Proton Electrokinetics: Electrokinetic Proton Transport in Triple (H⁺/O²⁻/e⁻) Conducting Oxides as a Key Descriptor for Highly Efficient Protonic Ceramic Fuel Cells (Adv. Sci. 11/2021)

In article number 2004099, Sihyuk Choi, Guntae Kim, and co-workers employe the isotope exchange diffusion profile (IEDP) method via time-of-flight secondary ion mass spectrometry (ToF-SIMS) to directly trace the proton kinetics on layered perovskite-type triple conducting oxides (TCOs). This work offers an innovative way to quantify the proton kinetic properties (D*H and k*H) of TCOs being a crucial indicator for characterizing the electrochemical behaviour of proton.