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<p>Gas diffusion layers (GDLs) are important components of fuel cells, which play important roles in supporting catalyst layer, collecting current, transmitting gas and managing water reaction product in fuel cells. Due to the carbon corrosion issue, however, the durability of GDLs is still not satisfied. Herein, a duplex oxidation–reduction treatment is adopted to tune the <i>sp</i><sup>3</sup>/<i>sp</i><sup>2</sup> hybridization of CNTs in GDLs. XRD, FTIR and Raman spectroscopies measurement elucidated that, the <i>sp</i><sup>3</sup>/<i>sp</i><sup>2</sup> ratio of GDLs was precisely tuned by duplex oxidation–reduction treatment, which enhanced the electrochemical stability and electric conductivity of GDLs. When duplex oxidation–reduction treated GDLs were assembled to single fuel cells, a high power-density (838 mW cm<sup>−2</sup>) was achieved, which was much higher than that of untreated GDLs (571 mW cm<sup>−2</sup>). Because the output power-density of single fuel cells in this paper is similar to that of commercial GDLs assembled fuel cells (908 mW cm<sup>−2</sup>), the s–p hybridization route will provide fruitful highlights to overcome carbon corrosion and find promising applications in the fields of fuel cells.</p> Graphical Abstract <p></p>

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Tuning sp3/sp2 Carbon Hybridization to Realize Highly Durable Gas Diffusion Layers (GDLs) for Fuel Cells

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Tang Yu,
  • Ge Jing,
  • Yu Jun-kai,
  • Su Zhi-peng,
  • Yang Si-cheng,
  • Shu-hong Liu,
  • Li Zhu-xin,
  • Zhao Hong,
  • Zhang Yong

摘要

Gas diffusion layers (GDLs) are important components of fuel cells, which play important roles in supporting catalyst layer, collecting current, transmitting gas and managing water reaction product in fuel cells. Due to the carbon corrosion issue, however, the durability of GDLs is still not satisfied. Herein, a duplex oxidation–reduction treatment is adopted to tune the sp3/sp2 hybridization of CNTs in GDLs. XRD, FTIR and Raman spectroscopies measurement elucidated that, the sp3/sp2 ratio of GDLs was precisely tuned by duplex oxidation–reduction treatment, which enhanced the electrochemical stability and electric conductivity of GDLs. When duplex oxidation–reduction treated GDLs were assembled to single fuel cells, a high power-density (838 mW cm−2) was achieved, which was much higher than that of untreated GDLs (571 mW cm−2). Because the output power-density of single fuel cells in this paper is similar to that of commercial GDLs assembled fuel cells (908 mW cm−2), the s–p hybridization route will provide fruitful highlights to overcome carbon corrosion and find promising applications in the fields of fuel cells.

Graphical Abstract