Temperature modulating electro-chemical electrode and its heating method

A heating method and electrochemical technology, applied in the field of electrochemistry, can solve the problem of not being able to prevent the flow of capacitive current, and achieve the effects of simplifying the structure of the device, wide application range, and good application effect

Inactive Publication Date: 2009-02-18
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this design alone does not prevent the capacitive current from flowing

Method used

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  • Temperature modulating electro-chemical electrode and its heating method
  • Temperature modulating electro-chemical electrode and its heating method
  • Temperature modulating electro-chemical electrode and its heating method

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Embodiment 1

[0030]A carbon column thermoelectrode with a diameter of 104 μm was fabricated into a temperature-modulated electrochemical electrode and used as a working electrode. The electrode potential method was used to characterize the relationship between the heating current and the electrode temperature. The reference electrode is a saturated calomel electrode (SCE), the counter electrode is a platinum electrode, and the working electrode is heated by a 100KHz sine wave alternating current. The temperature modulation voltage is investigated by cyclic voltammetry in an electrochemical analyzer CHI440 (Shanghai Chenhua Instrument Co., Ltd.) Chemical electrode at 5mM K 3 Fe(CN) 6 The response to potassium ferricyanide in the +0.1M KCl system, the results of the investigation are as follows Figure 5 Shown, the experimental results and the response of the symmetrical structure design thermode to potassium ferricyanide ( Figure 4 ) For comparison, it can be seen from the figure that as heatin...

Embodiment 2

[0032] A carbon column thermoelectrode with a diameter of 150 μm was fabricated into a temperature-modulated electrochemical electrode and used as a working electrode. The electrode potential method was used to characterize the relationship between the heating current and the electrode temperature. The reference electrode is a saturated calomel electrode (SCE), the counter electrode is a platinum electrode, and the working electrode is heated by two DC power supplies connected in series. The heating method is as follows: image 3 As shown, the measurement connector is connected to the middle position between the two DC power supplies. The electrochemical analyzer CHI440 (Shanghai Chenhua Instrument Co., Ltd.) uses cyclic voltammetry to investigate the temperature-modulated electrochemical electrode at 5mM K 3 Fe(CN) 6 The response to potassium ferricyanide in +0.1M KCl system. As the applied heating current increases, the surface temperature of the temperature-modulated electroche...

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Abstract

The invention provides a temperature modulation electrochemical electrode and a heating method thereof; the electrode is composed of a power supply which can be an AC power or a DC power supply, a transformer, a measurement connector, a working electrode and a metal wire; the working electrode is processed with rapid temperature modulation through AC or DC; the temperature modulation electrochemical electrode keeps the advantages of the original thermal electrode in quickly and easily controlling the electrode temperature, improving the mass transfer rate of the system, increasing the detection sensitivity, lowering the detection limit and removing the pollutants on the electrode surface. Moreover, compared with the symmetrical structural design of the original thermal electrode, the invention simplifies the structure and can effectively eliminate the interference on electrochemical detection caused by the heating of current, so that the heating and the detection can be carried out atthe same time to achieve a better application effect; besides, the invention provides a plurality of practical and new thermal electrode materials, and has a wider application range.

Description

Technical field [0001] The invention belongs to the field of electrochemistry, relates to the production and application of electrochemical sensors, and more particularly relates to a temperature-modulated electrochemical electrode and a heating method. Background technique [0002] The thermoelectrode has been developed into an analytical testing tool by the German scientist Gründler in the past ten years. The main principle of this method is to use high-frequency alternating current to heat the working electrode while performing conventional electrochemical detection. This method can directly control the temperature of the electrode by adjusting the heating current. Since only the working electrode is heated, the electrode temperature can be kept above the boiling point for a long period of time while the overall solution temperature remains constant. The application range of the thermoelectrode ranges from the detection of heavy metals to the electrochemical analysis of organi...

Claims

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Application Information

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IPC IPC(8): G01N27/30
Inventor 孙建军张文昌林志彬陈国南
Owner FUZHOU UNIV
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