CN113075273A - Ni/CC/Cu composite material electrode, preparation method thereof and application thereof in COD detection - Google Patents
Ni/CC/Cu composite material electrode, preparation method thereof and application thereof in COD detection Download PDFInfo
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Abstract
The utility model provides a Ni/CC Cu combined material electrode, the electrode includes basic unit, adhesion layer, shaping layer, catalysis layer, the basic unit be the nickel piece, the adhesion layer constitute by the conducting resin, shaping layer constitute by Carbon Cloth (CC), the catalysis layer be attached to micron copper on the carbon cloth. The method has the characteristics of easiness in preparation, simplicity in operation, energy conservation, environmental friendliness and the like, and the prepared Ni/CC/Cu composite material electrode has excellent electrocatalytic activity, has higher sensitivity and lower detection limit on the detection of water body COD, is accurate in numerical value, is low in manufacturing cost, and has good environmental protection and economic benefits.
Description
Technical Field
The invention belongs to the field of electrode materials, and particularly relates to a preparation method of a Ni/CC/Cu composite material and application of the Ni/CC/Cu composite material in water body COD detection.
Background
Analytical determination of organic compounds in water is critical for water quality assessment and pollution control. Chemical Oxygen Demand (COD), namely the amount of oxidant consumed when a water sample is treated by a certain strong oxidant under a certain condition, is taken as a standard for evaluating organic pollution of a water body in many countries. The COD is measured by the traditional method through oxidizing and degrading organic matters in water by using a strong oxidant such as dichromate or permanganate. However, this method has some disadvantages, such as the use of expensive reagents (e.g., Ag)2SO4) Strong corrosivity (concentrated H)2SO4) High toxicity (HgSO)4Hexavalent Cr), and the like, and in addition, has the disadvantages of long reflux process time (2-4 hours), complex experimental procedures, low sensitivity, low accuracy of experimental data, and the like. Due to the technological advances, methods for detecting COD have been improved to provide more convenient and environmentally friendly methods for COD determination, such as uv, fluorescence and chemiluminescence, which can be used in conjunction with flow injection techniques to greatly improve the efficiency of analysis, but also inevitably require toxic reagents and light sources during operation, making it difficult to make a convenient detector. In addition, the COD can be measured by a photocatalysis and photoelectrocatalysis method which utilizes illumination TiO with strong oxidation performance and environmental protection2A material. However, photo-generated electron-hole pairs are easily recombined and are environmentally demanding and inconvenient to implement.
In order to obtain a method for detecting COD more quickly and conveniently, people aim at an electrochemical analysis method, and the electrochemical detection technology of the COD is based on electro-catalysis (EC) and utilizes an electro-catalysis active electrode to realize the quick oxidation of organic matters. In many cases, it is difficult to directly oxidize organic substances in aqueous solutions using simple metal or carbon electrodes because the high potential tends to cause oxidation of water due to the high voltage required to oxidize organic substances. Therefore, the choice of the electrodes is very important.
To date, some novel electrode materials useful for detecting organic substances have been reported, such as: PbO2，AgO/CuO，Rh2O3Ti, Cu/CuO, and Boron Doped Diamond (BDD) electrodes, among others. However, they all have problems, the electrocatalytic capacity of Cu/CuO and AgO/CuO electrodes is limited, PbO2The electrodes inevitably emit toxic heavy metal Pb, and the Boron Doped Diamond (BDD) electrodes are expensive to manufacture.
Copper-based electrode materials with various structures are widely researched in COD detection. Silva et al, using Cu rods as the sensor, found that the COD linearity range was broad (53.0-2801.4 mg/L) but the detection limit was high (20.3 mg/L) despite its ability to efficiently produce CuO (OH). With Cu or Cu, in contrast to Cu rods/foils electrodesXElectrodes such as nano-Cu/Cu cable, nano-copper/Glassy Carbon Electrode (GCE) and the like prepared from O (x = 1 or 2) nano materials have higher detection sensitivity and lower detection limit, and the Cu/CuO nano materials have larger specific surface area and therefore have higher electrocatalytic performance. However, due to the property of nanomaterials to easily agglomerate, achieving uniform loading of nanocopper on the electrode remains a challenge; moreover, the electrode cost of the method is high, and the method is not suitable for popularization.
Disclosure of Invention
In order to solve the technical problem, the invention provides a Ni/CC/Cu composite material electrode.
