Method for preparing cadmium telluride electrodes and application thereof
A cadmium telluride and electrode technology, which is applied in the direction of material electrochemical variables, can solve the problems of harmfulness to the human body and the environment, high industrialization cost, and complicated preparation process, and achieves the effect of low cost, low cost, and simple preparation process
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Embodiment 1
[0030] Example 1 , Preparation of CdTe / ITO (conductive glass) electrodes
[0031] Pretreatment of ITO: ITO was ultrasonicated in acetone, ethanol, and pure water for 3 min in turn, and dried under nitrogen flow; the dried ITO was controlled with insulating tape to have a working area of 1 cm 2 .
[0032] Preparation of deposition solution: 5.1304g CdSO 4 8 / 3H 2 O and 0.798g TeO 2 Add 100mL of dilute sulfuric acid solution (pH=1.5), stir magnetically until completely dissolved;
[0033] Potentiostatic deposition: with the obtained CdSO 4 -TeO 2 The mixed solution was used as electrolyte, ITO was used as working electrode, platinum wire electrode was used as counter electrode, and Ag / AgCl electrode was used as reference electrode.
[0034] figure 1 It is a schematic diagram of the pretreated ITO electrode.
[0035] figure 2 It is an illustration of the principle of CdTe deposited by constant potential.
[0036] The scanning electron microscope figure and X-ray di...
Embodiment 2
[0037] Example 2 , Electrochemical performance test of CdTe / ITO electrode
[0038] Comparison of different electrodes for detecting phenol:
[0039] Add phenol to 0.1 M phosphate buffer solution (pH=7.0) to prepare a 20 μM phenol solution. Using ITO and the CdTe / ITO electrode prepared in Example 1 as the working electrode, the platinum wire electrode as the counter electrode, and the Ag / AgCl electrode as the reference electrode, the phenol solution was scanned by cyclic voltammetry in the potential range of -0.6 to 0.6 V, A stable cyclic voltammogram is recorded.
[0040] Such as Figure 5 Shown is the cyclic voltammetry comparison of different electrodes for detecting phenol. It can be seen that there is no obvious electrochemical response on the surface of the unmodified ITO electrode, but there is an obvious reduction peak on the CdTe-modified ITO electrode. The comparison shows that CdTe / ITO has a better electrochemical response to phenol.
Embodiment 3
[0041] Example 3 , Quantitative detection of phenol
[0042] Prepare 8, 10, 20, 30, 40, 50, 60, 70, 80, 90, and 100 μM phenol solutions, respectively. The CdTe / ITO electrode prepared in Example 1 is used as the working electrode, the platinum wire electrode is used as the counter electrode, and the Ag / AgCl electrode is used as the reference electrode, and the 11 phenol solutions with different concentrations are scanned by differential pulse cyclic voltammetry, and the scanning potential range is -0.4~0.4V. Take the peak flow value of phenol at each concentration and the phenol concentration as a fitting curve.
[0043] Figure 6 Differential pulse voltammograms of different concentrations of phenol detected for CdTe / ITO, the inset is the fitting curve of peak current value and phenol concentration ( I (phenol) = -0.1163 C (phenol)-3.2196). According to the graph analysis, the linear range of CdTe / ITO to detect phenol is 8-100 μM, and the sensitivity is 0.1163μAμM -1 ...
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