Optical absorption and XPS studies of (Ba1-xSrx)(Ce0.75Zr0.10Y0.15)O3-δ electrolytes for protonic ceramic fuel cells
- Optical absorption and XPS studies of (Ba1-xSrx)(Ce0.75Zr0.10Y0.15)O3-δ electrolytes for protonic ceramic fuel cells
- 이해원; 이종호; 손지원; 윤경중; 홍종섭; Shivendra Kumar Jaiswal
- SOFC; PCFC; Electrolyte; optical absrption; XPS
- Issue Date
- Ceramics international
- VOL 42, NO 8, 10366-10372
- Perovskite-type materials containing metal and cerium cations have been used as catalysts, membranes, electrodes in fuel cells, and hydrogen pumps. The effect of strontium doping on the perovskite-type structure has been evaluated and effectively maintains the cubic structure of (Ba1− xSrx)(Ce0.75Zr0.10Y0.15)O3− δ. X-ray photoelectron spectroscopy (XPS) was performed on the oxidation states of barium, strontium, cerium, zirconium, yttrium and oxygen. With strontium doping, the oxidation state of cerium ions in 4+ increases and results in the decrease in oxygen vacancy concentration. These are attributed to the strong binding energy of (A/B)– O bond which in turn, enhances the structural stability of electrolyte system. The free volume (Vf) is maximum for x=0.2 (Vf=33.1Å 3) and then decreases with further strontium insertion. The optical absorption peaks are attributed to charge transfer transitions and energy band gap (increases from ~4.13 to ~4.35eV). However, the increase of band gap is only ~5% with partial replacement of barium by strontium. These characteristics are useful to make (Ba1− δ a promising candidate for futuristic and reliable fuel cell technology.
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