by introducing a new type of complex and asymmetric salt, potassium triflate (KOTf), to obtain unprecedented K + ion conductivity at ambient temperature. The glasses are synthesized using a conventional quenching technique at a low temperature. In general, alkali ionic glassy electrolytes of ternary systems, specifically for Li + and Na + ion conductivity, have been studied with the addition of halide salts or oxysalts such as M 2 SO 4 , M 2 SiO 4 , M 3 PO 4 (M = Li or Na), etc. We introduce a distinct and complex salt, potassium triflate (KOTf) with asymmetric anion, to the conventional glass modifier and former to synthesize K + -ion-conducting glassy electrolytes. Two series of glassy electrolytes with a ternary system of (0.9-x)K 2 S-xP 2 S 5 -0.1KOTf (x = 0.15, 0.30, 0.45, 0.60, and 0.75) and z(K 2 S-2P 2 S 5 )-yKOTf (y = 0.05, 0.10, 0.15, 0.20, and 0.25) on a straight line of z(K 2 S-2P 2 S 5 ) are studied for their K + ionic conductivities by using electrochemical impedance spectroscopy (EIS). The composition 0.3K 2 S-0.6P 2 S 5 -0.1KOTf is found to have the highest conductivity among the studied glassy electrolytes at ambient temperature with the value of 1.06 × 10 -7 S cm -1 , which is the highest of all pure K + -ion-conducting glasses reported to date. Since the glass transition temperatures of the glasses are near 100 °C, as demonstrated by DSC, temperature-dependent conductivities are studied within the range of 25 to 100 °C to determine the activation energies. A Raman spectroscopic study shows the variation in the structural units PS43-, P2S74-, and P2S64- of the network former for different glassy electrolytes. It seems that there is a role of P2S74- and P2S64- in K + -ion conductivity in the glassy electrolytes because the spectroscopic results are compatible with the composition-dependent, room-temperature conductivity trend. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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