The new tungsten oxide electrode materials advent of quantum dots

Recently, the Chinese Academy of Sciences of the Task Force and Gengfeng Xia Zhao Zhigang Nano Research Group Suzhou, Suzhou University to develop a new type of quantum dot tungsten oxide electrode electrochemical response of a material with ultra-fast performance. The results were published in a recent issue of the international journal "Advanced Materials."

Lithium-ion batteries, supercapacitors, fuel cells and other emerging energy conversion and storage devices, in addressing the shortage of conventional energy, renewable energy, energy source of instability and other issues has shown great potential widespread concern academia and industry. Fast and efficient electronic in the electrode material, ion transport process is one goal, but also improve the core technology issues related to device performance.

Compared with the conventional bulk materials, quantum dots sufficient contact (zero-dimensional material) small size, large specific surface area, a high percentage of surface atoms means that the material with the electrolyte solution and the ion diffusion distance is shorter, making it ideal for the electrode material. However, the findings of quantum dots used in the electrochemical mostly not ideal, which is a common quantum dots electrochemically active material difference between the surface and the organic ligand-coated particles are closely related to high interfacial resistance.

Zhao Zhigang and Gengfeng Xia Task Force Task Force conducted research on this issue, in terms of preparation and electrochemical applications of quantum dots tungsten oxide research breakthrough progress. They used a tungsten-based metal organic complexes as precursors for single fatty amine reactants and solvent, to obtain uniform size, can be a single nanocrystals dispersed in an organic solvent, and observed a strong quantum size effect, to solve the tungsten oxide quantum point is difficult to obtain, have to rely on the lattice problem template (silica gel, molecular sieves) to be produced.

The researchers further ligand exchange by simply make the quantum dots in the electrochromic discharge test, demonstrated significantly better than other non-zero dimension, and an inorganic oxide, tungsten oxide electrochromic material of the electrochemical properties. Is expected to greatly expand the quantum dot material coming fast response applications in the field of electrochemical devices.


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