Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (11): 2772-2791.DOI: 10.1016/S1872-2067(22)64095-6
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Hong Lia, Kun Jiangb, Shou-Zhong Zouc,#(), Wen-Bin Caia,*(
)
Received:
2022-04-30
Accepted:
2022-07-27
Online:
2022-11-18
Published:
2022-10-20
Contact:
Shou-Zhong Zou, Wen-Bin Cai
About author:
Shouzhong Zou (Department of Chemistry, American University) earned his B.S. in Chemistry in 1991 and completed his MS studies in 1994 from Xiamen University under the guidance of Prof. Zhong-Qun Tian. He received his Ph.D. in Chemistry from Purdue University in 1999 under the direction of Prof. Michael J. Weaver. He then did postdoctoral work at Caltech with Profs. Fred C Anson and Ahmed H. Zewail. He started his independent research as an assistant professor in 2002 at Miami University (Oxford, Ohio), and was promoted to associate professor in 2008. He joined American University in the summer of 2015 as a full professor and chair. His research interests include developing catalysts for low temperature fuel cells, CO2 reduction and gas sensing, and advancing spectroscopic and microscopic techniques for the characterization of surfaces and interfaces.Supported by:
Hong Li, Kun Jiang, Shou-Zhong Zou, Wen-Bin Cai. Fundamental aspects in CO2 electroreduction reaction and solutions from in situ vibrational spectroscopies[J]. Chinese Journal of Catalysis, 2022, 43(11): 2772-2791.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(22)64095-6
Fig. 2. The schematic setup of electrochemical attenuated total reflection (ATR) infrared spectroscopy (a) and Raman spectrocopy (b). Reprinted with permission from Ref. [32]. Copyright 2020, Proceedings of the National Academy of Sciences. (c) Sum-frequency generation spectroscopy. Reprinted with permission from Ref. [33]. Copyright 2019, American Chemical Society. Note: WE refers to working electrode, RE to reference electrode and CE to counter electrode.
Fig. 3. Simplified flowchart of CO2RR mechanisms leading to C1 and C2+ product generation. * Corresponds to adsorbed species, > 2e- reduction products of CH4 and C2+ that go through the reduction of *CO intermediate (*COR) are marked in light blue. Reprinted with permission from Ref. [52]. Copyright 2020, American Chemical Society.
Fig. 4. (a) In situ time-dependent ATR-IR spectra of CO2RR on Sn electrodes at -1.4 V vs. Ag/AgCl in 0.1 mol/L K2SO4 solution saturated with CO2. The black arrow shows the direction of evolution with time and the red frame shows the carbonate species. Reprinted with permission from Ref. [53]. Copyright 2015, American Chemical Society. (b) ATR-IR spectra of thin films of indium, tin, lead, and bismuth on exposure to CO2 under reducing conditions. Reprinted with permission from Ref. [54]. Copyright 2016, American Chemical Society. In situ ATR-SEIRAS collected under different applied potentials in CO2 saturated (c) and Ar-saturated (d) 0.5 mol/L KHCO3. Reprinted with permission from Ref. [55]. Copyright 2020, John Wiley and Sons.
Fig. 5. (a) In situ SERS spectra of CO2RR at nanoporous Ag surfaces in 0.1 mol/L KHCO3 solution saturated with CO2. The arrow on the right shows the potential scanning direction. Peaks marked with black and red dashed lines are attributed to the reported and new SERS signals, respectively. Reprinted with permission from Ref. [64]. Copyright 2020, American Chemical Society. (b) Vibrational sum-frequency generation study of CO2RR at Pt/EMIM-BF4 interfaces. Reprinted with permission from Ref. [65]. Copyright 2016, Elsevier.
Fig. 6. (a) Simulated structures of possible adsorbates on Cu(100) for CO2RR and their calculated infrared-active vibrational frequencies. Cu, Li, C, O, and H atoms are depicted as orange, yellow, gray, red and white spheres. Reprinted with permission from Ref. [60]. Copyright 2017, John Wiley and Sons. (b) The vibrational density of states (v-DoSs) of *OC-CO, *OC-COH, *HOC-COH, *C-COH, *CH-COH, *C-CH, *C-CH2, and *C=C=O intermediate. In A2-G2, v-DoS from quantum mechanics molecular dynamics (QM-MD) is shown as a solid black line, the experimental frequencies are shown as a red dashed line, and the vibrational frequencies from v-QM optimization are shown as solid blue lines for comparison. Reprinted with permission from Ref. [51]. Copyright 2019, Proceedings of the National Academy of Sciences. (c) In situ Raman spectra in CO2-saturated 0.2 mol/L NaHCO3 for iodide-derived copper (ID-Cu) and oxide-derived copper (OD-Cu) samples shown the enlarged region between 850-1150 cm-1 at -1.0 V vs. Ag/AgCl. (d) The -CHx stretching region between 2700-3000 cm-1 at -0.8 V vs. Ag/AgCl. Reprinted with permission from Ref. [72]. Copyright 2020, John Wiley and Sons.
Fig. 8. The schematic diagrams showing the roles of COtop and CObrigde on different electrodes. (a) Au electrode. Reprinted with permission from Ref. [84]. Copyright 2016, Proceedings of the National Academy of Sciences. (b) Pd electrode. Reprinted with permission from Ref. [85]. Copyright 2021, American Chemical Society. (c) Polycrystalline Cu electrode. Reprinted with permission from Ref. [82]. Copyright 2018, American Chemical Society. (d) Cu electrode with Cu(0) and Cu(I). Reprinted with permission from Ref. [86]. Copyright 2020, American Chemical Society.
Fig. 9. Schematic diagrams for the observed processes on anodic treatment of mechanically polished polycrystalline Cu electrode during CO2RR using in situ time-resolved surface-enhanced Raman spectroscopy. Reprinted with permission from Ref. [98]. Copyright 2021, John Wiley and Sons.
Fig. 10. Controversial views on OD-Cu catalysts during CO2RR. (a) Partially positive-charged copper (Cuδ+) is to boost the formation of highly valued multicarbon C2+ products during CO2RR. Reprinted with permission from Ref. [111]. Copyright 2020, American Chemical Society. (b) The electrochemical prereduction process, during which Cu2O nanocubes were converted into metallic Cu phase under a negative potential of -0.34 V vs. RHE. Reprinted with permission from Ref. [32]. Copyright 2020, Proceedings of the National Academy of Sciences of the United States of American. (c) Cu(100)/Cu(111) interfaces as superior active sites for CO dimerization during CO2RR. Reprinted with permission from Ref. [109]. Copyright 2021, American Chemical Society. (d) Role of a hydroxide layer on Cu electrodes in electrochemical CO2 Reduction. Reprinted with permission from Ref. [95]. Copyright 2019, American Chemical Society.
Fig. 11. (a) Schematic illustration of the effect of alkali metal cations on the local interfacial electric field on Cu electrodes. (b) Peak frequencies of the C≡O stretch band of linearly-bonded CO as a function of applied potential in CO-saturated 0.1 mol/L alkali metal bicarbonates as indicated. Reprinted with permission from Ref. [149]. Copyright 2017, The Royal Society of Chemistry. (c) Schematic illustration of the effect of alkali metal cations on local pH on Cu electrodes. (d) Steady-state pH at the metal-electrolyte interface during the electroreduction of CO2 at -1.0 V vs. RHE in CO2-saturated 0.05 mol/L M2CO3 solutions (M = Li+, Na+, K+, Cs+). Reprinted with permission from Ref. [154]. Copyright 2017, American Chemical Society.
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