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Micro-solid oxide fuel cell (μSOFC) structures with annular Pt electrodes have been fabricated by means of silicon micromachining. The annular cathodes contained a defined triple phase boundary (TPB) length, which allowed the derivation of the ionic current per length of TPB as 1.24mAm −1 , measured at 450°C at maximal power. Considering literature values for oxygen diffusion activation on...