Impurity Ion Complexation Enhances Carbon Dioxide Reduction Catalysis

Wuttig, Anna; Surendranath, Yogesh

doi:10.1021/acscatal.5b00808

Cited by 236 publications

(310 citation statements)

References 54 publications

(103 reference statements)

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“…Since CO 2 RR usually takes place at highly cathodic potentials, transition metal ions (such as Fe 3+ , Ni 2+ , Cu 2+ , and so on) in the electrolyte even at 5 ppm can be electrodeposited onto the working electrode during CO 2 RR and unexpectedly contaminate the working electrode . To remedy this problem, the electrolyte is usually pre‐electrolyzed to lower the concentration of transition metal ions or added with, for example, metal chelator ethylenediaminetetraacetic acid to block the deposition of these impurities onto the working electrode …”

Section: Fundamentals Of Electrochemical Co2 Reductionmentioning

confidence: 99%

Promises of Main Group Metal–Based Nanostructured Materials for Electrochemical CO₂ Reduction to Formate

Han

Pan

et al. 2019

Advanced Energy Materials

472

384

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Selective CO2 reduction to formic acid or formate is the most technologically and economically viable approach to realize electrochemical CO2 valorization. Main group metal–based (Sn, Bi, In, Pb, and Sb) nanostructured materials hold great promise, but are still confronted with several challenges. Here, the current status, challenges, and future opportunities of main group metal–based nanostructured materials for electrochemical CO2 reduction to formate are reviewed. Firstly, the fundamentals of electrochemical CO2 reduction are presented, including the technoeconomic viability of different products, possible reaction pathways, standard experimental procedure, and performance figures of merit. This is then followed by detailed discussions about different types of main group metal–based electrocatalyst materials, with an emphasis on underlying material design principles for promoting the reaction activity, selectivity, and stability. Subsequently, recent efforts on flow cells and membrane electrode assembly cells are reviewed so as to promote the current density as well as mechanistic studies using in situ characterization techniques. To conclude a short perspective is offered about the future opportunities and directions of this exciting field.

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Section: Fundamentals Of Electrochemical Co2 Reductionmentioning

confidence: 99%

Promises of Main Group Metal–Based Nanostructured Materials for Electrochemical CO₂ Reduction to Formate

Han

Pan

et al. 2019

Advanced Energy Materials

472

384

View full text Add to dashboard Cite

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“…The electrolyte was CO 2 -saturated 0.1 M NaHCO 3 (pH 6.75), which had been treated with an ion exchange resin (Chelex) to minimize the concentration of transition metal impurities 19,20 . Prior to polarization at the stated potential, the samples were subjected to a cathodic current of −2.0 mA cm…”

Section: Electrochemical Performancementioning

confidence: 99%

“…Numerous Earth-abundant catalysts have been developed for the OER, most of them consisting of transition metals such as Ni and Fe, which are prone to dissolve and redeposit on the CO 2 reducing cathode. This leads to poisoning of the electrode 19 , a problem that may be averted by avoiding the use of elements foreign to the cathode. We therefore decided to investigate OER electrodes that are made from the same elements as the cathode, leading to a bifunctional catalyst configuration that has the additional benefit of making the device simpler and more cost effective.…”

Section: Bifunctional Catalysismentioning

confidence: 99%

Solar conversion of CO2 to CO using Earth-abundant electrocatalysts prepared by atomic layer modification of CuO

