Affiliation:
1. Nano‐Electro‐Mechanical Device Laboratory School of Mechanical Engineering Yonsei University Seoul Seoul 120–749 South Korea
2. School of Mechanical Engineering Yonsei University Seoul 03722 Republic of Korea
3. Department of Physics Shivaji University Kolhapur Vidya Nagar Kolhapur Maharashtra 416004 India
Abstract
AbstractThe inferior electrical conductivity of conventional electrodes and their slow charge transport impose limitations on the electrochemical performance of supercapacitors (SCs) using those electrodes, necessitating strategies to overcome the limitations. An in situ Ag ion‐incorporated cation‐exchanged bimetallic sulfide/metal oxide heterostructure (Ag‐Co9‐xFexS8@α‐FexOy) is synthesized using a two‐step hydrothermal method. The coordination bond formation and Ag nanoparticle (NP) incorporation improve the electrical conductivity and adhesion of the heterostructure and reduce its interface resistance and volume expansion throughout the charge/discharge cycles. Density functional theory investigations indicate that the remarkable interlayer and interparticle conductivities of the heterostructure resulting from Ag doping have changed its electronic states, leading to an enhanced electrical conductivity. The optimized electrode has an excellent specific capacity (213.6 mA h g−1 at 1 A g−1) and can maintain 93.2% capacity retention with excellent Coulombic efficiency over 20 000 charge/discharge cycles. A flexible solid‐state extrinsic pseudocapacitor (EPSC) is fabricated using Ag‐Co9‐xFexS8@α‐FexOy and Ti3C2TX electrodes. The EPSC has specific and volumetric capacitances of 259 F g−1 and 2.7 F cm−3 at 0.7 A g−1, respectively, an energy density of 80.9 Wh kg−1 at 525 W kg−1, and a capacity retention of 92.8% over 5000 charge/discharge cycles.
Funder
National Research Foundation of Korea
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials
Cited by
1 articles.
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