Transport-number determination of a protonic ceramic electrolyte membrane via electrode-polarisation correction with the Gorelov method

JOURNAL OF POWER SOURCES

卷:245

Article

Perez-Coll, Domingo¹  Heras-Juaristi, Gemma¹  Fagg, Duncan P.²  Mather, Glenn C.¹ 

[1] CSIC, Inst Ceram & Vidrio, E-28049 Madrid, Spain

[2] Univ Aveiro, Dept Mech Engn, Ctr Mech Technol & Automat, Nanotechnol Res Div, P-3810193 Aveiro, Portugal

关键词: Strontium zirconate;    Proton conduction;    Solid oxide electrolyser cell;    Modified electromotive force technique;    Transference number;    Protonic ceramic fuel cell;   

DOI  :  10.1016/j.jpowsour.2013.06.155

来源: Elsevier

【 摘 要 】

Analysis of transport numbers is critical for assessing the suitability of an ion-conducting material for a given electrochemical application and the conditions for its employment. In this work, the proton, oxide-ion and electron transport numbers of the candidate protonic ceramic electrolyser and fuel cell material SrZr0.9Y0.1O3-delta (with the addition of 4 mol% ZnO as sintering aid) are measured in wet and dry oxidising atmospheres in the temperature range 700-850 degrees C. The determination of proton transport numbers is analysed in detail, encompassing the suitability of equivalent circuits in different conditions and the inclusion of an external parallel resistance for the correction of electrode-polarisation effects (Gorelov method). It is confirmed that transport numbers are highly inaccurate if no polarisation correction is applied. In dry oxidising conditions oxide-ion transport numbers, to, lie in the range 0.63-0.78. The conductivity in wet oxidising conditions is dominated by protons and an electronic component, with the proton transport number increasing from 0.79 to 0.88 with increasing pH(2)O in the range 1.1 x 10(-3) <= pH(2)O <= 1.27 x 10(-2) atm at 700 degrees C. (C) 2013 Elsevier B.V. All rights reserved.

【 授权许可】

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