Electrochemistry / Gases / SensorsResults of potentiodynamic and potentiostatic measurements of the electrooxidation of ammonia traces with platinum as a catalyst in a strong alkaline electrolyte are reported. To improve the performance of a fuel cell, such as an electrochemical gas sensor for ammonia traces, the hydrophobicity of the Teflon-bonded platinum black gas diffusion working electrode is varied. The expectation that with increasing Teflon content of the catalytic anode the long term characteristics are enhanced could not be confirmed. The weakening of the cell current is influenced much more by effects belonging to the incorporation of carbon dioxide in the electrolyte. -The optimal operating potential for a three-electrode cell arrangement, which depends also on the cross sensitivities to other gases, is in the range of 1.1 to 1.3 Volts.
Electrochemical gas sensors -principles and perspectives of a continuous sensor checkElectrochemical sensors are best suited for the detection of sub concentrations of toxic gases. Typical use are in the detection of toxic and corrosive gases in the workplace through the use of portable and fixed stationary monitors and stack gas monitoring forfugitive emissions. The following article will explain the principle of several amperometrie sensors and how varying electrical and chemical parameters can affect the sensitivity and selectivity. Finally, the potential of this technique to provide a continuous check of the sensors output function by the use of corresponding ac-impedance measurements will be demonstrated.
Untersucht wird speziell die Wirkung von Kobalt‐ und Wolframcarbid‐Zusätzen zu Eisenfallungskatalysatoren um bei der Fischer‐Tropsch‐Synthese eine höhere Selektivität in Richtung auf kurzkettige Olefine zu erreichen.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.