Optimizing the Proton Conductivity with the Isokinetic Temperature in Perovskite‐Type Proton Conductors According to Meyer–Neldel Rule. Issue 5 (22nd December 2021)

• Record Type: Journal Article
• Authors: Du, Peng; Li, Nana; Ling, Xiao; Fan, Zhijun; Braun, Artur; Yang, Wenge; Chen, Qianli; Yelon, Arthur
• Is Part Of: Advanced energy materials. Volume 12:Issue 5(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-12-22
• Subjects: activation energy -- ceramic proton conductors -- isokinetic temperature -- lattice dynamics -- Meyer–Neldel rule -- proton conductivity; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.202102939
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: Perovskite‐type metal oxides such as Y‐doped BaMO3 (M = Zr/Ce) have drawn considerable attention as proton‐conducting electrolytes for intermediate temperature ceramic electrochemical cells. Improving the proton conductivity at lower temperatures requires a comprehensive understanding of the proton conduction mechanism. By applying high pressure or varying the Ce content of Y‐doped BaMO3, it is demonstrated that the proton conductivity follows the Meyer–Neldel rule (MNR) well. In the Arrhenius plot, the conductivities intersect at an isokinetic temperature, where the proton conductivity is independent of activation energy. Considering the relationship between isokinetic temperature and lattice vibration frequency, a high isokinetic temperature is observed in materials with stiff lattices, consisting of light atoms and small MO bond length. Based on consideration of the MNR, it is suggested that the enhancement of proton conductivity at low temperature can be well achieved by tuning lattice vibration frequency toward a desired isokinetic temperature. Abstract : In the Arrhenius plot, the conductivities intersect at an isokinetic temperature, where the proton conductivity is independent of activation energy. High isokinetic temperature is observed in materials with stiff lattices. This work suggests that the enhancement of proton conductivity at low temperature can be achieved by tuning lattice vibration frequency toward a desired isokinetic temperature.