The Power of Interfaces: Fundamentals for Solid State Devices
The joint SOIFIT-Harverstore meeting was held at the historic Royal Society in London on10-11th March 2020.
The research interests of Skinner research group centre on the properties and structures of ion-conducting oxides, with emphasis on the identification and characterisation of new materials using in- situ high-temperature techniques such as x-ray and neutron powder diffraction techniques, secondary ion mass spectrometry and low energy ion scattering. This work has potential applications in the development of solid oxide fuel cell, electrolysis and permeation membranes and more have been identified as having application in the field of novel solid-state gas sensors.
Our Latest Publications
Here, we investigated the high temperature structural properties of the LaNb1–xWxO4+d (x = 0.04–0.16) family, which is a structural analogue of hyper-stoichiometric CeNbO4+d.
High oxide-ion conductivity through the interstitial oxygen site in Ba7Nb4MoO20-based hexagonal perovskite related oxides
We report oxide-ion conductors based on a hexagonal perovskite-related oxide Ba7Nb4MoO20. Ba7Nb3.9Mo1.1O20.05 shows a wide stability range and predominantly oxide-ion conduction in an oxygen partial pressure range from 2 × 10−26 to 1 atm at 600 °C. Surprisingly, its bulk conductivity, 5.8 × 10−4 S cm−1, is remarkably high at 310 °C, and higher than Bi2O3- and zirconia-based materials.
Oxygen diffusion behaviour of A-site deficient (La0.8Sr0.2)0.95Cr0.5Fe0.5O3−δ perovskites in humid conditions
We have designed and carried out fundamental research into the effect of humidity on the oxygen surface exchange and diffusion kinetics of a commercialized (La0.8Sr0.2)0.95Cr0.5Fe0.5O3−δ (LSCrF8255) perovskite material under elevated OTM and SOFC operating conditions. We show that Sr segregation is one of the factors suppressing water surface exchange. Another limiting factor was found through in situ residual gas analysis (RGA), which showed the dominance of homo-exchange between the humid vapour and gaseous oxygen molecules at high temperatures.
Surface Restructuring of Thin-Film Electrodes Based on Thermal History and Its Significance for the Catalytic Activity and Stability at the Gas/Solid and Solid/Solid Interfaces
We studied La0.6Sr0.4CoO3 thin films with different processing and thermal histories. We show that the chemical activity and stability of the films are significantly affected by the thermally induced chemical restructuring at the air/electrode and electrode/electrolyte interfaces.