| abstract |
A proton conductive material that can operate over a low temperature range to a middle temperature range, being produced easily at low cost; a process for producing the same; and, having the proton conductive material mounted thereon, a hydrogen concentration cell, hydrogen sensor and fuel cell. There is provided a proton conductive material characterized by containing calcium, sulfur and hydrogen elements and exhibiting a proton conductivity of 10-6 S/cm or higher at room temperature. The proton conductive material can contain, in terms of oxide, 10 to 45 wt.% of CaO, 15 to 60 wt.% of SO3 and 5 to 55 wt.% of H2O. Further, 0.1 to 50 wt.% of P2O5 can be contained. |