I-8 – Ceramic Proton and Hydride Ion Conductors



Organizers: Truls Norby (University of Oslo, Norway); Tor Svendsen Bjørheim (University of Oslo, Norway); Hiroshige Matsumoto (Kyushu University, Japan); Ryan O’Hayre (Colorado School of Mines, USA)

Protonic species are present in and affect the functional properties of a vast number of functional materials, and in many cases give rise to significant or predominant solid state protonic conduction. Solid state ceramics proton conductors are the basic functional components for the development of sustainable energy technologies, such as high temperature fuel cells, electrolyzers, and hydrogen separation membranes. Furthermore, mixed proton and electron conducting oxides are important for the development of electrodes for such applications, and many aspects relating to their defect chemistry and transport properties remain unresolved. While protonic charge carriers dominate oxidic materials, a range of materials have been shown to conduct hydride ions, including metal hydrides, oxyhydrides and nitrides, which potentially may pave the way for novel applications. Understanding the effect of defect interactions is increasingly important within the field. Point defects may lead to significant defect trapping or clustering, while extended defects such as grain boundaries, dislocations and hetero interfaces may result in the formation of space-charge zones, ultimately lowering the achievable proton conductivity.

The symposium focuses on characterization, modelling and understanding the defect chemical and charge transport properties of hydrogen in both its positive and negative charge states in oxidic and non-oxidic ceramic materials, and aims to bring together scientists from diverse disciplines. Of particular focus are novel proton conductors, protons in mixed conductors and metallic oxides, hydrogen transport in hydrides, oxyhydrides, nitrides, and non-oxidic ceramics, defect interactions and percolation effects, protonic transport in confined materials, space-charge effects at surfaces and hetero-interfaces, and electrodics.


Abstracts are solicited in, but not necessarily limited to, the following areas:

In this Symposium are also welcome those contributions which cover the topics beyond the above-described areas. This is done to provide the audience with a comprehensive description of Solid State Ionics. If your contribution is difficult to host within the above areas, please do not hesitate to contact directly the Conference Chairmen at ssi21@dii.unipd.it for advice.

List of Invited Speakers