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<p>Converting CO<sub>2</sub> into valuable chemicals is a sustainable way to address the energy and environmental crisis, yet achieving high selectivity toward CO remains challenging. Here, a S-doped copper-bismuth oxide (S-CuBiO<sub>x</sub>) catalyst with a hierarchical structure was synthesized via a facile solution method toward selectively producing CO from CO<sub>2</sub>. The prepared S-CuBiO<sub>x</sub> exhibits a 91.3% CO Faradic efficiency at −0.9 V<sub>RHE</sub> in an H-type cell with 0.5&#xa0;M KHCO<sub>3</sub> solution, delivering a 3.8-fold enhancement compared to the undoped CuBiO<sub>x</sub>, while decreasing the H<sub>2</sub> and HCOOH by-products to 2.6% and 4.5%, respectively. The doped-S can be responsible for the excellent CO selectivity, namely, the S dopant induces S-M-O (M = Cu or Bi) bond formation and tunes the local electronic structure of S-CuBiO<sub>x</sub>, thus benefiting *COOH formation/stabilization and accelerating the reaction kinetics toward CO. This work provides a rational design strategy for steering CO<sub>2</sub>RR selectivity toward CO via non-metal heteroatom doping in bimetallic oxide systems.</p> Graphical Abstract <p></p>

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Doping S Tailors the Electronic Structure of CuBiOx Catalyst for Selective CO2 Electroreduction to CO

  • 期刊论文

  • 发表日期：

    2026年5月9日

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  • Kun Tao,
  • Chao Zhao,
  • Wenya Yu,
  • Shengye Hu,
  • Hui Xue,
  • Mengmeng M. Zhang

摘要

Converting CO2 into valuable chemicals is a sustainable way to address the energy and environmental crisis, yet achieving high selectivity toward CO remains challenging. Here, a S-doped copper-bismuth oxide (S-CuBiOx) catalyst with a hierarchical structure was synthesized via a facile solution method toward selectively producing CO from CO2. The prepared S-CuBiOx exhibits a 91.3% CO Faradic efficiency at −0.9 VRHE in an H-type cell with 0.5 M KHCO3 solution, delivering a 3.8-fold enhancement compared to the undoped CuBiOx, while decreasing the H2 and HCOOH by-products to 2.6% and 4.5%, respectively. The doped-S can be responsible for the excellent CO selectivity, namely, the S dopant induces S-M-O (M = Cu or Bi) bond formation and tunes the local electronic structure of S-CuBiOx, thus benefiting *COOH formation/stabilization and accelerating the reaction kinetics toward CO. This work provides a rational design strategy for steering CO2RR selectivity toward CO via non-metal heteroatom doping in bimetallic oxide systems.

Graphical Abstract