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Direct electrosynthesis of 52% concentrated CO on silver's twin boundary.

ABSTRACT: The gaseous product concentration in direct electrochemical CO₂ reduction is usually hurdled by the electrode's Faradaic efficiency, current density, and inevitable mixing with the unreacted CO₂. A concentrated gaseous product with high purity will greatly lower the barrier for large-scale CO₂ fixation and follow-up industrial usage. Here, we developed a pneumatic trough setup to collect the CO₂ reduction product from a precisely engineered nanotwinned electrocatalyst, without using ion-exchange membrane. The silver catalyst's twin boundary density can be tuned from 0.3 to 1.5 × 10⁴ cm^-1. With the lengthy and winding twin boundaries, this catalyst exhibits a Faradaic efficiency up to 92% at -1.0 V and a turnover frequency of 127 s^-1 in converting CO₂ to CO. Through a tandem electrochemical-CVD system, we successfully produced CO with a volume percentage of up to 52%, and further transformed it into single layer graphene film.

SUBMITTER: Tang C

PROVIDER: S-EPMC8035331 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Twin boundary migration in an individual platinum nanocrystal during catalytic CO oxidation.

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A Direct Grain-Boundary-Activity Correlation for CO Electroreduction on Cu Nanoparticles.

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Enhanced microbial electrosynthesis by using defined co-cultures.

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Project description:[Figure: see text].

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In-plane anisotropy and twin boundary effects in vanadium nitride under nanoindentation.

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Atomistic mechanisms of nonstoichiometry-induced twin boundary structural transformation in titanium dioxide.

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| S-EPMC4432645 | biostudies-literature

Strain localisation and failure at twin-boundary complexions in nickel-based superalloys.

Project description:Twin boundaries (TBs) in Ni-based superalloys are vulnerable sites for failure in demanding environments, and a current lack of mechanistic understanding hampers the reliable lifetime prediction and performance optimisation of these alloys. Here we report the discovery of an unexpected γ″ precipitation mechanism at TBs that takes the responsibility for alloy failure in demanding environments. Using multiscale microstructural and mechanical characterisations (from millimetre down to atomic level) and DFT calculations, we demonstrate that abnormal γ″ precipitation along TBs accounts for the premature dislocation activities and pronounced strain localisation associated with TBs during mechanical loading, which serves as a precursor for crack initiation. We clarify the physical origin of the TBs-related cracking at the atomic level of γ″-strengthened Ni-based superalloys in a hydrogen containing environment, and provide practical methods to mitigate the adverse effect of TBs on the performance of these alloys.

| S-EPMC7524752 | biostudies-literature

Free-electron creation at the 60° twin boundary in Bi2Te3.

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Twin boundary defect engineering improves lithium-ion diffusion for fast-charging spinel cathode materials.

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