Yu Xuefeng research group of Shenzhen Advanced Institute of Chinese Academy of Sciences successfully prepared three-dimensional black phosphorus supercapacitor

Recently, Yu Xuefeng, research group of Shenzhen Institute of advanced technology, Chinese Academy of Sciences, made a new breakthrough in the field of electrochemical preparation of black phosphorus and its energy storage application The related work was published in materials horizons (DOI: 10.1039 / c8mh00708j), an authoritative publication in the field of chemical materials, with the title of "synthesis of high-quality black phosphorus sponges for all solid state supercapacitor" The first co-author of this paper is Wen Min, a postdoctoral researcher of the research group, and research assistant Danni Liu The corresponding author is Yu Xuefeng, a researcher As a new two-dimensional layered material, black phosphorus has been widely used in physics, chemistry, material science and other fields in recent years Due to its large specific surface area, high carrier mobility and good mechanical strength, black phosphorus has attracted extensive attention in the field of energy storage and conversion It is generally considered to be an effective way to improve the energy storage performance of materials to construct three-dimensional structures based on two-dimensional lamellar materials However, the sensitivity of two-dimensional black phosphorus to air, water and oxidants has brought great challenges to the construction of three-dimensional black phosphorus structure Therefore, it is of great scientific significance and application prospect to study an effective method to construct a novel three-dimensional black phosphorus structure with excellent performance In this study, the research group realized the efficient and high-quality preparation of three-dimensional black phosphorus sponge by electrochemical method The preparation method is simple and fast, which can be completed in the air environment of normal temperature and pressure, and the time is only 3 minutes By designing the structure of the electrolytic cell, choosing the appropriate size of intercalation ion, counterion and electrolyte system, the researchers have overcome the problems of time-consuming, easy oxidation, easy fracture of the layer, and successfully prepared the high-quality, semi crosslinked three-dimensional black phosphorus sponge Scanning electron microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy, atomic force microscopy and theoretical simulation results show that the three-dimensional black phosphorus sponge is composed of super large, ultra-thin, non oxidized high-quality two-dimensional phosphine elements, including the existence of a single layer of phosphine elements, which are semi crosslinked together to form a three-dimensional black phosphorus sponge Based on the three-dimensional black phosphorus sponge as electrode material, researchers prepared all solid state supercapacitor, which showed excellent supercapacitor performance and stability At 10 MV / s sweep rate, the specific electric capacity of the capacitor reaches 80 f / g, which is much higher than that of the capacitor with two-dimensional black phosphorus nano sheet and block black phosphorus as electrode materials After 15000 charge and discharge cycles, the capacity only decreased by 20% The research work has been supported by the key program for frontier scientific research of the Chinese Academy of Sciences, the National Natural Science Foundation of China, the Hong Kong Research Grant fund and other projects.