Details

Autor(en) / Beteiligte

• Gao, Zengqiang
• Hou, Man
• Shi, Yongxia
• Li, Li
• Sun, Qisheng
• Yang, Shuyuan
• Jiang, Zhiqiang
• Yang, Wenjuan
• Zhang, Zhicheng
• Hu, Wenping

Titel

A conductive catecholate-based framework coordinated with unsaturated bismuth boosts CO electroreduction to formate

Ist Teil von

• Chemical science (Cambridge), 2023-06, Vol.14 (25), p.686-6866

Erscheinungsjahr

2023

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Bismuth-based metal-organic frameworks (Bi-MOFs) have received attention in electrochemical CO 2 -to-formate conversion. However, the low conductivity and saturated coordination of Bi-MOFs usually lead to poor performance, which severely limits their widespread application. Herein, a conductive catecholate-based framework with Bi-enriched sites (HHTP, 2,3,6,7,10,11-hexahydroxytriphenylene) is constructed and the zigzagging corrugated topology of Bi-HHTP is first unraveled via single-crystal X-ray diffraction. Bi-HHTP possesses excellent electrical conductivity (1.65 S m −1 ) and unsaturated coordination Bi sites are confirmed by electron paramagnetic resonance spectroscopy. Bi-HHTP exhibited an outstanding performance for selective formate production of 95% with a maximum turnover frequency of 576 h −1 in a flow cell, which surpassed most of the previously reported Bi-MOFs. Significantly, the structure of Bi-HHTP could be well maintained after catalysis. In situ attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) confirms that the key intermediate is *COOH species. Density functional theory (DFT) calculations reveal that the rate-determining step is *COOH species generation, which is consistent with the in situ ATR-FTIR results. DFT calculations confirmed that the unsaturated coordination Bi sites acted as active sites for electrochemical CO 2 -to-formate conversion. This work provides new insights into the rational design of conductive, stable, and active Bi-MOFs to improve their performance towards electrochemical CO 2 reduction. A conductive MOF, named Bi-based catecholate BiHHTP, exhibited excellent catalytic performance towards CO 2 electroreduction.