Investigating the role of GeO₂ in enhancing the thermal stability and proton mobility of proton-conducting phosphate glasses

Abstract

In this study, the effect of GeO2 on the thermal stability and proton mobility (μH) of proton-conducting phosphate glasses was experimentally investigated using 22HO1/2−3NaO1/2−(12−x)LaO3/2−xGeO2−63PO5/2 glasses. Increasing glass transition temperature (Tg)...

Anhydrous Silicophosphoric Acid Glass: Thermal Properties and Proton Conductivity

“…The activation energy, E a , for proton hopping conduction was determined to be 1.43 eV at T < T g and 1.15-1.85 eV at T � T g from the log(σT)-1/T plot (Figure S3). These E a values are much larger than those of previous protonconducting phosphate glasses (0.7-0.9 eV) with similar proton carrier densities (Figure S4), [20,21] despite the stronger hydrogen bonding in H 5 Si 2 P 9 O 29 glass. Further, the proton conductivity of H 5 Si 2 P 9 O 29 glass was not very high (3 × 10 À 6 S cm À 1 at T g ; 4 × 10 À 4 S cm À 1 at 276 °C).…”

Incorporation limit of MoO3 in sodium borosilicate glasses

“…To analyze the surfaces of the fresh samples, the glass samples were crushed in a nitrogen atmosphere‐glove box. The crushed samples were then transferred to the spectrometer (vacuum) under nitrogen atmosphere using a gas‐tight transfer vessel (PHI Model 04‐110, ULVAC‐PHI, Inc.) 35 . A charge neutralization system was used to avoid a shift in the spectra due to sample charging that irradiated low‐energy electron and ion beams on the sample surface during measurements.…”

“…The crushed samples were then transferred to the spectrometer (vacuum) under nitrogen atmosphere using a gas-tight transfer vessel (PHI Model 04-110, ULVAC-PHI, Inc.). 35 A charge neutralization system was used to avoid a shift in the spectra due to sample charging that irradiated low-energy electron and ion beams on the sample surface during measurements. The binding energies of the spectra were calibrated by using the standard value of the C 1s peak at 284.6 eV.…”

Enhancing proton mobility and thermal stability in phosphate glasses with WO3: the mixed glass former effect in proton conducting glasses

“…We experimentally confirmed that GeO 2 increases T g and m H at T g . 19 The increased T g is attributed to the formation of the P-O-Ge linkages tightly bridging between phosphate chains. The enhanced m H at T g is attributed to the increased ionicity of O-H bonds, resulting in the weakening of O-H bonds and the reduction of the energy barrier for proton dissociation from OH group, arising from the increased covalency of P-O bonds due to the formation of P-O-Ge bonds.…”