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Enhanced Electrochemical Performance of Cu-Doped La₂NiO_4+δ Cathode for Solid Oxide Fuel Cells

H. Chen, H. Chen, X. Li, X. Du, H. Xie, L. Zhao, Y. Ling, Y. Ling

Journal of Ceramic Science and Technology, Vol. 9, No. 2 (2018), pp. 155-162

DOI: 10.4416/JCST2017-0090

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Abstract

To illustrate the effect of Cu-doping in Ruddlesden-Popper-type La2NiO4+δ oxides, the crystal structure, interstitial oxygen formation, electrical conductivity, catalytic activity and chromium tolerance of La2NiO4+δ(LNO)and La2Ni0.9Cu0.1O4+δ(LNCO) are analyzed. XRD Rietveld and HT-TEM results confirm that both can be identified as Ruddlesden-Popper-type structures with tetragonal symmetry. Compared with non-doped LNO, LNCO has less interstitial oxygen, and its electrical conductivity decreases owing to the reduction of the carrier concentration. The effects on electrode performance are analyzed using symmetric cells, and interface polarization resistance at 800 °C is reduced from 2.20 Ωcm2 to 0.54 Ωcm2 after Cu-doping. Experimental results together with the excellent chromium tolerance confirmed by HT-XRD results demonstrate that Cu-doped LNO can work as a promising chromium-tolerant cathode.

Keywords

Ruddlesden-Popper-type oxide, interstitial oxygen, interface polarization resistance, chromium-tolerant cathode

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