et al. 2017

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The solar-driven electrochemical reduction of CO 2 to fuels and chemicals provides a promising way for closing the anthropogenic carbon cycle. However, the lack of selective and Earth-abundant catalysts able to achieve the desired transformation reactions in an aqueous matrix presents a substantial impediment as of today. Here we introduce atomic layer deposition of SnO 2 on CuO nanowires as a means for changing the wide product distribution of CuO-derived CO 2 reduction electrocatalysts to yield predominantly CO. The activity of this catalyst towards oxygen evolution enables us to use it both as the cathode and anode for complete CO 2 electrolysis. In the resulting device, the electrodes are separated by a bipolar membrane, allowing each half-reaction to run in its optimal electrolyte environment. Using a GaInP/GaInAs/Ge photovoltaic we achieve the solar-driven splitting of CO 2 into CO and oxygen with a bifunctional, sustainable and all Earth-abundant system at an e ciency of 13.4%.T he electrochemical reduction of CO 2 to fuels and chemicals has the promise to provide a versatile way of storing renewable electrical energy in chemical bonds while simultaneously closing the anthropogenic carbon cycle. A number of products have been successfully synthesized by this process, most notably carbon monoxide (CO) 1-3 , formic acid (HCOOH), methane (CH 4 ) 4 , ethylene (C 2 H 4 ) 5 and ethanol (CH 3 CH 2 OH) 6 , as well as other compounds 7,8 . Due to the numerous possible reaction pathways, selectively targeting one specific product at high yield has remained a challenge, which, to the present day, has been achieved only for CO and formic acid in aqueous electrolytes. Unfortunately, selective electroreduction of CO 2 to these products relies on the use of precious metals (Au, Ag, Pd) [9][10][11][12] , requires operation at considerable overpotentials 13 , or requires the use of electrolyte additives, such as ionic liquids 14 . Developing inexpensive, selective and stable catalysts operating at low overpotentials is therefore a crucial requirement.Recently, substantial progress toward decreasing the overpotential of copper-based electrodes was made by employing catalysts derived from copper oxides 15 . However, the insufficient selectivity remained an issue, with the catalyst producing CO, H 2 and formic acid at comparable selectivities. Following up on this work, it was demonstrated that by electrochemically reducing copper oxide in the presence of indium ions, the selectivity toward producing CO could be substantially enhanced 16,17 . More recently, the same group demonstrated tin to have a similar effect 18 . Although adding sources of metal ions during the catalyst reduction process is effective in tuning the selectivity, it is difficult to control and may not guarantee uniform coating.Here, we demonstrate the surface modification of CuO nanowire electrodes with SnO 2 using atomic layer deposition (ALD), leading to a highly selective catalyst for the electrochemical reduction of CO 2 to CO. By using SnO 2 -modified...

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“…Consequently, it seems that predicting how hydrocarbons are formed at Cu‐based electrodes is more complicated than simply using CO heat of adsorption (Figure ). Indeed, hydrocarbon evolution studies have shown that even a tiny fraction of secondary metals can be catastrophic to the hydrocarbon evolution ability of a copper electrode . This factor makes the exploration of alloys for hydrocarbon evolution much more challenging.…”

Section: Co2→c2 With Electrocatalytic Alloysmentioning

confidence: 99%

Electrocatalytic Alloys for CO₂ Reduction

et al. 2017

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Electrochemically reducing CO2 using renewable energy is a contemporary global challenge that will only be met with electrocatalysts capable of efficiently converting CO2 into fuels and chemicals with high selectivity. Although many different metals and morphologies have been tested for CO2 electrocatalysis over the last several decades, relatively limited attention has been committed to the study of alloys for this application. Alloying is a promising method to tailor the geometric and electric environments of active sites. The parameter space for discovering new alloys for CO2 electrocatalysis is particularly large because of the myriad products that can be formed during CO2 reduction. In this Minireview, mixed‐metal electrocatalyst compositions that have been evaluated for CO2 reduction are summarized. A distillation of the structure–property relationships gleaned from this survey are intended to help in the construction of guidelines for discovering new classes of alloys for the CO2 reduction reaction.

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Impurity Ion Complexation Enhances Carbon Dioxide Reduction Catalysis

Cited by 236 publications

References 54 publications

Promises of Main Group Metal–Based Nanostructured Materials for Electrochemical CO₂ Reduction to Formate

Promises of Main Group Metal–Based Nanostructured Materials for Electrochemical CO₂ Reduction to Formate

Solar conversion of CO2 to CO using Earth-abundant electrocatalysts prepared by atomic layer modification of CuO

Electrocatalytic Alloys for CO₂ Reduction

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Impurity Ion Complexation Enhances Carbon Dioxide Reduction Catalysis

Cited by 236 publications

References 54 publications

Promises of Main Group Metal–Based Nanostructured Materials for Electrochemical CO2 Reduction to Formate

Promises of Main Group Metal–Based Nanostructured Materials for Electrochemical CO2 Reduction to Formate

Solar conversion of CO2 to CO using Earth-abundant electrocatalysts prepared by atomic layer modification of CuO

Electrocatalytic Alloys for CO2 Reduction

Contact Info

Product

Resources

About

Promises of Main Group Metal–Based Nanostructured Materials for Electrochemical CO₂ Reduction to Formate

Promises of Main Group Metal–Based Nanostructured Materials for Electrochemical CO₂ Reduction to Formate

Electrocatalytic Alloys for CO₂ Reduction