Chinese Journal of Catalysis ›› 2021, Vol. 42 ›› Issue (9): 1439-1444.DOI: 10.1016/S1872-2067(20)63762-7
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Kai Guoa, Haitao Leia, Xialiang Lia, Zongyao Zhangb, Yabo Wanga, Hongbo Guoa, Wei Zhanga, Rui Caoa,*()
Received:
2020-12-19
Accepted:
2021-01-11
Online:
2021-09-18
Published:
2021-05-16
Contact:
Rui Cao
About author:
* Tel: +86-29-81530726; Fax: +86-29-81530727; E-mail: ruicao@snnu.edu.cnSupported by:
Kai Guo, Haitao Lei, Xialiang Li, Zongyao Zhang, Yabo Wang, Hongbo Guo, Wei Zhang, Rui Cao. Alkali metal cation effects on electrocatalytic CO2 reduction with iron porphyrins[J]. Chinese Journal of Catalysis, 2021, 42(9): 1439-1444.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(20)63762-7
Fig. 1. (a) Molecular structures of FeP and N18C6-FeP; (b) Thermal ellipsoid plot (50% probability) of the X-ray structure of FeP. Hydrogen atoms are omitted for clarity.
Fig. 2. (a) CV of 0.5 mM FeP in DMF under argon at a scan rate of 100 mV s-1; (b) Plot of the FeII/I reduction peak current against the square root of the scan rate. The concentration of FeP was 0.5 mM; (c) LSVs of 1.0 mM FeP in DMF under argon and under CO2 with 10 mM H2O; (d) LSVs of different concentrations of FeP in DMF under CO2 with 10 mM H2O. Inset: the plot of catalytic current against the concentration of FeP, showing a linear relationship.
Complex | E1/2 (V vs. ferrocene) | ||
---|---|---|---|
FeIII/II | FeII/I | FeI/0 | |
FeP | -0.63 | -1.50 | -2.14 |
N18C6-FeP | -0.60 | -1.48 | -2.12 |
Table 1 Reduction potentials of N18C6-FeP and FeP in DMF.
Complex | E1/2 (V vs. ferrocene) | ||
---|---|---|---|
FeIII/II | FeII/I | FeI/0 | |
FeP | -0.63 | -1.50 | -2.14 |
N18C6-FeP | -0.60 | -1.48 | -2.12 |
Fig. 4. (a) CV of 0.5 mM N18C6-FeP in DMF under argon at a scan rate of 100 mV s-1; (b) Plot of the FeII/I reduction peak current against the square root of the scan rate. The concentration of N18C6-FeP was 0.5 mM; (c) LSVs of 1.0 mM N18C6-FeP in DMF under argon and under CO2 with 10 mM H2O. (d) LSVs of different concentrations of N18C6-FeP in DMF under CO2 with 10 mM H2O. Inset: plot of catalytic current against the concentration of N18C6-FeP, showing a linear relationship.
Fig. 5. LSVs of 0.5 mM N18C6-FeP in DMF under CO2 with the addition of Na+ (a) and K+ (b). Conditions: 0.1 M Bu4N(PF6), 100 mV s-1 scan rate, 10 mM H2O. (c) Catalytic CO2RR currents with FeP and N18C6-FeP in the absence and in the presence of 20 equivalents of Na+ and K+. (d) 1H NMR titration studies of N18C6 in CD3CN, showing the downfield shifts of the peak at 3.49 ppm with the addition of Na+ and K+.
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