Electrochemical ammonia gas sensor chip and use method thereof

Abstract

The invention discloses an electrochemical ammonia gas sensor chip which is integrally in a sheet shape and comprises a first solid electrolyte layer, a second solid electrolyte layer, a third solid electrolyte layer, a fourth solid electrolyte layer and a fifth solid electrolyte layer. The first solid electrolyte layer is provided with an opening I and a diffusion barrier I; a gas chamber I, a gas chamber II, a gas chamber III, an auxiliary electrode I, an auxiliary electrode II, a measuring electrode, a diffusion barrier II and a diffusion barrier III are arranged on the second solid electrolyte layer, and a reference gas channel and a reference electrode are arranged on the side face of the fourth solid electrolyte layer. Ammonia gas in the gas is oxidized into nitric oxide, converted into electric potential and applied to the measuring electrode, and the concentration of the ammonia gas is determined by detecting the pump current between the auxiliary electrode II and the measuring electrode. The problems that a common ammonia gas sensor chip is short in service life and cannot be used under the high-temperature condition are solved, and the ammonia gas sensor chip is high in sensitivity, high in response speed and high in reliability.

Description

technical field [0001] The invention relates to the field of an electrochemical ammonia sensor chip and a use method thereof, in particular to an electrochemical ammonia sensor chip and a use method thereof. Background technique [0002] A car engine is a machine that burns fuel inside the machine and converts the heat energy it releases directly into power. At present, people prefer to use lean combustion mixture as fuel in order to save fuel, but harmful polluting gas nitrogen oxides NOx will be produced in the process. In the aftertreatment of engine exhaust, the SCR system using urea as the selective catalytic reductant is widely used. The principle is that urea is injected into the exhaust pipe and decomposed into NH by heat 3 Reacts with NOx to generate harmless N 2 and H 2 0. For precise control of NH 3 content, it is necessary to install NH in the exhaust pipe 3 The sensor monitors the NH3 concentration online and feeds back the electrical signal to the contro...

AI Technical Summary

Problems solved by technology

At the same time, the invention can measure the concentration of ammonia contained in the gas mixture, and can be used as a sensor chip for measuring the concentration of ammonia in the high-temperature exhaust gas of automobiles for a

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