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<p>Design and synthesis of highly active and durable bifunctional electrocatalysts is crucial toward oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in unitized regenerative proton exchange membrane fuel cells (UR-PEMFCs). Herein, we report a simple phase-transfer reduction method to synthesize PtIr nanoparticles with different molar ratios. When the Pt/Ir molar ratio is 2.2:1, the bifunctional oxygen activity is optimal. The ORR mass activity of Pt<sub>2.2</sub>Ir nanoparticles is 190.3 mA/mg<sub>Pt</sub> @ 0.9 V (<i>vs.</i> RHE), which is 1.8 times and 3.7 times those of commercial Pt black and physically mixed commercial Pt and Ir black (Pt+Ir black), respectively. At the potential of 1.53 V <i>vs.</i> RHE, the OER mass activity of Pt<sub>2.2</sub>Ir nanoparticles is 202.7 mA/mg<sub>Ir</sub>, which is 2.0 times and 1.3 times those of Ir black and Pt+Ir black, respectively. An overpotential gap of Pt<sub>2.2</sub>Ir nanoparticles (618 mV) between the half-wave potential of ORR and the potential at 10 mA/cm<sup>2</sup> of OER is superior to Pt+Ir black (662 mV). After durability tests, the ORR/OER activity of Pt<sub>2.2</sub>Ir nanoparticles remained much better than Pt+Ir black. X-Ray photoelectron spectroscopy suggests that the electronic interaction between Pt and Ir accounts for enhanced bifunctional oxygen activity. Eventually, the Pt<sub>2.2</sub>Ir nanoparticles were evaluated in UR-PEMFCs.</p>

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Highly Active and Durable PtIr Nanoparticles Toward Oxygen Reduction and Oxygen Evolution Reaction

  • 期刊论文

  • 发表日期：

    2025年6月27日

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  • Shuo Han,
  • Yang Lv,
  • Mengyu Yang,
  • Yongpeng Li,
  • Cui Tan,
  • Feng Liu,
  • Hao Yang,
  • Jianan Chu,
  • Miao Liu,
  • Chengyu Zhu,
  • Rui Gao,
  • Yujiang Song

摘要

Design and synthesis of highly active and durable bifunctional electrocatalysts is crucial toward oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in unitized regenerative proton exchange membrane fuel cells (UR-PEMFCs). Herein, we report a simple phase-transfer reduction method to synthesize PtIr nanoparticles with different molar ratios. When the Pt/Ir molar ratio is 2.2:1, the bifunctional oxygen activity is optimal. The ORR mass activity of Pt2.2Ir nanoparticles is 190.3 mA/mgPt @ 0.9 V (vs. RHE), which is 1.8 times and 3.7 times those of commercial Pt black and physically mixed commercial Pt and Ir black (Pt+Ir black), respectively. At the potential of 1.53 V vs. RHE, the OER mass activity of Pt2.2Ir nanoparticles is 202.7 mA/mgIr, which is 2.0 times and 1.3 times those of Ir black and Pt+Ir black, respectively. An overpotential gap of Pt2.2Ir nanoparticles (618 mV) between the half-wave potential of ORR and the potential at 10 mA/cm2 of OER is superior to Pt+Ir black (662 mV). After durability tests, the ORR/OER activity of Pt2.2Ir nanoparticles remained much better than Pt+Ir black. X-Ray photoelectron spectroscopy suggests that the electronic interaction between Pt and Ir accounts for enhanced bifunctional oxygen activity. Eventually, the Pt2.2Ir nanoparticles were evaluated in UR-PEMFCs.