Bismuth oxide nanoflakes grown on defective microporous carbon endows high-efficient CO2 reduction at ampere level

Minjun Zhou; Zhihao Guo; Mingwang Wang; Dewen Song; Rui Zhou; Hongbin Wang; Shuai Wang; Boshi Zheng; Xiaoshan Wang; Hui Ning; Mingbo Wu

doi:10.1016/j.jcis.2024.09.116

Bismuth oxide nanoflakes grown on defective microporous carbon endows high-efficient CO₂ reduction at ampere level

J Colloid Interface Sci. 2024 Sep 14;678(Pt C):309-316. doi: 10.1016/j.jcis.2024.09.116. Online ahead of print.

Authors

Minjun Zhou¹, Zhihao Guo², Mingwang Wang¹, Dewen Song³, Rui Zhou¹, Hongbin Wang¹, Shuai Wang¹, Boshi Zheng¹, Xiaoshan Wang⁴, Hui Ning⁵, Mingbo Wu¹

Affiliations

¹ State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, College of New Energy, Institute of New Energy, China University of Petroleum (East China), Qingdao 266580, China.
² Offshore Oil Engineering Co., Ltd, Tianjin 300452, China.
³ State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, College of New Energy, Institute of New Energy, China University of Petroleum (East China), Qingdao 266580, China; Sinopec Southwest Petroleum Bureau, Chengdu 610095, China.
⁴ College of Materials Science and Engineering, College of Physics, Weihai Innovation Research Institute, Qingdao University, Qingdao 266071, China.
⁵ State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, College of New Energy, Institute of New Energy, China University of Petroleum (East China), Qingdao 266580, China. Electronic address: ninghui@upc.edu.cn.

PMID: 39298983
DOI: 10.1016/j.jcis.2024.09.116

Abstract

Carbon dioxide electroreduction is a green technology for artificial carbon sequestration, which is being delayed from industrialization due to the lack of efficient catalysts at high current conditions. Herein, the Bi₂O₃ nanoflakes were uniformly grown on a defective porous carbon (PC). This self-assembling Bi₂O₃/PC catalyst was applied to drive CO₂ electroreduction at 1.0 A, 1.5 A and 2.0 A while the Faradaic efficiency of formate reaches 91.50 %, 86.30 % and 84.22 %, respectively. Density functional theory calculations revealed the intrinsic defect of carbon is able to give electron to Bi through O bridge, which increased the electron aggregation of Bi and lowered the generation energy barrier of *OCHO intermediate. Additionally, the unique 3D network of staggered Bi₂O₃ enhances the CO₂ adsorption and favors the electron transportation. By integrating all above advantages into a solid electrolyte-type cell, we are able to produce pure formic acid in a rate of 15.48 mmol h^-1 at ampere current.

Keywords: Bismuth oxide; Carbon dioxide; Electro reduction; Porous carbon.