Fluoride‐Based Anion Doping: A New Strategy for Improving the Performance of Protonic Ceramic Conductors of the Form BaZrO3. Issue 10 (14th April 2020)

• Record Type: Journal Article
• Authors: Gao, Jun; Liu, Yinqiao; Meng, Yuqing; Hu, Ming; Brinkman, Kyle S.
• Is Part Of: ChemElectroChem. Volume 7:Issue 10(2020)
• Page Start: 2242
• Page End: 2247
• Publication Date: 2020-04-14
• Subjects: protonic ceramic conductor -- energy conversion and storage -- fluoride ion doping -- ab initio calculations -- BaZrO3; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.202000154
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: A new strategy is reported to improve the performance of BaZrO3 ‐based protonic ceramic conductors by substitution on the anion sublattice, specifically replacing F − in the O 2− site. The F − ‐doped material exhibited higher conductivity under both reducing and oxidizing atmospheres compared to the undoped oxide. Ab initio calculations and X‐ray photoelectron spectroscopy results showed that the improved performance can be attributed to weakened chemical bonding between the cations (A or B site) and the oxygen ions as a result of F − doping, resulting in improved oxygen mobility. Finally, improved performance was demonstrated by using BaZr0.8 Y0.2 O3‐ δ ‐ σ F σ (σ=0.1) as the electrolyte in protonic ceramic fuel cells measurements. The anions doping strategy shows great promise for the development of a new generation of high‐performance electrolyte materials. Abstract : Site for sore eyes : Improved protonic conductivity is achieved after fluoride ion doping in the oxygen site. The underlying mechanism of the enhanced mobility of charge carriers originates from weakened chemical bonding between the cations and oxygen ions in the perovskite materials.