Wang Meixia, Zhang Jing, Yi Xibin, Liu Benxue, Zhao Xinfu, Liu Xiaochan
Shandong Key Laboratory for Special Silicon-containing Material, Advanced Materials Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250014, P. R. China.
Beilstein J Nanotechnol. 2020 Jan 21;11:240-251. doi: 10.3762/bjnano.11.18. eCollection 2020.
In this study, a new nanoporous material comprising NiMoO nanorods and CoO nanoparticles derived from ZIF-67 supported by a cellulose-based carbon aerogel (CA) has been successfully synthesized using a two-step hydrothermal method. Due to its chemical composition, the large specific surface and the hierarchical porous structure, the NiMoO@CoO/CA ternary composite yields electrodes with an enhanced specific capacitance of 436.9 C/g at a current density of 0.5 A/g and an excellent rate capability of 70.7% capacitance retention at 5.0 A/g. Moreover, an advanced asymmetric supercapacitor (ASC) is assembled using the NiMoO@CoO/CA ternary composite as the positive electrode and activated carbon as the negative electrode. The ASC device exhibits a large capacitance of 125.4 F/g at 0.5 A/g, a maximum energy density of 34.1 Wh/kg at a power density of 208.8 W/kg as well as a good cyclic stability (84% after 2000 cycles), indicating its wide applicability in energy storage. Finally, our results provide a general approach to the construction of CA and MOF-based composite materials with hierarchical porous structure for potential applications in supercapacitors.
在本研究中，采用两步水热法成功合成了一种新型纳米多孔材料，该材料由纤维素基碳气凝胶（CA）负载的源自ZIF-67的NiMoO纳米棒和CoO纳米颗粒组成。由于其化学成分、大比表面积和分级多孔结构，NiMoO@CoO/CA三元复合材料制备的电极在电流密度为0.5 A/g时具有436.9 C/g的增强比电容，在5.0 A/g时具有70.7%的电容保持率的优异倍率性能。此外，以NiMoO@CoO/CA三元复合材料为正极、活性炭为负极组装了一种先进的非对称超级电容器（ASC）。该ASC器件在0.5 A/g时具有125.4 F/g的大电容，在功率密度为208.8 W/kg时具有34.1 Wh/kg的最大能量密度以及良好的循环稳定性（2000次循环后为84%），表明其在能量存储方面具有广泛的适用性。最后，我们的结果为构建具有分级多孔结构的基于CA和MOF的复合材料提供了一种通用方法，用于超级电容器的潜在应用。
