Tailoring the electrode-electrolyte interface of Solid Oxide Fuel Cells (SOFC) by laser micro-patterning to improve their electrochemical performance

JOURNAL OF POWER SOURCES

卷:360

Article

Cebollero, J. A.¹  Lahoz, R.¹  Laguna-Bercero, M. A.¹  Larrea, A.¹ 

[1] Univ Zaragoza, CSIC, Inst Ciencia Mat Aragon, C Maria de Luna 3, E-50018 Zaragoza, Spain

关键词: SOFC;    Laser machining;    Corrugated surface;    Electrode polarisation;    Cathode activation;    Electrode/electrolyte interface;   

DOI  :  10.1016/j.jpowsour.2017.05.106

来源: Elsevier

【 摘 要 】

Cathode activation polarisation is one of the main contributions to the losses of a Solid Oxide Fuel Cell. To reduce this loss we use a pulsed laser to modify the surface of yttria stabilized zirconia (YSZ) electrolytes to make a corrugated micro-patterning in the mesoscale. The beam of the laser source, 5 ns pulse width and emitting at lambda = 532 nm (green region), is computer-controlled to engrave the selected micro-pattern on the electrolyte surface. Several laser scanning procedures and geometries have been tested. Finally, we engrave a square array with 28 pm of lattice parameter and 7 pm in depth on YSZ plates. With these plates we prepare LSM-YSZ/YSZ/LSM-YSZ symmetrical cells (LSM: La1-xSrxMnO3) and determine their activation polarisation by Electrochemical Impedance Spectroscopy (EIS). To get good electrode electrolyte contact after sintering it is necessary to use pressure-assisted sintering with low loads (about 5 kPa), which do not modify the electrode microstructure. The decrease in polarisation with respect to an unprocessed cell is about 30%. EIS analysis confirms that the reason for this decrease is an improvement in the activation processes at the electrode-electrolyte interface. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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