Development of test protocols for solid oxide electrolysis cells operated under accelerated degradation conditions

JOURNAL OF POWER SOURCES

卷:497

Article

Konigshofer, Benjamin¹  Pongratz, Gernot¹  Nusev, Gjorgji^2,3  Boskoski, Pavle²  Hober, Michael¹  Juricic, Dani²  Kusnezoff, Mihails⁴  Trofimenko, Nikolai⁴  Schroettner, Hartmuth⁵  Hochenauer, Christoph¹  Subotic, Vanja¹ 

[1] Graz Univ Technol, Inst Thermal Engn, Inffeldgasse 25-B, A-8010 Graz, Austria

[2] Jozef Stefan Inst, Jamova Cesta 39, Ljubljana 1000, Slovenia

[3] Jozef Stefan Int Postgrad Sch, Jamova Cesta 39, Ljubljana 1000, Slovenia

[4] Fraunhofer Inst Ceram Technol & Syst IKTS, Winterbergstr 28, D-01277 Dresden, Germany

[5] Austrian Ctr Electron Microscopy & Nanoanal, Steyrergasse 17, A-8010 Graz, Austria

关键词: Solid oxide electrolysis cell (SOEC);    Single cell;    Electrochemical analysis;    Accelerated stress test (AST);    Distribution of relaxation times (DRT);   

DOI  :  10.1016/j.jpowsour.2021.229875

来源: Elsevier

【 摘 要 】

In order to be a real competitor to other industrial-scale hydrogen production technologies, solid oxide electrolysis cells (SOEC) must present essential features such as high hydrogen production rates, load flexibility and high system efficiency. However, operating conditions necessary to achieve these objectives can induce undesired performance deterioration and microstructural degradation negatively influencing the long-term stability of SOECs. This work provides the results of experimental investigations on the performance of SOECs operated under different operating conditions. In order to induce and accelerate specific degradation phenomena high steam partial pressures, fast load changes, high voltages, high steam conversion rates and alternating mode were applied. Different kinds and degrees of impact on performance and microstructure were observed and analyzed in detail. Correlations between performance changes and their underlying processes were investigated and useful connections between them were discovered. The major findings are summarized in the form of a suggestion for accelerated stress test (AST) protocols for SOECs. The developed ASTs enable deeper understanding of several degradation phenomena induced by different operating conditions and present methods for identification thereof. Further, the ASTs were estimated to have potential to predict performance changes over long-term operating periods.

【 授权许可】

Free