Zhang Yufei, Ma Mingze, Yang Jun, Su Haiquan, Huang Wei, Dong Xiaochen
School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, Inner Mongolia, China.
Nanoscale. 2014 Apr 21;6(8):4303-8. doi: 10.1039/c3nr06564b.
Hierarchical mesoporous spinel NiCo₂O₄ was synthesized by a facile hydrothermal method assisted by polyvinylpyrrolidone (PVP) and a post annealing treatment. The synthesized hierarchical mesoporous NiCo₂O₄ presents a hierarchical mesoporous structure with diameters of 5.0 and 25 nm, respectively. Compared to conventional flower-like NiCo₂O₄, the hierarchical mesoporous structured NiCo₂O₄ exhibits excellent supercapacitor performance. The specific capacitance can reach 1619.1 F g(-1) at a current density of 2.0 A g(-1). When the current density is increased to 10.0 A g(-1), a specific capacitance of 571.4 F g(-1) can be obtained. Furthermore, the hierarchical mesoporous structured NiCo₂O₄ presents excellent stability. The outstanding electrochemical performance of the hierarchical mesoporous NiCo₂O₄ reveals its potential to be a promising material for use in supercapacitors, and also inspires continued research on binary metal oxides as energy transformation materials.
通过聚乙烯吡咯烷酮（PVP）辅助的简便水热法和后续退火处理合成了分级介孔尖晶石NiCo₂O₄。合成的分级介孔NiCo₂O₄呈现出分级介孔结构，其直径分别为5.0和25纳米。与传统的花状NiCo₂O₄相比，分级介孔结构的NiCo₂O₄表现出优异的超级电容器性能。在电流密度为2.0 A g(-1)时，比电容可达1619.1 F g(-1)。当电流密度增加到10.0 A g(-1)时，可获得571.4 F g(-1)的比电容。此外，分级介孔结构的NiCo₂O₄具有出色的稳定性。分级介孔NiCo₂O₄出色的电化学性能揭示了其作为超级电容器中一种有前景材料的潜力，也激发了对二元金属氧化物作为能量转换材料的持续研究。
