Details

Autor(en) / Beteiligte

• Alipour Moghadam Esfahani, Reza
• Easton, E. Bradley

Titel

Exceptionally durable Pt/TOMS catalysts for fuel cells

Ist Teil von

• Applied catalysis. B, Environmental, 2020-07, Vol.268, p.118743, Article 118743

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• [Display omitted] •Systematic durability of study of TOMS, a conductive metal oxide catalyst support.•Pt/TOMS & Pt/C subjected to a grueling array of six accelerated stress tests.•Pt/C didn’t survive 3 tests, & retained only 32–62 % of Pt surface area in the others.•Pt/TOMS retained 85–98 % of Pt surface area in all 6 tests.•EIS confirmed Pt/TOMS has no support corrosion in tests that obliterate Pt/C. We report a systematic durability study of a platinum electrocatalyst supported on dual-doped titanium suboxide Ti3O5Mo0.2Si0.4 (TOMS) with enhanced conductivity. The highly-active Pt/TOMS catalyst was subjected to a gauntlet of seven accelerated stress tests (AST) designed to exhaustively probe durability. A commercial Pt/C was also subjected to the same ASTs. Pt/TOMS showed remarkable stability, showing only a 2–15 % decay in electrochemically active surface area (ECSA) in these 7 AST protocols, while retaining high oxygen reduction reaction (ORR) activity and showing no signs of support corrosion. Conversely, the Pt/C catalysts displayed severe degradation in ORR activity, with ECSA losses ranging between 67–100 % during the same 7 tests, while displaying support corrosion in several tests. The enhanced stability of Pt/TOMS is due to the strong metal support interaction between the doped suboxide and Pt nano-particles (NPs), which remained virtually unchanged by the aggressive AST protocols.