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<p>Photocatalytic CO<sub>2</sub> reduction using solar energy offers a promising path to carbon neutrality, with ZnO as a favored semiconductor due to its abundance, favorable band alignment, and eco-friendliness. However, challenges such as high carrier recombination, limited light absorption, and poor CO<sub>2</sub> adsorption limit its performance. To overcome these issues, an Ohmic contact heterostructure strategy is proposed. A theoretical screening of five noble metals (Ag, Pd, Ir, Au and Pt) for forming Ohmic contact metal–semiconductor heterostructures with ZnO was conducted, followed by experimental validation. Among these, the Au/ZnO heterostructure, with an appropriate Fermi level difference (Δ(<i>Ф</i><sub>ZnO</sub>—<i>Ф</i><sub>metal</sub>)) of 2.02&#xa0;eV, achieved the highest CO yield of 28.66&#xa0;μmol&#xa0;g<sup>–1</sup>&#xa0;h<sup>−1</sup>, significantly outperforming than other Metal/ZnO combinations. Further investigation of Au/ZnO revealed that the Ohmic contact enhances photogenerated carrier separation, while Au nanoparticles serve as active sites and promote key reactions, including CO<sub>2</sub> adsorption, *COOH formation, and *CO desorption, leading to improved CO<sub>2</sub> reduction efficiency. This work provides valuable insights into the design of high-performance photocatalysts based on Ohmic contact heterostructures, offering potential solutions for energy and environmental challenges.</p>

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Ohmic contact Metal/ZnO heterostructure for CO2 photoreduction to CO

  • 期刊论文

  • 发表日期：

    2025年10月31日

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  • Chao-Gang Ban,
  • Xiao Su,
  • Yun-Zhu An,
  • Yu Xia,
  • Hong-Lin Zhou,
  • Jiu-Yan Li,
  • Jiang-Jie Ye,
  • Li-Jun Wu,
  • Jiang-Ping Ma,
  • Jun-Jie Ding,
  • Yang Wang,
  • Ya-Jie Feng,
  • Xiao-Ping Tao,
  • Li-Yong Gan,
  • Ji-Yan Dai,
  • Xiao-Yuan Zhou

摘要

Photocatalytic CO2 reduction using solar energy offers a promising path to carbon neutrality, with ZnO as a favored semiconductor due to its abundance, favorable band alignment, and eco-friendliness. However, challenges such as high carrier recombination, limited light absorption, and poor CO2 adsorption limit its performance. To overcome these issues, an Ohmic contact heterostructure strategy is proposed. A theoretical screening of five noble metals (Ag, Pd, Ir, Au and Pt) for forming Ohmic contact metal–semiconductor heterostructures with ZnO was conducted, followed by experimental validation. Among these, the Au/ZnO heterostructure, with an appropriate Fermi level difference (Δ(ФZnO—Фmetal)) of 2.02 eV, achieved the highest CO yield of 28.66 μmol g–1 h−1, significantly outperforming than other Metal/ZnO combinations. Further investigation of Au/ZnO revealed that the Ohmic contact enhances photogenerated carrier separation, while Au nanoparticles serve as active sites and promote key reactions, including CO2 adsorption, *COOH formation, and *CO desorption, leading to improved CO2 reduction efficiency. This work provides valuable insights into the design of high-performance photocatalysts based on Ohmic contact heterostructures, offering potential solutions for energy and environmental challenges.