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<p>Reducing Pt loading in the anodic hydrogen oxidation reaction (HOR) and concurrently increasing mass activity and CO tolerance are essential for advancing proton exchange membrane fuel cells (PEMFCs). Here, an electrocatalyst of 1.7 wt% Pt clusters loaded on a hollow bowl-like W<sub>3</sub>O/WC heterostructure is designed to increase the anti-CO-poisoning HOR. Due to its unique electron delocalization effect, the W<sub>3</sub>O/WC heterostructure serves as a warehouse to share electrons with Pt; this simultaneously lowers the HOR barrier and accumulates the hydroxyl radicals (•OH) to accelerate CO oxidation. The Pt‒O bond originating from the oxygen spillover effect of W<sub>3</sub>O promotes hydrogen and CO oxidation, whereas the lattice‒O consumed in W<sub>3</sub>O replenished through water dissociation. The resultant electrocatalyst exhibits mass activity of 469 A g<sup>‒1</sup> at 50 mV and anti-toxicity even at 2000 ppm CO. The PEMEC delivers a peak power density of 1.63 W cm<sup>‒2</sup> and maintains considerable anti-CO poisoning performance.</p>

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Oxygen spillover on supported Pt-cluster for anti-CO-poisoning hydrogen oxidation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月24日

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  • Di Shen,
  • Fanfei Sun,
  • Zhijian Liang,
  • Bingbao Mei,
  • Ying Xie,
  • Yucheng Wang,
  • Lei Wang,
  • Honggang Fu

摘要

Reducing Pt loading in the anodic hydrogen oxidation reaction (HOR) and concurrently increasing mass activity and CO tolerance are essential for advancing proton exchange membrane fuel cells (PEMFCs). Here, an electrocatalyst of 1.7 wt% Pt clusters loaded on a hollow bowl-like W3O/WC heterostructure is designed to increase the anti-CO-poisoning HOR. Due to its unique electron delocalization effect, the W3O/WC heterostructure serves as a warehouse to share electrons with Pt; this simultaneously lowers the HOR barrier and accumulates the hydroxyl radicals (•OH) to accelerate CO oxidation. The Pt‒O bond originating from the oxygen spillover effect of W3O promotes hydrogen and CO oxidation, whereas the lattice‒O consumed in W3O replenished through water dissociation. The resultant electrocatalyst exhibits mass activity of 469 A g‒1 at 50 mV and anti-toxicity even at 2000 ppm CO. The PEMEC delivers a peak power density of 1.63 W cm‒2 and maintains considerable anti-CO poisoning performance.