Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5149957 | Journal of Power Sources | 2016 | 7 Pages |
Abstract
An Ag-infiltrated nanocomposite LSCF (La0.6Sr0.4Co0.2Fe0.8O3âδ)-YSZ (yttria stabilized zirconia) oxygen electrode is prepared for co-electrolysis of steam and CO2. Scanning electron microscopy (SEM) associated with energy dispersive X-ray spectroscopy (EDS) is employed to verify that nano-Ag particles are formed into the porous LSCF-YSZ electrode. Polarization curves and electrochemical impedance spectra (EIS) of the cell as well as long-term durability are investigated. In comparison with the Ag-free cell, the Ag-loaded cell exhibited improved performance and long-term stability when 45% H2O, 45% CO2, and 10% H2 is introduced as inlet gas. With infiltration of metal Ag, the ohmic resistance of the cell decreases from 0.14 Ω cm2 to 0.11 Ω cm2, and the polarization resistance from 0.30 Ω cm2 to 0.17 Ω cm2 at 800 °C. No significant deterioration of the Ag-infiltrated cell is observed when operating for 200 h at 1.3 V and 750 °C. With respect to varied H2O/CO2 ratio (1:2, 1:1, and 2:1) in feed gas, higher H2O percent content is resulted into higher cell performance, despite the fact that varied inlet gas composition did not dramatically influence the cell performance.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Hui Fan, Minfang Han,