Developing cost-effective, high-performance bifunctional electrocatalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is crucial for advanced clean energy technologies. This work details Sn–Fe bimetallic nanoparticles anchored on S, N-codoped graphitic carbon nitride (C3N4) -derived tubular carbon (SnFe/SNCT), which are synthesized via a facile pyrolysis method at 850 °C (SnFe/SNC₈50). The optimized SnFe/SNC₈50 catalyst, which is characterized by a distinct bamboo-like tubular morphology, demonstrates superior ORR activity with a half-wave potential (E1/2) of 0. 86 V vs RHE in 0. 1 M KOH, surpassing commercial Pt/C (0. 82 V). Furthermore, it exhibits excellent OER performance, requiring only 340 mV overpotential to achieve 10 mA cm–2, and displays remarkable overall bifunctionality. When SnFe/SNC₈50 is integrated into an anion exchange membrane fuel cell (AEMFC), it delivers a peak power density of 277 mW cm–2, significantly outperforming Pt/C-based cells (168 mW cm–2). The catalyst also demonstrates exceptional durability, with only 20 mV of E1/2 decay after 30, 000 cycles, compared to 50 mV for Pt/C. This enhanced performance is attributed to the synergistic interplay between Fe–Nx/Fe–Sx active sites and intermetallic Fe3SnC/FeS domains. These findings establish SnFe/SNC₈50 as a highly promising nonprecious-metal bifunctional electrocatalyst for practical energy-conversion applications, paving the way for sustainable clean-energy solutions.
Mekonnen et al. (Sat,) studied this question.
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