A Stable, Easily Sintered Proton- Conducting Oxide Electrolyte for Moderate-Temperature Fuel Cells and Electrolyzers

For proton‐conducting oxides to be used in fuel cell and related technologies, sintering to form dense ceramics at low temperatures and avoiding carbonation of BaCeO3‐based oxides is required. A new strategy that allows densification at much reduced temperatures (see figure) and provides high total conductivity, with the additional benefit of stabilization against degradation, is reported.