Hexagonal prism-shaped CuO/SnO2 heterostructure for high-performance CO2ER to formate
Abstract
A hexagonal prism-shaped CuO/SnO2 heterostructured catalyst with electron-enriched SnO2 active sites was designed and synthesized. The formation of the CuO/SnO2 heterointerface and electron-enriched SnO2 active sites significantly enhanced the catalytic activity and selectivity for HCOO− in electrochemical reduction of carbon dioxide (CO2ER), while the well-defined hexagonal prismatic architecture provided catalytic and morphological stability. Consequently, the catalyst delivered a jHCOO− surpassing that of pure SnO2 by 5 mA cm−2 at −1.2 V vs. RHE and achieved FEHCOO− up to 97% at −0.9 V vs. RHE, retaining FEHCOO− above 80% with negligible current density decay after 36 hours of durability testing.