Mixed potential type hydrogen gas sensor using strontium doped lanthanum ferrite as sensitive electrode and preparation method thereof

A sensitive electrode and mixed potential technology, applied in the direction of material electrochemical variables, etc., can solve the problems of wide explosion limit range, low hydrogen density, easy hydrogen leakage, etc., achieve high response value, stable properties, and reduce process difficulty.

Inactive Publication Date: 2019-07-19
UNIV OF SCI & TECH OF CHINA
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  • Abstract
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Problems solved by technology

However, the low density of hydrogen gas, wide explosion limit range, and low ignition energy make hydrogen gas easily leak and cause explosi

Method used

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  • Mixed potential type hydrogen gas sensor using strontium doped lanthanum ferrite as sensitive electrode and preparation method thereof
  • Mixed potential type hydrogen gas sensor using strontium doped lanthanum ferrite as sensitive electrode and preparation method thereof
  • Mixed potential type hydrogen gas sensor using strontium doped lanthanum ferrite as sensitive electrode and preparation method thereof

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Embodiment 1

[0028] The mixed potential type hydrogen sensor in the present embodiment, with La 0.8 Sr 0.2 FeO 3-δ is a sensitive electrode, Pt is a reference electrode, and YSZ is a solid electrolyte. The specific implementation plan is as follows:

[0029] 1. Synthesis of sensitive material La by citrate method 0.8 Sr 0.2 FeO 3-δ

[0030] Weigh a certain amount of La(NO 3 ) 3 ·6H 2 O, Sr(NO 3 ) 2 and Fe(NO 3 ) 3 4H 2 O and dissolve them in deionized water, add nitric acid to the solution, add 0.22L nitric acid per mole of metal ion, stir well and then add citric acid to the solution, the mass ratio of citric acid to metal ion is 1.5:1 , and finally ammonia water was added to the solution until the pH of the solution was 7. The obtained solution was dried and burned on an electric heating furnace, and the ashes obtained from the combustion were collected and calcined in a muffle furnace at 1000°C for 3 hours, and the obtained powder was the sensitive material La 0.8 Sr 0.2...

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Abstract

The invention discloses a mixed potential type hydrogen gas sensor using strontium doped lanthanum ferrite as a sensitive electrode and a preparation method thereof, and belongs to the technical fieldof a gas sensor. The mixed potential type hydrogen gas sensor can be used for in situ detection of hydrogen gas at a high temperature, and consists of a perovskite oxide (La,Sr)FeO<3-Delta> sensitiveelectrode, a solid electrolyte (YSZ, GDC and the like) and a reference electrode (metallic Pt, Au and the like); and the sensitive electrode and the reference electrode can be positioned at the sameside or different sides of the solid electrolyte. The perovskite oxide (La,Sr)FeO<3-Delta> with excellent electrocatalytic activity on the hydrogen gas is used as a sensitive electrode material; and the built sensor has a high response value, excellent selectivity and high response-recovery speed on the hydrogen gas.

Description

technical field [0001] The invention belongs to the field of gas sensors, in particular to a sensor based on (La, Sr) FeO 3-δ The mixed potential hydrogen sensor which is a sensitive electrode and its preparation method can effectively monitor and monitor hydrogen in situ under high temperature environment. Background technique [0002] Hydrogen has the advantages of high calorific value, wide range of sources, and non-polluting products. It is considered to be one of the clean energy sources with the most potential to replace fossil fuels, and has attracted extensive attention from industry and academia. However, the low density of hydrogen, wide range of explosion limits, and low ignition energy make hydrogen easy to leak and cause explosions. Therefore, the development of high-performance sensors is of great significance for the production, transportation, storage and use of hydrogen. [0003] The mixed potential sensor has the advantages of high response value, simple d...

Claims

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Application Information

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IPC IPC(8): G01N27/30
CPCG01N27/30
Inventor 易建新张赫
Owner UNIV OF SCI & TECH OF CHINA
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