Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (12): 3161-3169.DOI: 10.1016/S1872-2067(22)64131-7
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Sunhong Ruana,†, Biao Zhanga,†, Jinhan Zoua,b, Wanfu Zhonga, Xiaoyang Hea, Jinhai Lua, Qinghong Zhanga,#(), Ye Wanga,b, Shunji Xiea,b,*(
)
Received:
2022-03-31
Accepted:
2022-05-05
Online:
2022-12-18
Published:
2022-10-18
Contact:
Qinghong Zhang, Shunji Xie
About author:
First author contact:†Contributed equally to this work.
Supported by:
Sunhong Ruan, Biao Zhang, Jinhan Zou, Wanfu Zhong, Xiaoyang He, Jinhai Lu, Qinghong Zhang, Ye Wang, Shunji Xie. Bismuth nanosheets with rich grain boundaries for efficient electroreduction of CO2 to formate under high pressures[J]. Chinese Journal of Catalysis, 2022, 43(12): 3161-3169.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(22)64131-7
Fig. 1. (a) Schematic setup of high-pressure H-cell for electrocatalytic CO2RR. (b) Current densities and FEs of CO2RR products over the BiPO4-derived catalyst in 1.0 mol L-1 KHCO3 under 1.0 MPa CO2. (c) Partial current density of formate under different CO2 pressures in 1.0 mol L-1 KHCO3. (d) Partial current density of products and formate formation rate of CO2RR in 2.0 mol L-1 KHCO3 under 3.0 MPa CO2. The experiments in each case were performed at least for three times and the error bar represents the relative deviation.
Fig. 2. CO2RR performances of BiPO4 derived under 3.0 MPa CO2 (BiPO4-derived-3) and 0.1 MPa CO2 (BiPO4-derived-0.1) then evaluated under 0.1 MPa CO2 in 1.0 mol L-1 KHCO3. (a) BiPO4-derived-3. (b) BiPO4-derived-0.1. (c) Double-layer capacitance (Cdl) of BiPO4-derived-3 and BiPO4-derived-0.1; (d) ECSA-corrected partial current density of formate for BiPO4-derived-3 and BiPO4-derived-0.1. The experiments in each case were performed at least for three times and the error bar represents the relative deviation.
Fig. 4. SEM (a), TEM and SAED (inset) (b), and HRTEM (c) images of BiPO4-derived-0.1. SEM (d), TEM and SAED (inset) (e), and HRTEM (f) of BiPO4-derived-3; (g) Schematic diagram of the structure evolution of BiPO4-derived catalysts under different CO2 pressures.
Fig. 5. (a) Optimized configurations of *CO2, HCOO*, *HCOOH on (001) facet of Bi and Bi-GB respectively. (b,c) Gibbs free energy diagrams for electrocatalytic CO2RR to formate and CO on Bi and Bi-GB. (d) Charge density differences plots of *CO2 and HCOO* on Bi and Bi-GB. Yellow and cyan regions represent electron accumulation and depletion, respectively. The yellow and cyan regions represent 0.0002 e per Å3 isosurfaces for *CO2 and 0.0020 e per Å3 isosurfaces for HCOO*. The light pink, brown, red and purple represent H, C, O and Bi atoms, respectively, and especially lilac represents Bi atom on the grain boundaries.
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