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<p>The rising demand for clean energy has driven researchers to adopt electrochemical water splitting as promising route for sustainable hydrogen production. In this study, a SrZrO₃/PANI composite was synthesized via hydrothermal method, utilizing the catalytic activity of SrZrO<sub>3</sub> and superior conductivity of PANI. This synergistic integration facilitated efficient charge transfer and active site exposure, resulting in enhanced HER activity in alkaline conditions. Structural analysis through X-ray diffraction (XRD) confirmed crystalline nature of SrZrO<sub>3</sub> and amorphous structure of PANI, with no phase transformation upon composite formation. Scanning electron microscopy (SEM) revealed compact and interconnected morphology with SrZrO<sub>3</sub> particles unevenly embedded in polymer matrix. The average crystallite size determined by Debye-Scherrer equation was within nanoscale range, and BET analysis showed a significant increase in surface area and pore volume, facilitating faster ion diffusion and improved charge transport during HER. Electrochemical measurements demonstrated excellent catalytic activity, with the optimized composite exhibiting a low overpotential of -230 mV at -10&#xa0;mA/cm<sup>2</sup>, a Tafel slope of 64 mV/dec, improved charge transfer kinetics (R<sub>s</sub> = 0.3 Ω) and a high ECSA of 429.5 cm<sup>2</sup>. Moreover, the composite achieved a turnover frequency (TOF) of 2.20&#xa0;s<sup>− 1</sup> and maintained stable performance over 70&#xa0;h with higher stability after 5000th cycle. These results establish SrZrO<sub>3</sub>/PANI as a highly efficient and durable electrocatalyst for practical hydrogen production in alkaline environment.</p>

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Polyaniline-Integrated SrZrO3 Composite: A Cost-Effective Catalyst for Hydrogen Evolution Reaction

  • 期刊论文

  • 发表日期：

    2025年9月18日

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  • Saad Alshammari

摘要

The rising demand for clean energy has driven researchers to adopt electrochemical water splitting as promising route for sustainable hydrogen production. In this study, a SrZrO₃/PANI composite was synthesized via hydrothermal method, utilizing the catalytic activity of SrZrO3 and superior conductivity of PANI. This synergistic integration facilitated efficient charge transfer and active site exposure, resulting in enhanced HER activity in alkaline conditions. Structural analysis through X-ray diffraction (XRD) confirmed crystalline nature of SrZrO3 and amorphous structure of PANI, with no phase transformation upon composite formation. Scanning electron microscopy (SEM) revealed compact and interconnected morphology with SrZrO3 particles unevenly embedded in polymer matrix. The average crystallite size determined by Debye-Scherrer equation was within nanoscale range, and BET analysis showed a significant increase in surface area and pore volume, facilitating faster ion diffusion and improved charge transport during HER. Electrochemical measurements demonstrated excellent catalytic activity, with the optimized composite exhibiting a low overpotential of -230 mV at -10 mA/cm2, a Tafel slope of 64 mV/dec, improved charge transfer kinetics (Rs = 0.3 Ω) and a high ECSA of 429.5 cm2. Moreover, the composite achieved a turnover frequency (TOF) of 2.20 s− 1 and maintained stable performance over 70 h with higher stability after 5000th cycle. These results establish SrZrO3/PANI as a highly efficient and durable electrocatalyst for practical hydrogen production in alkaline environment.