Carbon Felt Surface Treatment Effect on W18O49 Nanostructure-based Supercapacitor Electrode Performance

초록

W<inf>18</inf>O<inf>49</inf> nanostructures assembled on carbon felt (WNACs) were fabricated using a simple solvothermal synthesis method. WNACs are composed of nanowire bundles with 3D structures that grow in the vertical direction of the CF. The CF was pretreated with HNO<inf>3</inf>, which increased the oxygen-containing functional groups on the surface. The pretreated and untreated CF samples showed XRD diffraction peaks in the same position, indicating that the pretreatment did not affect the crystal structure of the nanostructures grown on the CF surface. The increased oxygen-containing functional groups on the surface of CF improved the hydrophilicity of CF and the adsorption of metal ions, thus promoting the growth of uniformly distributed W<inf>18</inf>O<inf>49</inf> nanostructures on the CF surface and providing additional active sites for electrochemical reactions. Analysis of electrochemical performance revealed that the HNO<inf>3</inf>-pretreated WNAC showed enhanced performances compared with nontreated WNAC. This work contributes to the synthesis of CF-based nanostructured electrodes and application research for performance improvement. © 2023 The Korean Physical Society. All rights reserved.

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