Nanofiber electrodes and supercapacitors

A nanofiber and electrode technology, which is applied in the field of synthetic self-supporting flexible electrodes, can solve problems such as nanofiber cracking and composite electrodes not showing flexibility, and achieve the effects of reducing production costs, improving area specific capacitance, and reducing reduction

Active Publication Date: 2020-06-23
NANYANG TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the produced composite electrodes did not exhibit flexibility and suffered from cracking of the nanofibers

Method used

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  • Nanofiber electrodes and supercapacitors
  • Nanofiber electrodes and supercapacitors
  • Nanofiber electrodes and supercapacitors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0126] Example 1: V 0.07 Mo 0.93 o 3 nH 2 O Polymerization of nanofiber paper

[0127] Polypyrrole-V 0.07 Mo 0.93 o 3 nH 2 The fabrication process of O nanofiber mixed paper (Ppy-VM NHP) electrode is as follows: figure 1 shown.

[0128] First, after using as reaction solvent H 2 o 2 In solution, V was synthesized under hydrothermal conditions 0.07 Mo 0.93 o 3 nH 2 O nanofibers. The resulting solution was then subjected to vacuum filtration (Whatman filter paper) to obtain V 0.07 Mo 0.93 o 3 nH 2 O nanofiber paper (VM NP). The filtration process or system is a vertical filtration flow system in which filter bottles with barbed side arms are used. A filter membrane is placed on top of the bottle. A vacuum pump is then attached to the side arm, and the solution is filtered through the membrane to obtain nanofiber paper. Soak the produced VMNP electrode in HNO 3 medium (to completely oxidize the nanofibers) and dry at room temperature. Although the as-prepa...

Embodiment 2

[0130] Example 2: MoO doped with 10 wt% vanadium 3 Nanofiber paper (V 0.07 Mo 0.93 o 3 nH 2 O nanofiber paper)

[0131] Before and after providing polypyrrole, V 0.07 Mo 0.93 o 3 nH 2 The transverse and cross-sectional views of field emission scanning electron microscopy (FESEM) micrographs of O nanofibrous paper are shown in Figures 3A to 3D middle. Figure 3A The wrinkling and bending features associated with nanofiber paper are shown. This is similar to the curved surface obtained by conventional reduced graphene oxide self-supporting paper. To facilitate the interaction of electrolyte ions with the electrode material surface, the presence of wrinkled or wavy features is required. Even after the polymerization of the pyrrole monomer, it was found that the surface of the nanofiber paper did not change, as Figure 3B shown. Cross-sectional FESEM analysis showed that by V 0.07 Mo 0.93 o 3 nH 2 Self-supporting flexible paper electrodes made of O nanofibers com...

Embodiment 3

[0133] Example 3: Mechanical flexibility of Ppy-VM NHPs

[0134] To examine the mechanical properties of Ppy-VM NHP electrodes, their Young's modulus and tensile strength were analyzed by dynamic mechanical analysis (DMA), as Figure 4 shown. Examining the behavior of the Ppy-VM NHP electrode under tensile stress by stress / strain curves (see also Figure 4 ). In the stress / strain curves, the mechanical response (stress / strain) of VM NP and Ppy-VM NHP electrodes can be divided into three parts, namely the initial loading state (E I - volumetric deformation region, represented by points at / close to the beginning of the curve), straightening state (E s - rearrangement region, without any points) and linear elastic state (E E – Regions of bond breakage and deformation, represented by points near / towards the end of the curve).

[0135] In the initial loading state, the Young's modulus of Ppy-VM NHP was found to be lower than that of VM NP, which indicated that the ease of defo...

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Abstract

According to the present disclosure, a method for synthesizing a free-standing flexible electrode is provided. The method includes the steps of mixing a solution comprising vanadium powder, molybdenum powder and hydrogen peroxide to form a mixture comprising nanofibers represented by the formula of V0.07Mo0.93O3nH2O, filtering the mixture to form an electrode comprising the nanofibers, treating the electrode with an acidic solution, contacting the acid-treated electrode with a solution comprising monomers of a conductive polymer, and polymerizing the monomers in a medium comprising an oxidizing agent to form the conductive polymer. According to the present disclosure, there is also a free-standing flexible electrode comprising nanofibers comprised of molybdenum, vanadium and a conductive polymer, wherein the electrode is represented by a formula of X—V0.07Mo0.93O3n-H2O. In this formula, X is the conductive polymer and n is independently 1 or 2. According to the present disclosure, storage devices comprising the electrode as defined above, are also provided.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Singapore Patent Application No. 10201504975T filed on 23 June 2015, the entire contents of which are hereby incorporated by reference for all purposes. technical field [0003] The present invention relates to a method for synthesizing self-supporting flexible electrodes. The invention also relates to electrodes produced according to the methods described herein. Background technique [0004] In recent years, great efforts have been made to fabricate flexible planar electrodes for supercapacitors to meet the emerging modern electronics industry and its demands. [0005] The feasibility of carbon-based materials and their derivatives as flexible and self-supporting electrode materials has been extensively investigated. For example, carbon nanotubes (CNTs) have been introduced to form self-supporting and flexible electrode materials. However, these carbon nanotubes tend to disper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/042C01G31/02C01G39/02
CPCC01G39/02C01P2002/50C01P2002/54C01P2002/72C01P2002/82C01P2004/16H01G9/042H01G11/24H01G11/30H01G11/86Y02E60/13C01G31/02C08L45/00C08L79/02C08L2203/20H01G11/36
Inventor 威坪·库马尔李佩诗
Owner NANYANG TECH UNIV
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