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A kind of carbon paste electrode and preparation method thereof

A carbon paste electrode and carbon paste technology, applied in the field of electrochemical analysis, can solve the problems of consumption of modifiers, complicated operation steps, overpotential for hydrogen evolution, etc.

Active Publication Date: 2011-12-07
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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Problems solved by technology

However, when the bismuth electrode is used as a modified electrode, the modifier will be adsorbed on the electrode surface, and the modifier will be consumed as the electrochemical reaction proceeds.
Therefore, it needs to be re-modified before each experiment, and the operation steps are cumbersome, time-consuming and labor-intensive.
The hydrogen evolution overpotential of the carbon paste electrode mixed with silicone oil and graphite powder is high, and the hydrogen evolution overpotential of the glassy carbon electrode is very low (-1.3V), so the bismuth film electrode using the glassy carbon electrode as the substrate can only detect the stripping potential is very low heavy metal ions such as lead and chromium

Method used

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  • A kind of carbon paste electrode and preparation method thereof

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[0030] The present invention also provides a method for preparing a carbon paste electrode, comprising: mixing graphite with di-n-octyl phthalate to obtain carbon paste; filling the carbon paste into an electrode shell; One end is installed inside the electrode shell and connected to the carbon paste, and the other end of the electrode lead is drawn out from the inside of the electrode shell to obtain a carbon paste electrode.

[0031] In the preparation method provided by the present invention, the graphite powder is preferably dried at first, the drying temperature is 20-40° C., and the drying time is preferably 20-30 h. The dried graphite powder is mixed with di-n-octyl phthalate, and the ratio of di-n-octyl phthalate to graphite is preferably 1 to 2: 2 to 4 by volume, more preferably 1 to 2: 2 to 3, most preferably 1:2. After mixing and grinding, a carbon paste is obtained. In the present invention, there is no special limitation on the material of the electrode shell, p...

Embodiment 1

[0041] Use CPE as the working electrode, 5ml contains 50mg L -1 Bi 3+ The 0.1M acetic acid buffer solution with pH 4.5 was used as the electroplating solution, and the BiF-CPE was prepared by plating at a constant potential of -0.5V for 4min.

[0042] With BiF-CPE as the working electrode,

[0043] Use anodic stripping voltammetry to detect different concentrations in the solution a) 10 μg L -1 , b) 40μgL -1 , c) 60 μg L -1 , d) 80 μg L -1 , e) 100 μg L -1 Stripping voltammetry curves of zinc, cadmium and lead. In 0.1mol L -1 Acetic acid buffer solution with pH 4.5 was used as the electrolyte, and was deposited at a potential of -1.4V for 240s. In 10~100μg L -1 Within the range, the concentration of zinc ions has a linear relationship with the peak current (R = 0.999); at 5 ~ 100μg L -1 Within the range, the concentration of cadmium and lead ions has a linear relationship with the peak current (R=0.999, 0.997). The lowest detection limit of zinc can reach 0.1μg L ...

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Abstract

The invention provides a carbon paste electrode. The carbon paste electrode comprises an electrode tube shell, a carbon paste filled in the electrode tube shell, and an electrode lead contacted with the carbon paste and led out from the electrode tube shell, wherein the carbon paste comprises graphite and a DNOP (di-n-octyl phthalate). The carbon paste electrode provided by the invention is low in residue current, simple in preparation method, non-toxic, easy to update the surface, low in price and wide in potential use range; the hydrogen overpotential is 200 mV higher than the carbon paste mixed by silicone oil and graphite powder and the reproducibility is good. The invention further provides a preparation method of the carbon paste electrode.

Description

technical field [0001] The invention relates to the field of electrochemical analysis, in particular to a carbon paste electrode and a preparation method thereof. Background technique [0002] Electroanalytical chemistry is a type of analytical method established on the basis of measuring the electrical response of a certain chemical system or sample. It has the advantages of being able to operate in turbid solutions, high sensitivity, easy to miniaturize, continuous operation of the electrode system, and online determination of substances. Changes and many other advantages have been widely used in recent years. However, in electroanalytical chemistry, gold electrodes, platinum electrodes, glassy carbon electrodes, and graphite electrodes are generally used as working electrodes. During use, due to the deposition of electrolytic products or the contamination of the electrode surface, the surface of these electrodes is prone to passivation. , resulting in poor reproducibilit...

Claims

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Application Information

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IPC IPC(8): G01N27/30
Inventor 徐国宝田野王建国
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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