Qian Liu, Zengqi Guo, Zhiwei Xu, Cong Wang, Wai-Yeung Wong
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引用次数: 0
摘要
为了应对日益严重的能源短缺问题,超级电容器作为一种清洁的可再生能源被开发出来,具有优异能量密度和长循环寿命的超级电容器势在必行。本文采用液-液(L-L)界面法,在室温(RT)下通过Co2+离子与2,3,6,7,10,11-六亚氨基三亚苯(HITP)的简单配位合成了一组二维(2D)金属复合物纳米片N1-N3。由于 N1-N3 电极具有层状上层结构和有序的纳米孔,因此在 1 A g-1 的条件下,N1-N3 电极的容量分别为 4751.9、5770.9 和 6075.2 F g-1,并且具有良好的循环稳定性,N3 电极在 1000 次循环后的容量保持率为 92.1%。以 N3 为正极的非对称超级电容器装置在功率密度为 1610.1 W kg-1 时的最大能量密度为 238.2 Wh kg-1,循环稳定性极佳,5000 次循环后电容保持率为 109.1%。这是迄今为止报道的用于超级电容器的最佳电活性自下而上金属复合物纳米片,极大地扩展了这种二维纳米材料在能源设备应用中的适用性。
Conjugated cobalt-based metal complex nanosheet for fabricating high-performance supercapacitor electrode
In order to cope with the increasingly serious problem of energy shortage, supercapacitors have been developed as a clean and renewable energy source, and the supercapacitors with excellent energy density and long cycle life are imperative. Here, by employing a facile liquid–liquid (L-L) interfacial method at room temperature (RT), a set of two-dimensional (2D) metal complex nanosheets N1-N3 have been synthesized by the facile coordination between Co2+ ion and 2,3,6,7,10,11-hexaiminotriphenylene (HITP). Given the layered superstructure with well-ordered nanopores, the N1-N3 electrodes displayed excellent capacities of 4751.9, 5770.9 and 6075.2 F g−1 at 1 A g−1, and a good cyclic stability with 92.1% capacity retention after 1000 cycles for the N3 electrode. The asymmetric supercapacitor device with N3 as the positive electrode delivers a maximum energy density of 238.2 Wh kg−1 at a power density of 1610.1 W kg−1 and an excellent cycling stability with a capacitance retention of 109.1% after 5000 cycles. This is the best electroactive bottom-up metal complex nanosheet reported so far for use in supercapacitor, which greatly expands the applicability of this 2D nanomaterial in energy device applications.