Im, Seunghyeok Berk, Muhammet Ali Yang, Sungeun Kim, Byung-Kook Yoon, Kyung Joong Son, Ji-Won Lee, Jong-Ho Ji, Ho-Il 2024-01-19T11:32:17Z 2024-01-19T11:32:17Z 2022-07-28 2022-08 2050-7488 https://pubs.kist.re.kr/handle/201004/114828 Triple ionic-electronic conducting oxides, in which electron holes, oxygen ions, and protons are simultaneously mobile, are garnering massive attention as potential oxygen electrodes in protonic ceramic cells. While their high electrocatalytic activity and proton transport ability generally provide opportunities for enhanced performance of electrochemical cells, the lack of fundamental knowledge on the proton uptake mechanism hinders the rational modification and design of materials. Herein, we investigate the proton uptake mechanism in double-perovskite PrBa0.5Sr0.5Co1.5Fe0.5O5+delta (PBSCF), a widely used triple ionic-electronic conducting oxide. The proton solubility of PBSCF is examined by direct observation of protons using secondary ion mass spectrometry. We then comprehensively discuss the correlations between previously hypothesized proton uptake mechanisms (hydration vs. hydrogenation) and experimentally measured properties such as mass and conductivity changes. This work provides a guideline for establishing the design principles of triple ionic-electronic conducting oxides based on mechanistic understanding. English Royal Society of Chemistry The proton uptake process in double perovskite triple ionic-electronic conducting oxides for protonic ceramic cells Article 10.1039/d2ta03522g 1 Journal of Materials Chemistry A, v.10, no.30, pp.16127 - 16136 Journal of Materials Chemistry A 10 30 16127 16136 N scie scopus 000826638000001 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article FUEL-CELLS CATHODE MATERIALS POWER-DENSITY HYDRATION OXYGEN GENERATION STABILITY TRANSPORT