二维失配层状Ca3Co4O9-δ阴极及其纳米复相阴极的电化学性能和氧催化作用机理

项目名称： 二维失配层状Ca3Co4O9-δ阴极及其纳米复相阴极的电化学性能和氧催化作用机理

项目编号： No.51262020

项目类型： 地区科学基金项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 朱成军

作者单位： 内蒙古大学

项目金额： 49万元

中文摘要： 二维失配型层状结构Ca3Co4O9-δ（Ca349）氧化物是热电材料领域新兴的一种材料，但它有与电解质相近的热膨胀系数（TEC）、适宜的电导率和较好氧催化活性，在固体氧化物燃料电池（SOFCs）阴极方面有良好的应用前景。本项目针对以往阴极材料中高TEC及单相阴极氧离子电导率低和表面氧交换动力学不足的特点，提出采用高分子网络凝胶法制备具有低TEC的Ca349材料，并研发Ca349及其纳米颗粒浸渍Ca349-SDC复相新型材料的阴极性能，以解决由于高TEC而引起的热失配问题，同时，发挥纳米Ca349微粒和SDC电解质之间对氧的协同催化作用，促进阴极吸氧能力和表面氧交换动力学。研究Ca349阴极及纳米浸渍阴极的微结构、输运性能、热物理性能及其电化学性能，揭示它们的氧催化作用微观机理。并将其应用于SOFCs中，研究电池稳定性和电化学特性，进一步探索阴极物质体系及微结构与物理、化学性能的内在规率。

中文关键词： 固体氧化物燃料电池；离子溶液浸渍；纳米结构Ca3Co4O9-δ-SDC复合阴极；协同催化作用；电化学性能

英文摘要： The 2D-misfit-layered structure Ca3Co4O9-δ(Ca349)oxide is an emerging material in the field of thermoelectric materials. But it also has the potential application as the cathode material of SOFCs due to its similar thermal expansion coefficient (TEC) with electrolyte, appropriate electrical conductivity and good oxygen catalytic properties. The project contraposes the high TEC of the preceding cathode materials and low oxygen ion conductivity and insufficient surface oxygen exchange dynamics characteristics of single-phase cathode materials, proposes research and development of the novel materials for the Ca349 cathode prepared by a polyacrylamide gel route with low TEC and Ca349 nano-particles impregnated SDC composite cathode, in order to solve the thermal mismatch problem caused by high TEC, and at the same time, play a synergistic catalytic effect of oxygen between the Ca349 nano-particles and the SDC electrolyte, and promote the oxygen adsorption ability and surface oxygen exchange kinetics of the cathode.Study the microstructure, the transport properties, thermal and physical properties and its electrochemical properties of Ca349 cathode and nanoparticles impregnated cathode, revealing their microscopic mechanism of oxygen catalysis. And in SOFCs, study the stability and electrochemical properties of the c

英文关键词： Solid oxide fuel cell；The synergistic catalytic effect；Ion solution impregnation；Nano-structured Ca349-SDC composite cathode；The electrochemical performances