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<p>Carbon was deposited onto silicon nanowires (SiNWs) via pyrolysis to form a high-performance Carbon/SiNWs photocathode. Compared with pristine SiNWs, the carbon-modified photocathode exhibited substantially enhanced photoelectrochemical performance, achieving a photocurrent density of -13 mA<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\cdot\)</EquationSource> </InlineEquation>cm<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(^{-2}\)</EquationSource> </InlineEquation> at 0 V vs RHE and an onset potential of 0.60 V vs RHE, indicating a 0.42 V positive shift relative to unmodified SiNWs. Electrochemical impedance spectroscopy indicated a reduction in charge transfer resistance (<InlineEquation ID="IEq3"> <EquationSource Format="TEX">\({R_{ct}}\)</EquationSource> </InlineEquation>) from 1005 <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(\Omega\)</EquationSource> </InlineEquation> (pristine) to 91 <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(\Omega\)</EquationSource> </InlineEquation> (carbon-coated). These results demonstrate that carbon deposition is an effective strategy to enhance the photoelectrochemical performance of silicon-based photocathodes, offering direct relevance for solar energy conversion and water-splitting applications.</p>

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Fabrication of carbon-coated silicon nanowires for photoelectrochemical water splitting

  • 期刊论文

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  • 发表日期：

    2026年5月8日

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  • Shaohuan Liu,
  • Yun Hu,
  • Yunming Li,
  • Shuigen Li,
  • Hong Jin,
  • Juan Zhang,
  • Ping Huang,
  • Fauyun Zhang

摘要

Carbon was deposited onto silicon nanowires (SiNWs) via pyrolysis to form a high-performance Carbon/SiNWs photocathode. Compared with pristine SiNWs, the carbon-modified photocathode exhibited substantially enhanced photoelectrochemical performance, achieving a photocurrent density of -13 mA \(\cdot\) cm \(^{-2}\) at 0 V vs RHE and an onset potential of 0.60 V vs RHE, indicating a 0.42 V positive shift relative to unmodified SiNWs. Electrochemical impedance spectroscopy indicated a reduction in charge transfer resistance ( \({R_{ct}}\) ) from 1005 \(\Omega\) (pristine) to 91 \(\Omega\) (carbon-coated). These results demonstrate that carbon deposition is an effective strategy to enhance the photoelectrochemical performance of silicon-based photocathodes, offering direct relevance for solar energy conversion and water-splitting applications.