Hydrogen sulfide (H2S) is a gas produced in the body that has physiological importance, especially in cardiovascular and neurological systems. As a result, detection of H2S has gained the attention of the scientific community in order to study its role within the body in real time. Electrochemistry is an attractive means for this due to its high sensitivity, fast response and potential for miniaturization. However, selective detection of H2S is greatly impaired due to the presence of other biological gases, such as nitrogen monoxide (NO) and carbon monoxide (CO). These hinder the selectivity of H2S due to similarities in size, structure, and charge. In the past, (CN)2-FePP supported on Pt was shown to be initially very selective towards H2S over CO and NO; however, the selectivity quickly diminished with use. The reason for this is not fully understood, but is suspected to be due to sulfide species penetrating the porphyrin layer and interacting with the underlying Pt surface. Solutions to improve the (CN)2-FePP signal have been actively sought to address this problem. Computational modeling has shown that H2S has a much lower affinity for carbon compared to Pt. This presentation will compare the electrochemical response of (CN)2-FePP polymerized on to carbon fiber and platinum microelectrodes, in order to determine whether the (CN)2-FePP/carbon fiber system produces a more reproducible and selective H2S signal.

Electrochemical comparison of dicyanoferriprotoporphyrin-modified carbon and Pt microelectrodes for selective H2S detection

255th National Meeting (2018)

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