In situ assembled La<inf>0.8</inf>Sr<inf>0.2</inf>MnO<inf>3</inf> cathodes on a Y<inf>2</inf>O<inf>3</inf>-ZrO<inf>2</inf> electrolyte of solid oxide fuel cells-interface and electrochemical activity
MetadataShow full item record
© 2016 The Royal Society of Chemistry.Formation of an intimate electrode/electrolyte interface is essential for solid oxide fuel cells (SOFCs). In this study, a comparative investigation has been undertaken to study the interface formation between a La0.8Sr0.2MnO3 (LSM) cathode and Y2O3-ZrO2 (YSZ) electrolyte by high temperature sintering and by cathodic polarization using EIS, SEM, AFM and HAADF-STEM techniques. The electrode/electrolyte interface formed by the conventional pre-sintering process is characterized by the formation of distinctive convex contact rings on the YSZ surface and such convex contact rings are due to the cation interdiffusion such as manganese species between LSM and YSZ. Similar to the thermally induced interface, the electrode/electrolyte interface can also be formed by electrochemical polarization for the in situ assembled LSM cathode on YSZ as well as on Gd2O3-CeO2 (GDC) electrolytes without pre-sintering at high temperatures. The polarization induced interface has smaller contact marks due to the much finer grain size of the as-prepared LSM electrodes. Detailed electrochemical impedance studies indicate that both thermally and polarization induced LSM/YSZ interfaces show comparable electrocatalytic activity and behaviour for the oxygen reduction reaction with similar activation energies. The present study clearly demonstrates the formation of effective electrode/electrolyte interfaces in SOFCs under the influence of cathodic polarization without high temperature sintering steps.
Showing items related by title, author, creator and subject.
Thermally and electrochemically induced electrode/electrolyte interfaces in solid oxide fuel cells: An AFM and EIS StudyJiang, San Ping (2015)In high temperature solid oxide fuel cells (SOFCs), electrode/electrolyte interfaces play a critical role in the electrocatalytic activity and durability of the cells. In this study, thermally and electrochemically induced ...
Nb and Pd co-doped La<inf>0.57</inf>Sr<inf>0.38</inf>Co<inf>0.19</inf>Fe<inf>0.665</inf>Nb<inf>0.095</inf>Pd<inf>0.05</inf>O<inf>3-d</inf>as a stable, high performance electrode for barrier-layer-free Y<inf>2</inf>O<inf>3</inf>-ZrO<inf>2</inf>electrolyte of solid oxide fuel cellsChen, K.; He, S.; Li, N.; Cheng, Y.; Ai, N.; Chen, M.; Rickard, William; Zhang, T.; Jiang, S. (2018)© 2017 Elsevier B.V. La 0.6 Sr 0.2 Co 0.2 Fe 0.8 O 3-d (LSCF) is the most intensively investigated high performance cathode for intermediate temperature solid oxide fuel cells (IT-SOFCs), but strontium segregation and ...
Highly Stable Sr-Free Cobaltite-Based Perovskite Cathodes Directly Assembled on a Barrier-Layer-Free Y2O3-ZrO2 Electrolyte of Solid Oxide Fuel CellsAi, Na; Li, N.; Rickard, William; Cheng, Yi; Chen, Kongfa; Jiang, San Ping (2017)Direct assembly is a newly developed technique in which a cobaltite-based perovskite (CBP) cathode can be directly applied to a barrier-layer-free Y2O3-ZrO2 (YSZ) electrolyte with no high-temperature pre-sintering steps. ...