High-Temperature Proton Conductors Ceramic Oxides

High-Temperature Proton Conductors Ceramic Oxides 

Since the pioneering studies conducted by Iwahara s group ]271], hundreds of 

In noncubic perovskites, whilst some of the 0—0 distances become shorter, any continuous path must also include longer 0-0 distances. The cubic perovskites should, therefore, be better proton conductors, and a shortening of the 0—0 distances should be dynamic, due to thermal motion. The H — M repulsion contributes to the activation energy of the proton transport. Indeed, A + + O3-based materials are much poorer proton conductors than A + M + 03-based phases. Consequently, the A + O3 perovskites appear to show promise ]15,21], although 

Due to low dopant concentrations and high temperatures, the reactions of the doped perovskites with gases may be adequately described by the point defect model and quasi-chemical equilibria  

The borderlines between low and high partial pressures may depend on the 

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High-Temperature Proton Conductors Ceramic Oxides... 

Dr. Hui has worked on various projects, including chemical sensors, solid oxide fuel cells, magnetic materials, gas separation membranes, nanostruc-tured materials, thin film fabrication, and protective coatings for metals. He has more than 80 research publications, one worldwide patent, and one U.S. patent (pending). He is currently leading and involved in several projects for the development of metal-supported solid oxide fuel cells (SOFCs), ceramic nanomaterials as catalyst supports for high-temperature PEM fuel cells, protective ceramic coatings on metallic substrates, ceramic electrode materials for batteries, and ceramic proton conductors. Dr. Hui is also an active member of the Electrochemical Society and the American Ceramic Society. 

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