A preparation method based on two-dimensional niobium carbide nanocomposite supercapacitor
A niobium carbide nano- and supercapacitor technology, applied in the field of electrochemistry, can solve the problems of low electronic conductivity, capacitive performance and long-term cycle stability limitations, and achieve high storage capacity, flexible and adjustable components, and good rate capability Effect
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Embodiment 1
[0022] A preparation method based on a two-dimensional niobium carbide nanocomposite supercapacitor, comprising the following steps:
[0023] Step 1. The Nb 2 The AlC powder and 25-35 mL of hydrofluoric acid with a volume fraction of 35-45% were stirred and reacted at a temperature of 20-30 °C for 60-80 h, and the mixed solution after the reaction was centrifuged with deionized water and anhydrous ethanol in turn. Wash, centrifuge and wash until the pH of the supernatant is 6~7, and collect the precipitate;
[0024] Step 2: Add 25-35 mL of tetrapropylammonium hydroxide solution with a volume fraction of 20-30% to the precipitate obtained in step 1, and stir and react for 60-80 h at a temperature of 20-30 °C; The reacted solution was washed with deionized water and absolute ethanol by centrifugation; after washing, the precipitate was vacuum-dried at a temperature of 75-85 °C for 4-8 h to obtain lamellar niobium carbide Nb 2 C nanomaterials;
[0025] Step 3, take the Nb obta...
Embodiment 2
[0035] A preparation method based on a two-dimensional niobium carbide nanocomposite supercapacitor, comprising the following steps:
[0036] Step 1: Put 5 g Nb 2 The AlC powder and 30 mL of 40% HF were stirred and reacted at room temperature for 72 h, and the mixed solution after the reaction was washed with deionized water and absolute ethanol by centrifugation. The first washing time was 30 min; centrifuged and washed until the pH of the supernatant was 6-7; the precipitate was taken, 30 mL of 25% tetrapropylammonium hydroxide solution was added, and the reaction was stirred at room temperature for 72 h. Centrifugal washing with deionized water and absolute ethanol, the centrifuge speed was 3500 r / min, and each washing time was 15 min; after washing, the precipitate was dried in a vacuum drying box at 80 °C for 6 h, That is, the lamellar niobium carbide nanomaterial is obtained;
[0037] Step 2: Weigh 0.1 g Nb with an electronic analytical balance 2 C powder, then Nb 2 C ...
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