用于高性能超级电容器的介孔六氰合铁酸钴纳米立方体的简便合成

Zhang Zhiyong, Wang Jian-Gan, Wei Bingqing

State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Lab of Graphene (NPU), Xi'an 710072, China.

Department of Mechanical Engineering, University of Delaware, Newark DE19716, USA.

Nanomaterials (Basel). 2017 Aug 21;7(8):228. doi: 10.3390/nano7080228.

Mesoporous cobalt hexacyanoferrate nanocubes (meso-CoHCF) were prepared for the first time through a facile sacrificial template method. The CoHCF mesostructures possess a high specific surface area of 548.5 m²·g and a large amount of mesopores, which enable fast mass transport of electrolyte and abundant energy storage sites. When evaluated as supercapacitor materials, the meso-CoHCF materials exhibit a high specific capacitance of 285 F·g, good rate capability and long cycle life with capacitance retention of 92.9% after 3000 cycles in Na₂SO₄ aqueous electrolyte. The excellent electrochemical properties demonstrate the rational preparation of mesoporous prussian blue and its analogues for energy storage applications.

首次通过简便的牺牲模板法制备了介孔六氰合铁酸钴纳米立方体（meso-CoHCF）。CoHCF介观结构具有548.5 m²·g的高比表面积和大量的介孔，这使得电解质能够快速进行质量传输并提供丰富的储能位点。当作为超级电容器材料进行评估时，meso-CoHCF材料表现出285 F·g的高比电容、良好的倍率性能和长循环寿命，在Na₂SO₄水性电解质中循环3000次后电容保持率为92.9%。优异的电化学性能证明了介孔普鲁士蓝及其类似物在储能应用中的合理制备。