Cobalt induced growth of hollow MOF spheres for high performance supercapacitors,Materials Chemistry Frontiers

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Cobalt induced growth of hollow MOF spheres for high performance supercapacitors
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2020-10-21 , DOI: 10.1039/d0qm00597e
Xu Zhang _{1,

2,

3,

4,

5} , Ning Qu _{1,

2,

3,

4,

5} , Shixuan Yang _{1,

2,

3,

4,

5} , Da Lei _{1,

2,

3,

4,

5} , Anmin Liu _{1,

2,

3,

4,

5} , Quan Zhou _{4,

6,

7,

8}

Affiliation

The development of highly-efficient metal organic framework (MOF) based supercapacitors has attracted much attention. In this work, hollow structure Ni/Co-MOFs have been facilely synthesized by using Co ions as structure-directing agents. Various structures of MOFs, such as hollow, yolk–shell and solid spheres, can be easily obtained through adjusting the molar ratio of Ni/Co. The introduction of an appropriate amount of Co ions can induce the formation of hollow spheres, where the hollow structure can offer rich redox reaction sites and provide fast transport pathways. Moreover, adsorption simulations and density of states calculations illustrate that the adsorbability of OH⁻ and the electrochemical activity on the mixed-metallic MOFs are improved after introducing the Co ions, which can promote the reversible redox reaction activity of the electrode materials. The as-obtained hollow Ni/Co-MOF with the optimized amount of Co ions yields a high capacitance of 1498 F g⁻¹ at 1 A g⁻¹, an excellent rate capability of 67% capacitance retention at 30 A g⁻¹ and a good cycling stability of 71% after 3000 cycles at 5 A g⁻¹. This work may provide useful guidance for tuning the structure and electronic properties of MOFs to enhance the electrochemical performance for supercapacitors.

中文翻译：

钴诱导的高性能MOF空心MOF球的生长

基于高效金属有机骨架（MOF）的超级电容器的开发吸引了很多关注。在这项工作中，已经通过使用Co离子作为结构导向剂轻松合成了中空结构Ni / Co-MOF。通过调节Ni / Co的摩尔比，可以轻松获得MOF的各种结构，例如空心，卵黄壳和实心球。引入适量的Co离子可以诱导空心球的形成，其中空心结构可以提供丰富的氧化还原反应位点并提供快速的运输途径。此外，状态计算的吸附模拟和密度示出OH的是，吸附^-引入Co离子后，提高了混合金属MOFs的电化学活性，可促进电极材料的可逆氧化还原反应活性。如此获得的具有最佳Co离子量的空心Ni / Co-MOF在1 A g ^-1时产生了1498 F g ^-1的高电容，在30 A g ^-1时具有67％的电容保持率，以及在5 A g ^-1下经过3000次循环后具有71％的良好循环稳定性。这项工作可为调整MOF的结构和电子性能以增强超级电容器的电化学性能提供有用的指导。

更新日期：2020-12-10

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