Mediated Oxidation and Determination of Gaseous Monomethyl Hydrazine in a Solid-State Voltammetric Cell Employing a Sol-Gel Electrolyte

Holmstrom, Scott D.; Sandlin, Zechariah D.; Steinecker, William H.; Cox, James A.

doi:10.1002/(sici)1521-4109(20000301)12:4<262::aid-elan262>3.0.co;2-f

Cited by 16 publications

(8 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The oxidation of alcohols [2,4,5,8], inorganic [9,10] and organic [11,12] sulfur compounds, glucose [13], hydrazine [8,14], aldehydes [15], nitrosamines [16,17], insulin [18,19], and tetracycline [20] are examples. As is typical with electrode reactions involving mediated electron transfer, signal-to-background ratios with amperometry under potentiostatic conditions are preferred over potentiodynamic methodology for analytical applications.…”

Section: Introductionmentioning

confidence: 99%

Assembly of crosslinked oxo-cyanoruthenate and zirconium oxide bilayers: Application in electrocatalytic films based on organically modified silica with templated pores

Rutkowska

Sęk

Mehdi

et al. 2014

Electrochimica Acta

Self Cite

View full text Add to dashboard Cite

Electrochemical deposition of crosslinked oxo-cyanoruthenate, Ru-O/CN-O, from a mixture of RuCl3 and K4Ru(CN)6 is known to yield a film on glassy carbon that promotes oxidations by a combination of electron and oxygen transfer. Layer-by-layer (LbL) deposition of this species and of a film formed by cycling of the electrode potential in a ZrO2 solution systematically increases the number of catalytically active sites of the Ru-O/CN-O on the electrode. The evaluation of the electrocatalytic activity was by cyclic voltammetric oxidation of cysteine at pH 2. Plots of the anodic peak current vs. the square root of scan rate were indicative of linear diffusion control of this oxidation, even in the absence of ZrO2, but the slopes of these linear plots increased with bilayer number, n, of (ZrO2 | Ru-O/CN-O)n. The latter observation is hypothesized to be due to an increased number of active sites for a given geometric electrode area, but proof required further study. To optimize utilization of the catalyst and to provide a size-exclusion characteristic to the electrode, the study was extended to LbL deposition of the composite in 50-nm pores of an organically modified silica film deposited by electrochemically assisted sol-gel processing using surface-bound poly(styrene sulfonate) nanospheres as a templating agent.

show abstract

Section: Introductionmentioning

confidence: 99%

Assembly of crosslinked oxo-cyanoruthenate and zirconium oxide bilayers: Application in electrocatalytic films based on organically modified silica with templated pores

Rutkowska

Sęk

Mehdi

et al. 2014

Electrochimica Acta

Self Cite

View full text Add to dashboard Cite

show abstract

“…An important design modification is to protrude the working electrode into the gas phase so that the electrochemical reaction occurs at the three-phase boundary, thereby eliminating the need for transfer of the analyte from the gas phase into the electrolyte. Based on this design, a detector for monomethyl hydrazine (MMH) was developed [87]. The working electrode was Pt modified with a film of RuOCN [42] that served as the catalyst for the oxidation of MMH.…”

Section: Sol-gels As Solid Electrolytes For Electrochemical Gas Sensorsmentioning

confidence: 99%

Electroanalysis based on stand-alone matrices and electrode-modifying films with silica sol-gel frameworks: a review

Miecznikowski

Cox

2020

J Solid State Electrochem

Self Cite

View full text Add to dashboard Cite

Silica sol-gel matrices and its organically modified analogues that contain aqueous electrolytes, ionic liquids, or other ionic conductors constitute stand-alone solid-state electrochemical cells when hosting electrodes or serve as modifying films on working electrodes in conventional cells. These materials facilitate a wide variety of analytical applications and are employed in various designs of power sources. In this review, analytical applications are the focus. Solid-state cells that serve as gas sensors, including in chromatographic detectors of gas-phase analytes, are described. Sol-gel films that modify working electrodes to perform functions such as hosting electrochemical catalysts and acting as size-exclusion moieties that protect the electrode from passivation by adsorption of macromolecules are discussed with emphasis on pore size, structure, and orientation. Silica sol-gel chemistry has been studied extensively; thus, factors that control its general properties as frameworks for solid-state cells and for thin films on the working electrode are well characterized. Here, recent advances such as the use of dendrimers and of nanoscale beads in conjunction with electrochemically assisted deposition of silica to template pore size and distribution are emphasized. Related topics include replacing aqueous solutions as the internal electrolyte with room-temperature ionic liquids, using the sol-gel as an anchor for functional groups and modifying electrodes with silica-based composites.

show abstract

“…Ruthenium oxide modification has been shown to provide a material for the amperometric detection of monomethyl hydrazine with a detection limit of 300 ppb [102, 103]. Copper cryptand moieties have been used for the optical detection of azide with a dynamic range of three orders of magnitude [100].…”

Section: Small Molecules and Ionsmentioning

confidence: 99%

Mesoporous Silicate Materials in Sensing

Melde

Johnson

Charles

2008

Sensors

237

115

View full text Add to dashboard Cite

Mesoporous silicas, especially those exhibiting ordered pore systems and uniform pore diameters, have shown great potential for sensing applications in recent years. Morphological control grants them versatility in the method of deployment whether as bulk powders, monoliths, thin films, or embedded in coatings. High surface areas and pore sizes greater than 2 nm make them effective as adsorbent coatings for humidity sensors. The pore networks also provide the potential for immobilization of enzymes within the materials. Functionalization of materials by silane grafting or through co-condensation of silicate precursors can be used to provide mesoporous materials with a variety of fluorescent probes as well as surface properties that aid in selective detection of specific analytes. This review will illustrate how mesoporous silicas have been applied to sensing changes in relative humidity, changes in pH, metal cations, toxic industrial compounds, volatile organic compounds, small molecules and ions, nitroenergetic compounds, and biologically relevant molecules.

show abstract

Mediated Oxidation and Determination of Gaseous Monomethyl Hydrazine in a Solid-State Voltammetric Cell Employing a Sol-Gel Electrolyte

Cited by 16 publications

References 25 publications

Assembly of crosslinked oxo-cyanoruthenate and zirconium oxide bilayers: Application in electrocatalytic films based on organically modified silica with templated pores

Assembly of crosslinked oxo-cyanoruthenate and zirconium oxide bilayers: Application in electrocatalytic films based on organically modified silica with templated pores

Electroanalysis based on stand-alone matrices and electrode-modifying films with silica sol-gel frameworks: a review

Mesoporous Silicate Materials in Sensing

Contact Info

Product

Resources

About