Electrocatalytic Alloys for CO₂ Reduction

ChemSusChem, Journal Year: 2017, Volume and Issue: 11(1), P. 48 - 57

Published: Dec. 5, 2017

Abstract Electrochemically reducing CO 2 using renewable energy is a contemporary global challenge that will only be met with electrocatalysts capable of efficiently converting into fuels and chemicals high selectivity. Although many different metals morphologies have been tested for electrocatalysis over the last several decades, relatively limited attention has committed to study alloys this application. Alloying promising method tailor geometric electric environments active sites. The parameter space discovering new particularly large because myriad products can formed during reduction. In Minireview, mixed‐metal electrocatalyst compositions evaluated reduction are summarized. A distillation structure–property relationships gleaned from survey intended help in construction guidelines classes reaction.

Language: Английский

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Facile synthesis of single-nickel-atomic dispersed N-doped carbon framework for efficient electrochemical CO2 reduction

Applied Catalysis B Environment and Energy, Journal Year: 2018, Volume and Issue: 241, P. 113 - 119

Published: Sept. 9, 2018

Language: Английский

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Sulfur-Modified Copper Catalysts for the Electrochemical Reduction of Carbon Dioxide to Formate

ACS Catalysis, Journal Year: 2017, Volume and Issue: 8(2), P. 837 - 844

Published: Dec. 11, 2017

The electrocatalytic CO2 reduction reaction (eCO2RR) has been gaining increasing attention owing to its potential contribute sustainability in our society, although enhanced catalytic performance is a prerequisite for implementation. Herein, Cu electrocatalysts modified with sulfur proved selectively produce formate via aqueous eCO2RR and thus unexpectedly prevent the mechanistic fingerprint of (i.e., CO path). Initially, sulfur-modified copper catalysts (Cu–S) were prepared by situ reductive reconstruction nano CuS precursors, revealing positive correlation between particle size selectivity toward formate. Subsequent studies over targeted submicron Cu–S particles varying content demonstrated their evolution under conditions, attaining similar surface state comprising metallic sulfide phases, irrespective initial structure materials. In accordance, showed only very limited influence on performance, which remained at approximately 80% Faradaic efficiency −0.8 V vs RHE, outperforming all cost-effective, earth-abundant, nontoxic reported date production eCO2RR.

Language: Английский

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Potential Link between Cu Surface and Selective CO₂ Electroreduction: Perspective on Future Electrocatalyst Designs

Advanced Materials, Journal Year: 2020, Volume and Issue: 32(17)

Published: March 5, 2020

Abstract Electrochemical reduction of carbon dioxide (CO 2 RR) product distribution has been identified to be dependent on various surface factors, including the Cu facet, morphology, chemical states, doping, etc., which can alter binding strength key intermediates such as *CO and *OCCO during reduction. Therefore, in‐depth knowledge catalyst identification active species under reaction conditions aid in designing efficient Cu‐based electrocatalysts. This progress report categorizes electrocatalysts into four main groups, namely metallic Cu, alloys, compounds (Cu + non‐metal), supported catalysts by carbon, metal oxides, or polymers). The detailed mechanisms for selective CO RR are presented, followed recent relevant developments synthetic procedures preparing nanoparticles. Herein, potential link between performance is highlighted, especially terms but other significant factors defective sites roughened morphology equally considered discussion current studies with fully understand origin enhancement toward C formation. concludes providing suggestions future designs highly stable RR.

Language: Английский

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CO₂reduction: the quest for electrocatalytic materials

Journal of Materials Chemistry A, Journal Year: 2017, Volume and Issue: 5(18), P. 8230 - 8246

Published: Jan. 1, 2017

Electrochemical conversion of CO₂has attracted attention worldwide since this process can convert carbon dioxide to a wide range value-added chemicals. This reaction required the development efficient electrocatalysts and fundamental understanding kinetics thermodynamics overcome current challenges.

Language: Английский

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An overview of Cu-based heterogeneous electrocatalysts for CO₂reduction

Journal of Materials Chemistry A, Journal Year: 2020, Volume and Issue: 8(9), P. 4700 - 4734

Published: Jan. 1, 2020

A tutorial guide and detailed summary of CO₂reduction with Cu-based heterogeneous electrocatalysts for newcomers to the field.

