Controlled synthesis of CuSiO3 tip curvature improves C-C coupling efficiency in CO2 reduction to C2 products, indicating significant advancements in electrocatalysts.
Electroreduction of CO₂ to multicarbon products offers a promising strategy to carbon neutrality, yet practical application is hindered by sluggish C-C coupling kinetics and competing hydrogen evolution reaction (HER). To overcome these challenges, we propose a controllable synthesis method for tailoring the CuSiO₃ tip curvature, which manipulates the local electric field to regulate the C-C coupling barrier and suppress HER, thereby enhancing product selectivity. In particular, the high tip curvature catalyst (HC-CuSiO₃-1) exhibits a strong tip-enhanced electric field and stable hydrophobicity, achieving a Faradaic efficiency of 96.2% for C₂ products at -0.55 V. Via a variety of in situ techniques and theoretical calculation, the enhanced C₂ selectivity over HC-CuSiO₃-1 is attributed to the promotion of CO₂ adsorption and activation to form the *CHO intermediate, which facilitates subsequent asymmetric *COCHO coupling. This work provides insight into C-C coupling pathways and guides the rational design of local electric field enhanced electrocatalysts for CO₂ reduction.
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Wang et al. (2026) studied this question.
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