Nanosheet-Assembled MnO2-Integrated Electrode Based on the Low-Temperature and Green Chemical Route

Crystals

Yin Wang¹  Xinyu Zhao¹  Xiaoli Wang² 

[1] Inner Mongolia Key Laboratory of Carbon Nanomaterials and Inner Mongolia Key Laboratory for the Natural Products Chemistry and Functional Molecular Synthesis, College of Chemistry and Materials Science, Inner Mongolia Minzu University, Tongliao 028000, China;Liaoning Key Laboratory of Chemical Additive Synthesis and Separation, Department of Chemistry and Environment Engineering, Yingkou Institute of Technology, Yingkou 115014, China;

关键词: nanosheets;    MnO₂;    green chemistry;    supercapacitor;   

DOI  :  10.3390/cryst12010115

来源: DOAJ

【 摘 要 】

The development of superior electrochemical energy-storage devices designed through a facile, cost-efficient, and green synthesis technique is the key to addressing the intermittent nature of renewable energy sources such as solar and wind energy. In our present work, we design a simple, surfactant-free, and low-temperature chemical strategy to prepare novel integrated, MnO₂ composite electrodes with two-dimensional (2D) nanosheet film directly supported on three-dimensional (3D) conductive nickel foam. Benefiting from the specific 2D nanosheet architecture to provide a large interfacial contact area and highly conductive metal scaffolds to facilitate fast electron transfer, the novel nanosheet-assembled MnO₂-integrated electrodes exhibit higher specific capacitance of 446 F g⁻¹ at the current density of 1 A g⁻¹ compared with nanostructured MnO₂ and commercial MnO₂ powder electrodes. More importantly, the as-synthesized devices are able to achieve an outstanding cycling performance of 95% retention after 3000 cycles. The present work, which is based on the low-temperature chemical route to deposit active materials on the conductive substrate, provides new insights into designing a binder-free supercapacitor system to improve the specific capacitance, cycling, and rate performance as next-generation, energy-storage devices.

【 授权许可】

Unknown