Self-assembly synthesis of AgNPs@g-C 3 N 4 composite with enhanced electrochemical properties for supercapacitors
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Research Letter
Self-assembly synthesis of AgNPs@g-C3N4 composite with enhanced electrochemical properties for supercapacitors D.F. Wang, and Y.Z. Wu, School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China X.H. Yan, School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China; Institute for Advanced Materials, Jiangsu University, Zhenjiang 212013, Jiangsu, China; Institute of Green Materials and Metallurgy, Jiangsu University, Zhenjiang 212013, Jiangsu, China J.J. Wang, Q. Wang, C. Zhou, X.X. Yuan, J.M. Pan, and X.N. Cheng, School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China Address all correspondence to Xuehua Yan at [email protected] (Received 11 November 2018; accepted 15 February 2019)
Abstract AgNPs@g-C3N4 composite was synthesized from Ag-containing sol and g-C3N4 powder by the ultrasonic-assisted self-assembly method. The composite has hierarchical pore size distributions, which will be beneficial to the ion transport with different size. Ag nanoparticles with the size of 5 nm successfully adhere on the surface of g-C3N4. The AgNPs@g-C3N4 composite has excellent specific capacitance and specific power performance for the supercapacitors as an electrode material. The specific capacitance of composite is 4 times greater than that of g-C3N4. It can be ascribed to the introduction of Ag nanoparticles that the internal resistance of the composite is significantly decreased.
Introduction As a new type of energy storage device, supercapacitors have drawn more and more attention for their considerably highpower density, high specific capacitance, and long-life cycle.[1–4] Electrode materials have a decisive influence on the electrochemical performance of supercapacitors.[5–7] Therefore, researchers are trying to discover supercapacitor electrodes materials with excellent performance to expand the application value of supercapacitors. Generally, on the basis of the energy storage mechanism, supercapacitors are divided into electrical double layer supercapacitors (EDLC) and pseudo-supercapacitors. Carbon materials have been the main active electrode materials of the electrical double layer supercapacitor, because of their low cost, facile synthesis, large specific surface area, and excellent cycle performance.[8–10] As a conjugated polymer, g-C3N4 has the graphite-like structure[11] in which the layers are stacked by van der Waals forces. Graphitic C3N4 is possible to be an EDLC electrode material for its unique structure. In addition, g-C3N4 has industrial production feasibility due to its low cost and facile synthesis.[12] As a structurally stable polymer, g-C3N4 presents remarkable thermal stability, chemical stability, and large theoretical specific surface area, which is remarkably attractive for supercapacitors. Moreover, the high N element content of g-C3N4 effectively improves its wettability. More and more efforts have been put into improving the electrochemical performance of g-C3N4 elec
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