The development of new microelectrode gas sensors: An odyssey

Nitrous Oxide Is No Laughing Matter: A Historical Review of Nitrous Oxide Gas-Sensing Capabilities Highlighting the Need for Further Exploration

“…However, CO 2 reduction started to show a different behavior at a CO 2 -to-N 2 O volume ratio of >1, which might be problematic for the N 2 O detection at low concentrations. With the same electrochemical cell, the authors reported the solution for the severe CO 2 cross-interference by substituting the long-time interval linear voltammetry with potential step chronoamperometry at sufficiently short time intervals . The short duration of applied potential resulted in a lower concentration of side-reaction products and thereby alleviated the cross-interferent reactions.…”

“…With the same electrochemical cell, the authors reported the solution for the severe CO 2 cross-interference by substituting the long-time interval linear voltammetry with potential step chronoamperometry at sufficiently short time intervals. 56 The short duration of applied potential resulted in a lower concentration of side-reaction products and thereby alleviated the cross-interferent reactions. Furthermore, the diffusion-layer thickness became smaller at a shorter applied potential interval and stayed within the electrolyte layer between the electrode surface and the polytetrafluorethylene membrane.…”

Amperometric Gas SensorsA Review

“…More recently, gold microelectrodes are used with and without membranes in nonaqueous media for oxygen, carbon dioxide, and nitrous oxide detection simultaneously over a wide concentration range. , It is believed that, by using sufficiently small microelectrodes, it should be possible to effectively “outrun” the reaction kinetics by the much faster loss of species from the electrode/electrolyte interface by diffusion, thereby giving rise to independent oxygen and carbon dioxide signals. Hahn and co-workers also conducted the microelectrode studies of isoflourane vapor, an inhalation anesthetic agent, and oxygen mixtures in dimethyl sulfoxide .…”

Electrochemical Synthesis of Yttrium Oxide Nanotubes

“…Figure a shows the cyclic voltammogram (CV) for N 2 O for a potential scan between 0 V and −3.5 V versus Pt (QRE). A cathodic wave is observed at −3.1 V corresponding to reduction of N 2 O . During the positive, return scan no reoxidation of the reduced product is observed, showing that the N 2 O reduction is chemically irreversible under these conditions.…”

“…Instead, two smaller anodic peaks are observed at −1.07 V and −0.62 V. These increase with N 2 O concentration, indicating that they result from N 2 O reduction. The larger anodic peak at −0.62 V is attributed to oxidation of superoxide, which is the major reaction product of N 2 O reduction under these conditions . Figure b shows CVs for a solution containing only YI 3 (background, solid line) and for one containing both N 2 O and YI 3 (dotted line).…”