A high performing perovskite cathode with in situ exsolved Co nanoparticles for H2O and CO2 solid oxide electrolysis cell

La0.5Ba0.5Mn1-xCoxO3-δ (x < 0.4) with a perovskite structure is studied as a cathode material for solid oxide electrolysis cells. The exsolution of metallic Co from the perovskite in a reducing atmosphere is in situ investigated. Co improves the electrical conductivity of La0.5Ba0.5MnO3-δ in a reducing atmosphere, and facilitates the oxygen exchange reaction on the cathode surface. The cathode with in situ exsolved Co nanoparticles shows a high activity for both H2O and CO2 electrolysis. At 1.3 V, a single cell supported by a La0.8Sr0.2Ga0.8Mg0.2O3-δ electrolyte layer achieves H2O electrolysis current densities of 0.46 and 1.01 A cm-2 at 700 and 800 °C, respectively. A high CO2 electrolysis current density of 0.88 A cm−2 is also obtained with the same cell at 1.2 V and 850 °C with a Faradaic efficiency exceeding 90 %. The cathode exhibits a high stability for H2O and CO2 electrolysis. The co-electrolysis of H2O and CO2 with the cathode is also studied.

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Cathode, Co doping, LaBaMnO, Solid oxide electrolysis cell

DOI

10.1016/j.cattod.2020.06.082

Citation

Gan, J, Hou, N, Yao, T, Fan, L, Gan, T, Huang, Z, Zhao, Y & Li, Y 2021, ' A high performing perovskite cathode with in situ exsolved Co nanoparticles for H 2 O and CO 2 solid oxide electrolysis cell ', Catalysis Today, vol. 364, pp. 89-96 . https://doi.org/10.1016/j.cattod.2020.06.082

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https://urn.fi/URN:NBN:fi:aalto-202104206228

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[article-cris] Kemian tekniikan korkeakoulu / CHEM

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A high performing perovskite cathode with in situ exsolved Co nanoparticles for H2O and CO2 solid oxide electrolysis cell

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