Melamine-assisted synthesis of cobalt–nickel coordination polymers as electrode materials for supercapacitors
Melamine-assisted synthesis of cobalt–nickel coordination polymers as electrode materials for supercapacitors
复制标题
DOI：
10.1007/s10853-021-06187-4
复制
发表时间：
2021-05
影响因子：
4.5
通讯作者：
Shuai Wang;Mengdan Li;Guo-Xin Qin;Yu‐Bin Dong
中科院分区：
文献类型：
--
作者：
Shuai Wang;Mengdan Li;Guo-Xin Qin;Yu‐Bin Dong
配位聚合物(CP)和/或金属有机骨架(MOF)是一种新型的超级电容器活性材料。在本研究中，我们通过溶剂热的方法，进行了三聚氰胺辅助合成具有可控结构的双金属CPS(Co-Ni CPS)。三聚氰胺的浓度对Co-Ni CPS的形貌有重要影响，CPS可以由微球转变为纳米棒。采用Co-Ni CP作为SC的电极材料。球形Co-Ni-Cp-M在电流密度分别为1A g−1和10A g−1时的比容量分别为677F g−1和585F g−1，表明在2.0M KOH电解液的三电极体系中具有优异的倍率性能。此外，Co-Ni-CP-M//活性碳器件表现出优异的长期循环稳定性，即在10A g−1in2.0MKOH电解液中循环10,000次后，初始容量的保持率约为92.6%。此外，非对称SC器件在700W/kg−1的功率密度下获得了28.35W/kg−1的优异能量密度。
Coordination polymers (CPs) and/or metal–organic frameworks (MOFs) are new active materials for supercapacitors (SC). In this study, by solvothermal route, we conduct the melamine-assisted synthesis of bimetallic CPs (Co–Ni CPs) with controllable structures. The concentration of melamine plays an important role in the morphology of Co–Ni CPs, and the CPs can be turned from microspheres to nanorods. The Co–Ni CPs are used as electrode materials for SC. The spherical Co–Ni–CP-M exhibits the highest capacitances of 677 F g−1and 585 F g−1at current densities of 1 A g−1and 10 A g−1, respectively, indicating an outstanding rate capability in a three-electrode system with 2.0 M KOH electrolyte. Furthermore, the Co–Ni–CP-M//active carbon device shows superior long-term cycling stability, i.e., approximately 92.6% of the initial capacitance can be retained after 10,000 cycles at 10 A g−1in 2.0 M KOH electrolyte. In addition, the asymmetric SC device achieves an excellent energy density of 28.35 W h kg−1at a power density of 700 W kg−1.Graphical abstract