New Nanostructured Transition Metal Oxides for High-Performance Supercapacitors

用於高性能超級電容器的新型納米結構過渡金屬氧化物

Student thesis: Doctoral Thesis

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Award date28 Jul 2017

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Abstract

This thesis focuses on the physical and electrochemical investigation of the active electrode materials with enhanced electrochemical behaviors for supercapacitors to satisfy the requirement of the clean and reliable energy storage devices. Because of the high specific capacitance, low cost, abundance in resources, facile and scalable preparation, nanostructured transition metal oxides (TMOs) have been considered as the desirable electrode materials for high-performance supercapacitors. However, several drawbacks including the low electron conductivities, slow ion diffusion rates, and big volume change during the electrochemical measurements limit their further applications. Scrupulous design and fabrication of the nanostructured TMOs and also the growth of them on conductive current collectors or the synthesis of composites with flexible reduced graphene are effective approaches to significantly boost the electrochemical properties of the electrode materials.
In this thesis, several types of the Ni foam supported TMOs such as ZnCo2O4 microspheres, Zn-Ni-Co nanowire arrays and core/shell CuO@NiCo2O4 nanowire heterostructure arrays are successfully prepared via a two-step facile strategy involving hydrothermal method and subsequent calcination process. In addition, to enhance the supercapacitive behaviors of the off-substrate TMOs materials used for supercapacitors, nanostructured hybrid reduced graphene oxide (RGO) nanosheets supported Mn-Ni-Co ternary oxides have been fabricated and characterized. Benefited by their advantageous structural features and advanced electrode architectures, the as-prepared electrode materials demonstrate improved electrochemical supercapacitive performances in terms of high specific capacitance, desirable rate capability and excellent cycling stability.

    Research areas

  • Nanostructured materials, Transition metal oxides, Supercapacitors, Energy storage devices