Language: Английский

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Selective and Stable Electroreduction of CO₂ to CO at the Copper/Indium Interface

ACS Catalysis, Journal Year: 2018, Volume and Issue: 8(7), P. 6571 - 6581

Published: May 11, 2018

Electrochemical reduction of CO2 using renewable energy is a promising strategy to mitigate the emissions and produce valuable chemicals. However, lack highly selective, durable, nonprecious-metal catalysts impedes applications this reaction. In work, copper-nanowire-supported indium are proposed as advanced electrocatalysts for aqueous electroreduction CO2. The synthesized by facile method, which combines In3+ deposition on Cu(OH)2 nanowires, mild oxidation, in situ procedures. With thin layer metallic deposited surface Cu catalyst exhibits CO Faradaic efficiency ∼93% at −0.6 −0.8 V vs RHE; additionally, an unprecedented stability 60 h achieved. characterization results combined with density functional theory (DFT) calculations reveal that interface plays essential role determining reaction pathway. calculation suggest Cu–In enhances adsorption strength *COOH, key intermediate production, while destabilizes *H, H2 evolution. We believe these findings will provide guidance rational design high-performance bimetallic creating metal–metal structure.

Language: Английский

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The Tunable and Highly Selective Reduction Products on Ag@Cu Bimetallic Catalysts Toward CO₂ Electrochemical Reduction Reaction

The Journal of Physical Chemistry C, Journal Year: 2017, Volume and Issue: 121(21), P. 11368 - 11379

Published: May 1, 2017

Bimetallic electrocatalysts can improve the activity and selectivity over their monometallic counterparts by tuning structure, morphology, composition. However, there scarcely was a systematic model to understand structural effect relationship on CO2 electrochemical reduction reaction, especially for product process introduction of second metal grow into outer layers. Herein, we report structure-controlled growth Ag@Cu bimetallic nanoparticles that are fabricated polyol method, is, reducing mixtures Ag+ Cu2+ (excess amount) in ethylene glycol (reducing agent) presence polyvinylpyrrolidone. Structural characterizations reveal series NPs tuned from Ag core, Cu modified Ag, shell controlling heating time (0–25 min). Moreover, highly selective catalysts with products carbon monoxide hydrocarbons be realized. Different "dilution" effects between Cu, volcanic curve production is detected peak point Ag@Cu-7 electrocatalyst (heating 7 Similarly, interestingly, when cladding layer continuously grows, not simple proportional addition optimized at Ag@Cu-20 20 The geometric dominantly account synergistic CO control surface hydrocarbons. This study serves as good starting tune energetics intermediate binding achieve even higher core–shell structured catalysts.

Language: Английский

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Defining a Materials Database for the Design of Copper Binary Alloy Catalysts for Electrochemical CO₂ Conversion

Advanced Materials, Journal Year: 2018, Volume and Issue: 30(42)

Published: Jan. 24, 2018

Abstract While Cu electrodes are a versatile material in the electrochemical production of desired hydrocarbon fuels, binary alloy recently proposed to further tune reaction directionality and, more importantly, overcome intrinsic limitation scaling relations. Despite encouraging empirical demonstrations various Cu‐based metal systems, underlying principles their outstanding performance not fully addressed. In particular, possible phase segregation with concurrent composition changes, which is widely observed field metallurgy, at all considered. Moreover, surface‐exposed metals can easily form oxide species, another pivotal factor that determines overall catalytic properties. Here, understanding catalysts for CO 2 reduction and recent progress this discussed. From viewpoint thermodynamic stability system elemental mixing, microstructures naturally generated surface species proposed. These basic science help predict understand structure moreover, act as an inspiration development new improve conversion ultimately, achieve carbon‐neutral cycle.

Language: Английский

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Electrochemical Reduction of Carbon Dioxide to Syngas and Formate at Dendritic Copper–Indium Electrocatalysts

ACS Catalysis, Journal Year: 2017, Volume and Issue: 7(8), P. 5381 - 5390

Published: July 7, 2017

The ability to maintain high efficiencies while simultaneously tuning the selectivity of electrochemical reduction CO2 (ERC) using low-cost electrodes has proven be one greatest obstacles widespread commercialization this technology. In study, we electrodeposit dendritic copper–indium alloys various compositions and investigate their catalytic activity toward CO2. These electrocatalysts are increasingly with higher fraction and, depending on composition, consist mixed phases Cu, In, Cu–In intermetallic phases. ERC at these produces formate (up 62% a 80 at% alloy, −1 V) also CO/H2 ratio achieve an ideal syngas composition 40 alloy (−1 V). observed product distribution as function applied potential is rationalized in terms relative adsorption strengths CO COOH intermediates Cu sites distinct variation induced by differences electronic structure. This study highlights opportunities enhance control over suggests that suitable could promising catalysts for inexpensive efficient production fuels.

Language: Английский

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