Chinese Journal of Catalysis ›› 2023, Vol. 50: 249-259.DOI: 10.1016/S1872-2067(23)64476-6
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Zhaochun Liua, Xue Zongb, Dionisios G. Vlachosb, Ivo A. W. Filota,*(), Emiel J. M. Hensena,*()
Received:
2023-04-26
Accepted:
2023-06-25
Online:
2023-07-18
Published:
2023-07-25
Contact:
*E-mail: Zhaochun Liu, Xue Zong, Dionisios G. Vlachos, Ivo A. W. Filot, Emiel J. M. Hensen. A computational study of electrochemical CO2 reduction to formic acid on metal-doped SnO2[J]. Chinese Journal of Catalysis, 2023, 50: 249-259.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(23)64476-6
Fig. 1. Top view (a) and side view (b) of the SnO2?x(OH)4 model, top view (c) and side view (d) of the most stable adsorption configuration of CO2 on SnO2?x(OH)4 (gray = Sn, red = O atoms of SnO2?x(OH)4, orange = O of CO2, black = C, white = H).
Fig. 3. Top view of the most stable adsorption configuration of CO2RR on SnO2?x(OH)4 (gray = Sn, red = O atoms of SnO2?x(OH)4, orange = O of CO2, black = C, white = H).
Fig. 4. Reaction energy diagram for CO2RR on metal-doped SnO2?x(OH)4 surface at standard conditions (T = 298.15 K, P = 1 bar, pH = 0, and 0 V vs. RHE).
Fig. 5. Br?nsted-Evans-Polanyi plots for CO2 to COOH* step (a) and COOH* to HCOOH step (b) on metal-doped (metal = Ni, Pd, Bi, and Cu) SnO2?x(OH)4 surfaces.
Fig. 6. Correlation matrix between properties of the dopant metal and the reaction energy and activation barrier for the elementary reaction step CO2* + H* → COOH* + *. Positive values indicate positive correlations, while negatives ones anticorrelations between the parameters.
Fig. 7. Microkinetics simulations of electrochemical CO2RR on undoped and Bi-doped SnO2?x(OH)4 surfaces using a reaction-diffusion model pertaining to a rotating disc electrode setup operated at 100 r/min with a bulk pH of 6.8. (a) Total electrochemical current; (b) Near-surface concentration of CO2; (c) Near-surface concentration of H+; (d) Faradaic efficiency of various product.
Fig. 8. Evolution of surface coverages during electrochemical CO2RR on the SnO2?x(OH)4 surface on a rotating disc electrode at 100 r/min and a bulk pH of 6.8.
Fig. 9. The degree of rate control coefficients during electrochemical CO2RR on the SnO2?x(OH)4 surface on a rotating disc electrode at 100 r/min and a bulk pH of 6.8.
Fig. 10. Heatmap of the TOF as a function of ΔG*COOH ? ΔG*CO2 and ΔG*HCOOH ? ΔG*COOH adsorption energies for electrocatalytic CO2RR on metal doped SnO2?x(OH)4 surface based on DFT-based microkinetic simulations at ?0.2 V vs. RHE. Reaction conditions are T = 300 K on a rotating disc electrode at 100 r/min and a bulk pH of 6.8.
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