Yttrium-doped barium zirconate (BZY) is accepted as one of the most promising electrolyte materials for protonic ceramic fuel cells (PCFCs). For the development of fuel cells with the BZY electrolytes, evaluation of electrode performance is important. In this work, electrochemical measurements of an electrolyte supported cell, Pd (wet H[2]) | BaZr[0.8]Y[0.2]O[3-δ] | La[0.6]Sr[0.4]Co[0.2]Fe[0.8]O[3-δ] (wet O[2]), were performed at 600°C in a three-electrode system. The ohmic resistances of the electrolyte under open circuit condition and DC current flow were evaluated by AC impedance and current interruption measurements, respectively. Overpotentials of cathode and anode are determined to be 0.587 and 0.053 V at 100 mAcm[−2], respectively, and exhibit a logarithmic relationship with current density. The results clearly indicate that high cathode overpotential is a significant problem restricting the fuel cell performance.
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机译:钇掺杂锆酸钡(BZY)被公认为是质子陶瓷燃料电池(PCFC)最有希望的电解质材料之一。对于开发具有BZY电解质的燃料电池,评估电极性能非常重要。在这项工作中,对电解质支持的电池Pd(湿H [2])进行电化学测量。 BaZr [0.8] Y [0.2] O [3-δ] |在三电极系统中,在600℃下进行La [0.6] Sr [0.4] Co [0.2] Fe [0.8] O [3-δ](湿式O [2])。分别通过交流阻抗和电流中断测量来评估开路条件下电解液的欧姆电阻和直流电流。正极和负极的过电势在100 mAcm [-2]下分别确定为0.587和0.053 V,并且与电流密度呈对数关系。结果清楚地表明,高阴极超电势是限制燃料电池性能的重大问题。
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