Porous indium oxide hollow spheres (PIOHS) for asymmetric electrochemical supercapacitor with excellent cycling stability

Directly grown two dimensional In2S3 nanoflakes via one-step solvothermal method: Material properties on In2S3 and performance data for supercapacitors

Herein, the material structural properties such as phase, morphology, chemical composition, and surface area for In₂S₃ nanoflakes, synthesized by a one-step solvothermal method, are studied [1]. The comparative electrochemical performance data of indium based electrode material is presented to establish the practical suitability of prepared In₂S₃ electrode material. Device demonstration of fabricated solid-state supercapacitor device on different time frames set performance level demonstration of current work and suggest a potential candidate for next-generation energy storage electrode material.

Charcoal derived graphene quantum dots for flexible supercapacitor oriented applications

In this article, charcoal is used as a new raw material for the synthesis of high yield graphene quantum dots (GQDs) for supercapacitor application.

Boosting the energy storage densities of supercapacitors by incorporating N-doped graphene quantum dots into cubic porous carbon

Hierarchical N-doped porous carbon has been prepared by assembling N-doped graphene quantum dots (N-GQDs) onto a carbonized metal-organic framework (cMOF-5) and used as an electrode material for supercapacitors. In this hierarchical composite structure, cMOF-5 provides an effective cubic porous framework with a large specific surface area and good electrical conductivity, while N-GQDs play an important role in enhancing the pseudocapacitive activity and improving the surface wettability of the electrode. Therefore, the N-GQD/cMOF-5 composite electrode material exhibits an outstanding specific capacitance of 780 F g-1 at 10 mV s-1 in a three-electrode system. Moreover, the composite electrode assembled in symmetric supercapacitors also displays a high specific capacitance of 294.1 F g-1 at 0.5 A g-1, excellent rate capacity and remarkable cycling stability with 94.1% of the initial capacitance retained after 5000 cycles at 5 A g-1. When used as the positive electrode, the N-GQD/cMOF-5//AC asymmetric supercapacitor exhibits an energy density of 14.4 W h kg-1 at a power density of 400.6 W kg-1, while the capacitance retention after 5000 cycles reaches 90.1%. The current N-GQD/cMOF-5 composite electrode paves a feasible avenue to improve the capacitive performances of supercapacitors by constructing heteroatom-doped, hierarchically porous carbon architectures.

Synthesis of self-assembled mesoporous 3D In2O3 hierarchical micro flowers composed of nanosheets and their electrochemical properties

This report describes the methodology for the fabrication of mesoporous In₂O₃ microflowers by hydrothermal and calcination procedures in which In(OH)₃/In₂S₃ acts as an intermediate. Both In₂O₃ and its precursor were analyzed with scanning electron microscopy, energy dispersive X-ray spectrophotometry, transmission electron microscopy and powder X-ray diffraction. BET surface area, pore size and pore volume analyses were also carried out. Electron microscopy images clearly evidence the self-assembly of 2D nanosheets into the micro flower structure. The mechanism of self-assembly and calcination is reported. Electrochemical properties of the synthesized In₂O₃ micro flowers were studied.

This report describes the methodology for the fabrication of mesoporous In₂O₃ microflowers by hydrothermal and calcination procedures in which In(OH)₃/In₂S₃ acts as an intermediate.