Editors’ Choice—Necessity to Avoid Titanium Oxide as Electrocatalyst Support in PEM Fuel Cells: A Membrane Durability Study

Zhang, Jingxin; Coms, Frank; Kumaraguru, Swami

doi:10.1149/1945-7111/abe5e9

Editors’ Choice—Necessity to Avoid Titanium Oxide as Electrocatalyst Support in PEM Fuel Cells: A Membrane Durability Study

Journal Article · 01 February 2021 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1945-7111/abe5e9· OSTI ID:1848542

; ; Kumaraguru, Swami

Pt/TiO₂as electrocatalyst was found to significantly increase the rate of the membrane chemical degradation in a polymer electrolyte membrane (PEM) fuel cell. The increased degradation was proved to be due to TiO_x(TiO₂or Ti₄O₇), which is widely recognized as a promising corrosion-resistant electrocatalyst support. The membrane degradation (thinning) appears to be preferentially in the side facing anode electrode. Migrated Ti species as a result of TiO_xdissolution during fuel cell operation in an acidic environment was quantified by electron probe microanalysis (EPMA). Total fluorine inventory loss of the membrane strongly depends on the quantity of migrated Ti species (likely Ti³⁺and/or Ti⁴⁺). The membrane chemical degradation induced by TiO_xis proposed to be due to dissolved ionic Ti species reacting with H₂O₂through a Fenton reaction. TiO_xis determined to beinviableaselectrocatalyst supportfor PEM fuel cells, and future research is suggested to be directed toward alternative oxides with similar corrosion-resistance.

Research Organization:: General Motors LLC, Detroit, MI (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

DOE Contract Number:: EE0007651

OSTI ID:: 1848542

Journal Information:: Journal of the Electrochemical Society, Vol. 168, Issue 2; ISSN 0013-4651

Publisher:: IOP Publishing - The Electrochemical Society

Country of Publication:: United States

Language:: English

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