The technical scheme of the invention is as follows: the utility model provides a Ni/CC Cu combined material electrode, the electrode is including basic unit, adhesion layer, shaping layer, the catalysis layer of laminating in proper order, the basic unit be the nickel piece, the adhesion layer constitute by the conducting resin, shaping layer constitute by the carbon cloth, the catalysis layer constitute by adhering to micron copper on the carbon cloth, micron copper be the flower form cluster body.
According to the technical scheme, the composite material formed by bonding the nickel sheet and the carbon cloth through the conductive adhesive is used as the substrate, then the nano copper ions are deposited on the carbon cloth through a constant voltage method, the deposition process can be completed within 1-10 min, the deposition process is short, the deposited copper only reaches the surface of the microstructure of the carbon cloth and is not long enough for the deposition of the copper simple substance, the surface area of the copper simple substance of the electrode catalyst layer is increased, and the sensitivity during detection is improved; the catalytic layer is subjected to amplification observation, and a flower-shaped cluster body formed by copper micro-sheets with the thickness of less than 1 mu m is loaded on the surface of the CC, wherein in the invention, the flower-shaped cluster body refers to a microstructure which is deposited on the surface of the carbon cloth and has a certain thickness and size and formed by simple substance copper, and the diameter of the cluster body is about 30-40 mu m; in addition, the materials in the invention are simple and easy to obtain, and the manufacturing cost is low.
Preferably, the carbon cloth is formed by staggering carbon fibers with the diameter of 2-3 mu m.
Another object of the present invention is to provide a method for preparing the above electrode.
A preparation method of a Ni/CC/Cu composite material electrode comprises the following steps:
a. taking a nickel sheet, brushing a layer of conductive adhesive on one surface of the nickel sheet, and attaching a piece of carbon cloth; then, a flexible polyimide film is attached to the other surface of the nickel sheet to obtain a composite nickel plate;
b. and (2) sticking the composite nickel plate serving as a substrate in an electrodeposition tank in a mode that the film surface faces downwards, connecting the composite nickel plate with a negative electrode of a power supply, connecting an inert electrode with a positive electrode of the power supply, performing electrodeposition for 60-600 s at a voltage of-0.3 to-0.7V by using a mixed solution consisting of copper sulfate, sulfuric acid and hexadecyl trimethyl ammonium bromide as an electrodeposition solution, and rinsing to obtain the Ni/CC/Cu composite material electrode.
Preferably, the concentration of copper sulfate in the mixed solution in the step b is 0.5-0.8 mol/L, the large concentration of copper sulfate causes the accumulation of copper simple substances on the surface to reduce the surface area, and the small concentration of copper sulfate causes incomplete coverage, so that both the copper sulfate and the copper sulfate cause the reduction of the detection efficiency, the concentration of sulfuric acid is 0.5-0.8 mol/L, the concentration of cetyl trimethyl ammonium bromide is 2-3 mmol/L, and the addition of the surfactant cetyl trimethyl ammonium bromide can reduce the surface tension of the carbon cloth, so that the precipitated copper is more easily loaded on the carbon cloth.
Preferably, all chemical reagents are analytically pure or guaranteed purity.
Preferably, the step b is carried out at 16-25 ℃.
Still another object of the present invention is to provide an application of the above electrode in COD detection.
The use method of the Ni/CC/Cu composite material electrode in the detection of the chemical oxygen demand of the water body comprises the steps of taking the prepared Ni/CC/Cu composite material electrode as a working electrode, adopting a standard three-electrode system for detection, and using organic matters to construct a calibration curve between the chemical oxygen demand and the current. And obtaining the chemical oxygen demand of the water body by detecting the current value of the water body. In the technical scheme, a certain amount of organic matters are weighed firstly to prepare a solution with a certain concentration, then a series of organic matter solutions with gradient concentrations are obtained through dilution, the obtained organic matter solutions are inserted into a standard three-electrode system with the prepared Ni/CC/Cu composite material electrode as a working electrode, the standard three-electrode system is connected with an electrochemical workstation to carry out electrocatalytic oxidation electrolysis, after the standard three-electrode system works for 60s, a circuit system reaches balance, data of an ammeter is recorded, and a standard curve of the organic matter concentration and the current is obtained; and obtaining the chemical oxygen demand of the water body by detecting the current value of the water body.
