Simultaneous Synthesis of Ozone and Hydrogen Peroxide in a Proton‐Exchange‐Membrane Electrochemical Reactor

Tatapudi, Pallav; Fenton, James M.

doi:10.1149/1.2054892

Cited by 38 publications

(26 citation statements)

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“…5,6 While dissolved ozone is generated at the anode, the possibility of cogeneration of hydrogen peroxide, another green oxidant, at the cathode gives additional attractive options. 7 An electrochemical ozone generator has an anode and a cathode separated by a liquid or solid electrolyte. Ozone is formed by electrolytic decomposition of water at the anode by either of two equations…”

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confidence: 99%

Electrolytic Generation of Ozone on an Antimony-Doped Tin Dioxide Coated Electrode

Cheng

Chan

2004

Electrochem. Solid-State Lett.

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Dissolved ozone up to 34 mg/L was generated by direct electrolysis of water using a titanium electrode coated with an antimonydoped tin dioxide film. The electrode was prepared by spray pyrolysis at 520°C. The current efficiency of ozone generation was 15% in a 0.1 M HClO 4 aqueous solution at room temperature. The electrolytic generation of ozone depends critically on the composition and morphology of the coating and a good generation was observed with Sb:Sn atomic ratio of 1:7 and a smooth and compact surface with connected particles of 3-5 nm diameter.The generation of ozone by the direct electrolysis of water is attractive for applications of disinfection and oxidation in aqueous media. Ideally, the electrochemical route can generate a high concentration of dissolved ozone with a high current efficiency, and without the high voltages needed in conventional ozone generators. The scalable and flexible generation can lead to devices suitable for on-site utilization. 1-4 In addition to green oxidation of pollutants, ozone has other applications such as chemical syntheses. 5,6 While dissolved ozone is generated at the anode, the possibility of cogeneration of hydrogen peroxide, another green oxidant, at the cathode gives additional attractive options. 7 An electrochemical ozone generator has an anode and a cathode separated by a liquid or solid electrolyte. Ozone is formed by electrolytic decomposition of water at the anode by either of two equationsThese reactions are normally not observed because the dioxygen evolution reaction, thermodynamically more favorable, occurs at a much lower potential according to the equation

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confidence: 99%

Electrolytic Generation of Ozone on an Antimony-Doped Tin Dioxide Coated Electrode

Cheng

Chan

2004

Electrochem. Solid-State Lett.

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“…Figure 1 show a schematic of the electrolysis approach using an SPE cell. [3,[13][14][15][16][17][18][19] In fuel-cell mode, a fuel (e.g., H 2 ) is used on the anode, while an oxidant (air or O 2 ) is used on the cathode and power is delivered to an external electrical load. Protons, from the oxidation of water, diffuse through the membrane to the cathode electrode, where they react with oxygen to form hydrogen peroxide.…”

Section: Introductionmentioning

confidence: 99%

“…There have been a number of studies on H 2 O 2 production in neutral/acidic media, but with limited commercial success. [3,[13][14][15][16][17][18][19] In fuel-cell mode, a fuel (e.g., H 2 ) is used on the anode, while an oxidant (air or O 2 ) is used on the cathode and power is delivered to an external electrical load. Electro-oxidation of H 2 at the anode generates protons and electrons, and a proton exchange membrane (PEM) allows for the transport of the protons to the cathode, where they react with the oxygen to form H 2 O 2 .…”

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confidence: 99%

Drinking Water Purification by Electrosynthesis of Hydrogen Peroxide in a Power‐Producing PEM Fuel Cell

Bonakdarpour

Gyenge

et al. 2013

ChemSusChem

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The industrial anthraquinone auto-oxidation process produces most of the world's supply of hydrogen peroxide. For applications that require small amounts of H2 O2 or have economically difficult transportation means, an alternate, on-site H2 O2 production method is needed. Advanced drinking water purification technologies use neutral-pH H2 O2 in combination with UV treatment to reach the desired water purity targets. To produce neutral H2 O2 on-site and on-demand for drinking water purification, the electroreduction of oxygen at the cathode of a proton exchange membrane (PEM) fuel cell operated in either electrolysis (power consuming) or fuel cell (power generating) mode could be a possible solution. The work presented here focuses on the H2 /O2 fuel cell mode to produce H2 O2 . The fuel cell reactor is operated with a continuous flow of carrier water through the cathode to remove the product H2 O2 . The impact of the cobalt-carbon composite cathode catalyst loading, Teflon content in the cathode gas diffusion layer, and cathode carrier water flowrate on the production of H2 O2 are examined. H2 O2 production rates of up to 200 μmol h(-1) cmgeometric (-2) are achieved using a continuous flow of carrier water operating at 30 % current efficiency. Operation times of more than 24 h have shown consistent H2 O2 and power production, with no degradation of the cobalt catalyst.

