Scholarlink

<p>Scaling proton exchange membrane fuel cells (PEMFCs) demands efficient and durable electrocatalysts for the cathodic oxygen reduction reaction (ORR). Concave surfaces and intermetallic phases have been proven to promote the activity and stability of Pt-based catalysts, yet integrating these two structural features in one catalyst remains challenging. Herein, we achieve this in a class of intermetallic, concave tetrahedral Pt<sub>3</sub>In (i-ct-Pt<sub>3</sub>In), through a sequential Pt(111)-selective wet-chemical etching and indium-enabled morphology-preservable annealing. The i-ct-Pt<sub>3</sub>In/C catalyst delivers a mass activity of 2.49 A mg<sub>Pt</sub><sup>−1</sup> in acidic media, preserving 97.8% of its activity after 30,000 cycles. In phosphate-containing electrolytes, it achieves a mass activity of 0.3 A mg<sub>Pt</sub><sup>−1</sup>, representing a 7.5-fold improvement over commercial Pt/C and translating to a peak power density of&#xa0;1.0 W cm<sup>−2</sup> in a high-temperature PEMFC at 160 °C. Theoretical calculations verify weakened adsorption of oxygenates and phosphate anions on concave Pt<sub>3</sub>In(111) relative to flat Pt(111), accounting for enhanced ORR kinetics and phosphate tolerance. This work highlights the potential of ordering morphological nanocrystals for energy electrocatalysis.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Intermetallic Pt3In concave tetrahedra for oxygen reduction electrocatalysis in proton exchange membrane fuel cells

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月16日

查看全文
  • Wenhe Yu,
  • Menggang Li,
  • Lu Li,
  • Xiaowen Wu,
  • Wenqian Zhu,
  • Zehong Yin,
  • Hongyu Guo,
  • Nan-Nan Liang,
  • Quanquan Pang,
  • Biao Li,
  • Xin Gao,
  • Jing Xia,
  • Jin-Song Hu,
  • Mingchuan Luo,
  • Shaojun Guo

摘要

Scaling proton exchange membrane fuel cells (PEMFCs) demands efficient and durable electrocatalysts for the cathodic oxygen reduction reaction (ORR). Concave surfaces and intermetallic phases have been proven to promote the activity and stability of Pt-based catalysts, yet integrating these two structural features in one catalyst remains challenging. Herein, we achieve this in a class of intermetallic, concave tetrahedral Pt3In (i-ct-Pt3In), through a sequential Pt(111)-selective wet-chemical etching and indium-enabled morphology-preservable annealing. The i-ct-Pt3In/C catalyst delivers a mass activity of 2.49 A mgPt−1 in acidic media, preserving 97.8% of its activity after 30,000 cycles. In phosphate-containing electrolytes, it achieves a mass activity of 0.3 A mgPt−1, representing a 7.5-fold improvement over commercial Pt/C and translating to a peak power density of 1.0 W cm−2 in a high-temperature PEMFC at 160 °C. Theoretical calculations verify weakened adsorption of oxygenates and phosphate anions on concave Pt3In(111) relative to flat Pt(111), accounting for enhanced ORR kinetics and phosphate tolerance. This work highlights the potential of ordering morphological nanocrystals for energy electrocatalysis.