The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 08, 2002
Filed:
Mar. 10, 2000
Norihiko Nadanami, Komaki, JP;
Takafumi Oshima, Nagoya, JP;
Hiroki Fujita, Komaki, JP;
Ryuji Inoue, Tajimi, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A gas sensor comprising a proton-conductive layer formed of a polymer electrolyte; first and second electrodes and disposed in contact with the proton-conductive layer and having a function of dissociating hydrogen; a gas-diffusion-rate limiting layer disposed between a measurement gas atmosphere and the first electrode and adapted to diffuse the gas under measurement to the first electrode in a diffusion-rate limited state; and a dense support supporting these elements. Hydrogen gas having reached the first electrode via the gas-diffusion-rate limiting layer is dissociated into protons by virtue of the catalytic action of Pt contained in the electrode and the voltage applied to the first electrode , and the generated protons are pumped to the second electrode via the proton-conductive layer and are converted to hydrogen gas, which diffuses into the measurement gas atmosphere. When the applied voltage is sufficiently high, saturation current flows between the first and second electrodes and , and the magnitude of the saturation current varies in proportion to the hydrogen gas concentration of the gas under measurement. A hydrogen gas sensor which operates at low temperature in a hydrogen-rich atmosphere, and which can accurately measure hydrogen gas concentration of a fuel gas of a fuel cell, is thereby provided.