Self-humidifying Pt-C/Pt-TiO2dual-catalyst electrode membrane assembly for proton-exchange membrane fuel cells

H. N. Yang, W. H. Lee, B. S. Choi, Y. D. Ko, S. C. Yi, W. J. Kim

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

A high-performance Pt-C/Pt-TiO2dual-catalyst electrode was prepared and found to exhibit excellent water production and retention in self-humidifying proton-exchange membrane fuel cells. Different weight fractions of xPt-C/(1‒x)Pt-TiO2dual-catalyst layer were applied to both anode and cathode with fixed total Pt loadings of 0.2 mg/cm2and 0.3 mg/cm2. The dependence of cell performance on the Pt-TiO2content in dual-catalyst electrode was highly affected by the relative humidity (RH): When the RH was lower than 60%, the cell performance was significantly affected by the Pt-TiO2content. The ability to produce and retain water of the Pt-TiO2catalyst layer on the anode side was very important for the zero-RH cell performance. A visual cell experiment clearly revealed that water production at the anode was highly dependent on the Pt-TiO2content in the Pt-C/Pt-TiO2dual layer on the anode side. A half dual-layer experiment involving the Pt-TiO2on the cathode side alone strongly suggested that zero-RH operation is impracticable. The Pt-TiO2in the dual layer at the anode produces water consuming the H2and O2crossing the membrane from the cathode, resulting in excellent cell performance under zero RH. The Pt-C/Pt-TiO2ratio must be optimized in terms of the water-production and retention ability.

Original languageEnglish
Pages (from-to)12-19
Number of pages8
JournalEnergy
Volume120
DOIs
StatePublished - 2017 Jan 1

Keywords

  • Anode
  • Dual-catalyst electrode
  • Retention
  • Visual cell
  • Water production
  • Zero humidity

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