Photoelectrochemical Reduction of CO<sub>2</sub>in Methanol with TiO<sub>2</sub>Photoanode and Metal Cathode

Yamamoto, Tatsuhiko; Katsumata, Hideyuki; Suzuki, Tohru; Kaneco, Satoshi

doi:10.1149/07550.0031ecst

Cited by 13 publications

(7 citation statements)

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“…Whereas a FE of 13 % for HCOOCH3, 61 % for CO, and 3.3 % of H2 was achieved with Ag as cathode [43]. Showing that electrode material can be utilised to change the main product (Pg cathode for formic acid to CO with Ag cathode) Despite the configuration in the present work being different the FE's for CO are quite similar to the ones observed in the literature.…”

Section: Photoelectrocatalytic Reduction Of Co2supporting

confidence: 83%

“…Finally, at the electrocatalytic cathode in the gas phase compartment, the protons and electrons react with the CO2 and generate products [6,46]. In this work, similarly to the mechanism described by Yamamoto et al [43], when the TiNT photoanode is irradiated photogenerated electrons and protons are produced from the oxidation reactions. These are then transported to the cathodic gas chamber through the membrane, with help of the applied bias.…”

Section: Photoelectrocatalytic Reduction Of Co2mentioning

confidence: 57%

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Photoelectrochemical reduction of CO2 with TiNT

Cortés

McMichael

Hamilton

et al. 2020

Materials Science in Semiconductor Processing

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In order to reduce CO2 emissions and utilise CO2 as a useful by-product, artificial photosynthesis is being explored for carbon capture and utilisation. Semiconductor photocatalysts excited by solar energy may be used to convert CO2 to fuels or useful chemicals, e.g. CO, CH4, CH3OH. The photocatalytic reduction of CO2 to useful products has been widely studied in order to overcome the greenhouse effect and the current energy necessities. However, this reaction has proved to be extremely low efficiency when compared to other processes. In order to improve these yields, photoelectrochemical reduction of CO2 has been considered, since it combines photocatalysis and electrocatalysis. To this end, a two compartment photoelectrochemical cell (PEC) has been designed and fabricated for the reduction of CO2. This custom built reactor consists of dual phases, where gas phase CO2 is feed into the cathode comparement and an aqueous phase in the anode compartment. The anode and cathodes for a sandwich were the anode perforated foil on exposing aligned titania nanotubes to electrolyte bonded to nafion; which forms a bridge to Pt deposited carbon cloth cathode electrode in gas phase compartment. CO2 reduction products were detected with GC connected to the reactor. The PEC reactor improved the yield and the formal quantum efficiency compared to our previous studies using photocatalytic reactors.

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Section: Photoelectrocatalytic Reduction Of Co2supporting

confidence: 83%

Section: Photoelectrocatalytic Reduction Of Co2mentioning

confidence: 57%

Photoelectrochemical reduction of CO2 with TiNT

Cortés

McMichael

Hamilton

et al. 2020

Materials Science in Semiconductor Processing

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“…The Faradaic efficiencies for methane and ethylene were similar or better than those obtained with previous works. The reason could not be clarified, and it maybe seems due to the enhancement of the electron transfer mobility [3][4][5][6][7][8][9][11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Reaction Mechanismmentioning

confidence: 99%

“…Therefore, it is very significant to decrease the atmospheric CO 2 concentration, and a promising approach is a C-based fuel technique, which is obtained from abundant sources containing CO 2 by applying the renewable energy as energy input. The electrochemical CO 2 reduction appears to be one potential of the most important methods for the CO 2 conversion, because of its simplicity, environmental friendliness, and low cost [3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Carbon Dioxide Reduction in Methanol at Cu and Cu2O-Deposited Carbon Black Electrodes

