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MIEC chemical stability

To develop an alternative MIEC cathode not only the ex situ properties, e.g., cr, TEC, /), and k, but also the electrocatalytic activity, structural and chemical stability, and Cr-tolerance must be considered. Beyond testing in small SOFC button cells, the viability of new cathode materials must ultimately be proven in large-scale stack cells under practical current and temperature gradients. The issues involved in the development of cathode materials for large-scale stacks are significantly more complex than those in the small button cells briefly reviewed in this chapter. However, this does provide serious challenges as well as opportunities for materials scientists and engineers in the development of commercially viable ITSOFCs. [Pg.171]

Several groups have tried to extend the chemical stability of MIEC membrane materials against CO2 by using different approaches, some of which are discussed in the following sections. [Pg.97]

The acceptor-doped perovskites (general formula of ABOs-a) have shown much promise as MIECs. Much attention has been focused on these versatile metal oxides as they exhibit catalytic activity [24] and therefore their use in some applications can avoid the need for catalytic modification of the membrane surface. This activity has meant that MIECs can be used as electrode materials in solid-oxide fuel cell systems for the reduction of oxygen simultaneously, this inherent catalytic activity means that problems with chemical stability can arise. [Pg.76]

In addition to the P[3MT-MG8] series of MIEC block copolymers prepared in our laboratories, a third series of block copolymers, poly(3-methylthiophene-co-3-octylthiophene)-block-poly[o>-methoxyocta(oxyethylene)methacrylate], abbreviated P[3MT,30T-MG8], have been synthesized. The reason we selected random copolymers of 3MT and 30T for the electronic conductive block is to combine the solubility and fusibility of SOT with the chemical and electrochemical stability of... [Pg.352]

The two main problems concern the reactivity between the MIEC and the solid electrolyte and the appearance of electronic conductivity in the sohd electrolyte inducing polarization phenomena. The appropriate choice of the solid electrolyte can noticeably reduce the chemical reactivity as an example, ceiia-based electrolyte or apatite is less reactive than stabilized zirconia [Mauvy et al., 2009]. Double-electrolyte cells have been proposed to extend the oxygen activity range of thermodynamic cell measurements compared to the range of a single-electrolyte cell arrangement [Shores Rapp, 1971 Tretyakov Muan, 1969],... [Pg.186]


See other pages where MIEC chemical stability is mentioned: [Pg.167]    [Pg.186]    [Pg.187]    [Pg.223]    [Pg.254]    [Pg.258]    [Pg.274]    [Pg.725]    [Pg.729]    [Pg.732]    [Pg.333]    [Pg.7]    [Pg.8]    [Pg.333]    [Pg.99]    [Pg.353]    [Pg.7]    [Pg.8]    [Pg.886]   
See also in sourсe #XX -- [ Pg.97 ]




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