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Go-Nafion composite film Ag/AgCl reference electrode for ocean exploration and preparation method thereof

A reference electrode and composite membrane technology, applied in the field of electrochemistry, can solve the problems of poor resistance to seawater interference, poor pressure resistance, and low life, and achieve the effects of improved mechanical strength, excellent performance, and good mechanical properties

Active Publication Date: 2017-04-26
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned technical problems in the prior art, the invention provides a kind of Go-Nafion composite membrane Ag / AgCl reference electrode and preparation method for ocean exploration, described this ocean exploration uses Go-Nafion composite membrane Ag / AgCl The reference electrode and its preparation method should solve the technical problems that the Ag / AgCl reference electrode in the prior art has poor pressure resistance, poor resistance to seawater interference ions, and low service life, and cannot be well applied in seawater.

Method used

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  • Go-Nafion composite film Ag/AgCl reference electrode for ocean exploration and preparation method thereof
  • Go-Nafion composite film Ag/AgCl reference electrode for ocean exploration and preparation method thereof
  • Go-Nafion composite film Ag/AgCl reference electrode for ocean exploration and preparation method thereof

Examples

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Embodiment 1

[0029] 1) Preparation of bare Ag / AgCl electrode: Cut a piece of silver wire with Φ=0.5mm and L=25mm, ultrasonically clean it in 1.6M HCl, acetone and ultrapure water for 20 minutes, weld a piece of platinum wire to draw ohmic potential, The silk was immersed in 0.2M HCl solution with a current density of 0.5mA / cm 2 Anodized silver wire, a layer of gray-black silver chloride layer is grown on the silver substrate;

[0030] 2) Preparation of the composite film Ag / AgCl electrode: Take the electrode prepared in (1) and keep it at 400°C for 1.5h at a heating rate of 2°C / min, with 0.5mg / L Go and 30wt% Nafion at a volume ratio of 20: 1 The Go-Nafion composite solution configured in 1 electrophoretically deposits Go-Nafion on the electrode surface, the deposition time is 30s, and the heating rate is 2°C / min in the atmosphere furnace, N 2 After being treated at 300°C for 2 hours in the atmosphere, it was activated in 3.5wt% NaCl solution for 4 hours and packaged to obtain an all-solid...

Embodiment 2

[0032] 1) Preparation of bare Ag / AgCl electrode: cut a piece of Φ=0.64mm, L=20mm silver wire, ultrasonically clean it in 1.6M HCl, acetone and ultrapure water for 30min respectively, weld a piece of platinum wire to draw ohmic potential, and connect the silver wire Immerse in 0.1M HCl solution, with a current density of 0.9mA / cm 2 Anodize the silver wire for 2 hours, and grow a layer of gray-black silver chloride layer on the silver substrate;

[0033]2) Preparation of composite film Ag / AgCl electrode: Take the electrode prepared in (1) and keep it at 300°C for 2 hours at a heating rate of 2°C / min, and use 0.33mg / L Go and 30wt% Nafion in a volume ratio of 40:1 The configured Go-Nafion composite solution was electrophoreticly deposited Go-Nafion on the electrode surface, and the deposition time was 20s; the heating rate was 2°C / min in the atmosphere furnace, and the N 2 After being treated at 300°C for 2 hours in the atmosphere, it was activated in 3.5wt% NaCl solution for 6 h...

Embodiment 3

[0037] 1) Preparation of bare Ag / AgCl electrode: cut a piece of Φ=0.5mm, L=25mm silver wire, ultrasonically clean it in 1.6M HCl, acetone and ultra-pure water for 30 minutes, weld a piece of platinum wire to draw ohmic potential, and connect the silver wire Immerse in 0.5M HCl solution with a current density of 1.5mA / cm 2 Anodize the silver wire for 1.5h, and grow a layer of gray-black silver chloride layer on the silver substrate;

[0038] 2) Preparation of composite film Ag / AgCl electrode: Take the electrode prepared in (1) and keep it at 400°C for 2 hours at a heating rate of 2°C / min, and use 0.6mg / L Go and 30wt% Nafion in a volume ratio of 50:1 The configured Go-Nafion composite solution was electrophoreticly deposited Go-Nafion on the electrode surface, and the deposition time was 60s; 2 After being treated at 200°C for 3 hours in the atmosphere, it was activated in 3.5wt% NaCl solution for 8 hours and then packaged to obtain an all-solid-state reference electrode with a...

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Abstract

The invention provides a Go-Nafion composite film Ag / AgCl reference electrode for ocean exploration. A silver wire is adopted as the matrix, a segment of platinum wire is welded to one end of the silver wire, the outside of the silver wire is equipped with a silver chloride layer, and the silver chloride layer is externally provided with a layer of Go-Nafion composite film. The invention also provides a preparation method of the electrode. The method includes: growing the silver chloride layer on the surface of the silver wire matrix by anodic oxidation method, and depositing Go-Nafion on the surface of the silver chloride layer by electrophoretic deposition; conducting post-treatment on the composite film in an atmosphere furnace, finally performing activation in a NaCl solution and then conducting packaging. The Go-Nafion reference electrode prepared by the method provided by the invention has the advantages of simple structure, stable performance and no liquid junction potential. When the reference electrode is used in combination with a self-made Ir / IrOx pH electrode, the pH electrode shows good Nernst response within a test temperature range of 25-150DEG C.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and relates to an all-solid-state reference electrode for ocean exploration, in particular to a Go-Nafion composite membrane Ag / AgCl reference electrode for ocean exploration and a preparation method thereof. Background technique [0002] There are abundant resources in the ocean, which are an important support for the future survival of human beings and the sustainable development of society. However, the complex physical and chemical environment of the ocean has not been well understood by humans, especially the chemical parameters (pH value, S 2- etc.) have not been accurately calibrated, such as deep-sea and deep-sea hydrothermal systems. The Ag / AgCl electrode is currently recognized as the most ideal reference electrode for use in seawater due to its small temperature coefficient and stable performance. However, commercially available Ag / AgCl glass electrodes cannot be well applied in seawa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/36
CPCG01N27/36
Inventor 张骋薛振海王丹丹夏金峰粘洪强张晶晶文章萍张隆
Owner SHANGHAI INST OF TECH
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