Single chamber type BOD sensor device based on foamed plastic super nano carbon electrodes and preparation method
A technology of foam plastics and sensors, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of low catalytic performance of electrode materials, cumbersome preparation process, and high price, and achieve easy large-scale development and utilization, accurate measurement results, and preparation The effect of simple process
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[0030] The preparation method steps are as follows:
[0031] (1) Preparation of Styrofoam Super Nano Carbon: Take Styrofoam, cut into small pieces, then calcinate under nitrogen atmosphere and temperature at 150-350°C for 10-20min to obtain black powder, then Add potassium hydroxide (the ratio of foam plastic to potassium hydroxide is 1:3), stir at room temperature for 1 h, then dry at 120°C, and heat-treat the product for 2 h under nitrogen atmosphere to obtain the product;
[0032] (2) Prepare the sensor cathode: prepare the gas diffusion layer and the catalytic layer respectively, stack the two together, press them into a thin sheet with a thickness of 0.6 mm, and sinter at a constant temperature in a box-type resistance furnace at 350 ° C for 20 min. The preparation of the sensor cathode is completed;
[0033] The preparation conditions of the gas diffusion layer are as follows: uniformly disperse a certain amount of conductive silver powder in acetone, mix it with 60% PD...
Embodiment 1
[0037] Example 1: Take a piece of polystyrene foam plastic in the printer package, cut it into small pieces, and calcinate at 150°C for 10 minutes. Heat treatment temperature is 1000°C for 30 minutes, and calcined at 250°C for 15 minutes. Heat treatment temperature is 1200°C and time is 2 hours. Calcined for 20 minutes, the heat treatment temperature was 1500°C and the time was 6 hours. Three different conditions were used to prepare super nano-carbon foam plastics. The prepared super nano-carbon foam plastics were all in the form of black powder and had good electrical conductivity. The carbonization of the plastic is not complete, or excessive carbonization, so the follow-up implementation cases all use the super nano carbon foam prepared under the conditions of calcination at 250°C for 20 minutes and heat treatment at 1200°C for 3 hours. The super nano-carbon prepared by the method has good catalytic effect, simple preparation process and low price.
Embodiment 2
[0038] Embodiment 2: a kind of construction method of the fuel cell type BOD sensor based on foamed plastics super nano carbon electrode as above figure 1 As shown, the specific steps are as follows:
[0039] 1) Take 1.5g of conductive silver powder and evenly disperse it in acetone, add 3.5g of 60% PDMS emulsion therein and mix evenly, and dry in a water bath at 80°C to obtain an elastic paste mixture. Put the paste mixture on the nickel foam and press it into a gas diffusion layer with a thickness of 0.35mm
[0040] 2) Take 0.3g foam plastic super nano-carbon powder and evenly disperse it in acetone, add 0.05g60% PDMS emulsion dropwise and mix evenly therein, dry the mixture in a water bath at 80°C and put it on the nickel foam with a tablet Machine press to form a catalytic layer with a thickness of 0.35 mm.
[0041] 3) The gas diffusion layer and the catalytic layer were stacked together, pressed into a thin sheet with a thickness of 0.6mm by a tablet press, and sintered...
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