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Birnessite type manganese dioxide nanosheet hydrogen sensor and preparation method thereof

A technology of manganese dioxide and birnessite is applied in the field of hydrogen sensors, which can solve the problems of high working temperature of the sensor, limited application range, low sensitivity, etc., and achieve the effects of low cost, stable response, and large specific surface area.

Inactive Publication Date: 2014-04-30
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such sensors have high operating temperature, low sensitivity, high power consumption, and low safety, which greatly limit their application range.

Method used

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  • Birnessite type manganese dioxide nanosheet hydrogen sensor and preparation method thereof
  • Birnessite type manganese dioxide nanosheet hydrogen sensor and preparation method thereof
  • Birnessite type manganese dioxide nanosheet hydrogen sensor and preparation method thereof

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with accompanying drawing. Such as figure 1 As shown, this embodiment discloses a birnessite-type manganese dioxide nanosheet hydrogen sensor and a preparation method thereof. The hydrogen sensor structure includes a heating resistance wire and a ceramic tube 2, and the ceramic tube 2 is set on the heating resistance wire In addition, at least a pair of electrodes 4 are symmetrically arranged on the ceramic tube 2, and the electrodes 4 are provided with wires, and the wires are located in the ceramic tube 2, and the electrodes 4 and the ceramic tube 2 are coated with a gas-sensitive material layer, the gas-sensitive material layer is manganese dioxide nanosheet 3, so that a circuit is formed between the two electrodes 4 on the ceramic tube 2, the heating resistance wire is a Ni-Cr heating resistance wire 1, and the wire is a Pt wire wire 5.

[0029] Birnessite-type manganese dioxide nanosheet hydroge...

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Abstract

The invention discloses a birnessite type manganese dioxide nanosheet hydrogen sensor and a preparation method thereof. The preparation method comprises the following steps: (1) preparing birnessite type manganese dioxide; (2) preparing an indirectly-heated hydrogen-sensitive element; (3) respectively welding a conducting wire and a resistive heater onto a sensor base to manufacture an indirectly-heated hydrogen sensor. According to the invention, a manganese acetate solution and a sodium peroxide solution are used as raw materials and a direct-oxidation coprecipitation technique is adopted to prepare a birnessite type manganese dioxide nanosheet which has the advantages of large specific area, high porosity, small grain size, high adsorption activity and poor crystallization property. The birnessite type manganese dioxide nanosheet is adopted as the hydrogen-sensitive element, so that the sensitivity of the sensor is increased, and the working temperature is reduced.

Description

technical field [0001] The invention relates to a hydrogen sensor, in particular to a birnessite-type manganese dioxide nanosheet hydrogen sensor and a preparation method thereof. Background technique [0002] As a reducing gas and carrier gas, hydrogen is widely used in petrochemical, electronics, medical and other fields. At the same time, hydrogen has the advantages of high energy storage density and no pollution. It is an ideal clean energy and is favored by people. However, hydrogen is also a flammable and explosive gas, and it is easy to explode when mixed with air; hydrogen has a small molecular weight and strong penetration, and it is prone to leakage during production, transfer, storage, and use, which makes the detection of hydrogen in the environment abnormal Important, so research on hydrogen sensors continues. [0003] For a long time, people have been trying to find hydrogen-sensitive materials and hydrogen sensors with high sensitivity, fast response, good s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04
Inventor 田先清王新锋余堃卿小霞
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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