This issue of the Journal contains 11 papers presented at the European Science Foundation Exploratory Workshop on Proton Conducting Materials for Next-generation Solid Oxide Fuel Cells held at Genova, Italy, 22–24 October 2007.

I am grateful to Antonio Barbucci, Paolo Piccardo and Massimo Viviani for their valued assistance with the procurement and processing of these papers.

Exeter, December 2008