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<p>To commercialize the technology of photoelectrochemical hydrogen production, it is essential to surpass the US. Department of Energy target of 0.36 mmol h<sup>−1</sup> cm<sup>−2</sup> for 1-sun hydrogen production rate. In this study, we utilize crystalline silicon, which can exhibit the highest photocurrent density (43.37 mA cm<sup>−2</sup>), as the photoelectrode material. However, achieving bias-free water splitting (&gt;1.6 V) remains challenging due to the intrinsic low photovoltage of crystalline silicon (0.6 V). To address this limitation, we replace water oxidation with low-potential furfural oxidation, enabling not only bias-free hydrogen production but also dual hydrogen production at both the cathodic and anodic sides. This approach results in a record 1-sun hydrogen production rate of 1.40 mmol h<sup>−1</sup> cm<sup>−2</sup>, exceeding the Department of Energy target by more than fourfold.</p>

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Coupling furfural oxidation for bias-free hydrogen production using crystalline silicon photoelectrodes

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月19日

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  • Myohwa Ko,
  • Myounghyun Lee,
  • Taehyeon Kim,
  • Wonjoo Jin,
  • Wonsik Jang,
  • Seon Woo Hwang,
  • Haneul Kim,
  • Ja Hun Kwak,
  • Seungho Cho,
  • Kwanyong Seo,
  • Ji-Wook Jang

摘要

To commercialize the technology of photoelectrochemical hydrogen production, it is essential to surpass the US. Department of Energy target of 0.36 mmol h−1 cm−2 for 1-sun hydrogen production rate. In this study, we utilize crystalline silicon, which can exhibit the highest photocurrent density (43.37 mA cm−2), as the photoelectrode material. However, achieving bias-free water splitting (>1.6 V) remains challenging due to the intrinsic low photovoltage of crystalline silicon (0.6 V). To address this limitation, we replace water oxidation with low-potential furfural oxidation, enabling not only bias-free hydrogen production but also dual hydrogen production at both the cathodic and anodic sides. This approach results in a record 1-sun hydrogen production rate of 1.40 mmol h−1 cm−2, exceeding the Department of Energy target by more than fourfold.