Hierarchical Mesoporous SnO 2 Nanosheets on Carbon Cloth: A Robust and Flexible Electrocatalyst for CO 2 Reduction with High Efficiency and Selectivity

Abstract Electrochemical reduction of CO 2 into liquid fuels is a promising approach to achieve a carbon‐neutral energy cycle. However, conventional electrocatalysts usually suffer from low energy efficiency and poor selectivity and stability. A 3D hierarchical structure composed of mesoporous SnO 2 nanosheets on carbon cloth is proposed to efficiently and selectively electroreduce CO 2 to formate in aqueous media. The electrode is fabricated by a facile combination of hydrothermal reaction and calcination. It exhibits an unprecedented partial current density of about 45 mA cm −2 at a moderate overpotential (0.88 V) with high faradaic efficiency (87±2 %), which is even larger than most gas diffusion…