Effect of partial pressure on product selectivity in Cu-catalyzed electrochemical reduction of CO<sub>2</sub>

Moradzaman, Mozhgan; Sánchez-Martínez, Carlos; Mul, Guido

doi:10.1039/d0se00865f

Cited by 19 publications

(22 citation statements)

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“…The observations for the formation of ethylene at potentials more negative than -0.8 V are very similar to observed by varying the partial pressure of CO2 in inert balance gas 70 , also showing an optimum in FE of ethylene at PCO2 ~ 0.5 atm, see Fig. 3a.…”

Section: Chaptersupporting

confidence: 81%

“…Secondly, the higher active surface area of the roughened electrode leads to higher current densities and consequently, an increase in local pH, which is known to alter the reaction pathway towards formation of ethylene 70,80,[147][148] . The rise of local pH at high current densities occurs due to fast proton consumption at the surface.…”

Section: Effect Of Cu Salt Additive On Selectivity and Activitymentioning

confidence: 99%

“…In our previous study, we studied the effect of CO2 partial pressure (PCO2) on CO2RR using oxide-derived copper electrodes 70 and reported improved ethylene formation by decreasing PCO2. So far, however, there is little published data on the performance of such electrodes in the reduction of CO/CO2 gas mixtures [71][72] .…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical reduction of CO2 to ethylene : spectroscopic evaluation of copper electrodes

Moradzaman

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The research in this thesis was performed in the PhotoCatalytic Synthesis group within the faculty of Science and Technology, and the MESA+ Institute for Nanotechnology at the University of Twente. This research was financed by the Solar to Products project 733.000.008 "Electrochemical reduction of CO2 to ethylene" of the Netherlands Organization for Scientific Research (NWO). ELECTROCHEMICAL REDUCTION OF CO2 TO ETHYLENE - SPECTROSCOPIC EVALUATION OF COPPER ELECTRODES

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Section: Chaptersupporting

confidence: 81%

Section: Effect Of Cu Salt Additive On Selectivity and Activitymentioning

confidence: 99%

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Electrochemical reduction of CO2 to ethylene : spectroscopic evaluation of copper electrodes

Moradzaman

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“… 95 Interestingly, the production of HCOOH acquired a notable difference in the current density, overpotential, and FE or selectivity when the CO 2 R reaction was changed from the liquid phase to gas phase electrolysis. 96 Based on the above discussions and prior observations, 97 it is understood that the product selectivity can be highly tailored by the partial pressure of CO 2 and components (GDE, MEA, membrane, etc. ) of the electrolyzer.…”

Section: Selectivity Of Co 2 Electrolyzersmentioning

confidence: 85%

The inchoate horizon of electrolyzer designs, membranes and catalysts towards highly efficient electrochemical reduction of CO₂ to formic acid

2022

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“…Detailed characterization of the cuprous oxide electrodes is presented in a previous study. 15 After preparation, XRD analysis shows the formation of Cu 2 O and reduction to metallic Cu after electrochemical reduction of CO 2 . A rough surface is obtained consisting of pyramidal shapes, based on SEM analysis.…”

Section: Methodsmentioning

confidence: 99%

Optimizing CO Coverage on Rough Copper Electrodes: Effect of the Partial Pressure of CO and Electrolyte Anions (pH) on Selectivity toward Ethylene

Moradzaman

Mul

2021

J. Phys. Chem. C

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The conversion of the initial intermediate CO in the electrochemical reduction reaction of CO 2 on the surface of oxide-derived Cu electrodes has been investigated as a function of partial pressure and pH, manipulated by the composition of the electrolyte. We show that in inert gas, an increase in partial pressure of CO results in a continuous increase in Faradaic efficiency (FE) for ethylene, at various potentials ranging from −0.7 to −1.1 V versus RHE, with the highest FE of ∼28% obtained using 1 bar CO at −0.8 V. When the partial pressure of CO is increased in a mixture of CO and CO 2 , an optimum in the ethylene FE was found for the partial pressure of CO in the range from 0.5 bar (at −1.1 V, FE is ∼45%) to 0.8 bar (at −0.9 V, FE is ∼35%). At lower negative potentials (−0.8 to −0.7 V), the presence of CO 2 has negligible influence, and similar data to reduction of CO in inert gas were obtained. Variation of the anion in solution (0.1 M concentration) shows that the optimized FE toward ethylene increases from 5.2% in KH 2 PO 4 to 43.2% in KOH. The observed differences in selectivity are attributed to anion buffering capacity and the associated local pH near the surface of the electrode. Using in situ attenuated total reflection surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS), it was determined that the CO coverage increases as a function of increasing pH, confirming that CO coverage and pH correlate. Collectively, the data herein outline the critical role of reactant partial pressures and the significant effect of anion composition (pH) on the surface coverage of CO and concomitant selectivity in electrochemical reduction of CO 2 to ethylene.

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Effect of partial pressure on product selectivity in Cu-catalyzed electrochemical reduction of CO₂

Abstract: The influence of CO2 partial pressure on electrochemical reduction of CO2 using oxide-derived electrodeposited copper surfaces in a conventional two compartment cell configuration, is discussed. Contrary to what has been...

Cited by 19 publications

References 29 publications

Electrochemical reduction of CO2 to ethylene : spectroscopic evaluation of copper electrodes

Electrochemical reduction of CO2 to ethylene : spectroscopic evaluation of copper electrodes

The inchoate horizon of electrolyzer designs, membranes and catalysts towards highly efficient electrochemical reduction of CO₂ to formic acid

Optimizing CO Coverage on Rough Copper Electrodes: Effect of the Partial Pressure of CO and Electrolyte Anions (pH) on Selectivity toward Ethylene

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Effect of partial pressure on product selectivity in Cu-catalyzed electrochemical reduction of CO2

Abstract: The influence of CO2 partial pressure on electrochemical reduction of CO2 using oxide-derived electrodeposited copper surfaces in a conventional two compartment cell configuration, is discussed. Contrary to what has been...

Cited by 19 publications

References 29 publications

Electrochemical reduction of CO2 to ethylene : spectroscopic evaluation of copper electrodes

Electrochemical reduction of CO2 to ethylene : spectroscopic evaluation of copper electrodes

The inchoate horizon of electrolyzer designs, membranes and catalysts towards highly efficient electrochemical reduction of CO2 to formic acid

Optimizing CO Coverage on Rough Copper Electrodes: Effect of the Partial Pressure of CO and Electrolyte Anions (pH) on Selectivity toward Ethylene

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Effect of partial pressure on product selectivity in Cu-catalyzed electrochemical reduction of CO₂

The inchoate horizon of electrolyzer designs, membranes and catalysts towards highly efficient electrochemical reduction of CO₂ to formic acid