According to the detection method provided by the technical scheme, only the electrocatalytic oxidation electrolysis current of the water body to be detected needs to be detected, and the COD of the water body can be obtained by contrasting the working curve of the electrode, so that the detection is convenient and the sensitivity is higher compared with the existing potassium dichromate method; in actual measurement, if the organic matter components in the water body are too much, the electrocatalytic activity of the electrode surface can be enhanced by adding a certain amount of sodium hydroxide into the water body to be measured, and a magnetic stirrer is used for stirring to ensure that the electrolyte is uniformly distributed. And obtaining an I-t curve of the current through the electrochemical workstation, comparing the I-t curve with a reference current I-t curve obtained by using a pure sodium hydroxide solution to obtain an Δ I, and obtaining the chemical oxygen demand of a real water sample. Preferably, when a platinum sheet is used as an auxiliary electrode and silver/silver chloride and saturated KCl are used as reference electrodes, the operating voltage ranges of the test are as follows: 0.5-0.8V.
Preferably, the organic substance used to construct the calibration curve between chemical oxygen demand and current is selected from one or more of fructose, glycine, glucose, maltose, ascorbic acid and sucrose.
In conclusion, the beneficial effects of the invention are as follows:
1. the invention adopts copper (Cu) as a multifunctional and environment-friendly electrode material to manufacture the electrode, and the electrode can be based on Cu (OH) in an alkaline medium2a/CuO (OH) redox couple useful as an electrocatalysis for the oxidation of a variety of organic species;
2. the invention adopts the electrodeposition method to deposit the nano-copper on the surface of the carbon cloth, the external surface area of the copper is large, and the sensitivity of the electrode is high;
3. the electrode of the invention has simple structure, low cost and easy preparation; the method is convenient and safe to apply to detection and has a wide application prospect.
Drawings
FIG. 1 is an XRD diagram of several materials of Ni foil, CC, Ni/CC/Cu;
FIG. 2 is a diagram of a Ni/CC/Cu composite electrode SCM provided in example 1;
FIG. 3 is an AFM image of a Ni/CC/Cu composite electrode provided in example 1;
FIG. 4 is a standard curve of example 1;
FIG. 5 is a standard curve chart of example 2;
FIG. 6 is a standard curve chart of example 3;
FIG. 7 is a standard curve chart of example 4;
FIG. 8 is a graph showing a comparison between a comparative example and example 1.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The invention is further illustrated by the following examples, without restricting its scope to these examples.
Example 1
Referring to fig. 1 to 3, the Ni/CC/Cu composite electrode is prepared by the method, and comprises a base layer, an adhesion layer, a shaping layer and a catalyst layer which are sequentially attached, wherein the base layer is a nickel sheet, the adhesion layer is made of conductive adhesive, the shaping layer is made of carbon cloth, the catalyst layer is made of nano copper attached to the carbon cloth, the nano copper forms flower-shaped clusters, the diameters of the flower-shaped clusters are 30 to 40 μm, and the carbon cloth is made of carbon fibers with the diameters of 2 to 3 μm.
The preparation method of the Ni/CC/Cu composite material electrode comprises the following steps:
a. taking a nickel sheet, brushing a layer of conductive adhesive on the upper surface of the nickel sheet, and attaching a piece of carbon cloth with the same area; then, a flexible polyimide film with the same area is attached to the lower surface of the nickel sheet;
b. b, at room temperature, sticking the film-stuck composite nickel plate obtained in the step a as a substrate in an electrolytic tank in a mode that the film surface faces downwards, connecting the composite nickel plate with a power supply cathode, connecting an inert electrode with a power supply anode, and electrodepositing a nano copper film for 100s under the voltage of-0.5V by taking a mixed solution consisting of copper sulfate, sulfuric acid and hexadecyl trimethyl ammonium bromide as an electrodeposition solution;
c. and (c) rinsing the product obtained in the step (b) with distilled water for 2 times to obtain the Ni/CC/Cu composite material electrode.
The concentration of copper sulfate in the mixed solution in the step b is about 0.5mol/L, the concentration of sulfuric acid is 0.5mol/L, and the concentration of hexadecyl trimethyl ammonium bromide is 2 mmol/L; and all chemical reagents are analytically pure or guaranteed grade pure.
