Chen Huilong, Lu Shuang, Gong Feilong, Liu Huanzhen, Li Feng
State Laboratory of Surface and Interface Science and Technology, Zhengzhou University of Light Industry, Zhengzhou 450002, China.
American Advanced Nanotechnology, Houston, TX 77459, USA.
Nanomaterials (Basel). 2017 Apr 10;7(4):81. doi: 10.3390/nano7040081.
Three-dimensional hierarchical Co₃O₄ nanobooks have been synthesized successfully on a large scale by calcining orthorhombic Co(CO₃)(OH)·0.11H₂O precursors with identical morphologies. Based on the influence of reaction time and urea concentration on the nanostructures of the precursors, a stepwise splitting growth mechanism can be proposed to understand the formation of the 3D nanobooks. The 3D Co₃O₄ nanobooks exhibit excellent pseudocapacitive performances with specific capacitances of 590, 539, 476, 453, and 421 F/g at current densities of 0.5, 1, 2, 4, and 8 A/g, respectively. The devices can retain ca. 97.4% of the original specific capacitances after undergoing charge-discharge cycle tests 1000 times continuously at 4 A/g.
通过煅烧具有相同形貌的正交晶系Co(CO₃)(OH)·0.11H₂O前驱体，成功大规模合成了三维分层Co₃O₄纳米书。基于反应时间和尿素浓度对前驱体纳米结构的影响，可以提出一种逐步分裂生长机制来理解三维纳米书的形成。三维Co₃O₄纳米书表现出优异的赝电容性能，在电流密度分别为0.5、1、2、4和8 A/g时，比电容分别为590、539、476、453和421 F/g。在4 A/g下连续进行1000次充放电循环测试后，该器件可保留约97.4%的原始比电容。
