The pH and Potential Dependence of Pb‐Catalyzed Electrochemical CO2 Reduction to Methyl Formate in a Dual Methanol/Water Electrolyte

ChemSusChem ◽  
2022 ◽  
Author(s):  
Dillon T. Hofsommer ◽  
Ying Liang ◽  
Sandesh S. Uttarwar ◽  
Manu Gautam ◽  
Sahar Pishgar ◽  
...  
Keyword(s):  
Methyl Formate ◽  
Co2 Reduction ◽  
Potential Dependence ◽  
Electrochemical Co2 Reduction

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

2019 ◽  
Vol 3 (1) ◽  
pp. 15 ◽  
Author(s):  
Naoki Uemoto ◽  
Mai Furukawa ◽  
Ikki Tateishi ◽  
Hideyuki Katsumata ◽  
Satoshi Kaneco
Keyword(s):  
Carbon Dioxide ◽  
Carbon Black ◽  
Reduction Method ◽  
Methyl Formate ◽  
Metallic Copper ◽  
Co2 Reduction ◽  
Carbon Dioxide Reduction ◽  
Casting Method ◽  
Electrochemical Co2 Reduction ◽  
Carbon Plate

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.

An NADH-Inspired Redox Mediator Strategy to Promote Second-Sphere Electron and Proton Transfer for Cooperative Electrochemical CO2 Reduction Catalyzed by Iron Porphyrin

2020 ◽  
Author(s):  
Peter T. Smith ◽  
Sophia Weng ◽  
Christopher Chang
Keyword(s):  
Proton Transfer ◽  
Co2 Reduction ◽  
Iron Porphyrin ◽  
Redox Mediators ◽  
Reservoir Properties ◽  
Proton Reduction ◽  
Electrochemical Co2 Reduction ◽  
Starting Point ◽  
Rate Improvement ◽  
Molecular Catalysts

We present a bioinspired strategy for enhancing electrochemical carbon dioxide reduction catalysis by cooperative use of base-metal molecular catalysts with intermolecular second-sphere redox mediators that facilitate both electron and proton transfer. Functional synthetic mimics of the biological redox cofactor NADH, which are electrochemically stable and are capable of mediating both electron and proton transfer, can enhance the activity of an iron porphyrin catalyst for electrochemical reduction of CO<sub>2</sub> to CO, achieving a 13-fold rate improvement without altering the intrinsic high selectivity of this catalyst platform for CO<sub>2</sub> versus proton reduction. Evaluation of a systematic series of NADH analogs and redox-inactive control additives with varying proton and electron reservoir properties reveals that both electron and proton transfer contribute to the observed catalytic enhancements. This work establishes that second-sphere dual control of electron and proton inventories is a viable design strategy for developing more effective electrocatalysts for CO<sub>2</sub> reduction, providing a starting point for broader applications of this approach to other multi-electron, multi-proton transformations.

Facet Dependent Reactivity of Copper Nanocrystals for Electrochemical CO2 Reduction to Valuable Products

2019 ◽  
Author(s):  
Pranit Iyengar ◽  
Gian Luca De Gregorio ◽  
Raffaella Buonsanti
Keyword(s):  
Co2 Reduction ◽  
Electrochemical Co2 Reduction

Nanoporous Au-Sn with solute strain for simultaneously enhanced selectivity and durability during electrochemical CO2 reduction

2020 ◽  
Vol 43 ◽  
pp. 154-160 ◽  
Author(s):  
Xianglong Lu ◽  
Tianshui Yu ◽  
Hailing Wang ◽  
Lihua Qian ◽  
Ruichun Luo ◽  
...  
Keyword(s):  
Co2 Reduction ◽  
Electrochemical Co2 Reduction ◽  
Enhanced Selectivity

scholarly journals Investigation of Gas Diffusion Electrode Systems for the Electrochemical CO2 Conversion

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 482
Author(s):  
Hilmar Guzmán ◽  
Federica Zammillo ◽  
Daniela Roldán ◽  
Camilla Galletti ◽  
Nunzio Russo ◽  
...  
Keyword(s):  
Carbon Capture ◽  
Active Sites ◽  
Co2 Reduction ◽  
Gas Diffusion ◽  
Gas Diffusion Electrode ◽  
Catalyst Loading ◽  
Co2 Conversion ◽  
Atmospheric Conditions ◽  
Electrochemical Co2 Reduction ◽  
Liquid Products

Electrochemical CO2 reduction is a promising carbon capture and utilisation technology. Herein, a continuous flow gas diffusion electrode (GDE)-cell configuration has been studied to convert CO2 via electrochemical reduction under atmospheric conditions. To this purpose, Cu-based electrocatalysts immobilised on a porous and conductive GDE have been tested. Many system variables have been evaluated to find the most promising conditions able to lead to increased production of CO2 reduction liquid products, specifically: applied potentials, catalyst loading, Nafion content, KHCO3 electrolyte concentration, and the presence of metal oxides, like ZnO or/and Al2O3. In particular, the CO productivity increased at the lowest Nafion content of 15%, leading to syngas with an H2/CO ratio of ~1. Meanwhile, at the highest Nafion content (45%), C2+ products formation has been increased, and the CO selectivity has been decreased by 80%. The reported results revealed that the liquid crossover through the GDE highly impacts CO2 diffusion to the catalyst active sites, thus reducing the CO2 conversion efficiency. Through mathematical modelling, it has been confirmed that the increase of the local pH, coupled to the electrode-wetting, promotes the formation of bicarbonate species that deactivate the catalysts surface, hindering the mechanisms for the C2+ liquid products generation. These results want to shine the spotlight on kinetics and transport limitations, shifting the focus from catalytic activity of materials to other involved factors.

Insight into the Active Site in Electrochemical CO2 Reduction of Self-Supported Cobalt Phthalocyanine Anchored on ZnIn2S4 Nanoarrays

2021 ◽  
Author(s):  
Hong-Lin Zhu ◽  
Lin-Chang Liu ◽  
Zhong-Yi Li ◽  
Jing-Jing Ma ◽  
Yue-Qing Zheng ◽  
...  
Keyword(s):  
Active Site ◽  
Co2 Reduction ◽  
Cobalt Phthalocyanine ◽  
Electrochemical Co2 Reduction ◽  
Insight Into

Effects of Appended Poly(ethylene glycol) on Electrochemical CO2 Reduction by an Iron Porphyrin Complex

2021 ◽  
Vol 60 (6) ◽  
pp. 3843-3850
Author(s):  
Ashwin Chaturvedi ◽  
Caroline K. Williams ◽  
Nilakshi Devi ◽  
Jianbing “Jimmy” Jiang
Keyword(s):  
Ethylene Glycol ◽  
Co2 Reduction ◽  
Iron Porphyrin ◽  
Poly Ethylene Glycol ◽  
Porphyrin Complex ◽  
Electrochemical Co2 Reduction ◽  
Poly Ethylene

scholarly journals Polyoxometalates as electron and proton reservoir assist electrochemical CO2 reduction

APL Materials ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 120702
Author(s):  
Zhongling Lang ◽  
Jun Miao ◽  
Yangchun Lan ◽  
Jiaji Cheng ◽  
Xiaoqian Xu ◽  
...  
Keyword(s):  
Co2 Reduction ◽  
Electrochemical Co2 Reduction
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