期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 6, 页码 6166-6173出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b22310
关键词
electrochemical sensor; room-temperature ionic liquid; solid polymer electrolyte; laser-induced graphene; methane detection; greenhouse gas mitigation
资金
- Pro-Flange Ltd., our industrial partner via the NSERC Engage
- Ontario Centers for Excellence Voucher for Innovation and Productivity I programs
Methane is a potent greenhouse gas, with large emissions occurring across gas distribution networks and mining/extraction infrastructure. The development of inexpensive, low-power electrochemical sensors could provide a cost-effective means to carry out distributed sensing to identify leaks for rapid mitigation. In this work, we demonstrate a simple and cost-effective strategy to rapidly prototype ultrasensitive electrochemical gas sensors. A room-temperature methane sensor is evaluated which demonstrates the highest reported sensitivity (0.55 mu A/ppm/cm(2)) with a rapid response time (40 s) enabling sub-ppm detection. Porous, laser-induced graphene (LIG) electrodes are patterned directly into commercial polymer films and imbibed with a palladium nanoparticle dispersion to distribute the electrocatalyst within the high surface area support. A pseudo-solid-state ionic liquid/polyvinylidene fluoride electrolyte was painted onto the flexible cell yielding a porous electrolyte, within the porous LIG electrode, simultaneously facilitating rapid gas transport and enabling the room temperature electro-oxidation pathway for methane. The performance of the amperometric sensor is evaluated as a function of methane concentration, relative humidity, and tested against interfering gases.
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