Xiang Nannan, Ni Yonghong, Ma Xiang
College of Chemistry and Materials Science, Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, Anhui Key Laboratory of Functional Molecular Solids, Anhui Normal University, 1 Beijing Eastern Road, Wuhu, 241000, PR China.
Centres of Modern Analyses, Nanjing University, 23 Hankou Road, Nanjing, 210093, PR China.
Chem Asian J. 2015 Sep;10(9):1972-8. doi: 10.1002/asia.201500386. Epub 2015 Jul 14.
The shape-controlled synthesis of NiCo2 O4 microstructures through a facile hydrothermal method and subsequent calcinations was explored. By employing CoSO4 , NiSO4 , and urea as the starting reactants, flower-like NiCo2 O4 microstructures were obtained at 100 °C after 5 h without the assistance of any additive and subsequent calcination at 300 °C for 2 h; dumbbell-like NiCo2 O4 microstructures were prepared at 150 °C after 5 h in the presence of trisodium citrate and subsequent calcination at 300 °C for 2 h. The as-prepared NiCo2 O4 microstructures were characterized by X-ray powder diffraction, field-emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, and (high-resolution) transmission electron microscopy. Both the flower-like and dumbbell-like NiCo2 O4 microstructures could be used as electrode materials for supercapacitors, and they exhibited excellent electrochemical performance, including high specific capacitance, good rate capability, and excellent long-term cycle stability. Simultaneously, the shape-dependent electrochemical properties of the product were investigated.
探索了通过简便的水热法及后续煅烧来进行NiCo₂O₄微结构的形状控制合成。以CoSO₄、NiSO₄和尿素作为起始反应物，在无任何添加剂辅助的情况下，于100 °C反应5小时后得到花状NiCo₂O₄微结构，随后在300 °C煅烧2小时；在柠檬酸钠存在下，于150 °C反应5小时后制备出哑铃状NiCo₂O₄微结构，随后在300 °C煅烧2小时。通过X射线粉末衍射、场发射扫描电子显微镜、能量色散X射线光谱和（高分辨率）透射电子显微镜对所制备的NiCo₂O₄微结构进行了表征。花状和哑铃状NiCo₂O₄微结构均可用作超级电容器的电极材料，且它们展现出优异的电化学性能，包括高比电容、良好的倍率性能和出色的长期循环稳定性。同时，研究了产物的形状依赖性电化学性质。
