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<p>Utilizing wastewater as an electrolyte for green hydrogen gas generation presents a promising avenue due to its widespread availability and potential for transforming harmful water into a valuable resource for environmentally friendly hydrogen production. A highly promising photocathode is developed to achieve this goal, consisting of a composite material comprising graphitic carbon nitride and poly-1-amino-2-mercaptobenzene (G-C<sub>3</sub>N<sub>4</sub>/PA<sub>2</sub>MB). This composite forms a porous network of 150&#xa0;nm, exhibiting excellent photon absorption capabilities extending into the infrared (IR) region and a bandgap value of 1.5&#xa0;eV. In the H<sub>2</sub> gas production process, a three-electrode cell is configured using wastewater as both the electrolyte and self-sacrificing agent. The photocathode demonstrates a remarkable hydrogen production rate of 22&#xa0;µmole/h for every 10&#xa0;cm<sup>2</sup>, accompanied by an achieved current density (<i>J</i><sub>ph</sub>) of −&#xa0;0.012&#xa0;mA/cm<sup>2</sup>. Furthermore, the photocathode's performance is evaluated under various optical photon energies ranging from 3.6 to 1.7&#xa0;eV, revealing its sensitivity to different photon energies and resulting in varied <i>J</i><sub>ph</sub> values.</p><p>This promising G-C<sub>3</sub>N<sub>4</sub>/PA<sub>2</sub>MB photocathode, fabricated through a one-pot process, serves as an exceptional electrode capable of utilizing wastewater to produce green hydrogen gas. Its efficacy in harnessing photon energy from various sources and its ability to operate effectively in wastewater environments make it a valuable asset for sustainable hydrogen generation initiatives.</p>

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Graphitic carbon nitride-poly(1-amino-2-mercaptobenzene) composite as a promising photocathode for green hydrogen generation from sanitation water without external sacrificial agents

  • 期刊论文

  • 发表日期：

    2025年9月13日

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  • Wassim El Malti,
  • Maha Abdallah Alnuwaiser,
  • Mohamed Rabia

摘要

Utilizing wastewater as an electrolyte for green hydrogen gas generation presents a promising avenue due to its widespread availability and potential for transforming harmful water into a valuable resource for environmentally friendly hydrogen production. A highly promising photocathode is developed to achieve this goal, consisting of a composite material comprising graphitic carbon nitride and poly-1-amino-2-mercaptobenzene (G-C3N4/PA2MB). This composite forms a porous network of 150 nm, exhibiting excellent photon absorption capabilities extending into the infrared (IR) region and a bandgap value of 1.5 eV. In the H2 gas production process, a three-electrode cell is configured using wastewater as both the electrolyte and self-sacrificing agent. The photocathode demonstrates a remarkable hydrogen production rate of 22 µmole/h for every 10 cm2, accompanied by an achieved current density (Jph) of − 0.012 mA/cm2. Furthermore, the photocathode's performance is evaluated under various optical photon energies ranging from 3.6 to 1.7 eV, revealing its sensitivity to different photon energies and resulting in varied Jph values.

This promising G-C3N4/PA2MB photocathode, fabricated through a one-pot process, serves as an exceptional electrode capable of utilizing wastewater to produce green hydrogen gas. Its efficacy in harnessing photon energy from various sources and its ability to operate effectively in wastewater environments make it a valuable asset for sustainable hydrogen generation initiatives.