The reporter learned from Hefei University of Technology that the researchers of the school have achieved a significant increase in the electrochemical energy storage and catalytic performance of electrode materials by adjusting the intermolecular distance between the transition metal dichalcogenides in the layered structure, and for the development of high-performance electrocatalysis. With energy storage devices opened up a new path. Recent research results have been published in international journals such as "Nano Energy" and "Advanced Energy Materials."
The layered transition metal dichalcogenide nanosheet has the characteristics of controllable number of layers, ultra-thin single-layer thickness, rich two-dimensional interlayer channels, and large surface area between layers, and has excellent electrochemical performance in secondary batteries, super Capacitors, electrocatalysis and photoelectrochemical devices have good prospects for development. However, due to the narrow distance between layers of conventional layered materials, the resistance of ions to transport between layers of materials is greater, thereby limiting their electrochemical performance.
Professor Xu Jun of School of Electronic and Applied Physics at Hefei University of Technology teamed up with researchers from City University of Hong Kong to broaden the interlamellar spacing of molybdenum disulfide from 0.615 nm to 0.99 nm to promote the rapid transfer of sodium ions and improve the materials Electronic conductivity. The experimental results show that the nanomaterials with wide inter-layer distances have greatly improved the rate capability and stability of energy storage of electrode materials.
"After widening the distance between layers, the resistance of lithium, sodium, magnesium and other ions in the layers can be greatly reduced, and the electrochemical performance of these nanomaterials in ion-embedded energy storage devices can be enhanced," said Professor Xu Jun. This result can be applied to lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, and supercapacitors, thereby greatly improving the performance of energy storage devices. (Reporter Wu Changfeng correspondent Zhou Hui)
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