Syngas production from electrochemical reduction of CO<sub>2</sub>: current status and prospective implementation

Hernández, Simelys; Farkhondehfal, M. Amin; Sastre, Francesc; Makkee, Michiel; Saracco, Guido; Russo, Nunzio

doi:10.1039/c7gc00398f

Cited by 311 publications

(245 citation statements)

References 113 publications

(169 reference statements)

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“…As shown in Figure , Cu‐5 displays a superior selectivity for the CO and consequently a lower H 2 /CO ratio. At all investigated potentials, the H 2 /CO ratio is between 1 and 2 on the Cu‐5, which is ideal for the further synthesis of methanol . By comparison with the other samples Cu‐1 and Cu‐3, increasing the Cu 2 O content in the as‐prepared catalysts increases the CO selectivity at each potential.…”

Section: Resultsmentioning

confidence: 99%

Microwave‐Assisted Synthesis of Copper‐Based Electrocatalysts for Converting Carbon Dioxide to Tunable Syngas

et al. 2020

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Copper (Cu)‐based materials for efficient CO2 conversion to adjustable syngas are reported. We employ an energy‐efficient microwave‐assisted route to synthesize copper/copper oxides with different structures and morphologies. The initial oxidation state of the copper on the surface significantly influences the performance of the materials in the CO2 reduction reaction (CO2RR). On the as‐prepared material surface, a high content of Cu2O improves the selectivity toward CO and consequently the catalyzed CO2RR produce a syngas with a low H2/CO ratio, while the CuO performs poorly. In particular, Cu2O particles with a cubic shape show the highest selectivity for the CO formation. The superior catalytic activity of the Cu2O cubes for the CO2RR is attributed to the surface roughening under potential, which offers abundant electrochemically active sites and facilitates mass transport.

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Section: Resultsmentioning

confidence: 99%

Microwave‐Assisted Synthesis of Copper‐Based Electrocatalysts for Converting Carbon Dioxide to Tunable Syngas

et al. 2020

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“…The product gas output of the CO 2 RR process with Au–Pd/C is a mixture of CO and H 2 , with the ratio mostly depending on the applied cathodic potential. This mixture can be used to make syngas for industrial use . The main advantage is the high FE for CO as it is the only product of CO 2 RR, with a high CD.…”

Section: Resultsmentioning

confidence: 99%

“…Pd L 3 ‐edge XANES investigation was performed to elucidate the oxidation states of Pd in Au–Pd/C and Pd/C. An investigation on the L‐edges is more suitable to probe changes in the oxidation state, as the respective 2p → 4d transition allows direct detection of the unoccupied 4d states near the Fermi level . X‐ray absorption spectroscopy (XAS) measurements were made on the SXRMB beamline of Canadian Light Source.…”

Section: Methodsmentioning

confidence: 99%

A Gold–Palladium Nanoparticle Alloy Catalyst for CO Production from CO₂ Electroreduction

et al. 2019

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Electrochemical CO2 reduction reaction (CO2RR) is a promising technology for combining CO2 reutilization and renewable electricity storage. For economic feasibility, better catalysts are required to overcome current limitations such as high overpotentials, poor faradaic efficiencies (FEs), and low current densities. Herein, size‐ and composition‐controlled gold (Au)–palladium (Pd) bimetallic alloy nanoparticles prepared by a metal vapor synthesis technique together with the monometallic Au and Pd equivalent materials are investigated. X‐ray diffraction and high‐angle annular dark‐field scanning transmission electron microscopy energy‐dispersive X‐ray spectroscopy analyses confirm the Au–Pd alloy formation with an average atomic ratio of 76 Pd wt% and 24 Au wt%. These bimetallic and the monometallic catalysts are characterized and tested for the electroreduction of CO2 in electrochemical cells and also in a complete CO2 electrolysis cell. Analysis of the reduction products shows a 100% CO2RR selectivity for CO. The FE for CO with respect to H2 as high as 90% is obtained with Au–Pd/C by tuning the electrode structure. The Au/C and Pd/C catalysts also show a better selectivity for CO with no evidence of other CO2RR products. The Au–Pd alloy formation improves the FE of Pd for CO by suppressing the parasitic H2 evolution reaction.

