Jo, Changshin Hwang, Jongkook Song, Hannah Dao, Anh Ha Kim, Yong-Tae Lee, Sang Hyup Hong, Seok Won Yoon, Songhun Lee, Jinwoo 2024-01-20T12:01:18Z 2024-01-20T12:01:18Z 2021-09-04 2013-08 1616-301X https://pubs.kist.re.kr/handle/201004/127838 An ordered mesoporous tungsten-oxide/carbon (denoted as m-WO3-x-C-s) nanocomposite is synthesized using a simple one-pot method using polystyrene-block-poly(ethylene oxide) (PS-b-PEO) as a structure-directing agent. The hydrophilic PEO block interacts with the carbon and tungsten precursors (resol polymer and WCl6), and the PS block is converted to pores after heating at 700 degrees C under a nitrogen flow. The m-WO3-x-C-s nanocomposite has a high Brunauer-Emmett-Teller (BET) surface area and hexagonally ordered pores. Because of its mesoporous structure and high intrinsic density of tungsten oxide, this material exhibits a high average volumetric capacitance and gravimetric capacitance as a pseudocapacitor electrode. In comparison with reduced mesoporous tungsten oxide (denoted as m-WO3-x-h), which is synthesized by a tedious hard template approach and further reduction in a H-2/N-2 atmosphere, m-WO3-x-C-s shows a high capacitance and enhanced rate performance, as confirmed by cyclic voltammetry, galvanostatic charge/discharge measurements, and electrochemical impedance spectroscopy. The good performance of m-WO3-x-C-s is attributed to the high surface area arising from the mesoporous structure, the large interconnected mesopores, and the low internal resistance from the well-dispersed reduced tungsten oxide and amorphous carbon composite structure. Here, the amorphous carbon acts as an electrical pathway for effective pseudocapacitor behavior of WO3-x. English WILEY-V C H VERLAG GMBH Block-Copolymer-Assisted One-Pot Synthesis of Ordered Mesoporous WO3-x/Carbon Nanocomposites as High-Rate-Performance Electrodes for Pseudocapacitors Article 10.1002/adfm.201202682 1 ADVANCED FUNCTIONAL MATERIALS, v.23, no.30, pp.3747 - 3754 ADVANCED FUNCTIONAL MATERIALS 23 30 3747 3754 N scie scopus 000327490900004 2-s2.0-84881402937 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article ELECTROCHEMICAL ENERGY-STORAGE DOUBLE-LAYER CAPACITORS IMPEDANCE SPECTROSCOPY CARBON SUPERCAPACITORS NANOWIRES NANOTUBES DESIGN mesoporous materials tungsten oxide carbon nanocomposites electrochemical capacitors