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<p>The advancement of a Z-scheme photoelectrochemical (PEC) system for hydrogen production and water splitting holds significant promise in addressing the escalating global energy crisis. In this study, a ternary Co-ZnCdS-BiFeO<sub>3</sub> Z-scheme composite photocatalyst was used. By optimizing the ratio of BiFeO<sub>3</sub>/ZnCdS, the photocatalytic activity of the material is enhanced, while enhancing the electron transfer efficiency and strengthening the stability of the photoelectric cathode. The Co(dmgBF<sub>2</sub>)2(H<sub>2</sub>O)<sub>2</sub> was selected as the co-catalyst to further improve the electron-hole separation efficiency and photocorrosion resistance. Under visible light irradiation, the hydrogen production rate of the PEC system can reach 4.03 mmol g<sup>−1</sup> h<sup>−1</sup>. Under optimal conditions, applying a bias voltage of −0.1 V vs. RHE can produce −38.5 µA cm<sup>−2</sup>. The photocatalytic current density of is as high as 13 times that of pure ZnCdS, greatly improving the hydrogen production efficiency and stability of the photocatalyst. The study offers a novel benchmark for the development of a high efficiency Z-scheme photocatalyst designed for water splitting and provides new insights into intrinsic resistance through PEC analyses.</p>

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ZnCdS-BiFeO3 heterojunction loaded with cobalt catalyst boosting photoelectrocatalytic hydrogen evolution

  • 期刊论文

  • 发表日期：

    2025年1月2日

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  • Ling Wang,
  • Qing Lou,
  • Haixia Qian,
  • Xiaoshuang Yin,
  • Ying Liu,
  • Wenzhong Yang,
  • Hui Xu

摘要

The advancement of a Z-scheme photoelectrochemical (PEC) system for hydrogen production and water splitting holds significant promise in addressing the escalating global energy crisis. In this study, a ternary Co-ZnCdS-BiFeO3 Z-scheme composite photocatalyst was used. By optimizing the ratio of BiFeO3/ZnCdS, the photocatalytic activity of the material is enhanced, while enhancing the electron transfer efficiency and strengthening the stability of the photoelectric cathode. The Co(dmgBF2)2(H2O)2 was selected as the co-catalyst to further improve the electron-hole separation efficiency and photocorrosion resistance. Under visible light irradiation, the hydrogen production rate of the PEC system can reach 4.03 mmol g−1 h−1. Under optimal conditions, applying a bias voltage of −0.1 V vs. RHE can produce −38.5 µA cm−2. The photocatalytic current density of is as high as 13 times that of pure ZnCdS, greatly improving the hydrogen production efficiency and stability of the photocatalyst. The study offers a novel benchmark for the development of a high efficiency Z-scheme photocatalyst designed for water splitting and provides new insights into intrinsic resistance through PEC analyses.