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“…7,11 This efficiency significantly decreases upon increasing temperature to room temperature. 7,11 Although electrogeneration of O 3 has been extensively studied at planar electrodes, [19][20][21][22] it is not well documented on porous electrodes, especially flow-through porous electrode. Flowing electrolyte or continuous process has advantages over batch process as it gives a continuous feed of the dissolved products.…”

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confidence: 99%

“…ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.192.114 19. Downloaded on 2015-07-13 to IP…”

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Ozone Electrogeneration on Pt-Loaded Reticulated Vitreous Carbon Using Flooded and Flow-Through Assembly

Awad

Saleh

Ohsaka

2006

J. Electrochem. Soc.

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Electrogeneration of ozone ͑O 3 ͒ was investigated at platinum-loaded reticulated vitreous carbon ͑RVC͒. Stationary and flowing H 2 SO 4 solutions, i.e., flooded and flow-through porous electrodes, respectively, were used at room temperature ͑25°C͒. The study evaluates the flow-through porous electrode for a continuous production of O 3 -aqueous solutions. O 3 was generated potentiostatically by applying a constant potential for 5 min. The flooded electrode showed a negligible O 3 current efficiency at the bare RVC compared to a value of 2.2% at the Pt-loaded RVC electrode ͑RVC/Pt͒. At the flow-through porous electrode, the effects of acid concentration and electrolyte flow rate on the concentration of O 3 generated and on the current efficiency of O 3 electrogeneration at RVC/Pt were explored. The O 3 concentration increased in the outlet stream with H 2 SO 4 concentration. The current efficiency did not change significantly with the electrolyte flow rate, but the higher concentration of O 3 in the outlet stream was obtained at lower flow rates. The current efficiency remained nearly unchanged but the specific electrical energy consumption ͑kWh kg −1 of O 3 ͒ decreased significantly with the acid concentration. The stability of the RVC/Pt electrodes was examined by measuring the time-course of the electrolysis current at a given applied potential and the scanning electron microscopy images of the electrode surfaces before and after the electrolysis.Ozone ͑O 3 ͒ is a potent oxidant and considered to be the candidate for the application of advanced oxidation technology. It is the first choice as disinfectant when a high purification standard of drinking water is needed. 1-6 Generally, there are two methods for the generation of O 3 , the electrochemical and the corona methods. The former leads the latter one as it generates O 3 at higher current efficiencies and it enables on-site applications of O 3 which is a solution for the instability of O 3 ͑short half-life time͒. 7-10 However, electrochemical generation of O 3 requires a higher anodic potential in comparison with the oxygen evolution ͑Eq. 1 and 2͒On the other hand, carbon electrodes have been reported to be inactive for anodic ozone evolution under common experimental conditions in addition to its instability for the severe environment. The latter includes the formation of strong oxidant, applying a high anodic potential for generation of O 3 , and operating at low pH in the anodic compartment. 11 Under special conditions of very low temperature and in the presence of fluoride-containing electrolytes, glassy carbon electrode ͑GCE͒ has been proved to be an efficient ozone generator with a high current efficiency of 62% at −5°C. 7 The high current efficiency suggested that the fluoride anion modifies the adsorbability of the O 2 intermediate in such a way that the O 3 yield is increased. 11 It could also be attributed to the low temperature as decreasing temperature generally increases O 3 yield via inhibiting O 2 electrochemical evolution and decreasing the ...

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Simultaneous Synthesis of Ozone and Hydrogen Peroxide in a Proton‐Exchange‐Membrane Electrochemical Reactor

Cited by 38 publications

References 1 publication

Electrolytic Generation of Ozone on an Antimony-Doped Tin Dioxide Coated Electrode

Electrolytic Generation of Ozone on an Antimony-Doped Tin Dioxide Coated Electrode

Drinking Water Purification by Electrosynthesis of Hydrogen Peroxide in a Power‐Producing PEM Fuel Cell

Ozone Electrogeneration on Pt-Loaded Reticulated Vitreous Carbon Using Flooded and Flow-Through Assembly

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