1. Revealing the structure–activity relationship of two Cu-porphyrin-based metal–organic frameworks for the electrochemical CO2-to-HCOOH transformation.
- Author
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Liu, Meng-Jie, Cao, Si-Min, Feng, Bao-Qi, Dong, Bao-Xia, Ding, Yan-Xia, Zheng, Qiu-Hui, Teng, Yun-Lei, Li, Zong-Wei, Liu, Wen-Long, and Feng, Li-Gang
- Subjects
STRUCTURE-activity relationships ,METAL-organic frameworks ,ELECTROCATALYSIS ,HETEROGENEOUS catalysis ,CATALYSTS ,STRUCTURAL models ,SURFACE area - Abstract
The eCO
2 RR activity is correlated to the internal structural character of the catalyst. We employed two types of structural models of porphyrin-based MOFs of PCN-222(Cu) and PCN-224(Cu) into heterogeneous catalysis to illustrate the effect of structural factors on the eCO2 RR performance. The composite catalyst PCN-222(Cu)/C displays better activity and selectivity (η = 450 mV, FEHCOOH = 44.3%, j = 3.2 mA cm−2 ) than PCN-224(Cu)/C (η = 450 mV, FEHCOOH = 34.1%, j = 2.4 mA cm−2 ) for the CO2 reduction to HCOOH in the range of −0.7–−0.9 V (vs. RHE) due to its higher BET surface area, CO2 uptake, and a larger pore diameter. It is interesting that PCN-224(Cu)/C displays better performance in the range of −0.4–−0.6 V (vs. RHE) due to its greater heat of adsorption, Qst and a higher affinity for CO2 molecule, which could promote the capture of CO2 onto the exposed active sites. As a result, PCN-224(Cu)/C exhibits better stability for the long-term electrolysis. [ABSTRACT FROM AUTHOR]- Published
- 2020
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