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采用化学镀在高温质子导体CaZr_(0.9)In_(0.1)O_(3-δ)(CZI)的电解质陶瓷表面沉积金属镍电极,通过SEM显微结构分析比较了酸刻蚀和还原工艺对电极形貌以及电极–电解质界面的影响。结果表明,使用HNO_3-HCl混合刻蚀液,并以水合肼为还原剂的二次化学镀可获得颗粒均匀细小且界面结合良好的镍电极。通过电化学阻抗谱并结合浓差电池等方法研究比较了以化学镀镍电极和涂覆焙烧铂电极为电极,CZI为电解质的对称电池的电导率和质子迁移率。工作温度为800℃时,镍电极高温质子导体的总电导率为4.131×10~(–4) S/cm,并且工作温度在400℃以上时,镍电极对称电池的质子迁移率均接近100%。这些结果表明,二次化学镀制备的镍电极具有与铂电极相近的电化学性能,而成本则更低,可以取代Pt电极用于高温质子导体的电化学器件中。
Electroless plating was used to deposit nickel electrode on the surface of electrolyte ceramic with high temperature proton conductor CaZr_ (0.9) In_ (0.1) O_ (3-δ) (CZI). SEM and SEM were used to analyze the effect of acid etching Appearance and electrode-electrolyte interface. The results show that using HNO3-HCl mixed etching solution and hydrazine hydrate as reductant, the second electrodeposited nickel electrode can obtain uniform and fine particles and good interfacial adhesion. The electrochemical conductivity and proton mobility of a symmetric cell with electroless nickel electrode and coated roasted platinum electrode as electrodes and CZI as electrolyte were compared and studied by electrochemical impedance spectroscopy and concentration cells. When the operating temperature is 800 ℃, the total conductivity of the high temperature proton conductor of nickel electrode is 4.131 × 10 -4 S / cm, and the proton mobility of the nickel electrode symmetric battery is close to 100% when the operating temperature is above 400 ℃. . These results show that the nickel electrode prepared by the second electroless plating has the similar electrochemical performance as the platinum electrode and the lower cost, which can replace the Pt electrode for electrochemical devices with high temperature proton conductor.