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Understanding the cathodic polarisation behaviour of the misfit [Ca2CoO3−δ]q[CoO2] (C349) as oxygen electrode for IT-SOFC

2018; Elsevier BV; Volume: 285; Linguagem: Inglês

10.1016/j.electacta.2018.08.018

1873-3859

Jakeline R.D. Santos, Francisco J.A. Loureiro, João P.F. Grilo, Vinícius D. Silva, Thiago A. Simões, Duncan P. Fagg, Daniel A. Macedo,

Fuel Cells and Related Materials

Pure phase misfit Ca-cobaltite powder, [Ca2CoO3−δ]q[CoO2] (C349), was successfully synthesised by the proteic sol-gel synthesis route and characterised by X-ray diffraction. The electrochemical performance of the C349 cathode screen-printed onto Ce0.9Gd0.1O1.95 (GDC) solid electrolyte was studied employing electrochemical impedance spectroscopy in 3-electrode cell configuration. Cathodic polarisation was evaluated in potentiostatic mode in the temperature range 550–700 °C. The C349 cathode prepared by proteic sol-gel synthesis route demonstrates lower polarisation resistances than similar misfit Ca-cobaltite compositions reported in the literature, produced by different synthetic approaches. A highly competitive performance of the formed C349 cathode is also highlighted upon comparison to typical SOFC cathodes under applied DC bias.