Bismuth/Graphdiyne Heterostructure for Electrocatalytic Conversion of CO2 to Formate

Electrocatalytic CO 2 reduction is great promising in alleviating the excessive CO 2 emission and the conversion to valuable productions. Herein we report the in-situ controlled growth of Bismuth nanoflower/graphdiyne heterostructures(Bi/GDY) for efficient CO 2 conversion toward formate. Based on GDY, the obtained electrocatalyst exhibits a partial current density of 19.2 mA/cm 2 and high reaction selectivity towards formate with a high Faradic efficiency of 91.7% at −1.03 V vs. RHE, and an energy efficiency of 58.8%. The high formate yield rates could be maintained at around 300 µ.mol/(cm 2 ·h) over a wide potential range. Detailed characterizations show that the unique interface structures between GDY and Bi can enhance the charge transfer ability, increase the number of active sites, and improve the long-term stability, and finally reach high-performance electrocatalytic conversion of CO 2 to formate.