Ramkumar Ramya, Minakshi Manickam
Energy, School of Engineering and Information Technology, Murdoch University, WA 6150, Australia.
Dalton Trans. 2015 Apr 7;44(13):6158-68. doi: 10.1039/c5dt00622h.
Ultrathin nanosheet-assembled cobalt molybdate (CoMoO4) with a mesoporous morphology was synthesized by a urea-assisted solution combustion route at a temperature of 400 °C. The as-prepared CoMoO4 was modified using chitosan cross-linked with glutaraldehyde (glu) and employed as a cathode material in an aqueous hybrid capacitor. The physical and electrochemical behaviour of CoMoO4 modified with chitosan and the as-prepared (chitosan free) CoMoO4 has been compared and discussed. The modified CoMoO4 exhibited excellent electrochemical performance with a specific capacitance of 135 F g(-1) at 0.6 A g(-1) and an energy density of 31 W h kg(-1). It also exhibited good cycling stability with high coulombic efficiency over 2000 cycles retaining a specific capacitance of 81 F g(-1) at 3 A g(-1), comparatively much better than that of nanostructured chitosan free CoMoO4 which yielded 17 F g(-1). The results indicated that chitosan gel strongly adheres to the molybdate moiety of CoMoO4 and increases the capacitance four-fold compared to a chitosan free material. The modified CoMoO4 electrode shows potential for high performance, and is an environmentally friendly and low-cost energy storage device.
通过尿素辅助溶液燃烧法在400℃合成了具有介孔形态的超薄纳米片组装钼酸钴（CoMoO4）。将所制备的CoMoO4用与戊二醛（glu）交联的壳聚糖进行改性，并用作水性混合电容器的阴极材料。对壳聚糖改性的CoMoO4和所制备的（不含壳聚糖）CoMoO4的物理和电化学行为进行了比较和讨论。改性后的CoMoO4表现出优异的电化学性能，在0.6 A g(-1)时比电容为135 F g(-1)，能量密度为31 W h kg(-1)。它还表现出良好的循环稳定性，在2000次循环中具有高库仑效率，在3 A g(-1)时比电容保持在81 F g(-1)，相比不含纳米结构壳聚糖的CoMoO4（其比电容为17 F g(-1)）要好得多。结果表明，壳聚糖凝胶与CoMoO4的钼酸根部分强烈粘附，与不含壳聚糖的材料相比，电容增加了四倍。改性后的CoMoO4电极显示出高性能的潜力，是一种环保且低成本的储能装置。