The Ni/CC/Cu composite material electrode is used in the detection of the chemical oxygen demand of the water body, the prepared Ni/CC/Cu composite material electrode is used as a working electrode, a standard three-electrode system is adopted for detection, and an organic matter is used for constructing a calibration curve between the chemical oxygen demand and the current. And obtaining the chemical oxygen demand of the water body by detecting the current value of the water body. The specific operation is as follows: 540mg of glucose is weighed firstly to prepare a glucose solution with the concentration of 3mmol/L, then obtaining a series of glucose solutions (which can obtain COD of a sample water body after conversion) with gradient concentrations (0.125 mmol/L, 0.25mmol/L, 0.375 mmol/L, 0.5 mmol/L, 0.75 mmol/L, 1 mmol/L, 1.25 mmol/L, 1.5 mmol/L, 2mmol/L and 2.5 mmol/L) by dilution, inserting the prepared Ni/CC/Cu composite material electrode as a working electrode, a platinum sheet is taken as an auxiliary electrode, silver/silver chloride and saturated KCl are taken as reference electrodes, a power supply and an ammeter are connected, performing electrocatalytic oxidation electrolysis under the voltage of 0.8V, after working for 60s, balancing a circuit system, and recording data of an ammeter, thereby obtaining a standard curve of COD and current (as shown in FIG. 4); and obtaining the chemical oxygen demand of the water body by detecting the current value of the water body.
Example 2
The Ni/CC/Cu composite material electrode is prepared by the method and comprises a base layer, an adhesion layer, a shaping layer and a catalyst layer which are sequentially attached, wherein the base layer is a nickel sheet, the adhesion layer is composed of conductive adhesive, the shaping layer is composed of carbon cloth, the catalyst layer is composed of nano copper attached to the carbon cloth, the nano copper forms flower-shaped clusters, the diameter of each flower-shaped cluster is 30-40 micrometers, and the carbon cloth is composed of carbon fibers of 2-3 micrometers.
A preparation method of a Ni/CC/Cu composite material electrode comprises the following steps:
a. taking a nickel sheet, brushing a layer of conductive adhesive on the upper surface of the nickel sheet, and attaching a piece of carbon cloth with the same area; then, a flexible polyimide film with the same area is attached to the lower surface of the nickel sheet;
b. b, at room temperature, sticking the film-stuck composite nickel plate obtained in the step a as a substrate in an electrolytic tank in a mode that the film surface faces downwards, connecting the composite nickel plate with a power supply cathode, connecting an inert electrode with a power supply anode, and electrodepositing a nano copper film for 300 s under the voltage of-0.6V by taking a mixed solution consisting of copper sulfate, sulfuric acid and hexadecyl trimethyl ammonium bromide as an electrodeposition solution;
c. and (c) rinsing the product obtained in the step (b) with distilled water for 2 times to obtain the Ni/CC/Cu composite material electrode.
The concentration of copper sulfate in the mixed solution in the step b is about 1mol/L, the concentration of sulfuric acid is 0.5mol/L, and the concentration of hexadecyl trimethyl ammonium bromide is 2 mmol/L; and all chemical reagents are analytically pure or guaranteed grade pure.
The Ni/CC/Cu composite material electrode is applied to the detection of the chemical oxygen demand of the water body, the prepared Ni/CC/Cu composite material electrode is used as a working electrode, a standard three-electrode system is adopted for detection, and an organic matter is used for constructing a calibration curve between the chemical oxygen demand and the current (as shown in figure 5). And obtaining the chemical oxygen demand of the water body by detecting the current value of the water body. A platinum sheet is used as an auxiliary electrode, silver/silver chloride and saturated KCl are used as reference electrodes, and the tested working voltage range is as follows: 0.8V.
The organic material used to construct the calibration curve between chemical oxygen demand and current was glucose.
Example 3
The Ni/CC/Cu composite material electrode is prepared by the method and comprises a base layer, an adhesion layer, a shaping layer and a catalyst layer which are sequentially attached, wherein the base layer is a nickel sheet, the adhesion layer is composed of conductive adhesive, the shaping layer is composed of carbon cloth, the catalyst layer is composed of nano copper attached to the carbon cloth, the nano copper forms flower-shaped clusters, the diameter of each flower-shaped cluster is 30-40 micrometers, and the carbon cloth is composed of carbon fibers of 2-3 micrometers.
