Laser-perforated anode gas diffusion layers for direct methanol fuel cells

Abdullah Alrashidi, Hongtan Liu

Research output: Contribution to journalArticlepeer-review

Abstract

Novel anode gas diffusion layers (AGDLs) with both hydrophobic and hydrophilic pathways are created to enhance transfer of both methanol and CO2. Such AGDLs are created by perforating PTFE-treated AGDLs with laser, so that the original pores/pathways in the AGDL are hydrophobic and the laser perforations are hydrophilic, thus providing easy transport paths for both the liquid methanol solution and CO2. One of the novel AGDLs has increased the cell performance by 32% over the non-perforated AGDL. Results of electrochemical impedance spectroscopy (EIS) show that the main reason for the performance enhancement is due to the reduction in mass transfer resistance. Additionally, there is a reduction in charge transfer resistances due to the enhanced methanol transfer to the catalyst layer. The results of linear sweep voltammetry (LSV) show that the perforations increase methanol crossover, thus if perforation density of the AGDL is too high, the cell performances are lower than that of the virgin AGDL.

Original languageEnglish (US)
Pages (from-to)17886-17896
Number of pages11
JournalInternational Journal of Hydrogen Energy
Volume46
Issue number34
DOIs
StatePublished - May 17 2021

Keywords

  • Direct methanol fuel cells (DMFCs)
  • GDL Gas diffusion layers
  • Laser perforation

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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