Sn-Doped Bi₂O₃nanosheets for highly efficient electrochemical CO₂reduction toward formate production

Abstract

Sn-Doped Bi2O3 nanosheets showed enhanced catalytic selectivity and activity for CO2RR relative to undoped ones with 2.5% Sn-doped Bi2O3 NSs showing a highest FE of over 93% and a largest current density of nearly 50 mA cm−2 for formate in H-cell.

Enhanced electrocatalytic reduction of CO2to formateviadoping Ce in Bi2O3nanosheets

“…Sn, S, and B) can modify the electronic structures of the active sites and result in optimal adsorption energy of the reaction intermediates. [37][38][39][40] Cerium-based and ceria oxide-based catalysts are not ideal ECR electrocatalysts because of their poor intrinsic activity and the existence of the competitive HER. But some reports have proved that the activity of some ECR electrocatalysts can be effectively improved by combining with ceria through rational regulation.…”

Recent progress of Bi-based electrocatalysts for electrocatalytic CO2 reduction

“…As a result, these Bi-Sn oxides showed FE formate values above 76% in a large overpotential window ranging from −1.0 to −1.4 V vs. RHE. 24 The FE formate selectivity was further greatly enhanced to 93.4% at −0.97 V vs. RHE by using the same components and strategy, as recently reported by Li et al 40 In this case, Bi 2 O 3 nanosheets were also used to dope with various loadings of SnO 2 nanoparticles (1.2, 2.5, and 3.8%), with the optimal loading of 2.5%. The Bi 2 O 3 nanosheets can well maintain the Sn 4+ species as active sites during electrocatalysis, as confirmed by X-ray photoelectron spectroscopy (XPS).…”

Doping of Vanadium into Bismuth Oxide Nanoparticles for Electrocatalytic CO2 Reduction

“…What is more, the diffraction peaks exhibit a slight shift toward higher 2θ values as the doping amount increases, as shown in Figure S1, which might be resulted from the smaller atomic radius of V atoms than that of Bi atoms,. 25,34,35 The results above indicate that V atoms are successfully incorporated into the Bi 2 O 3 lattice.…”

“…20,49,50 Moreover, thanks to the abundant oxidation state of the V dopant, the valence state change from V 5+ to V 4+ will alter the electronic structure around the Bi, that is, decrease the electron density around the Bi active site, thus enhancing the adsorption and subsequent activation of CO 2 . 25,27,45 At the same time, the hydrogen protons adsorbed around the active site of Bi are further reduced due to the decrease in electron density around Bi, which leads to further inhibition of HER as well. 25,27 The synergistic crystal and electronic structure modulation in the V-doped Bi 2 O 3 endows the catalyst with excellent electrocatalytic performance for CO 2 reduction to formate.…”