2015
DOI: 10.1039/c5cp03283k
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Effects of electrolyte, catalyst, and membrane composition and operating conditions on the performance of solar-driven electrochemical reduction of carbon dioxide

Abstract: Solar-driven electrochemical cells can be used to convert carbon dioxide, water, and sunlight into transportation fuels or into precursors to such fuels. The voltage efficiency of such devices depends on the (i) physical properties of its components (catalysts, electrolyte, and membrane); (ii) operating conditions (carbon dioxide flowrate and pressure, current density); and (iii) physical dimensions of the cell. The sources of energy loss in a carbon dioxide reduction (CO2R) cell are the anode and cathode over… Show more

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Cited by 355 publications
(506 citation statements)
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“…Conversely, these observations suggest that there is a second mode of CO 2 depletion that becomes relevant at potentials cathodic of −1 V vs RHE at scan rates below 20 mV/ s. This additional mode of CO 2 depletion is hypothesized to be the reaction of CO 2 with hydroxyl anions evolved at the cathode surface, which produces bicarbonate anions and depletes the local CO 2 concentration. 6,7 The extent to which this reaction depletes the local CO 2 concentration scales with the concentration of hydroxyl anions produced at the cathode surface during the linear potential sweep, which decreases as the scan rate increases. It is important to realize that the intrinsic electrocatalytic activity can only be measured if the extent of concentration polarization is minimized.…”
Section: Journal Of the American Chemical Societymentioning
confidence: 99%
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“…Conversely, these observations suggest that there is a second mode of CO 2 depletion that becomes relevant at potentials cathodic of −1 V vs RHE at scan rates below 20 mV/ s. This additional mode of CO 2 depletion is hypothesized to be the reaction of CO 2 with hydroxyl anions evolved at the cathode surface, which produces bicarbonate anions and depletes the local CO 2 concentration. 6,7 The extent to which this reaction depletes the local CO 2 concentration scales with the concentration of hydroxyl anions produced at the cathode surface during the linear potential sweep, which decreases as the scan rate increases. It is important to realize that the intrinsic electrocatalytic activity can only be measured if the extent of concentration polarization is minimized.…”
Section: Journal Of the American Chemical Societymentioning
confidence: 99%
“…As the hydrodynamic boundary layer thickness increases, the local pH should increase at a fixed current density, leading to CO 2 depletion by acid−base reaction at more anodic potentials. 7 To validate this hypothesis, the mass-ion current signal associated with CO 2 was plotted as a function of the deconvoluted massion current signal associated with CO for each linear potential sweep performed. Figure 5B shows that as the electrolyte flow rate is increased, the point at which the CO 2 signal rapidly declines shifts to higher CO evolution rates, which correspond to increasingly cathodic potentials.…”
Section: Journal Of the American Chemical Societymentioning
confidence: 99%
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“…28,29 Even modest current densities cause the pH and CO 2 concentration near the cathode surface to vary significantly from that in the bulk electrolyte. 30,31 The magnitude of the concentration gradients depends largely on the hydrodynamics of the electrochemical cell. As a result, the electrolyte needs to be mixed vigorously to ensure sufficient mass transport to and from the cathode.…”
Section: Impact Of Electrochemical Cell Hydrodynamics On Electrocmentioning
confidence: 99%
“…[19][20][21][22] In order to drive progress in the CO2R electrocatalysis community, commonly accepted, easily reproducible testing conditions need to be established, 23 similar to those suggested for photoelectrochemical water splitting. 24 Hori and co-workers have already identified many good practices for experimentation in this area 10,13,25,26 and some further insight into polarization losses was provided by Singh et al 27 However, examining the recent literature, one can observe that several different methods of analyzing CO2R electrocatalysts have been used which employ different cell designs and testing conditions.…”
Section: Introductionmentioning
confidence: 99%