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doi:10.1149/1.2216562. The state of the art for O2 conducting yttria stabilized zirconia(YSZ) based SORFC using NiYSZ as the hydrogen electrode and LSM (or LSMYSZ) as the oxygen electrode has been actively studied. Dnitz and Erdle reported on the operation of YSZ electrolyte cells with current densities of 0.3 A cm2 and 100% Faraday efficiency at only 1.07 V. The recent study by researchers from Sweden shows that ceria-based composite electrolytes, where both proton and oxide ion conductions exist, produce high current output for fuel cell operation and high hydrogen output for electrolysis operation. Zirconia doped with scandia and ceria (10Sc1CeSZ) is also investigated as potential electrolyte in SORFC for hydrogen production at intermediate temperatures(500-750C).It is reported that 10Sc1CeSZ shows good behavior and produces high current densities, with suitable electrodes.. Commonly used/tested electrodes materials are nickel/zirconia cermet (Ni/YSZ) and lanthanum-substituted strontium titanate/ceria composite for SORFC cathode, and lanthanum strontium manganite (LSM) for SORFC anode. Hence, developing high performance electrodes are essential for high efficiency SORFC. 192: 501. Nfcrc.uci.edu. ^ "Electrolyzer and Reversible Fuel Cell". "Performance and Aging ofMicrotubular YSZ-based Solid Oxide Regenerative Fuel Cells".
The following reactions describe the chemical process in the hydrogen generation mode:. Kilner (1 July 2009). Impedance spectra are realized applying an ac current of 12A RMS (root-mean-square) in the frequency range from 30kHz to 101 Hz. ^ "Microsoft Word - E-14264 Layout.doc" (PDF). "Development of oxygen electrodes for reversible solid oxide fuel cells with scandia stabilized zirconia electrolytes".
11: 116. 8 (3): 495498. doi:10.1016/j.ijhydene.2008.07.120. By definition, the process of any fuel cell could be reversed. However, a given device is usually optimized for operating in one mode and may not be built in such a way that it can be operated backwards. References.
Studies show that Ni/YSZ electrode was less active in reverse fuel cell operation than in fuel cell operation,and this can be attributed to a diffusion-limited process in the electrolysis direction, or its susceptibility to aging in a high-steam environment, primarily due to coarsening of nickel particles. Therefore, alternative materials such as the titanate/ceria composite (La0.35Sr0.65TiO3Ce0.5La0.5O2)or (La0.75Sr0.25)0.95Mn0.5Cr0.5O3 (LSCM) have been proposed electrolysis cathodes.Both LSF and LSM/YSZ are reported as good anode candidates for electrolysis mode. Furthermore,higher operation temperature and higher absolute humidity ratio(AH) can result in lower ASR.. ^ Hauch, A.; S. Sustainable development portal . type Status report. When the fuel cell is operated in regenerative mode, the anode for the electricity production mode(fuel cell mode) becomes the cathode in the hydrogen generation mode(reverse fuel cell mode), and vice versa. ^ "6th Framework Programme, Research STREP program GenHyPEM n 019802 and Global Energy". Contents 1 Process description 2 Solid oxide regenerative fuel cell (SORFC) 3 See also 4 References 5 External links . International Journal of Hydrogen Energy.