Geng, Wenhao; Wang, Qing; Zhu, Chang; Chen, Wei; Li, Guihua; Dong, Xiao; Song, Yanfang; Liu, Haiming; Wei, Wei; Sun, Yuhan

JOURNAL OF POWER SOURCES

2022, 529, 0378-7753

Geng, Wenhao; Wang, Qing; Zhu, Chang; Chen, Wei; Li, Guihua; Dong, Xiao; Song, Yanfang; Liu, Haiming; Wei, Wei; Sun, Yuhan

Electroreduction of CO2 into value-added products relies on the availability of highly active/selective and robust catalysts. Herein, we report a strategy to controllably enhance the catalytic activity of tin coordination polymers (Sn-CPs) for CO2 electroreduction via framework functionalization. By adjusting ligands, amino groups (-NH2) were successfully introduced into the framework of Sn-CPs, enabling the enhanced CO2 adsorption capacity and effectively suppressed H-2 evolution (H-2 Faraday efficiency (FE) < 10%) with lower overpotentials. With the highest surface Sn2+ content and most -NH2 functional groups in the framework among three Sn-CPs, Sn-DaPTA (tin 2,5-diaminoterephthalate) delivered the highest formate FE of 85% with a current density of 11 mA/cm(2) at-0.8 V (vs. RHE) and maintained stable performance during 18 reuse cycles. This work opens a new avenue for promoting the CO2 electroreduction performance of CPs via amino-functionalization.