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- W4307336137 abstract "Abstract Beyond great advances in initial activity, Fe-N-C catalysts face the next challenge of stability issue in acidic medium that must be overcome to replace Pt in fuel cell cathode. However, the complex phenomena in fuel cells and consequential difficulty in understanding deactivation mechanisms of Fe-N-C cathodes impede solutions for prolonged stability. Here, we show time-resolved changes in active site density (SD) and turnover frequency (TOF) of Fe-N-C along with concurrent decrease in oxygen reduction reaction (ORR) current in temperature/gas controllable gas-diffusion electrode (GDE) flow cell. In operando diagnosis of Fe leaching identifies a strong dependence of SD changes on operating parameters, and draws a lifetime-dependent stability diagram that reveals a shift in prime degradation mechanism during the operations. A proof-of-concept strategy with site-isolated Pt ions as a non-catalytic stabilizer, supported by theoretical calculation, demonstrates enhanced fuel cell stability with reduced Fe dissolution, offering new design principle for durable Fe-N-C catalysts." @default.
- W4307336137 created "2022-10-31" @default.
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- W4307336137 date "2022-10-26" @default.
- W4307336137 modified "2023-10-14" @default.
- W4307336137 title "Unraveling the complex causality behind the Fe-N-C degradation in fuel cell" @default.
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- W4307336137 doi "https://doi.org/10.21203/rs.3.rs-2130764/v1" @default.
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