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| Naji, M. |
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Heise, Martin
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Publications (4/4 displayed)
- 2014A metallic room-temperature oxide ion conductorcitations
- 2014Full access to nanoscale bismuth - Palladium intermetallics by low-temperature synthesescitations
- 2012Semimetallic paramagnetic nano-Bi2Ir and superconducting ferromagnetic nano-Bi3Ni by microwave-assisted synthesis and room temperature pseudomorphosiscitations
- 2012Synthesis of BiRh nanoplates with superior catalytic performance in the semihydrogenation of acetylenecitations
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article
A metallic room-temperature oxide ion conductor
Abstract
<p>Nanoparticles of Bi<sub>3</sub>Ir, obtained from a microwave-assisted polyol process, activate molecular oxygen from air at room temperature and reversibly intercalate it as oxide ions. The closely related structures of Bi<sub>3</sub>Ir and Bi<sub>3</sub>IrO<sub>x</sub> (x≤2) were investigated by X-ray diffraction, electron microscopy, and quantum-chemical modeling. In the topochemically formed metallic suboxide, the intermetallic building units are fully preserved. Time- and temperature-dependent monitoring of the oxygen uptake in an oxygen-filled chamber shows that the activation energy for oxide diffusion (84meV) is one order of magnitude smaller than that in any known material. Bi<sub>3</sub>IrO<sub>x</sub> is the first metallic oxide ion conductor and also the first that operates at room temperature.</p>