Electrochemical Detection of Organic Gases: The Development of a Formaldehyde Sensor

Baltruschat, Helmut; Anastasijević, N.; Bełtowska-Brzezinska, Maria; Hambitzer, G.; Heitbaum, J.

doi:10.1002/bbpc.19900940923

Cited by 42 publications

(17 citation statements)

References 12 publications

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“…There had been two early reports of non-Faradaic rate enhancements in aqueous electrochemistry. − Despic and co-workers found a significant enhancement in the time-averaged rate of ester hydrolysis on a Pt electrolyte subject to cyclic voltammetric treatment . Although the time-averaged absolute Faradaic efficiency Λ, which we define from was below unity in that study, the time-averaged enhancement factor Λ*, which we define from was obviously very large and approached infinity, since the denominator in eq 6 vanishes during the cyclic voltammetric experiments while the numerator, interestingly, remained positive.…”

Section: Introductionmentioning

confidence: 74%

Non-Faradaic Electrochemical Modification of the Catalytic Activity of Pt for H₂ Oxidation in Aqueous Alkaline Media

et al. 1996

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The heterogeneous catalytic oxidation of H2 on Pt was investigated on Pt black and Pt−graphite electrodes, also serving as heterogeneous catalysts, in aqueous alkaline solutions as a function of electrode potential and current. Hydrogen−oxygen mixtures were bubbled over the surface of the Pt electrode through a porous Teflon frit, and the rates of H2 and O2 consumption were measured via on-line mass spectrometry and gas chromatography. It was found that positive current application enhances the catalytic rate of H2 oxidation by up to 500% and that the increase in the catalytic rate is up to 100 times larger than the increase I/2F of the electrocatalytic rate corresponding to Faraday's law. The results show that the heterogeneously catalyzed H2 oxidation proceeds in parallel with the electrocatalytic anodic H2 oxidation and that its rate is markedly affected by the catalyst potential and work function. This electrochemically induced and controlled reversible promotion of the catalytic properties of Pt bears many similarities to the effect of electrochemical promotion when using solid electrolytes and can be rationalized by considering the effect of varying potential and work function on the coverages and binding strengths of dissociatively chemisorbed hydrogen and oxygen.

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Section: Introductionmentioning

confidence: 74%

Non-Faradaic Electrochemical Modification of the Catalytic Activity of Pt for H₂ Oxidation in Aqueous Alkaline Media

et al. 1996

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“…(27) and (28) predict a linear decrease in H ad with increasing , whereas for electron donor adsorbates (λ j > 0) they predict a linear decrease in H ad with decreasing . (27) and (28) predict a linear decrease in H ad with increasing , whereas for electron donor adsorbates (λ j > 0) they predict a linear decrease in H ad with decreasing .…”

Section: Double-layer Isotherms and Kineticsmentioning

confidence: 97%

Electrochemical Modification of Catalytic Activity

Vayenas

Katsaounis

Brosda

et al. 2008

Handbook of Heterogeneous Catalysis

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The sections in this article are Introduction Catalytic and Electrocatalytic Kinetics Solid Electrolytes Solid Electrolyte Potentiometry ( SEP ) Electrocatalytic Operation of Solid Electrolyte Cells Electrochemical Promotion of Catalysis Selectivity Modification and Promotional Effects on Chemisorption Selectivity Modification Promotional Effects on Chemisorption Basic Questions Origin of Electrochemical Promotion Magnitude of Electrochemical Promotion and the Sacrificial Promoter Mechanism Mechanism of Metal–Support Interactions Interrelation of Promotion, Electrochemical Promotion and Metal–Support Interactions: the Double‐Layer Model of Catalysis Why the “New” Supports? Double‐Layer Approach to Catalysis Why Double Layer? Rationalization and Prediction of Desired Types of Promoters and Supports The Four Types of Rate–Work Function Dependence and the Promotional Rules Double‐Layer Isotherms and Kinetics Electropromotion of Thin Films and Electropromoted Monolithic Reactors Summary and Perspectives Outlook

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“…Baltruschat et al [37] have developed a formaldehyde sensor. Platinum is sputtered onto a porous Teflon membrane as both reference and counter electrode and gold is sputtered onto another Teflon membrane as the working electrode.…”

Section: Formaldehydementioning

confidence: 99%

Electrochemical sensing of gases based on liquid collection interfaces

Huiliang

Dasgupta

1997

Electroanalysis

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Although many electrochemical gas sensors have been reported, electrochemical gas sensors based on liquid collection constitute a smaller subset. Minimally, a liquid interface based electrochemical gas sensor is composed of two electrodes and an ion conducting electrolyte. There is a large number of possible arrangements of these parts, and many choices exist for their composition and preparation methods. This results in a diverse and rich technology now available for gas sensing. The measurement of some analyte gases of interest, notably ozone, nitrogen oxides, hydrogen peroxide, formaldehyde, ammonia, sulfur dioxide and hydrogen sulfide are specifically discussed. Finally, the recent reviews that are likely to be the most relevant to the further development of electrochemical detection approaches for gases with a liquid collection interface are cited and discussed.

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Electrochemical Detection of Organic Gases: The Development of a Formaldehyde Sensor

Cited by 42 publications

References 12 publications

Non-Faradaic Electrochemical Modification of the Catalytic Activity of Pt for H₂ Oxidation in Aqueous Alkaline Media

Non-Faradaic Electrochemical Modification of the Catalytic Activity of Pt for H₂ Oxidation in Aqueous Alkaline Media

Electrochemical Modification of Catalytic Activity

Electrochemical sensing of gases based on liquid collection interfaces

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Electrochemical Detection of Organic Gases: The Development of a Formaldehyde Sensor

Cited by 42 publications

References 12 publications

Non-Faradaic Electrochemical Modification of the Catalytic Activity of Pt for H2 Oxidation in Aqueous Alkaline Media

Non-Faradaic Electrochemical Modification of the Catalytic Activity of Pt for H2 Oxidation in Aqueous Alkaline Media

Electrochemical Modification of Catalytic Activity

Electrochemical sensing of gases based on liquid collection interfaces

Contact Info

Product

Resources

About

Non-Faradaic Electrochemical Modification of the Catalytic Activity of Pt for H₂ Oxidation in Aqueous Alkaline Media

Non-Faradaic Electrochemical Modification of the Catalytic Activity of Pt for H₂ Oxidation in Aqueous Alkaline Media