Highly selective amperometric sensors for carbon monoxide detection in exhaust gas
Highly selective amperometric sensors for carbon monoxide detection in exhaust gas
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DOI：
10.1016/j.snb.2011.10.081
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发表时间：
2012-01
影响因子：
8.4
通讯作者：
C. Phawachalotorn;Oravan Sanguanruang;T. Ishihara
中科院分区：
文献类型：
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作者：
C. Phawachalotorn;Oravan Sanguanruang;T. Ishihara
基于LaGaO 3的电流型电化学传感器在300°C ~ 500°C范围内对一氧化碳（CO）具有很高的灵敏度。在本研究中，各种Fe掺杂的LaGaO_3电解质，（La0.8Sr0.2Ga0.8Mg0.2-xFexO 3; x=0.05，0.10，0.15，0.2和La0.8Sr0.2Ga1-xFexO 3; x=0.10，0.15，0.2，0.3）与Au10wt%-In1.9Sn0.1O3（ITO 955）和RuO 2-La0.6Sr0.4CoO3（LSC 64）偶联作为电极催化剂。在所检测的电解质中，通过向电解质（表示为LSGF 828515）中掺杂15mol%的Fe，获得了8.83mA/decade（在500°C下）的最高灵敏度。所有研究的传感器的灵敏度都很高，电流随着CO浓度的增加而增加。该传感器是快速的，高灵敏度的CO和几乎不敏感的其他共存的气体，如甲烷，二氧化碳和氢气。因此，该传感器可用于小型室内燃烧源排放的CO监测。
An amperometric electrochemical sensor based on LaGaO3was demonstrated as highly sensitive to carbon monoxide (CO) in the temperatures ranging from 300°C to 500°C. In the present study, various Fe-doped LaGaO3electrolytes (La0.8Sr0.2Ga0.8Mg0.2−xFexO3; x=0.05, 0.10, 0.15, 0.2 and La0.8Sr0.2Ga1−xFexO3; x=0.10, 0.15, 0.2, 0.3) coupled with Au10wt%–In1.9Sn0.1O3(ITO955) and RuO2–La0.6Sr0.4CoO3(LSC64) as the electrode catalysts were investigated. Highest sensitivity was achieved at 8.83mA/decade (at 500°C) by doping 15mol% Fe into electrolyte (denoted as LSGF 828515) among the examined electrolytes. The sensitivities of all studied sensors were high and the current increased with increasing CO concentration. The sensors were fast, highly sensitive to CO and almost insensitive to other coexisting gases such as CH4, CO2, and H2. Therefore, this sensor can be used for CO monitoring of exhaust gas from a small indoor combustion source.