Stephen is the Ceres Power/RAEng Research Chair in Electrochemical Devices for a Zero Carbon Economy. His research interests are in materials for new energy technologies and is primarily concerned with the chemical and physical properties of solid oxide cell electrolytes and electrodes and encompasses the electrical and structural characteristics of materials. He has extensive experience of the use of neutron and synchrotron facilities to undertake in-situ high temperature characterisation of new materials and in relating the structural characteristics of materials to their electrochemical properties. His group are engaged in the development of high temperature electrolysers based on both oxide ion and proton conducting oxides, permeation membranes, sensor coatings and solid state electrochemical sensors.