A modified electrode for a flow battery, its preparation method, and a flow battery
A liquid flow battery and electrode technology, which is applied in the direction of battery electrodes, fuel cells, regenerative fuel cells, etc., can solve the problems of complex modification process, poor service life, and general effect of electrode materials, and achieve high-value utilization and Efficient recycling, reduced production costs, and simplified production processes
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[0026] A method for preparing a modified electrode for a flow battery, comprising the following steps:
[0027] (1) Pretreatment of waste asphalt: put waste asphalt in a hydrocarbon solvent at a ratio of 1g:10ml~100ml, heat until dissolved, and then filter out insoluble impurities to obtain a concentration of 0.01g / ml~0.1g / ml Asphalt solution, wherein the hydrocarbon solvent includes any one or several of benzene, toluene, xylene, n-hexane, and carbon tetrachloride.
[0028] Among them, 1g of waste asphalt is preferably dissolved in 30ml~60ml of solvent to form an asphalt solution with a concentration of 0.017g / ml~0.033g / ml.
[0029] In this step, the asphalt solution is selected at a concentration of 0.01g / ml~0.1g / ml, in order to control the load per unit area of the original electrode, so that the modified electrode can obtain a larger specific surface area, and the concentration of the asphalt solution is lower than 0.01g / ml. If the load is small, the modification effect...
Embodiment 1
[0037] In this embodiment, preparing a modified electrode for a flow battery includes the following steps:
[0038] (1) Pretreatment of waste asphalt: put waste asphalt in toluene solvent at a ratio of 1g:60ml, heat until dissolved, and then filter out insoluble impurities to obtain an asphalt solution with a concentration of 0.017g / ml;
[0039] (2) First test the properties of the unmodified carbon felt, in which the specific surface area is 67m 2 / g, the contact angle with water is 128°, the peak current of the cyclic voltammetry curve is 200mA, and the redox potential difference is 0.5V; Immerse in water for 20s, dry at 100°C for 3h to obtain an electrode with asphalt attached to the surface, then soak the electrode with asphalt attached to the surface for 5min in a KOH solution with a concentration of 1mol / L, and dry at 90°C for 3.5h , to obtain an electrode treated with lye;
[0040] (3) Place the lye-treated carbon felt obtained in step (2) in a tube furnace, heat it u...
Embodiment 2
[0045] The difference from Example 1 is:
[0046] Step (1) Use benzene as a solvent, and place waste asphalt in the solvent at a ratio of 1g:40ml to make an asphalt solution with a concentration of 0.025 g / ml;
[0047] Step (2) Dry at 80°C for 2 hours, and the alkaline solution is Na 2 CO 3 solution;
[0048] In this example, the pitch load is 23% of the mass of the original carbon felt, more pitch is distributed on the carbon fibers of the carbon felt, and its active sites increase, thereby enhancing its electrical conductivity. The specific surface area of felt is 93m 2 / g, the peak current of the cyclic voltammetry curve is 218mA, and the redox potential difference is 0.47V; however, the concentration of the alkaline treatment does not change due to the increase of the asphalt loading, resulting in the etching effect of the alkaline solution on the carbon felt decrease, which in turn leads to a decrease in its hydrophilicity (the contact angle between the modified car...
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