Polypeptide electrode, supercapacitor prepared therefrom and preparation method thereof
An electrode and polypeptide technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of poor stability and cycle performance of electric double layer capacitors, achieve good application prospects, improve rate performance, good The effect of foldable performance
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[0041] Example 1: Preparation and characterization of polypeptide nanofibers
[0042] A solid-phase peptide synthesis method is used to synthesize peptides as electrode materials for peptide supercapacitors. The peptides are dipeptides and their molecular structure is:
[0043]
[0044] The synthesis steps include: connecting the natural amino acid phenylalanine (F) to the resin by a peptide solid-phase synthesis method, and then connecting the carboxyl end of the natural amino acid glutamic acid (E) to the amino terminal of F to connect F and E. The amino terminal of E is connected and protected by Fmoc, and then the dipeptide molecule is cut from the resin, separated and purified by high performance liquid chromatography, and lyophilized to obtain the above dipeptide. The flow of this process is as follows:
[0045]
[0046] In the above synthesis process, the equivalents of the raw materials used are: the degree of substitution of the resin: 0.54mmol / g, 1g; the equivalent of the ...
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[0051] Example 2: Preparation of polypeptide electrode
[0052] (1) Preparation of conductive substrate: select a polyethylene terephthalate (PET) film 1 with a thickness of 0.1 mm as the substrate, and sputter a layer of gold atoms on the PET film 1 with a magnetron sputtering apparatus to form a A gold film 2 with a layer thickness of about 5nm, thus making a conductive substrate for the electrode (refer to Figure 4 ). Use a multimeter to test the conductivity of the prepared conductive substrate.
[0053] (2) Formation of the polypeptide nanofiber layer 3: The gel-like polypeptide dispersion prepared in Example 1 is evenly coated on the conductive substrate, placed in a ventilated place for drying, and after the water has evaporated, it is transferred to Dewatering treatment is carried out in a vacuum drying oven at 60°C. In the above process, the polypeptide grows in the form of self-assembly on the surface of the conductive substrate to prepare a network-like polypeptide na...
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[0055] Example 3: Preparation of polypeptide supercapacitors
[0056] (1) Prepare electrolyte: add 10g of deionized water and 1g of concentrated sulfuric acid in a 50mL glass beaker (H 2 SO 4 , Analytically pure, mass fraction 98%), stir well; add 1g of polyvinyl alcohol crystals (PVA, analytically pure) to the above solution, and stir evenly; place the beaker containing the above mixed solution in a stirring water bath at 90°C In the pot, stir at a speed of 200r / min and heat preservation for 30min to obtain transparent and uniform PVA+H 2 SO 4 The electrolyte solution should be kept in a water bath at 90°C for later use.
[0057] (2) The method described in Example 2 is used to prepare a polypeptide electrode.
[0058] (3) Assembly of supercapacitor: PVA+H prepared in step (1) 2 SO 4 The electrolytic solution and the polypeptide electrode prepared in step (2) are assembled and compacted with an electric double layer capacitor, and finally a super capacitor is formed. The thickness ...
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