Direct Synthesis of Hydrogen Peroxide (&amp;gt;1 wt%) over the Cathode Prepared from Active Carbon and Vapor-Grown-Carbon-Fiber by a New H2–O2 Fuel Cell System

Yamanaka, Ichiro; Hashimoto, Toshihide; Otsuka, Kiyoshi

doi:10.1246/cl.2002.852

Cited by 35 publications

(31 citation statements)

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“…2. using the type-1 reactor 12) . Clearly the type-2 FC reactor was effective for the formation of H2O2 solutions 20), 21) . The CE of 17 % at the [AC VGCF] cathode was higher than that of 9 % at the [Pdblack VGCF] cathode; so H2O2 formation on the [AC VGCF] cathode was studied.…”

Section: H2o2 Synthesis Using the Type-2 Fc Reactormentioning

confidence: 94%

“…The concept and structure of the new fuel cell reactor were investigated to achieve higher concentrations of H2O2 20) . Figure 3 shows the cross section of the new fuel cell reactor.…”

Section: Structure Of Type-2 Reactormentioning

confidence: 99%

“…On the other hand, the maximum concentration of H2O2 was only 0.33 mol dm -3 with a low CE of 20 % at a suitable [AC VGCF] cathode using H2SO4 aq. electrolyte 20), 21) . Clearly, electrocatalysis at the [AC VGCF] cathode was inferior in acid electrolyte.…”

Section: E V E L O P M E N T O F N E W a C T I V E C A T H O D E Elmentioning

confidence: 99%

“…The primary advantage is the lower explosion risk because O2 and H2 are separated by the electrolyte, and the cathode and anode membranes. New electrocatalysts and cell structures have been developed and reaction conditions improved to achieve efficient H2O2 formation 20) 29) . Our studies of the direct synthesis of H2O2 using the fuel cell method are reviewed here.…”

Section: Introductionmentioning

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: H2o2 Synthesis Using the Type-2 Fc Reactormentioning

confidence: 94%

“…The concept and structure of the new fuel cell reactor were investigated to achieve higher concentrations of H2O2 20) . Figure 3 shows the cross section of the new fuel cell reactor.…”

Section: Structure Of Type-2 Reactormentioning

confidence: 99%

Section: E V E L O P M E N T O F N E W a C T I V E C A T H O D E Elmentioning

confidence: 99%

Section: Introductionmentioning

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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“…A high partial pressure of O 2 (101 kPa, 45 mm) was supplied directly to the active site at the three-phase boundary. [20,21] The reduction of O 2 to H 2 O 2 was accelerated and the successive reduction of H 2 O 2 to water was decelerated; therefore, H 2 O 2 accumulated in high concentrations in an electrolyte of acid or alkali aqueous solutions. We have directly and selectively produced a 2 m solution of H 2 O 2 with a high current efficiency of 93 % by using a 2 m NaOH aqueous electrolyte.…”

Section: Introductionmentioning

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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Direct Synthesis of Hydrogen Peroxide: Recent Advances

Centi

Abate

2009

Modern Heterogeneous Oxidation Catalysis

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Direct Synthesis of Hydrogen Peroxide (>1 wt%) over the Cathode Prepared from Active Carbon and Vapor-Grown-Carbon-Fiber by a New H2–O2 Fuel Cell System

Abstract: A higher concentration of H2O2 solution (>1 wt%) was catalytically and directly synthesized from O2 and H2 over a [active carbon+vapor-grown-carbon-fiber] cathode by a new type of fuel cell system at 1 atm.

Cited by 35 publications

References 3 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

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

Direct Synthesis of Hydrogen Peroxide: Recent Advances

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Direct Synthesis of Hydrogen Peroxide (&gt;1 wt%) over the Cathode Prepared from Active Carbon and Vapor-Grown-Carbon-Fiber by a New H2–O2 Fuel Cell System

Abstract: A higher concentration of H2O2 solution (&gt;1 wt%) was catalytically and directly synthesized from O2 and H2 over a [active carbon+vapor-grown-carbon-fiber] cathode by a new type of fuel cell system at 1 atm.

Cited by 35 publications

References 3 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

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

Direct Synthesis of Hydrogen Peroxide: Recent Advances

Contact Info

Product

Resources

About

Direct Synthesis of Hydrogen Peroxide (>1 wt%) over the Cathode Prepared from Active Carbon and Vapor-Grown-Carbon-Fiber by a New H2–O2 Fuel Cell System

Abstract: A higher concentration of H2O2 solution (>1 wt%) was catalytically and directly synthesized from O2 and H2 over a [active carbon+vapor-grown-carbon-fiber] cathode by a new type of fuel cell system at 1 atm.

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