Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (7): 1634-1641.DOI: 10.1016/S1872-2067(21)63967-0
• Special column on catalytic conversion of CO 2 • Previous Articles Next Articles
Han Zheng,†, Zhengwu Yang,†, Xiangdong Kong, Zhigang Geng(), Jie Zeng()
Received:
2021-09-29
Accepted:
2021-11-03
Online:
2022-07-18
Published:
2022-05-20
Contact:
Zhigang Geng, Jie Zeng
About author:
First author contact:†Contributed equally to this work.
Supported by:
Han Zheng, Zhengwu Yang, Xiangdong Kong, Zhigang Geng, Jie Zeng. Progresses on carbon dioxide electroreduction into methane[J]. Chinese Journal of Catalysis, 2022, 43(7): 1634-1641.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(21)63967-0
Fig. 1. (a) Scheme of the reaction pathway for CO2 electroreduction to CH4; UL for elementary proton-transfer steps as a function of the binding energy for CO (EB[CO]) (b) and OH (EB[OH]) (c) over various electrocatalysts. Reprinted with permission from Ref. [22]. Copyright 2012, American Chemical Society.
Fig. 2. (a) HAADF-STEM image for SA-Zn/MNC. The bright dots were Zn atoms, some of which were highlighted by yellow circles. (b) EXAFS spectra for SA-Zn/MNC and standard samples. (c) FE for CH4 over SA-Zn/MNC at various applied potentials towards CO2 electroreduction. (d) The j and yield rate of CH4 over SA-Zn/MNC plotted against the concentration of CO2-saturated KHCO3 at -1.8 V vs. SCE. (e) Free energy diagrams for CO2 electroreduction into CH4 on Zn-N4-graphene at 0 and 0.87 V. Reprinted with permission from Ref. [33]. Copyright 2020 American Chemical Society.
Fig. 3. (a) TEM image of Cu/CeO2?x HDs. The insert showed the corresponding EDX elemental mapping of an individual Cu/CeO2?x HD. (b) FE and j for the products involved in CO2 electroreaction over CeO2?x nanocrystals (CeO2?x NCs), Cu NCs, Cu-CeO2?x mix, Cu/CeO2?x HDs at -1.2 V vs. RHE. (c) Charge exchange map between Cu(111) slab and CeO2?x cluster. The red and green isosurfaces were the enrichment and depletion regions, respectively. Ce, Cu, O, and H atoms in (c) were represented with blue spheres with sizes following the order of Ce > Cu > O > H. (d) Partial density of states (PDOS) of the d-orbital of an interfacial Cu atom with and without CeO2?x cluster. Breaking scaling relations of CO*/CHO* (e) and H2CO*/OH* (f) through bidentate adsorption. Reprinted with permission from Ref. [40]. Copyright 2019, American Chemical Society.
Fig. 4. (a) Scheme for the structural evolution of La2CuO4 perovskite during CO2 electroreduction. Color code: Cu, brick red; La, blue; O, red; C, gray; H, white. (b) HRTEM image and corresponding selected area electron diffraction (SAED) pattern (inset) of the Cu/La2CuO4. (c) XRD pattern of Cu/La2CuO4. (d) FE for the products involved in CO2 electroreduction over Cu/La2CuO4 at various applied potentials. (e) Chronoamperometric tests over Cu/La2CuO4 at various applied potentials. Reprinted with permission from Ref. [48]. Copyright 2020, American Chemical Society.
Fig. 5. (a) A proposed tandem mechanism of CO2 electroreduction into CH4 over CoPc@Zn-N-C. FE (b) and j (c) for CH4 towards CO2 electroreduction over various catalysts. (d) The free energy profile and optimized configurations of intermediates towards CO2 electroreduction into CH4. Part (1) was CO2 electroreduction into CO while part (2) represented CO electroreduction into CH4 over both CoPc and ZnN4. Reprinted with permission from Ref. [52]. Copyright 2020, John Wiley and Sons.
