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<p>The electropolymerization method was explored for 5,10,15,20-tetrakis(4-nitrophenyl)porphyrin (TNPP) and its nickel(II) complex, (Ni-TNPP), by electroreduction. The resulting films on glassy carbon electrodes (GCE) were investigated for their properties and potential as electrocatalysts for the hydrogen evolution reaction (HER). The active surface area of Ni-TNPP-GCE is 6.8 times higher than that of TNPP-GCE. Notably, Ni-TNPP-GCE exhibited an overpotential of 340 mV with a Tafel slope of 95 mV/dec, a R<sub>CT</sub> value of 1.612 Ω, and a R<sub>s</sub> value of 42.23 Ω. Therefore, in a neutral PBS solution, the electrocatalyst Ni-TNPP-GCE exhibits better electrocatalytic activity than TNPP-GCE. This approach offers a promising pathway for low-cost, efficient hydrogen production and highlights potential alternatives to noble metals in catalysis.</p> Graphical Abstract <p></p>

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Controlled Electropolymerization Through Electroreduction of Tetrakis-(4-nitrophenyl)porphyrinato nickel(II) for Electrocatalytic Hydrogen Evolution Reaction

  • 期刊论文

  • 发表日期：

    2025年12月2日

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  • Kumaresan Sudharsan,
  • Thangaraj Keerthana,
  • Baskaran Sarikalakshmi,
  • Sekar Monisha,
  • Samuthirakani AjithKumar,
  • Venkatesh Soundharya,
  • Palanisamy Kalimuthu

摘要

The electropolymerization method was explored for 5,10,15,20-tetrakis(4-nitrophenyl)porphyrin (TNPP) and its nickel(II) complex, (Ni-TNPP), by electroreduction. The resulting films on glassy carbon electrodes (GCE) were investigated for their properties and potential as electrocatalysts for the hydrogen evolution reaction (HER). The active surface area of Ni-TNPP-GCE is 6.8 times higher than that of TNPP-GCE. Notably, Ni-TNPP-GCE exhibited an overpotential of 340 mV with a Tafel slope of 95 mV/dec, a RCT value of 1.612 Ω, and a Rs value of 42.23 Ω. Therefore, in a neutral PBS solution, the electrocatalyst Ni-TNPP-GCE exhibits better electrocatalytic activity than TNPP-GCE. This approach offers a promising pathway for low-cost, efficient hydrogen production and highlights potential alternatives to noble metals in catalysis.

Graphical Abstract