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Graphene printing paper electrode for electrochemical detection and preparation method thereof

A graphene-printed paper and electrochemical technology, applied in the field of graphene-printed paper electrodes for electrochemical detection and their preparation, can solve problems such as defects in sensitivity and portability, and achieve convenient operability and portability and high accuracy and practical effects

Pending Publication Date: 2018-07-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing electrochemical detection instruments for heavy metals are usually connected to three electrodes through an electrochemical workstation, and the electrodes generally use column electrodes, which have defects in detection sensitivity and portability. Therefore, a set of electrochemical testing principles is developed. It is imperative to realize rapid, sensitive and accurate on-site detection of various heavy metal ions including lead (Pd2+), cadmium (Cd2+), and copper (Cu2+) in complex water bodies with new electrodes

Method used

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  • Graphene printing paper electrode for electrochemical detection and preparation method thereof
  • Graphene printing paper electrode for electrochemical detection and preparation method thereof

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Embodiment 1

[0042] A preparation method of graphene oxide, using chemical oxidation-ultrasonic stripping-chemical reduction method to prepare graphene oxide, and studying the influence of reaction conditions on the quality of synthesized graphene oxide. : We combine some technical improvements on the basis of the Hummers method to prepare graphene oxide. Preparation method The reaction can be divided into three stages, namely: low temperature stage (the temperature is kept in the range of 10~15°C), medium temperature stage (the temperature is kept in the range of 32~38°C) and high temperature stage (the temperature is kept in the range of 98 ℃). Specific steps are as follows:

[0043] Low-temperature stage: First, 230 ml of concentrated sulfuric acid was carefully added to a 2-liter round-bottomed flask, and the round-bottomed flask was cooled to 0° C. in an ice-water bath. A mixture of 10 grams of natural graphite powder and 5 grams of sodium nitrate was then added with rapid stirring. ...

Embodiment 2

[0060] A preparation method of graphene printed paper electrodes for electrochemical detection, the principle of which is to use graphene precursor material - graphene oxide (GO) nanosheets as raw materials to develop large-scale assembly of graphene macroscopic materials Relying on the unique surface functional groups and chemical properties of GO, in the presence of the chemical reducing agent dopamine and under hydrothermal conditions, the reduced GO sheets are stacked and connected to each other, and the macroscopic three-dimensional porous structure is constructed with GO nanosheets as structural units. graphene assemblies. The three-dimensional porous graphene assembly not only inherits the excellent properties of two-dimensional graphene nanomaterials such as high electrical conductivity, chemical / thermal stability, and mechanical strength, but also endows it with a unique micro-nanoporous structure and macroscopic structure through its three-dimensional assembly process...

Embodiment 3

[0070] see figure 1 , a graphene test paper electrode for electrochemical detection, which includes a PET substrate 1 (polyester film) and a working electrode 2 printed on it by a printing process, a counter electrode 3, a reference electrode 4, a silver conductive baseline 5 and Insulation layer 6; working electrode 2 is printed graphene, counter electrode 3 is printed carbon, and reference electrode 4 is printed silver / silver chloride; working electrode 2 is located in the center of PET substrate 1, and counter electrode 3 and reference electrode 4 are separated by Located on the periphery of the working electrode and the three are not in contact with each other, the working electrode 2, the counter electrode 3 and the reference electrode 4 are respectively externally connected to the silver conductive baseline 5; the insulating layer 6 surrounds the periphery of the counter electrode 3 and the reference electrode 4 and makes it The working area is formed inside; the insulat...

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Abstract

The invention discloses a graphene printing paper electrode for electrochemical detection and a preparation method thereof. The graphene printing paper electrode comprises a PET (Polyethylene Terephthalate) substrate, and a working electrode, a counter electrode, a reference electrode, a silver conducting baseline and an insulating layer which are printed on the substrate by virtue of a printing process; the working electrode is printed graphene; the counter electrode is printed carbon; the reference electrode is printed silver / silver chloride; a bismuth film layer is deposited on the surfaceof the working electrode. The content of heavy metal ions in a lake water sample is tested by adopting the graphene printing paper electrode and a matched electrochemical workstation, and due to 10 times of repeated tests, the recovery rate is 92%, the RSD (Relative Standard Deviation) is less than 5%, and the testing time is less than 15 minutes; the detection limit is less than 1 umol / L; compared with an atomic absorption method, the relative deviation is less than 5%. Therefore, the graphene printing paper electrode in the invention and an electrochemical analyzer have high accuracy and practicality.

Description

technical field [0001] The invention relates to the technical field of detection instruments, in particular to a graphene printed paper electrode for electrochemical detection and a preparation method thereof. Background technique [0002] Due to the congenital deficiencies in equipment, cost, measurement cycle, sensitivity, etc. when the traditional method is applied in the field of environmental detection, the traditional method is greatly limited in this field. Therefore, people are looking for various methods to replace and develop traditional chemical and physical measurement methods. Electrochemical sensors have gained great popularity due to their traditional advantages in high sensitivity, short measurement period, and high reliability. For decades, it has become a research hotspot in the field of environmental detection and has been widely used. At present, the commonly used detection methods for heavy metal ions include atomic emission spectrometry (AES), atomic a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30
CPCG01N27/30
Inventor 韩卓王巧凤孟照瑜陈洁
Owner CHINA PETROLEUM & CHEM CORP