Manufacturing method for screen printing type dissolved oxygen electrode and dissolved oxygen electrode
A technology for screen printing electrodes and dissolved oxygen electrodes, which is applied in the field of electrochemistry and can solve the problems of low electrode sensitivity, difficulty in assembling dissolved oxygen electrodes, and short working life.
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Embodiment 1
[0029] figure 1 A method for making a dissolved oxygen electrode is shown, which is used to make a dissolved oxygen electrode for detecting aquaculture water, comprising the following steps:
[0030] S1, preparing silver / iron oxide nanoparticle composite;
[0031] S2. The silver / iron oxide nanoparticle composite is drop-coated on the surface of the carbon working electrode of the screen-printed electrode to make a dissolved oxygen electrode.
[0032] In this embodiment, specifically, the step S1 includes:
[0033] S11, preparing nano-silver particles;
[0034] The specific process is: use silver nitrate as a silver source, sodium borohydride as a reducing agent, 20wt% polyvinylpyrrolidone (PVP) as a surfactant, place in an incubator, and keep the temperature at 130° C. for one hour to obtain nano-silver solution of particles;
[0035] Place the prepared solution containing silver nanoparticles in a centrifuge at a speed of 1000 rpm for centrifugation for 10 minutes, then w...
Embodiment 2
[0039] This embodiment provides a dissolved oxygen electrode, such as figure 2 and image 3 As shown, a screen-printed electrode is included, and the printed electrode includes a carbon working electrode 3 covered with a silver / iron oxide nanoparticle composite 5 .
[0040] As preferably, the screen printing electrode also includes a reference electrode 4, a counter electrode 2; the counter electrode 2 and the carbon working electrode are carbon electrodes; the carbon working electrode 3, the reference electrode 4 and the counter electrode The electrodes 2 are respectively extended and connected with respective electrode contacts, and the electrode contacts 7 are silver guide rails. In this embodiment, the carbon working electrode 3 is disc-shaped, the counter electrode 2 and the reference electrode 4 are respectively arc-shaped, and the arc-shaped counter electrode 2 and the reference electrode 4 surrounds the carbon working electrode 3 without touching it. In this embodi...
Embodiment 3
[0043] This embodiment provides a calibration method for a screen-printed dissolved oxygen electrode, including:
[0044] 1), the counter electrode 2, carbon working electrode 3, and reference electrode 4 of the screen-type dissolved oxygen electrode are connected to a cyclic voltammetry scanner, and the silver / iron oxide nanoparticle composite 5 regions Completely immersed in phosphate buffer solution with pH 7.4;
[0045] 2) Inject oxygen and argon into the buffer at a constant speed at the same time, so that the ratio of oxygen / argon is maintained at 0, 0.25, 0.5, 0.75, and 1 for 10 minutes; at the same time, the cyclic voltammetry scanner Scanning rate, working potential range: -1.5V~+1.5V, repeatedly scan the screen-printed dissolved oxygen electrode over time, and record the current-potential (I-U) cyclic voltammetry curve; Figure 4 As shown, a in the figure represents the current-potential (I-U) cyclic voltammetry curve of a blank screen-printed electrode, and b, c, d...
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