Phosphorus-doped protonic conductors based on BaLa_nIn_nO_3n+1 (n = 1, 2): applying oxyanion doping strategy to the layered perovskite structure

Abstract

The creation of highly efficient and eco-friendly energy sources such as hydrogen energy systems is one of main vectors for the sustainable development of human society. Proton-conducting ceramic materials can be applied as one of the main components of such hydrogen- fueled electrochemical devices, including protonic ceramic fuel cells. The oxyanion doping strategy is a promising approach for improving transport properties of proton-conducting complex oxides. In this paper, this strategy was applied to proton-conducting layered perovskites for the first time. The phosphorus-doped protonic conductors based on BaLanInnO3n+1 (n = 1, 2) were obtained, and their electrical conductivity was thoroughly investigated. It was found that the phosphorous doping leads to an increase in the electrical conductivity values by ~0.7 orders of magnitude.

Local structure and ionic transport in acceptor-doped layered perovskite BaLa2In2O7

“…Several years ago, the possibility of ionic transport was revealed for the layered perovskites with the Ruddlesden-Popper structure [26]. Materials based on BaNdInO4 [27][28][29][30][31][32], SrLaInO4 [33][34][35][36][37], BaLaScO4 [38], BaLaInO4 [39][40][41][42][43][44], BaLa2In2O7 [45,46] and BaNd2In2O7 [47,48] were investigated as oxygen-ionic and protonic conductors. The effect of the doping on the local structure and its relationship with transport properties was shown for layered perovskites based on BaLaInO4 [49,50].…”