The preparation method of the Ni/CC/Cu composite material electrode comprises the following steps:
a. taking a nickel sheet, brushing a layer of conductive adhesive on the upper surface of the nickel sheet, and attaching a piece of carbon cloth with the same area; then, a flexible polyimide film with the same area is attached to the lower surface of the nickel sheet;
b. b, at room temperature, placing the film-coated composite nickel plate obtained in the step a in an electrolytic tank in a mode that the film surface faces downwards as a substrate, connecting the composite nickel plate with a power supply cathode, connecting an inert electrode with a power supply anode, and electrodepositing a nano copper film for 400 s under the voltage of-0.7V by using a mixed solution composed of copper sulfate, sulfuric acid and cetyltrimethylammonium bromide as an electrodeposition solution;
c. and (c) rinsing the product obtained in the step (b) with distilled water for 2 times to obtain the Ni/CC/Cu composite material electrode.
The concentration of copper sulfate in the mixed solution in the step b is about 0.5mol/L, the concentration of sulfuric acid is 0.5mol/L, and the concentration of hexadecyl trimethyl ammonium bromide is 2 mmol/L; and all chemical reagents are analytically pure or guaranteed grade pure.
The Ni/CC/Cu composite material electrode is applied to the detection of the chemical oxygen demand of the water body, the prepared Ni/CC/Cu composite material electrode is used as a working electrode, a standard three-electrode system is adopted for detection, and an organic matter is used for constructing a calibration curve between the chemical oxygen demand and the current (as shown in figure 6). And obtaining the chemical oxygen demand of the water body by detecting the current value of the water body. A platinum sheet is used as an auxiliary electrode, silver/silver chloride and saturated KCl are used as reference electrodes, and the tested working voltage range is as follows: 0.8V. The organic material used to construct the calibration curve between chemical oxygen demand and current was glucose.
Example 4
The Ni/CC/Cu composite material electrode is prepared by the method and comprises a base layer, an adhesion layer, a shaping layer and a catalyst layer which are sequentially attached, wherein the base layer is a nickel sheet, the adhesion layer is composed of conductive adhesive, the shaping layer is composed of carbon cloth, the catalyst layer is composed of nano copper attached to the carbon cloth, the nano copper forms flower-shaped clusters, the diameter of each flower-shaped cluster is 30-40 micrometers, and the carbon cloth is composed of carbon fibers of 2-3 micrometers.
A preparation method of a Ni/CC/Cu composite material electrode comprises the following steps:
a. taking a nickel sheet, brushing a layer of conductive adhesive on the upper surface of the nickel sheet, and attaching a piece of carbon cloth with the same area; then, a flexible polyimide film with the same area is attached to the lower surface of the nickel sheet;
b. b, at room temperature, placing the film-coated composite nickel plate obtained in the step a in an electrolytic tank in a mode that the film surface faces downwards as a substrate, connecting the composite nickel plate with a power supply cathode, connecting an inert electrode with a power supply anode, and electrodepositing a nano copper film for 500 s under the voltage of-0.7V by using a mixed solution composed of copper sulfate, sulfuric acid and cetyltrimethyl ammonium bromide as an electrodeposition solution; and (c) rinsing the product obtained in the step (b) with distilled water for 2 times to obtain the Ni/CC/Cu composite material electrode.
The concentration of copper sulfate in the mixed solution in the step b is about 0.5mol/L, the concentration of sulfuric acid is 0.5mol/L, and the concentration of hexadecyl trimethyl ammonium bromide is 2 mmol/L; and all chemical reagents are analytically pure or guaranteed grade pure.
The Ni/CC/Cu composite material electrode is applied to the detection of the chemical oxygen demand of the water body, the prepared Ni/CC/Cu composite material electrode is used as a working electrode, a standard three-electrode system is adopted for detection, and an organic matter is used for constructing a calibration curve between the chemical oxygen demand and the current (as shown in figure 7). And obtaining the chemical oxygen demand of the water body by detecting the current value of the water body. A platinum sheet is used as an auxiliary electrode, silver/silver chloride and saturated KCl are used as reference electrodes, and the tested working voltage range is as follows: 0.8V. The organic material used to construct the calibration curve between chemical oxygen demand and current was glycine.
