Novel mixed H+/e−/O2− conducting cathode material PrBa0.9K0.1Fe1.9Zn0.1O5+δ for proton-conducting solid oxide fuel cells

This work introduces a significant Co-free cathode material for proton-conducting solid oxide fuel cells (H-SOFCs) and offers a deep understanding of the effect of K-doping on the ability of absorption and transportation of oxygen ions and protons.