Hexagonal prism-shaped CuO/SnO2 heterostructure for high-performance CO2ER to formate

Abstract

The hexagonal prism-shaped CuO/SnO2 heterostructured catalyst with electron-enriched SnO2 active sites was designed and synthesized. The formation of CuO/SnO2 heterointerface and electron-enriched SnO2 active sites significantly enhance the catalytic activity and selectivity toward HCOO- in CO2ER, while well-defined hexagonal prismatic architecture provides catalytic and morphological stability. Consequently, the catalyst delivers a jHCOO‒ surpassing that of pure SnO2 by 5 mA·cm-2 at -1.2 V vs. RHE and achieves up to FEHCOO‒ of 97% at -0.9 V vs. RHE, retains FEHCOO‒ above 80% with negligible current density decay after 36 hours of durability test.