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“…Addition of a suitably low concentration of water (e. g. 0.3 M) to the acetonitrile medium provids a proton source which significantly enhanced the catalytic current. [17] The mechanism of CO 2 reduction in a low protic organic medium involves the formation of CO 2 radical anions (CO 2 À ) on the surface of the catalyst as the rate determining step. Consequently, acetonitrile electrolyte solution containing 0.3 M water was used as the medium to achieve enhanced CO 2 reduction catalytic current with controllable proton availability.…”

Section: Concs With Size Controllable Co Nps Derived From Co-tcnq Andmentioning

confidence: 99%

Size Controllable Metal Nanoparticles Anchored on Nitrogen Doped Carbon for Electrocatalytic Energy Conversion

et al. 2019

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Metal nanoparticles (NPs) are an important class of materials for electrocatalysis. Synthesis of metal NPs with uniform particle size below 10 nm without a capping agent is challenging due to the tendency of particle aggregation to minimize surface energy. Here we demonstrate that pyrolysis of a metal-TCNQ (TCNQ À = tetracyanoquinodimethane radical anion) compound can produce metal NPs with controllable particle sizes anchored on nitrogen doped carbon (denoted as MetalNC). NiNC and CoNC derived from Ni-TCNQ and Co-TCNQ with Ni and Co particle sizes below 10 nm were successfully prepared. NiNC, with a particle size of 8.8 nm, showed excellent catalytic activity for hydrogen evolution in an alkaline medium, reaching a catalytic current density of 10 mA cm À 2 at an overpotential of 230 mV. CoNC, with a particle size of 1.8 nm, exhibited the capability of producing syngas by electrocatalytic CO 2 reduction over a wide potential range in an acetonitrile medium containing 0.3 M H 2 O. An artificial photosynthesis system based on CoNC achieved faradaic efficiencies of over 70 % for production of syngas and 22 % for formate. This work demonstrates a general strategy to synthesize size controllable metal NPs supported on carbon materials for electrocatalytic energy conversion.

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Syngas production from electrochemical reduction of CO₂: current status and prospective implementation

Abstract: The opportunities and challenges for exploiting the production of syngas from the electrochemical reduction of CO2are critically reviewed and analysed.

Cited by 311 publications

References 113 publications

Microwave‐Assisted Synthesis of Copper‐Based Electrocatalysts for Converting Carbon Dioxide to Tunable Syngas

Microwave‐Assisted Synthesis of Copper‐Based Electrocatalysts for Converting Carbon Dioxide to Tunable Syngas

A Gold–Palladium Nanoparticle Alloy Catalyst for CO Production from CO₂ Electroreduction

Size Controllable Metal Nanoparticles Anchored on Nitrogen Doped Carbon for Electrocatalytic Energy Conversion

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Syngas production from electrochemical reduction of CO2: current status and prospective implementation

Abstract: The opportunities and challenges for exploiting the production of syngas from the electrochemical reduction of CO2are critically reviewed and analysed.

Cited by 311 publications

References 113 publications

Microwave‐Assisted Synthesis of Copper‐Based Electrocatalysts for Converting Carbon Dioxide to Tunable Syngas

Microwave‐Assisted Synthesis of Copper‐Based Electrocatalysts for Converting Carbon Dioxide to Tunable Syngas

A Gold–Palladium Nanoparticle Alloy Catalyst for CO Production from CO2 Electroreduction

Size Controllable Metal Nanoparticles Anchored on Nitrogen Doped Carbon for Electrocatalytic Energy Conversion

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Syngas production from electrochemical reduction of CO₂: current status and prospective implementation

A Gold–Palladium Nanoparticle Alloy Catalyst for CO Production from CO₂ Electroreduction