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<p>Platinum supported on reduced graphene oxide doped with sulfur and nitrogen (Pt/NSC) is presented in this study as an efficient electrocatalyst for energy-related reduction reactions, namely hydrogen evolution (HER) and oxygen reduction (ORR). A thermally stable poly bis(thiophen-2-yl methylidene) hydrazine serves as a single-source precursor for dual heteroatom doping with nitrogen and sulfur. The Pt/NSC catalyst exhibits an overpotential of only 19 mV vs. RHE at a current density of 10&#xa0;mA cm⁻², outperforming commercial 20% Pt/C (42 mV). Its lower activation barrier, revealed by Tafel slope analysis, further confirms enhanced kinetics. RDE linear sweep voltammetry indicates a favorable four-electron pathway, suitable for fuel cell applications. Accelerated stress testing confirms excellent durability for ORR. These results demonstrate that heteroatom doping and the least Pt content significantly improve ORR/HER electrocatalytic activity. Material and electrochemical characterization validate the design and efficiency of Pt/NSC, supporting its potential as a cost-effective electrocatalyst.</p>

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Tailored Pt–rGO Catalyst with Dual Heteroatom Doping: A Synergistic Leap in HER and ORR Electrocatalysis

  • 期刊论文

  • 发表日期：

    2025年11月28日

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  • C Renugadevi,
  • Abhay Pratap Singh,
  • L Cindrella

摘要

Platinum supported on reduced graphene oxide doped with sulfur and nitrogen (Pt/NSC) is presented in this study as an efficient electrocatalyst for energy-related reduction reactions, namely hydrogen evolution (HER) and oxygen reduction (ORR). A thermally stable poly bis(thiophen-2-yl methylidene) hydrazine serves as a single-source precursor for dual heteroatom doping with nitrogen and sulfur. The Pt/NSC catalyst exhibits an overpotential of only 19 mV vs. RHE at a current density of 10 mA cm⁻², outperforming commercial 20% Pt/C (42 mV). Its lower activation barrier, revealed by Tafel slope analysis, further confirms enhanced kinetics. RDE linear sweep voltammetry indicates a favorable four-electron pathway, suitable for fuel cell applications. Accelerated stress testing confirms excellent durability for ORR. These results demonstrate that heteroatom doping and the least Pt content significantly improve ORR/HER electrocatalytic activity. Material and electrochemical characterization validate the design and efficiency of Pt/NSC, supporting its potential as a cost-effective electrocatalyst.