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xhyu

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[资源] Advanced supporting anodes for Sollid(要变金虫了,大家多支持!)

Advanced supporting anodes for Solid Oxide
Fuel Cells
Three different ceramic materials for nickel-cermet anodes have been used to prepare and characterise
supporting anodes for Solid Oxide Fuel Cells. Symmetrical cells with nominally identical supporting
anodes were prepared and electrochemically tested. The three different cermets were nickel/yttria
stabilised zirconia (YSZ), nickel/gadolinium doped ceria (CGO) and nickel/titania and yttria doped
zirconia (YZT). The Ni/YSZ anodes contained different ratios of fine and coarse YSZ. Their polarisation
resistances varied from 2.0 – 7.4 Ωcm2; the resistance increased with an increasing amount of coarse
YSZ. The anodes suffered a lot from degradation, which makes a good analysis and comparison of the
measurement data hard. Therefore it is hard to ascribe the impedances to certain electrochemical
processes. The lowest polarisation resistance was found for the Ni/CGO anodes, with a polarisation
resistance of 1.1 Ωcm2. In the first place, the fine microstructure plays an important role for the relatively
low impedance. Secondly, the stability of this anode in contrast to the other materials is thought to be
due to the high purity powder that was used. From the electrochemical characterisation, it is believed
that an adsorption process and oxidation/reduction of the ceria cause the main impedances. The last
material, Ni/YZT, performed a bit worse than the Ni/YSZ anodes. The impedances of these Ni/YZT
anodes were fitted with a Finite Length Fractal Gerischer, resulting in consistent fit data. This Gerischer
describes a diffusion process coupled to a side reaction, which limits the amount of diffusing species. A
proper electrochemical explanation has yet to be formulated, but the mixed ionic and electronic
conductivity of YZT is almost certainly involved. In any case, the total polarisation impedances for this
material amounted 5.9 – 10 Ωcm2. Like the Ni/YSZ anodes, the impedance decreased with an
increasing amount of fine YZT.
page 74
It is good for material majors!
http://rs175l3.rapidshare.com/cg ... =352603312628556130

[ Last edited by xhyu on 2007-10-23 at 17:41 ]

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