Investigation and Mitigation of Carbon Deposition over Copper Catalyst during Electrochemical CO₂ Reduction

Precision Chemistry, Journal Year: 2024, Volume and Issue: 2(4), P. 151 - 160

Published: March 1, 2024

Copper (Cu) is considered to be the most effective catalyst for electrochemical conversion of carbon dioxide (CO2) into value-added hydrocarbons, but its stability still faces considerable challenge. Here, we report poisoning effect deposition during CO2 reduction on active sites Cu electrode─a critical deactivation factor that often overlooked. We find that, *C, an intermediate toward methane formation, could desorb electrode surface form species. reveal a strong correlation between formation and deposition, reaction conditions favoring production result in more deposition. The deposited blocks consequently causes rapid deterioration catalytic performance. further demonstrate can mitigated by increasing roughness pH electrolyte. This work offers new guidance designing stable catalysts reduction.

Language: Английский

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Activation of Ga Liquid Catalyst with Continuously Exposed Active Sites for Electrocatalytic C−N Coupling

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(18)

Published: Feb. 15, 2024

Abstract Environmentally friendly electrocatalytic coupling of CO 2 and N for urea synthesis is a promising strategy. However, it still facing problems such as low yield well stability. Here, new carbon‐coated liquid alloy catalyst, Ga 79 Cu 11 Mo 10 @C designed efficient electrochemical by activating active sites. During the co‐reduction process, reaches 28.25 mmol h −1 g , which highest reported so far under same conditions, Faraday efficiency (FE) also high 60.6 % at −0.4 V vs. RHE. In addition, catalyst shows excellent stability 100 testing. Comprehensive analyses showed that sequential exposure density sites promoted adsorption activation reactions. This reaction occurs through thermodynamic spontaneous between *N=N* to form C−N bond. The deformability state facilitates recovery enhances resistance poisoning. Moreover, introduction stimulates sites, successfully synthesises *NCON* intermediate. energy barrier third proton‐coupled electron transfer process rate‐determining step (RDS) *NHCONH→*NHCONH was lowered, ensuring urea.

Language: Английский

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Liquid-metal-based magnetic fluids

Nature Reviews Materials, Journal Year: 2024, Volume and Issue: 9(6), P. 433 - 449

Published: May 15, 2024

Language: Английский

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Liquid Metal Droplet and Graphene Co‐Fillers for Electrically Conductive Flexible Composites

Small, Journal Year: 2019, Volume and Issue: 16(12)

Published: Sept. 29, 2019

Colloidal liquid metal alloys of gallium, with melting points below room temperature, are potential candidates for creating electrically conductive and flexible composites. However, inclusion micro- nanodroplets into soft polymeric matrices requires a harsh auxiliary mechanical pressing to rupture the droplets establish continuous pathways high electrical conductivity. such destructive strategy reduces integrity Here, this problem is solved by incorporating small loading nonfunctionalized graphene flakes The introduce cavities that filled after only relatively mild press-rolling (<0.1 MPa) form within matrix, while maintaining flexibility composites characterized show even very low loadings (≈0.6 wt%) can achieve conductance remains nearly constant, changes less than 0.5%, under applied pressure >30 kPa. used forming electrically-conductive tracks in electronic circuits self-healing property. demonstrated application co-fillers, together droplets, be establishing printable-composite future large-area electronics.

Language: Английский

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The chemistry of Ce-based metal–organic frameworks

Dalton Transactions, Journal Year: 2020, Volume and Issue: 49(46), P. 16551 - 16586

Published: Jan. 1, 2020

Metal-organic frameworks (MOFs) have gained widespread attention due to their modular construction that allows the tuning of properties. Within this vast class compounds, metal carboxylates containing tri- and tetravalent ions been in focus many studies often high thermal chemical stabilities. Cerium has a rich chemistry, which depends strongly on its oxidation state. Ce(iii) exhibits properties typically observed for rare earth elements, while Ce(iv) is mostly known behaviour. In MOF chemistry reflected unique optical catalytic The synthetic parameters Ce(iii)- Ce(iv)-MOFs also differ substantially conditions must be chosen prevent reduction formation latter. Ce(iii)-MOFs are usually reported comprehensive together with those constructed other RE elements normally they isostructural. They exhibit greater structural diversity, larger variety inorganic building units. contrast, synthesis were only recently (2015) established. These lead selectively hexanuclear Ce-O clusters well-known Zr-MOFs therefore very similar isoreticluar found. Hence porosity, few porous described. Some these show flexibility makes them interesting separation processes. For redox most relevant. Thus, intensively discussed catalytic, photocatalytic sensing applications. perspective, synthesis, Ce-MOFs summarized.

Language: Английский

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