Proton conductor

Acid solutions exhibit proton-conductivity, while pure proton conductors are usually dry solids.

Typically, the pores in practical materials are small such that protons dominate direct current and transport of cations or bulk solvent is prevented.

[3] Solid-phase proton conduction was first suggested by Alfred Rene Jean Paul Ubbelohde and S. E. Rogers.

When in the form of thin membranes, proton conductors are an essential part of small, inexpensive fuel cells.

[7][8] High proton conductivity has been reported among alkaline-earth cerates and zirconate based perovskite materials such as acceptor doped SrCeO3, BaCeO3 and BaZrO3.