Details

Autor(en) / Beteiligte

• Xie, Yuxin
• Wang, Chen
• Chen, Yuli
• Zhao, Huawang
• Jing, Guohua
• Lv, Bihong

Titel

Efficient electroreduction of carbon dioxide to formate enabled by bismuth nanosheets enriched dual VBi0 vacancy

Ist Teil von

• Journal of environmental sciences (China), 2025-04, Vol.150, p.267-276

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2025

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• •VBi″′V0···Vbi″′ vacancy associates in BiOBr precursors converted into dual VBi0 vacancy sites during CO2ER.•Dual VBi0 vacancy associates enhance the CO2ER activity and selectivity of Bi° catalysts.•Bi VNS achieves a remarkable jHCOO−up to 755 mA/cm2 in a flow cell.•Dual VBi0 vacancy associates regulate the adsorption strength of the *OCHO intermediate. The electrocatalytic reduction of carbon dioxide (CO2ER) into formate presents a compelling solution for mitigating dependence on fossil energy and green utilization of CO2. Bismuth (Bi) has been gaining recognition as a promising catalyst material for the CO2ER to formate. The performance of Bi catalysts (named as Bi-V) can be significantly improved when they possess single metal atom vacancy. However, creating larger-sized metal atom vacancies within Bi catalysts remains a significant challenge. In this work, Bi nanosheets with dual VBi0 vacancy (Bi-DV) were synthesized utilizing in situ electrochemical transformation, using BiOBr nanosheets with triple vacancy associates (VBi″′VO···VBi″′, VBi″′ and V•• O denote the Bi3+ and O2− vacancy, respectively) as a template. The obtained Bi-DV achieved higher CO2ER activity than Bi-V, showing Faradaic efficiency for formate production of >92% from -0.9 to -1.2 VRHE in an H-type cell, and the partial current density of formate reached up to 755 mA/cm2 in a flow cell. The comprehensive characterizations coupled with density functional theory calculations demonstrate that the dual VBi0 vacancy on the surface of Bi-DV expedite the reaction kinetics toward CO2ER, by reducing the thermodynamic barrier of *OCHO intermediate formation. This research provides critical insights into the potential of large atom vacancies to enhance electrocatalysis performance. [Display omitted]