Direct electrochemical hydrogenation of toluene at Pt electrodes in a microemulsion electrolyte solution

Wakisaka, Mitsuru; Kunitake, Masashi

doi:10.1016/j.elecom.2016.01.001

Cited by 32 publications

(28 citation statements)

References 11 publications

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“…Although hydrogen is regarded as an attractive energy carrier, the low energy density of gaseous hydrogen and the resultant necessity of compression or liquefaction for practical storage and conveyance are important challenges. Previously, our group has reported the PEC hydrogenation of toluene (TL) using water as a hydrogen source to synthesize a promising hydrogen carrier, methylcyclohexane (MCH) . This process is based on the reaction shown in Equation (1), and involves a significant Gibbs free energy increase.…”

Section: Figurementioning

confidence: 99%

“…These include an insufficient supply of the reactants (TL and water) to the reaction sites and/or the competitive hydrogen evolution reaction (HER) . The number of active sites on the photocathode surface in such devices is quite limited compared to conventional noble metal electrocatalysts loaded onto porous conductors . Thus, the formation of efficient reactant pathways to connect the aqueous and organic phases with the photocathode surface, at which aqueous and organic reactants can coexist, is also vital.…”

Section: Figurementioning

confidence: 99%

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Sunlight‐Driven Production of Methylcyclohexane from Water and Toluene Using ZnSe : Cu(In,Ga)Se₂‐Based Photocathode

et al. 2019

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A three‐dimensional reaction field composed of a thick, porous TiO2 layer decorated with Pt and an anionic ionomer was fabricated on the surface of a membrane photocathode assembly (MPA). This MPA comprised (ZnSe)0.85(CuIn0.7Ga0.3Se2)0.15 (ZnSe : CIGS) particles that promoted the photoelectrochemical (PEC) production of methylcyclohexane (MCH) from toluene and water. The Pt/TiO2 layer provided selective active sites for MCH production as well as reactant supply pathways. A tandem PEC cell consisting of the Pt/TiO2‐modified ZnSe : CIGS MPA and a photoanode exhibited spontaneous MCH production with a solar‐to‐MCH (STMCH) conversion efficiency as high as 0.32 %. This is the first‐ever report of sunlight‐driven overall MCH production without any assistance of external bias voltages and demonstrates the feasibility of driving this reaction as an artificial photosynthesis.

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Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Sunlight‐Driven Production of Methylcyclohexane from Water and Toluene Using ZnSe : Cu(In,Ga)Se₂‐Based Photocathode

et al. 2019

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“…Organic chemical hydrides are conventionally produced via catalytic hydrogenation of aromatic compounds. Alternatively, aromatic compounds can be electrochemically hydrogenated using a bicontinuous microemulsion (BME), which is an isotropic liquid composed of micro-organic and -aqueous phases (Wakisaka and Kunitake, 2016). BMEs are thermodynamically stabilized by surfactant sometimes with co-surfactant.…”

Section: Introductionmentioning

confidence: 99%

Direct Electrochemical Hydrogenation of Toluene Using a Microbial Electrolysis Cell Containing a Bicontinuous Microemulsion

Tanaka

Oku

Konuma

et al. 2021

J. Chem. Eng. Japan

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The use of microbial electrolysis cells (MECs), which are an extension of microbial fuel cells, is a promising technique for producing H 2 from renewable sources. In this study, we have developed an MEC containing a bicontinuous microemulsion in the cathode chamber, in which methylcyclohexane (MCH) is produced by the electrochemical hydrogenation of toluene. Owing to its relatively high H 2 storage capacity and ease of handling, MCH has attracted considerable attention as an organic chemical hydride, which enables the e cient transportation and storage of H 2 . Despite the complicated chemical composition of the cathode solution, the faradaic e ciency of the toluene/MCH conversion in this study reached 49%. The balance between the toluene/MCH conversion and other competing reactions was found to be sensitive to the electrical potential and current density at the cathode. This new method for the direct production of organic chemical hydrides using microorganisms, which does not require the conventional stepwise process comprising H 2 production and hydrogenation of aromatic compounds, is potentially important for establishing a renewable-energy-based society.