Comparative example
A glucose solution (0.125 mmol/L, 0.25mmol/L, 0.375 mmol/L, 0.5 mmol/L, 0.75 mmol/L, 1 mmol/L, 1.25 mmol/L, 1.5 mmol/L, 2mmol/L, 2.5 mmol/L) was measured by potassium dichromate method to obtain a standard curve for comparison with example 1; further, 5 parts of glucose solution with unknown COD concentration were measured by the method of example 1 and the potassium dichromate method, respectively, and the COD data obtained by the two methods were plotted on the horizontal axis and the vertical axis, respectively (see FIG. 8).
For the above examples 1-4, the inventors tested the standard curve for each group, and the data is as follows.
Table 1, COD-current data for examples 1-4
By comparing and analyzing the standard curves shown in FIGS. 4-7, the response current I and the concentration c of the organic matter are in a linear relationship with a linear correlation coefficient R in a range of 0-385.2 mg/L2All approach to 1, and the result is accurate; carrying out 6 times of parallel tests on a blank group of 0mg/LCOD, and calculating according to a 3 sigma/S principle to obtain that the detection limit of the method is 5.62 mg/L, wherein the detection limit is low enough to be competent for most cases; the higher sensitivity of the method provided by the present invention is readily apparent from a comparison of the two in fig. 8.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A Ni/CC/Cu composite material electrode is characterized in that: the electrode is including basic unit, adhesion layer, shaping layer, the catalysis layer of laminating in proper order, the basic unit be the nickel piece, the adhesion layer constitute by the conducting resin, shaping layer constitute by the carbon cloth, the catalysis layer by adhere to micron copper on the carbon cloth constitutes, micron copper form flower form cluster body.
2. The Ni/CC/Cu composite electrode according to claim 1, wherein the flower-like clusters have a diameter of 30 to 40 μm and are composed of copper micro-sheets having a thickness of less than 1 μm.
3. The Ni/CC/Cu composite electrode of claim 1, wherein the carbon cloth is composed of carbon fibers with diameters of 2-3 μm in a staggered manner.
4. A method for preparing the Ni/CC/Cu composite material electrode of any one of claims 1 to 3, comprising the steps of:
a. taking a nickel sheet, brushing a layer of conductive adhesive on one surface of the nickel sheet, and attaching a piece of carbon cloth; then, a flexible polyimide film is attached to the other surface of the nickel sheet to obtain a composite nickel plate;
b. and (2) sticking the composite nickel plate serving as a substrate in an electrodeposition tank in a mode that the film surface faces downwards, connecting the composite nickel plate with a negative electrode of a power supply, connecting an inert electrode with a positive electrode of the power supply, performing electrodeposition for 60-600 s at a voltage of-0.3 to-0.7V by using a mixed solution consisting of copper sulfate, sulfuric acid and hexadecyl trimethyl ammonium bromide as an electrodeposition solution, and rinsing to obtain the Ni/CC/Cu composite material electrode.
5. The method for preparing a Ni/CC/Cu composite electrode according to claim 4, wherein: in the step b, the concentration of copper sulfate in the mixed solution is 0.5-0.8 mol/L, the concentration of sulfuric acid is 0.5-0.8 mol/L, and the concentration of hexadecyl trimethyl ammonium bromide is 2-3 mmol/L.
6. The method for preparing a Ni/CC/Cu composite electrode according to claim 4, wherein: all chemical reagents were either analytically pure or guaranteed purity.
7. The method for preparing a Ni/CC/Cu composite electrode according to claim 4, wherein the step b is performed at 16-25 ℃.
8. The use method of the Ni/CC/Cu composite electrode in the detection of the chemical oxygen demand of the water body, which is characterized by comprising the following steps: taking the Ni/CC/Cu composite material electrode as a working electrode, detecting by adopting a standard three-electrode system, and constructing a calibration curve between chemical oxygen demand and current by using an organic matter; and obtaining the chemical oxygen demand of the water body to be detected by detecting the current value of the water body to be detected.
9. The use method of the Ni/CC/Cu composite electrode in the detection of the chemical oxygen demand of the water body according to claim 8, which is characterized in that: when a platinum sheet is used as an auxiliary electrode and silver/silver chloride and saturated KCl are used as reference electrodes, the working voltage range of the test is as follows: 0.5-0.8V.
10. The use method of the Ni/CC/Cu composite electrode in the detection of the chemical oxygen demand of the water body according to claim 8, which is characterized in that: the organic substance used to construct the calibration curve between chemical oxygen demand and current is selected from one or more of fructose, glycine, glucose, maltose, ascorbic acid and sucrose.
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