Dynamically Reconstructed Cu Nanowire Arrays Realizing Efficient Industrial-Current-Density CO<sub>2</sub>-to-C<sub>2+</sub> Electroreduction.
basic_science · Level V
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- Record sourced from PubMed, PMID 40364533.
- Also identified by DOI 10.1021/acs.nanolett.5c01599.
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Abstract
Selective C<sub>2+</sub> production at industrial current densities is highly desirable but still colossally challenging, even for typical Cu-based catalysts. To address these issues, self-supporting Cu nanowire arrays assembled on a gas diffusion layer are first fabricated by in situ electroreduction of Cu(OH)<sub>2</sub> nanowire arrays, while in situ X-ray diffraction patterns and in situ Raman measurements monitor their dynamic phase transformation process. The finite-element method calculations elucidate that the nanowire array structure enriches the local concentration of CO<sub>2</sub>/CO, further verified by operando Raman spectra. In situ attenuated total reflection-surface-enhanced infrared absorption spectroscopy reveals the Cu nanowire arrays promote *CO dimerization into *OCCO intermediates. Based on the above merits, the Cu nanowire arrays achieve a high Faradaic efficiency of 75.4% for C<sub>2+</sub> products with a current density of 500 mA cm<sup>-2</sup>. Overall, this study provides new insights into designing array catalysts for creating confined spaces to enrich reactants and intermediates.