Catalyst | Electrolyte/cell | Potential (V vs. RHE) | FE(CH4) (%) | j(CH4) (mA cm-2) | Stability (h) | Ref. |
---|---|---|---|---|---|---|
Cu2O@CuHHTP | 0.1 mol/L KCl+0.1 mol/L KHCO3/H Cell | -1.4 | 73 | -10.8 | 5 | [ |
Cu-N-C-900 | 0.1 mol/L KHCO3/H Cell | -1.6 | 38.6 | -14.8 | 10 | [ |
SA-Zn/MNC | 1 mol/L KHCO3/H Cell | ~-1.2 | 85 | -31.8 | 35 | [ |
Cu-CeO2-4% | 0.1 mol/L KHCO3/H cell | -1.8 | 58 | -56 | 2.5 | [ |
Cu Clusters/DRC | 0.5 mol/L KHCO3/H Cell | -1.0 | 81.7 | -18 | 40 | [ |
CoO/Cu/PTFE | 1 mol/L KHCO3/Flow Cell | -1.1 | 60 | -135 | 18 | [ |
Cu/CeO2-x HDs | 0.1 mol/L KHCO3/H cell | -1.2 | 54 | ~-1.62 | 12.5 | [ |
Au-Pb | 0.5 mol/L KHCO3/H Cell | -1.07 | 2.8 | ~-0.30 | 3 | [ |
CuPc | 0.5 mol/L KHCO3/H cell | -1.06 | 66 | -13 | — | [ |
Cu/La2CuO4 | 1 mol/L KOH/Flow Cell | -1.4 | 56.3 | -117 | 0.28 | [ |
Cu68Ag32 | 0.5 mol/L KHCO3/H cell | -1.17 | 60 | ~-50 | 50 | [ |
Tandem Ag-Cu | 0.1 mol/L NaHCO3/H Cell | -1.1 | 60 | -5.04 | 2 | [ |
CoPc@Zn-N-C | 1 mol/L KOH/Flow Cell | -1.24 | 18.3 | -44.3 | — | [ |
Pyramid Cu-Ag | 0.2 mol/L KHCO3/H cell | -1.1 | 62 | -12.7 | 12 | [ |
Cu NWs | 0.1 mol/L KHCO3/H cell | -1.25 | 55 | ~-7.8 | 3 | [ |
Table 1 Comparision of catalytic performance for recently reported electrocatalysts towards CO2 electroreduction into CH4.
Catalyst | Electrolyte/cell | Potential (V vs. RHE) | FE(CH4) (%) | j(CH4) (mA cm-2) | Stability (h) | Ref. |
---|---|---|---|---|---|---|
Cu2O@CuHHTP | 0.1 mol/L KCl+0.1 mol/L KHCO3/H Cell | -1.4 | 73 | -10.8 | 5 | [ |
Cu-N-C-900 | 0.1 mol/L KHCO3/H Cell | -1.6 | 38.6 | -14.8 | 10 | [ |
SA-Zn/MNC | 1 mol/L KHCO3/H Cell | ~-1.2 | 85 | -31.8 | 35 | [ |
Cu-CeO2-4% | 0.1 mol/L KHCO3/H cell | -1.8 | 58 | -56 | 2.5 | [ |
Cu Clusters/DRC | 0.5 mol/L KHCO3/H Cell | -1.0 | 81.7 | -18 | 40 | [ |
CoO/Cu/PTFE | 1 mol/L KHCO3/Flow Cell | -1.1 | 60 | -135 | 18 | [ |
Cu/CeO2-x HDs | 0.1 mol/L KHCO3/H cell | -1.2 | 54 | ~-1.62 | 12.5 | [ |
Au-Pb | 0.5 mol/L KHCO3/H Cell | -1.07 | 2.8 | ~-0.30 | 3 | [ |
CuPc | 0.5 mol/L KHCO3/H cell | -1.06 | 66 | -13 | — | [ |
Cu/La2CuO4 | 1 mol/L KOH/Flow Cell | -1.4 | 56.3 | -117 | 0.28 | [ |
Cu68Ag32 | 0.5 mol/L KHCO3/H cell | -1.17 | 60 | ~-50 | 50 | [ |
Tandem Ag-Cu | 0.1 mol/L NaHCO3/H Cell | -1.1 | 60 | -5.04 | 2 | [ |
CoPc@Zn-N-C | 1 mol/L KOH/Flow Cell | -1.24 | 18.3 | -44.3 | — | [ |
Pyramid Cu-Ag | 0.2 mol/L KHCO3/H cell | -1.1 | 62 | -12.7 | 12 | [ |
Cu NWs | 0.1 mol/L KHCO3/H cell | -1.25 | 55 | ~-7.8 | 3 | [ |
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