Recently, Zhao Zhigang's research group of the Suzhou Nanotechnology Institute of the Chinese Academy of Sciences and the Qifengxia Research Group of Suzhou University have jointly developed a novel tungsten oxide quantum dot electrode material with ultra-fast electrochemical response performance. The results were published in the recently published international journal "Advanced Materials."
Emerging energy conversion and storage devices such as lithium-ion batteries, supercapacitors, and fuel cells have shown great potential in solving the problems of traditional energy shortages and unstable energy sources of renewable energy. They have attracted extensive attention from the academic and industrial communities. The realization of fast and efficient electron and ion transfer processes in electrode materials is a goal pursued by people and is also a core technical issue for improving the performance of related devices.
Compared with traditional bulk materials, the small size, large specific surface area, and high surface atomic ratio of quantum dots (zero-dimensional nanomaterials) mean that the material is in contact with the electrolyte and the shorter ion diffusion distance is ideal. Electrode material. However, the application of quantum dots to electrochemistry is mostly unsatisfactory, which is closely related to the poor electrochemical activity of common quantum dot materials, surface organic ligand coating, and high interfacial resistance between particles.
Zhao Zhigang's research group and Qi Fengxia's research group conducted research on this issue and made breakthroughs in the research on the preparation of tungsten oxide quantum dots and their electrochemical applications. They use tungsten-based metal organic complexes as precursors, single fatty amines as reactants and solvents, and obtain uniform nanocrystals that can be monodispersed in organic solvents, and observe strong quantum size effects and solve the tungsten oxide quantum. The points are difficult to obtain and must rely on the difficulties of preparing lattice templates (silica gel, molecular sieves).
The researchers further demonstrated the electrochemical performance of quantum dots in charge-discharge and electrochromic tests that are superior to non-zero-dimensional tungsten oxide and other inorganic electrochromic materials through simple ligand exchange. The future is expected to greatly expand the application of quantum dot materials in the field of ultra-fast response electrochemical devices. (Reporter Wang Yi correspondent Cassia)
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