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<p>Developing high performance Pt-based catalyst for oxygen reduction reactions (ORR) is urgent for the large-scale application of proton exchange membrane fuel cells (PEMFCs). The stability of Pt-based catalyst is extremely restricted for its carbon support corrosion and the accompanied Pt dissolution under PEMFCs’ working conditions. Herein, we synthesized a PtNi/10% Mo, C-TiO<sub>2</sub> catalyst by in situ loading rough PtNi nanoalloys onto the Mo, C co-doped TiO<sub>2</sub> nanoflowers. The interactions between PtNi alloys and TiO<sub>2</sub>-based support, which can be effectively adjusted by the incorporation of Mo and C dopants, modulated the electronic state on the Pt surface and inhibited the dissolution of PtNi nanoparticles, leading to outstanding performance for the ORR in 0.1&#xa0;M HClO<sub>4</sub> solution. The half wave potential (<i>E</i><sub>1/2</sub>) of PtNi/10% Mo, C-TiO<sub>2</sub> achieved 0.906&#xa0;V vs. RHE, which is 51&#xa0;mV higher than commercial 20 wt % Pt/C. Moreover, the mass activity (MA @0.9&#xa0;V vs. RHE) of PtNi/10% Mo, C-TiO<sub>2</sub> reached 4.0 times higher than 20 wt % Pt/C. After 10,000 cycles accelerated degradation test (ADT) between 0.6&#xa0;V and 1.0&#xa0;V, PtNi/10% Mo, C-TiO<sub>2</sub> only showed 5.6% and 1.9% degradation on MA and SA, expressing excellent stability under acidic condition. This work offered an effective approach to develop efficient and stable non-carbon supported Pt catalyst for ORR under strong acidic conditions.</p>

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Surface-rough PtNi alloys loaded on Mo, C-doped TiO2 nanoflowers as efficient and durable catalyst for oxygen reduction reaction in strong acidic medium

  • 期刊论文

  • 发表日期：

    2025年4月23日

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  • Yong-Zhi Su,
  • Kun-Zu Yang,
  • Peng-Peng Guo,
  • Xin Liu,
  • Ping-Jie Wei,
  • Chao Xu,
  • Jin-Gang Liu

摘要

Developing high performance Pt-based catalyst for oxygen reduction reactions (ORR) is urgent for the large-scale application of proton exchange membrane fuel cells (PEMFCs). The stability of Pt-based catalyst is extremely restricted for its carbon support corrosion and the accompanied Pt dissolution under PEMFCs’ working conditions. Herein, we synthesized a PtNi/10% Mo, C-TiO2 catalyst by in situ loading rough PtNi nanoalloys onto the Mo, C co-doped TiO2 nanoflowers. The interactions between PtNi alloys and TiO2-based support, which can be effectively adjusted by the incorporation of Mo and C dopants, modulated the electronic state on the Pt surface and inhibited the dissolution of PtNi nanoparticles, leading to outstanding performance for the ORR in 0.1 M HClO4 solution. The half wave potential (E1/2) of PtNi/10% Mo, C-TiO2 achieved 0.906 V vs. RHE, which is 51 mV higher than commercial 20 wt % Pt/C. Moreover, the mass activity (MA @0.9 V vs. RHE) of PtNi/10% Mo, C-TiO2 reached 4.0 times higher than 20 wt % Pt/C. After 10,000 cycles accelerated degradation test (ADT) between 0.6 V and 1.0 V, PtNi/10% Mo, C-TiO2 only showed 5.6% and 1.9% degradation on MA and SA, expressing excellent stability under acidic condition. This work offered an effective approach to develop efficient and stable non-carbon supported Pt catalyst for ORR under strong acidic conditions.