Ordered Ag Nanoneedle Arrays with Enhanced Electrocatalytic CO<sub>2</sub> Reduction via Structure-Induced Inhibition of Hydrogen Evolution.
basic_science · Level V
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- Record sourced from PubMed, PMID 35913397.
- Also identified by DOI 10.1021/acs.nanolett.2c01853.
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Abstract
Silver is an attractive catalyst for converting CO<sub>2</sub> into CO. However, the high CO<sub>2</sub> activation barrier and the hydrogen evolution side reaction seriously limit its practical application and industrial perspective. Here, an ordered Ag nanoneedle array (Ag-NNAs) was prepared by template-assisted vacuum thermal-evaporation for CO<sub>2</sub> electroreduction into CO. The nanoneedle array structure induces a strong local electric field at the tips, which not only reduces the activation barrier for CO<sub>2</sub> electroreduction but also increases the energy barrier for the hydrogen evolution reaction (HER). Moreover, the array structure endows a high surface hydrophobicity, which can regulate the adsorption of water molecules at the interface and thus dynamically inhibit the competitive HER. As a result, the optimal Ag-NNAs exhibits 91.4% Faradaic efficiency (FE) of CO for over 700 min at -1.0 V <i>vs</i> RHE. This work provides a new concept for the application of nanoneedle array structures in electrocatalytic CO<sub>2</sub> reduction reactions.