2D@3D MoS2@Ni/Co-S submicroboxes derived from prussian blue analogues for high performance supercapacitors

Tuning the morphology and structure at micro/nanoscale has become essential for the advancement of electrode materials for supercapacitors. Here, Ni-Co Prussian blue analogue (PBA) is used as precursor and template to synthesize 3D hollow submicroboxes coated with 2D MoS2 nanosheets (MoS2@Ni/Co-S) by one-pot solvothermal process. The study shows that the cubic voids in Ni-Co PBA submicrocubes become larger with the prolonging of solvothermal time owing to the etching reactions for Ni-Co PBA submicrocubes. MoS2@Ni/Co-S synthesized at 200 degrees C for 20 h possesses typical hollow structure, which is a multi-component active material composed of MoS2, CoS, NiS, Co and Ni, and exhibits high specific capacity of 109.8 mAh g(-1) at 1 A g(-1) and superior rate capability with 75.4% capacity retention at 20 A g(-1), the energy density of the assembled asymmetric supercapacitor is as high as 38.5 Wh kg(-1) and the device shows excellent cycling stability of 85.4% after 5000 cycles. More importantly, this work not only offers an attractive strategy to combine Ni-Co PBA and classical solvothermal process, but also provides a new insight into the design of PBAs for advanced energy materials. (C) 2022 Elsevier B.V. All rights reserved.

Automated summary

Tuning the morphology and structure at micro/nanoscale is crucial for the development of electrode materials for supercapacitors. In this study, 3D hollow submicroboxes coated with 2D MoS2 nanosheets were successfully synthesized using Ni-Co Prussian blue analogue as precursor and template. The resulting material exhibited high specific capacity, superior rate capability, and excellent cycling stability, making it a promising candidate for advanced energy materials.