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“…(4) and (5). 15,16 In this system, if toluene is not sufficiently supplied to the cathode catalyst, the hydrogen gas is generated from the adsorbed hydrogen by the following side reaction instead of reaction (5).…”

Section: Introductionmentioning

confidence: 99%

Chemical-hydrogenation Functionalized Flow-Field in Toluene Direct Electro-hydrogenation Electrolyzer for Energy-carrier Synthesis System

Sawaguchi

Nishiki²,

Mitsushima

2018

Electrochemistry

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The toluene-methylcyclohexane organic hydride has been expected to be a candidate of the hydrogen energy carrier system for the effective utilization of renewable energy. We have developed an electrocatalyst for the toluene electro-hydrogenation electrolyzer. However, hydrogen evolution as the side reaction decreases the current efficiency by inhibiting the toluene mass transfer. In this study, we demonstrated the effect of the toluenemethylcyclohexane chemical-hydrogenation by the loading of Pt nanoparticles in the carbon-paper as a porous flow-field. The loaded Pt in the flow-field functioned as the toluene hydrogenation catalyst with the generated hydrogen gas. This simultaneous functioning of chemical-and electro-hydrogenation in the flow-field and the catalyst layer was designed to enhance the overall apparent current efficiency. Based on the electrochemical measurement, the Pt-loaded carbon paper flow-field showed an outstanding enhancement of the current efficiency without a decrease in performance for the Pt loading from 0.5 to 0.02 mg cm −2. The conversion from toluene to methylcyclohexane by a one-through operation of the electrolyzer achieved 92-96% by using the Pt-loaded carbon paper flow-field. Simultaneously, the cell voltage was 1.92 V at 0.4 A cm −2 for a 0.5 mg-Pt cm −2 loaded carbon paperused membrane cathode assembly based on linear sweep voltammetry.

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Direct electrochemical hydrogenation of toluene at Pt electrodes in a microemulsion electrolyte solution

Cited by 32 publications

References 11 publications

Sunlight‐Driven Production of Methylcyclohexane from Water and Toluene Using ZnSe : Cu(In,Ga)Se₂‐Based Photocathode

Sunlight‐Driven Production of Methylcyclohexane from Water and Toluene Using ZnSe : Cu(In,Ga)Se₂‐Based Photocathode

Direct Electrochemical Hydrogenation of Toluene Using a Microbial Electrolysis Cell Containing a Bicontinuous Microemulsion

Chemical-hydrogenation Functionalized Flow-Field in Toluene Direct Electro-hydrogenation Electrolyzer for Energy-carrier Synthesis System

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Direct electrochemical hydrogenation of toluene at Pt electrodes in a microemulsion electrolyte solution

Cited by 32 publications

References 11 publications

Sunlight‐Driven Production of Methylcyclohexane from Water and Toluene Using ZnSe : Cu(In,Ga)Se2‐Based Photocathode

Sunlight‐Driven Production of Methylcyclohexane from Water and Toluene Using ZnSe : Cu(In,Ga)Se2‐Based Photocathode

Direct Electrochemical Hydrogenation of Toluene Using a Microbial Electrolysis Cell Containing a Bicontinuous Microemulsion

Chemical-hydrogenation Functionalized Flow-Field in Toluene Direct Electro-hydrogenation Electrolyzer for Energy-carrier Synthesis System

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Sunlight‐Driven Production of Methylcyclohexane from Water and Toluene Using ZnSe : Cu(In,Ga)Se₂‐Based Photocathode

Sunlight‐Driven Production of Methylcyclohexane from Water and Toluene Using ZnSe : Cu(In,Ga)Se₂‐Based Photocathode