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<p>Perovskite oxides exhibit electrocatalysis for oxygen evolution reaction. However, low electronic conductivity and sluggish kinetics limit their electrocatalytic performance. In this work, a unique conductive additive has been used with a perovskite oxide for enhancing the catalytic activity towards oxygen evolution reaction. La<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Cu<sub>0.2</sub>O<sub>3-δ</sub> is prepared by solution auto-combustion method. A porous carbon, obtained by the HF etching of silicon oxycarbide derived from the pyrolysis of a polysilsesquioxane preceramic polymer, is used as an additive with the perovskite oxide. The prepared La<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Cu<sub>0.2</sub>O<sub>3-δ</sub>&#xa0;/C catalyst exhibits a substantially lowered overpotential of 380&#xa0;mV for oxygen evolution reaction, with a lower Tafel slope of 49&#xa0;mV dec<sup>−1</sup>. The catalyst remained stable for a prolonged duration with enhanced mass activity and specific activity. The improved catalytic performance of the composite is attributed to the highly porous and conductive oxycarbide-derived carbon, which enhances the electronic conductivity and provides a fast diffusion pathway between the electrolyte and the working electrode surface. This research aims to exhibit the effect of adding carbon derived from silicon oxycarbide obtained at different pyrolysis temperatures on the electrocatalytic properties of a semiconducting perovskite oxide.</p>

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Enhanced electrocatalytic activity for OER in La0.5Sr0.5Co0.8Cu0.2O3-δ perovskite oxide with oxycarbide-derived carbon

  • 期刊论文

  • 发表日期：

    2025年2月26日

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  • Kumar Sanket,
  • Rupesh Mandal,
  • Ashutosh Das,
  • Ananya Parida,
  • Swadesh K. Pratihar,
  • Shantanu K. Behera

摘要

Perovskite oxides exhibit electrocatalysis for oxygen evolution reaction. However, low electronic conductivity and sluggish kinetics limit their electrocatalytic performance. In this work, a unique conductive additive has been used with a perovskite oxide for enhancing the catalytic activity towards oxygen evolution reaction. La0.5Sr0.5Co0.8Cu0.2O3-δ is prepared by solution auto-combustion method. A porous carbon, obtained by the HF etching of silicon oxycarbide derived from the pyrolysis of a polysilsesquioxane preceramic polymer, is used as an additive with the perovskite oxide. The prepared La0.5Sr0.5Co0.8Cu0.2O3-δ /C catalyst exhibits a substantially lowered overpotential of 380 mV for oxygen evolution reaction, with a lower Tafel slope of 49 mV dec−1. The catalyst remained stable for a prolonged duration with enhanced mass activity and specific activity. The improved catalytic performance of the composite is attributed to the highly porous and conductive oxycarbide-derived carbon, which enhances the electronic conductivity and provides a fast diffusion pathway between the electrolyte and the working electrode surface. This research aims to exhibit the effect of adding carbon derived from silicon oxycarbide obtained at different pyrolysis temperatures on the electrocatalytic properties of a semiconducting perovskite oxide.