Catalytic Synthesis of Neutral H2O2 Solutions from O2 and H2 by a Fuel Cell Reaction

Yamanaka, Ichiro; Tazawa, Satoshi; Murayama, Toru; Ichihashi, Ryo; Hanaizumi, Noriko

doi:10.1002/cssc.200800176

Cited by 49 publications

(37 citation statements)

References 20 publications

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“…The electrocatalytic activities of the Co _ TPP/VGCF-coating cathode in mode-2 and mode-4 were very similar, but the concentration of 3.09 mol dm -3 (0.61 cm 3 ) in mode-4 was higher than 1.88 mol dm -3 (1.1 cm 3 ) in mode-2, due to the initial water (0.5 cm 3 ) in the cathode. As described above, mode-4 is a better reaction mode for H2O2 synthesis 27) . With deionized water added up to the top of the anode in mode-4, the current density decreased drastically to 1 mA.…”

Section: Effect Of Reaction Modes On H2o2 Formationmentioning

confidence: 92%

“…Accumulation of water in the cathode compartment was observed due to transport of water coordinated to H from the anode to cathode compartments. The ratio of the quantity of transported water (mol) per transported H (mol), water/H , was 3.2 for mode-4 27) . The effect of addition of water to the half level of the anode may be washing away of H2O2 from the thin three-phase boundary at the cathode.…”

Section: Effect Of Reaction Modes On H2o2 Formationmentioning

confidence: 97%

“…The current density was stable and the H2O2 yield increased linearly with process time for 8 h. Pure 3.8 mol dm -3 H2O2 aq. solution dropped from the cathode and accumulated at the bottom of the cathode compartment with 42 % CE for 8 h. The turnover frequency of Co for H2O2 formation was 14 s -1 and the total turnover number was 4 10 5 for 8 h 27) . The effect of the amount of the electrocatalyst (0.05 wt% Co _ TPP/VGCF) coated on the VGCF base electrode on H2O2 formation was studied.…”

Section: Effect Of Reaction Modes On H2o2 Formationmentioning

confidence: 99%

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燃料電池型反応器を用いた酸素，水素からの過酸化水素の直接かつ安全な合成法

Yamanaka

2014

J. Jpn. Petrol. Inst.

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Direct synthesis of H2O2 aqueous solutions from O2 and H2 using a fuel cell reactor was reviewed. H2O2 can be catalytically produced by electrochemical reaction without external electrical supply. New electrocatalysts and four types of fuel cell reactors were designed and developed to achieve higher performance of H2O2 formation, ex. an Au-mesh cathode and a type-1 reactor for H2O2/HCl aq. solutions, a heat-treated Mn _ porphyrin/ activated-carbon cathode and a type-2 reactor for H2O2/H2SO4 aq. solutions, a vapor-grown-carbon-fiber (VGCF) cathode and a type-3 reactor for H2O2/NaOH aq. solutions, and a heat-treated Co _ porphyrin/VGCF cathode and a type-4 reactor for pure H2O2 aq. solutions. These studies indicated that synergy of selective electrocatalysis of the cathode and three-phase boundary of O2 (gas phase), electrocatalyst (solid phase) and electrolyte (liquid phase) were essential for the efficient reduction of O2 to H2O2. Therefore, direct synthesis of a pure H2O2 aq. solution of over 4.0 mol dm -3 was achieved with a good current efficiency of 42 %.

