Calcination activation of three-dimensional cobalt organic phosphate nanoflake assemblies for supercapacitors,Inorganic Chemistry Frontiers

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Calcination activation of three-dimensional cobalt organic phosphate nanoflake assemblies for supercapacitors
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2021-08-04 , DOI: 10.1039/d1qi00797a
Qingling Jing _{1,

2,

3,

4} , Wenting Li _{1,

2,

3,

4} , Jiajing Wang _{1,

2,

3,

4} , Xudong Chen _{1,

2,

3,

4} , Huan Pang _{1,

2,

3,

4}

Affiliation

Three-dimensional (3D) metal–organic framework (MOF) assemblies at the micro-nanoscale have garnered considerable interest because of their extensive applications. Herein, three-dimensional cobalt organic phosphate (COP) nanoflake precursors were obtained by a simple self-assembly method. Further, COP assemblies were obtained via the low-temperature calcination activation of the precursors in air, and the obtained assemblies preserved the nanoflake structure of the precursors by exposing an increased number of active sites. When the COP assemblies were directly used as electrode materials for supercapacitors (SCs), their performance greatly exceeded that of pure MOFs. As a proof of concept, a sample activated at 200 °C was used as the electrode material in SCs, and the specific capacitance reached 274.32 F g⁻¹ under 0.5 A g⁻¹. Moreover, an asymmetric SC device comprising COP//activated carbon was assembled, and it exhibited a long cycle stability, with a decay rate of only 0.39% after more than 3000 charge–discharge cycles. These results demonstrate that multilayer COP can potentially be applied as an electrode material for electrochemical capacitors.

中文翻译：

用于超级电容器的三维有机磷酸钴纳米片组件的煅烧活化

微纳米尺度的三维（3D）金属-有机框架（MOF）组件因其广泛的应用而引起了人们的极大兴趣。在此，通过简单的自组装方法获得了三维有机磷酸钴（COP）纳米片前驱体。此外，COP组件是通过前体在空气中的低温煅烧活化获得的，并且所获得的组件通过暴露更多的活性位点来保持前体的纳米薄片结构。当 COP 组件直接用作超级电容器 (SC) 的电极材料时，其性能大大超过了纯 MOF。作为概念证明，在 200 °C 下激活的样品用作 SCs 中的电极材料，比电容达到 274.32 F g^-1低于 0.5 A g^-1。此外，组装了包含 COP//活性炭的非对称 SC 器件，它表现出长循环稳定性，在超过 3000 次充放电循环后衰减率仅为 0.39%。这些结果表明多层 COP 有可能用作电化学电容器的电极材料。

更新日期：2021-08-09

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