文章摘要
接枝聚合聚苯胺/CeO2-COOH复合材料的性能及聚合机制
Graft Polymerization Mechanism and Properties of Polyaniline/CeO2-COOH Composites
  
DOI:10.16865/j.cnki.1000-7555.2019.0351
中文关键词: 接枝聚合  羧基化CeO2  聚苯胺/CeO2-COOH复合材料  电化学性能  聚合机制
英文关键词: graft polymerization  carboxylated CeO2  polyaniline /CeO2-COOH composites  electrochemical performance  polymerization mechanism
基金项目:国家自然科学基金资助项目(51504111)
作者单位
张盼盼,黄 惠,金 磊,何亚鹏,郭忠诚 昆明理工大学 冶金与能源工程学院云南 昆明 650093 
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中文摘要:
      对二氧化铈(CeO2)进行羧基化改性得到羧基化二氧化铈(CeO2-COOH),并与苯胺(An)接枝聚合得到核壳结构聚苯胺/二氧化铈复合材料(PANI/CeO2-COOH)。采用红外光谱、X射线光电子能谱、X射线衍射、热重分析、扫描电子显微镜及旋转圆盘电化学测试技术分析材料的结构及性能。结果表明,CeO2-COOH的CeIII/CeIV的比值接近1,具有较高的表面氧空位;PANI/CeO2-COOH中PANI接枝效果较好,而且与纯PANI结构相同;CeO2-COOH与PANI之间通过价键接枝形成的PANI/CeO2-COOH复合材料起始分解温度在228 ℃左右,且在200~600 ℃内的分解速率较慢,表现出较好的热稳定性;在1 mol/L H2SO4中对电极进行循环伏安和恒电流充放电测试,PANI/CeO2-COOH复合材料电极不仅具有良好的峰对称性和最高阳极峰电流,而且还具有较好的电容性能,当电流密度为0.5 A/g时,比电容达到149.5 F/g。
英文摘要:
      Cerium dioxide(CeO2) was modified by carboxylation to get carboxylated cerium oxide (CeO2-COOH), and a graft polymerization took place between CeO2 and aniline (An) to get core-shell structured polyaniline composites(PANI/CeO2-COOH). The structure and properties of the materials were analyzed by FT-IR, XPS, XRD, TGA, SEM and rotating disk electrochemical testing. The results reveal that the CeIII/CeIV ratio of CeO2-COOH is approximately 1 with high surface oxygen vacancies. Meanwhile, the core-shell structured PANI/CeO2-COOH composite has the best grafting morphology, and the structure of PANI on the surface of CeO2-COOH is the same with pure PANI. PANI/CeO2-COOH is grafted via the valence bond between CeO2-COOH and PANI and shows the best thermal stability, where PANI/CeO2-COOH has the initial decomposition temperature at about 228 ℃ and the lowest decomposition rate in the range of 200~600 ℃. Cyclic voltammetry and galvanostatic charge-discharge tests were performed on composite electrodes in 1 mol/L H2SO4. The PANI/CeO2-COOH electrode not only has excellent peak symmetry and the highest anodic peak current, but also has higher capacitance performance, where the specific capacitance reaches 149.5 F/g with the current density of 0.5 A/g.
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