The low-dimensional materials and chemical energy storage research group of the Lanzhou Institute of Chemical Physics, Clean Energy Chemistry and Materials Laboratory, Chinese Academy of Sciences has made new progress in the application of graphene quantum dots in supercapacitors. The research work has been published in the recently published Adv. Funt. Mater. (2013, 23, 4111-4122) and Nanoscale (2013, 5, 6053-6062).
Graphene quantum dots (Graphene quantum dots, GQDs) refer to graphene with a size less than 10 nm. In addition to having a unique quantum effect, its scale is on the nanometer scale, and it has abundant boundary defects, showing excellent dispersion properties in various solvents. The researchers deposited GQDs on the micro-gold electrode to construct a micro-supercapacitor. The results show that GQDs have excellent capacitance characteristics in aqueous systems and ionic liquid electrolytes, and their rate characteristics and frequency response characteristics are by far the best As a result, GQDs proved to be an ideal electrode material for supercapacitors for the first time in the world. Related results were published in the latest issue of Adv. Funt. Mater. (2013, 23, 4111-4122) and were selected as the back cover article.
Based on the above work, the researchers successfully constructed two types of asymmetric capacitors on micro-electrodes using two-step electrochemical deposition method: GQDs // MnO2 and GQDs // polyaniline (PANI) micro-capacitors. Under water-based electrolysis conditions, these two types of micro-asymmetric capacitors exhibit good electrochemical performance. Finally, the researchers used a phosphoric acid-polyethylene glycol gel electrolyte to encapsulate the interdigitated gold electrode with graphene and polyaniline deposited, and successfully constructed an all-solid miniature GQDs // PANi asymmetric supercapacitor Nanoscale (2013, 5 , 6053-6062).
The successful construction of this series of GQDs-based microcapacitors provides new research ideas and methods for the application of GQDs in the field of chemical energy storage and the construction of new microsupercapacitors.
The above-mentioned research work was supported by the "Hundred Talents Program" of the Chinese Academy of Sciences and the National Natural Science Foundation of China (51005225).
Indelible Ink,Electoral Commission Ink,Silver Nitrate Ink,Purple Voting Ink
Huhua Stationary Co., Ltd , https://www.huhuastamp.com