Co金属有机骨架模板制备NiCo水滑石/泡沫镍复合材料及电容性能

通过两步法先在泡沫镍(nickel foam,NF)上原位生长Co金属有机骨架(Co metal-organic framework,Co-MOF)纳米片阵列，再浸入不同浓度Ni²⁺离子溶液刻蚀Co-MOF纳米片，在NF表面得到NiCo水滑石(NiCo layered double hydroxide,NiCo-LDH)。NiCo-LDH/NF继承了Co-MOF纳米片结构形成一级纳米片阵列，并在一级纳米片表面形成次级纳米片褶皱。在2 mmol Ni(NO₃)₂·6H₂O溶液中刻蚀得到的NiCo-LDH/NF表现出高容量、高倍率性能，在电流密度为5 mA·cm^-2时比电容为7 764.5 mF·cm^-2，电流密度为20 mA·cm^-2时比电容为6 098.2 mF·cm^-2，容量保持率为78.5%，在20 A·g^-1电流密度下经过5 000次长循环后，容量保持率为85.9%。与活性炭组装的混合...

Preparation by Co metal-organic framework template and capacitive properties of NiCo-layered double hydroxide/nickel foam composites

Using a two-step method,a Co metal-organic framework (Co-MOF) nanosheet array was grown in situ on nickel foam (NF),and then Co-MOF nanosheets were etched with different concentrations of Ni²⁺ ion solution to obtain NiCo layered double hydroxide (NiCo-LDH).NiCo-LDH/NF inherits the Co-MOF nano-sheet structure to form a primary nano-sheet array and a secondary nano-sheet fold on the surface of the primary nano-sheet.NiCoLDH/NF obtained by etching in 2 mmol Ni (NO₃)₂·6H₂O solution showed a small number of thin and folded secondary nano-sheets grown on the primary nano-sheet array,exhibited a high capacitance and high rate performance,had a specific capacitance of 7764.5 and 6098.2 mF·cm^-2 at a current density of 5 and 20 mA·cm^-2,and capacitance retention rate of 78.5%.After 5000 cycles at a current density of 20 A·g^-1,the capacitance retention rate was 85.9%.The hybrid capacitor assembled by NiCo-LDH/NF and active carbon achieved an maximum energy density of 38.9 Wh·kg^-1 and a maximum power density of 8000.0 W·kg^-1.