Research on graphene micro-supercapacitors has made progress.
Recently, the research team led by researcher Wu Zhongshuai from the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, has prepared continuous, uniform, and ultra-thin sulfur-doped graphene films using a bottom-up pyrolysis method, and applied them to high specific capacity micro-supercapacitors. The related research results were published in the Journal of the American Chemical Society (J. Am. Chem. Soc., DOI:10.1021/jacs.7b00805). This work has attracted the attention of Liu Zhongfan, editor-in-chief of the Acta Physico-Chimica Sinica, professor at Peking University, and academician of the Chinese Academy of Sciences, who wrote a highlight article titled "Preparation of Sulfur-Doped Graphene Films Using Bottom-Up Method for Micro-Supercapacitors" in that journal (DOI:10.3866/PKU.WHXB201703171) and provided a Highlight report.
The rapid development of highly integrated, lightweight, portable, and functionally integrated electronic devices urgently requires new energy storage devices to match them. Micro-supercapacitors have attracted attention due to their advantages of lightweight, small size, and ultra-high power density; among them, developing high-performance electrode materials is one of the important research directions for achieving high-performance micro-supercapacitors. Research has found that doping graphene with one or more heteroatoms (nitrogen, boron, sulfur) can significantly improve supercapacitor performance; however, using nano-graphene as a precursor to precisely prepare uniform thickness, large-area sulfur-doped graphene films from the bottom up still faces significant challenges.
The research team successfully prepared continuous and uniform sulfur-doped graphene films using the two-dimensional nano-confinement effect and gold catalytic action of a nano-gold thin layer, employing a stepwise bottom-up pyrolysis method; using this film as an electrode, they constructed micro-supercapacitors using micro-nano processing technology. This capacitor has advantages such as high volumetric specific capacity (582F/cm3), good cycling stability, and high power density (1191W/cm3). Mechanistic studies indicate that the presence of the nano-gold thin layer facilitates the formation of stable S-Au bonds and C-S bonds, thereby achieving a complete nano-graphene main structure, uniform doping of sulfur elements, and uniform film thickness. This work provides a new idea for the controlled preparation of large-area, continuous graphene films using the bottom-up method; it also offers a new method for sulfur-doped graphene and confirms that sulfur doping can significantly improve the electrochemical performance of graphene films.
The above work was supported by the National Natural Science Foundation, the National Key Research and Development Program, the Liaoning Provincial Natural Science Foundation, the National Young Thousand Talents Program, and other projects.
Previous Page
Previous Page
Related News