Cathodic Polarization Phenomena of Perovskite Oxide Electrodes with Stabilized Zirconia
Cathodic Polarization Phenomena of Perovskite Oxide Electrodes with Stabilized Zirconia
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DOI：
10.1149/1.2100267
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发表时间：
1987-11
影响因子：
3.9
通讯作者：
Y. Takeda;R. Kanno;M. Noda;Y. Tomida;O. Yamamoto
中科院分区：
文献类型：
--
作者：
Y. Takeda;R. Kanno;M. Noda;Y. Tomida;O. Yamamoto
阴极极化的La，。rSr.，. MO.~在800~ 1000 ℃空气气氛下，研究了在氧化钇稳定的氧化锆电解液上溅射的Cr，Mn，Fe，Co四种金属离子的电极。La~.~. Sr~ CoO：~ _~。体系具有较高的氧还原活性。电极电阻随Po~和温度变化的研究表明，氧还原的速率控制步骤为：La~，SrrCoO：~的电荷转移过程，La~，SrrCoO：~的表面氧分子解离过程。Sr~ FeO.~ _：和La，_.，Sr~ MnO：~，La，. Sr，.：~ CrO：~. La_xSr_xCoO：~具有显著的电极活性，这是由于La_xSr_xCoO：~具有高的氧离子扩散能力和氧分子的高解离能力，从而具有较大的有效反应表面积。在La中，_xSr~. MO：~（M= Mn，Fe），氧分子解离能力低于La，. rSrxCoO：~~。近年来，高温固体氧化物电解质燃料电池（SOFC）受到人们的广泛关注。然而，一个有用的设备的实现取决于是否解决了由高工作温度引起的许多材料问题。在这些问题中，阴极材料的选择占据重要位置（1-3）。用于高温SOFC的阴极材料必须满足以下要求：高的电子传导性、热稳定性和化学稳定性、足够大的表面积（孔隙率）、在电解质表面的良好粘附性以及对氧分子解离的催化活性。钙钛矿族中的一些复合氧化物已被认为满足大多数上述要求。该电池由 * 电化学学会积极成员。
The cathodic polarization of the La,. rSr.,. MO.~ z (M= Cr, Mn, Fe, Co) electrodes sputtered on yttria stabilized zirconia electrolyte was studied at 800~ in air. The La~.~. Sr~ CoO:~ _~. system showed high electrode activity for oxygen reduction. The study of the electrode resistance as functions of Po~ and temperature revealed that the rate-determining steps for oxygen reduction were as follows: the charge transfer process for La~ _, SrrCoO:~~, the dissociation of oxygen molecules on the surface for La,.~ Sr~ FeO.~ _: and La, _., Sr~ MnO:~~, and the oxygen diffusion on the electrode surface for La,.~ Sr,.:~ CrO:~. The marked electrode activity of La, _xSrxCoO:~ _~ was explained by the large effective reaction surface area, which is caused by the high oxide ion diffusivity and the high dissociation ability of oxygen molecules. In La, _xSr~. MO:~ _~(M= Mn, Fe), the ability of the dissociation of oxygen molecules was considered to be lower than that in La,. rSrxCoO:~~. The low activity of Cr-perovskite electrode was explained by the low diffusivity of oxygen ions.Recently, high temperature solid oxide electrolyte fuel cells (SOFC) have become of great interest. However, the realization of a useful device is dependent on whether the many material problems arising from the high operating temperature will be solved. Of these problems, the selection of the cathode materials holds an important position (1-3). The cathode material for a high temperature SOFC has to meet the following requirements: high electronic conductivity, thermal and chemical stability, sufficiently large surface area (porosity), good adherence at the surface of the electrolyte, and the catalytic activity for the dissociation of oxygen molecules. Some complex oxides in the perovskite family have been suggested as satisfying most of the above requirements. The cell per-* Electrochemical Society Active Member.