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<p>This study optimized and applied a carbon cloth-supported gas diffusion electrode (GDE) for the efficient electrogeneration of hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) in acidic media using oxygen reduction reaction (ORR). The optimized conditions applied included a catalytic layer loading of 15&#xa0;mg cm<sup>-2</sup> and 20%wt poly(tetrafluoroethylene) (PTFE), which resulted in the production of 1,406 mg L<sup>− 1</sup>H<sub>2</sub>O<sub>2</sub> at 50&#xa0;mA cm<sup>-2</sup>, with a current efficiency of 33.2% and energy consumption of 163.8 kJ kg<sup>-1</sup>. Atmospheric air proved to be an effective sustainable O<sub>2</sub>(g) source, as its application yielded 1,044 mg L<sup>-1</sup> of H<sub>2</sub>O<sub>2</sub>, with a 9% current efficiency reduction compared to ultrapure O<sub>2</sub>(g). The electrochemical system was successfully applied for the effective degradation of sulfamethoxazole (SFX) via Electro-Fenton (EF) and Photo-Electro-Fenton (PEF) processes, where complete SFX removal was achieved within 20 and 15&#xa0;min of electrolysis, respectively. The PEF process exhibited higher mineralization (55.9%) compared to EF (22.1%), and this was primarily attributed to UVA-enhanced Fe<sup>2+</sup> regeneration. The results of this study highlighted the potential of the optimized GDE for application toward sustainable in situ H<sub>2</sub>O<sub>2</sub> production and emerging pollutant treatment using atmospheric air as a precursor source of O<sub>2</sub>(g).</p> Graphical Abstract <p></p>

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Air-driven carbon diffusion electrodes for in situ H2O2 generation and water remediation

  • 期刊论文

  • 发表日期：

    2026年1月14日

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  • Beatriz T. Marin,
  • Matheus S. Kronka,
  • Fausto E. Bimbi Júnior,
  • Guilherme V. Fortunato,
  • Alexsandro J. dos Santos,
  • Renata Colombo,
  • Marcos R. V. Lanza

摘要

This study optimized and applied a carbon cloth-supported gas diffusion electrode (GDE) for the efficient electrogeneration of hydrogen peroxide (H2O2) in acidic media using oxygen reduction reaction (ORR). The optimized conditions applied included a catalytic layer loading of 15 mg cm-2 and 20%wt poly(tetrafluoroethylene) (PTFE), which resulted in the production of 1,406 mg L− 1H2O2 at 50 mA cm-2, with a current efficiency of 33.2% and energy consumption of 163.8 kJ kg-1. Atmospheric air proved to be an effective sustainable O2(g) source, as its application yielded 1,044 mg L-1 of H2O2, with a 9% current efficiency reduction compared to ultrapure O2(g). The electrochemical system was successfully applied for the effective degradation of sulfamethoxazole (SFX) via Electro-Fenton (EF) and Photo-Electro-Fenton (PEF) processes, where complete SFX removal was achieved within 20 and 15 min of electrolysis, respectively. The PEF process exhibited higher mineralization (55.9%) compared to EF (22.1%), and this was primarily attributed to UVA-enhanced Fe2+ regeneration. The results of this study highlighted the potential of the optimized GDE for application toward sustainable in situ H2O2 production and emerging pollutant treatment using atmospheric air as a precursor source of O2(g).

Graphical Abstract