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<p>Pyocyanin, a redox-active secondary metabolite produced by <i>Pseudomonas aeruginosa</i>, shows immense potential in biotechnology, environmental, and energy applications. However, its large-scale use is restricted due to low production yields, cost constraints, and pathogenicity concerns associated with its producer strains. This study addressed these limitations by optimizing pyocyanin production using a plant-associated <i>P. aeruginosa</i> P4 strain, achieving over 2.5-fold higher yields compared to other strains. Enhanced pyocyanin production was achieved through a customized carbon source cocktail and phosphate-limited media, with downstream purification confirmed through spectroscopic analyses. Electrocatalytic applications of pyocyanin were explored through the fabrication of nickel foam-supported electrodes via a dip-coating process. The resulting pyocyanin electrode exhibited superior catalytic activity for hydrogen evolution (HER) and oxygen evolution reactions (OER) in alkaline media, requiring low overpotentials of 276 mV and 290 mV (vs. RHE) at 100&#xa0;mA/cm², respectively. The catalyst embedded electrode demonstrated excellent stability over 32&#xa0;h of operation, highlighting its efficiency and durability. This study underscores the potential of the versatile pyocyanin as a prospective low-cost, biogenic catalyst for sustainable electrochemical hydrogen production and establishes a foundation for its scalable production and application in renewable energy systems in future.</p>

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Biogenic pyocyanin-modified nickel foam electrodes for enhanced electrochemical water splitting and sustainable green hydrogen production

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月29日

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  • Riya Dave,
  • Ishita Mirchandani,
  • Pooja Sharma,
  • CK Sumesh,
  • Aditi Buch

摘要

Pyocyanin, a redox-active secondary metabolite produced by Pseudomonas aeruginosa, shows immense potential in biotechnology, environmental, and energy applications. However, its large-scale use is restricted due to low production yields, cost constraints, and pathogenicity concerns associated with its producer strains. This study addressed these limitations by optimizing pyocyanin production using a plant-associated P. aeruginosa P4 strain, achieving over 2.5-fold higher yields compared to other strains. Enhanced pyocyanin production was achieved through a customized carbon source cocktail and phosphate-limited media, with downstream purification confirmed through spectroscopic analyses. Electrocatalytic applications of pyocyanin were explored through the fabrication of nickel foam-supported electrodes via a dip-coating process. The resulting pyocyanin electrode exhibited superior catalytic activity for hydrogen evolution (HER) and oxygen evolution reactions (OER) in alkaline media, requiring low overpotentials of 276 mV and 290 mV (vs. RHE) at 100 mA/cm², respectively. The catalyst embedded electrode demonstrated excellent stability over 32 h of operation, highlighting its efficiency and durability. This study underscores the potential of the versatile pyocyanin as a prospective low-cost, biogenic catalyst for sustainable electrochemical hydrogen production and establishes a foundation for its scalable production and application in renewable energy systems in future.