et al. 2019

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The electrochemical reduction of carbon dioxide in methanol was investigated with Cu and Cu2O-supported carbon black (Vulcan XC-72) nanoparticle electrodes. Herein, Cu or a Cu2O-deposited carbon black catalyst has been synthesized by the reduction method for a Cu ion, and the drop-casting method was applied for the fabrication of a modified carbon black electrode. A catalyst ink solution was fabricated by dispersing the catalyst particles, and the catalyst ink was added onto the carbon plate. The pH of suspension was effective for controlling the Cu species for the metallic copper and the Cu2O species deposited on the carbon black. Without the deposition of Cu, only CO and methyl formate were produced in the electrochemical CO2 reduction, and the production of hydrocarbons could be scarcely observed. In contrast, hydrocarbons were formed by using Cu or Cu2O-deposited carbon black electrodes. The maximum Faraday efficiency of hydrocarbons was 40.3% (26.9% of methane and 13.4% of ethylene) at −1.9 V on the Cu2O-deposited carbon black catalyst. On the contrary, hydrogen evolution could be depressed to 34.7% under the condition.

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“…Electrochemical reduction of waste CO 2 is an attractive route to the synthesis of valuable fuels and chemicals while simultaneously decreasing harmful greenhouse gas emissions. , CO 2 reduction (CO 2 R) in methanol is particularly interesting due to the high solubility of CO 2 (∼160 mM in methanol compared to 38 mM in water at ambient conditions) and the changes to selectivity which arise from the solvent properties. In particular, methanol-based CO 2 R allows for the production of methyl formate, a product not formed in aqueous CO 2 electroreduction. − Among a number of industrial applications, methyl formate is commonly used as a solvent, as a replacement for greenhouse gases such as chlorofluorocarbons, as a chemical precursor to formamides, and as a component of quick-dry stains and foams. Methyl formate is a highly volatile (boiling point, BP = 32 °C) liquid product, so it is more easily separated from the postelectrolysis solvent than more common formyl products like formate and formic acid (BP = 101 °C).…”

Section: Introductionmentioning

confidence: 99%

Prolonged Stability of Pb-Catalyzed CO₂ Electroreduction to Methyl Formate in Acidic Methanol

Hofsommer

Gautam

Uttarwar

et al. 2023

ACS Appl. Energy Mater.

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Electrochemical CO 2 reduction from renewable energy is a promising route to mitigate greenhouse gas emissions from waste sources while generating value-added products. CO 2 electroreduction in methanol is particularly interesting due to the increased CO 2 solubility compared to water and the propensity to form methyl formate, a product absent in aqueous electrolysis. Four factors have been identified as critical to achieving prolonged high selectivity for methyl formate production on a Pb cathode in methanol: high pH near the electrode, low bulk pH, low water content, and regeneration of Pb 2+ sites. Increasing concentration of the formic acid product was observed to induce a selectivity shift toward hydrogen, which was mitigated by the in situ conversion of the formic acid to methyl formate via an esterification reaction. Furthermore, co-electrolysis of CO 2 with dilute molecular oxygen (4% O 2 ) led to Pb catalyst repair through in situ surface oxidation. Using CO 2 and dilute O 2 along with single-pass catholyte flow to maintain a low formic acid concentration, sustained high selectivity for methyl formate was attained at ∼60% faradaic efficiency at −20 mA cm −2 for over 72 h.

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Photoelectrochemical Reduction of CO₂in Methanol with TiO₂Photoanode and Metal Cathode

Cited by 13 publications

References 5 publications

Photoelectrochemical reduction of CO2 with TiNT

Photoelectrochemical reduction of CO2 with TiNT

Electrochemical Carbon Dioxide Reduction in Methanol at Cu and Cu2O-Deposited Carbon Black Electrodes

Prolonged Stability of Pb-Catalyzed CO₂ Electroreduction to Methyl Formate in Acidic Methanol

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Photoelectrochemical Reduction of CO2in Methanol with TiO2Photoanode and Metal Cathode

Cited by 13 publications

References 5 publications

Photoelectrochemical reduction of CO2 with TiNT

Photoelectrochemical reduction of CO2 with TiNT

Electrochemical Carbon Dioxide Reduction in Methanol at Cu and Cu2O-Deposited Carbon Black Electrodes

Prolonged Stability of Pb-Catalyzed CO2 Electroreduction to Methyl Formate in Acidic Methanol

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Photoelectrochemical Reduction of CO₂in Methanol with TiO₂Photoanode and Metal Cathode

Prolonged Stability of Pb-Catalyzed CO₂ Electroreduction to Methyl Formate in Acidic Methanol