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Section: Effect Of Reaction Modes On H2o2 Formationmentioning

confidence: 92%

Section: Effect Of Reaction Modes On H2o2 Formationmentioning

confidence: 97%

Section: Effect Of Reaction Modes On H2o2 Formationmentioning

confidence: 99%

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燃料電池型反応器を用いた酸素，水素からの過酸化水素の直接かつ安全な合成法

Yamanaka

2014

J. Jpn. Petrol. Inst.

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“…As a general trend, FePc promotes the direct 4e − ORR to water, while CoPc catalyzes the 2e − path leading to H 2 O 2 [4,5,43,44].…”

Section: Electrochemical Studiesmentioning

confidence: 99%

Single-site and nanosized Fe–Co electrocatalysts for oxygen reduction: Synthesis, characterization and catalytic performance

Bambagioni

Bianchini

Filippi

et al. 2011

Journal of Power Sources

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“…Very recently, we have succeeded in producing neutral solutions of H 2 O 2 with CE values lower than 50 % using the improved fuel-cell reactor. [24,25] A high CE value of about 95 % using NaOH aqueous electrolyte is a particular advantage for the manufacture of hydrogen peroxide.…”

Section: Resultsmentioning

confidence: 99%

A Fuel‐Cell Reactor for the Direct Synthesis of Hydrogen Peroxide Alkaline Solutions from H₂ and O₂

Yamanaka¹,

Onisawa²,

Hashimoto³

et al. 2011

ChemSusChem

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The effects of the type of fuel-cell reactors (undivided or divided by cation- and anion-exchange membranes), alkaline electrolytes (LiOH, NaOH, KOH), vapor-grown carbon fiber (VGCF) cathode components (additives: none, activated carbon, Valcan XC72, Black Pearls 2000, Seast-6, and Ketjen Black), and the flow rates of anolyte (0, 1.5, 12 mL h(-1)) and catholyte (0, 12 mL h(-1)) on the formation of hydrogen peroxide were studied. A divided fuel-cell system, O(2) (g)|VGCF-XC72 cathode|2 M NaOH catholyte|cation-exchange membrane (Nafion-117)|Pt/XC72-VGCF anode|2 M NaOH anolyte at 12 mL h(-1) flow|H(2) (g), was effective for the selective formation of hydrogen peroxide, with 130 mA cm(-2) , a 2 M aqueous solution of H(2)O(2)/NaOH, and a current efficiency of 95 % at atmospheric pressure and 298 K. The current and formation rate gradually decreased over a long period of time. The cause of the slow decrease in electrocatalytic performance was revealed and the decrease was stopped by a flow of catholyte. Cyclic voltammetry studies at the VGCF-XC72 electrode indicated that fast diffusion of O(2) from the gas phase to the electrode, and quick desorption of hydrogen peroxide from the electrode to the electrolyte were essential for the efficient formation of solutions of H(2)O(2)/NaOH.

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Catalytic Synthesis of Neutral H₂O₂ Solutions from O₂ and H₂ by a Fuel Cell Reaction

Cited by 49 publications

References 20 publications

燃料電池型反応器を用いた酸素，水素からの過酸化水素の直接かつ安全な合成法

燃料電池型反応器を用いた酸素，水素からの過酸化水素の直接かつ安全な合成法

Single-site and nanosized Fe–Co electrocatalysts for oxygen reduction: Synthesis, characterization and catalytic performance

A Fuel‐Cell Reactor for the Direct Synthesis of Hydrogen Peroxide Alkaline Solutions from H₂ and O₂

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Catalytic Synthesis of Neutral H2O2 Solutions from O2 and H2 by a Fuel Cell Reaction

Cited by 49 publications

References 20 publications

燃料電池型反応器を用いた酸素，水素からの過酸化水素の直接かつ安全な合成法

燃料電池型反応器を用いた酸素，水素からの過酸化水素の直接かつ安全な合成法

Single-site and nanosized Fe–Co electrocatalysts for oxygen reduction: Synthesis, characterization and catalytic performance

A Fuel‐Cell Reactor for the Direct Synthesis of Hydrogen Peroxide Alkaline Solutions from H2 and O2

Contact Info

Product

Resources

About

Catalytic Synthesis of Neutral H₂O₂ Solutions from O₂ and H₂ by a Fuel Cell Reaction

A Fuel‐Cell Reactor for the Direct Synthesis of Hydrogen Peroxide Alkaline Solutions from H₂ and O₂