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Highly active and stable Er0.4Bi1.6O3 decorated La0.76Sr0.19MnO3+δ nanostructured oxygen electrodes of reversible solid oxide cells

Abstract

Bismuth based oxide has excellent ionic conductivity and fast oxygen surface kinetics and shows promising potential as highly active electrode materials in solid oxide cells (SOCs) such as solid oxide fuel cells (SOFCs) and solid oxide electrolysis cells (SOECs). However, the low melting temperature and high activity of bismuth based oxides severely limit their wide applications in SOCs. Herein, we successfully synthesized 40wt% Er0.4Bi1.6O3 decorated La0.76Sr0.19MnO3+ (ESB-LSM) electrode via a new gelation method and directly assembled on Ni-yttria-stabilized zirconia (Ni-YSZ) cermet supported YSZ electrolyte cell without the conventional high temperature pre-sintering step. ESB decoration substantially enhances the electrocatalytic activity of LSM electrode for the oxygen reduction/evolution reactions (ORR/OER). A YSZ electrolyte cell with directly assembled ESB-LSM electrode exhibits a peak power density of 1.62 W cm-2 at 750 oC, significantly higher than 0.48 and 0.88 W cm-2 obtained on cells with a directly assembled pristine LSM and LSM-YSZ composite electrodes, respectively. Most importantly the cells with the directly assembled ESB-LSM oxygen electrodes show excellent stability under SOFC, SOEC and reversible SOC operation modes for over 200 h. The present study demonstrates a significant advancement in the development of bismuth based oxide decorated high performance and stable oxygen electrodes of reversible SOCs.

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Publication details

The article was received on 05 Apr 2017, accepted on 17 May 2017 and first published on 17 May 2017


Article type: Paper
DOI: 10.1039/C7TA02950K
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Highly active and stable Er0.4Bi1.6O3 decorated La0.76Sr0.19MnO3+δ nanostructured oxygen electrodes of reversible solid oxide cells

    N. Ai, N. Li, S. He, Y. Cheng, M. Saunders, K. Chen, T. Zhang and S. P. Jiang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA02950K

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