Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
Publication date: 16th December 2024
Single-atomic iron-nitrogen-carbon (Fe-N-C) designs are emerging as a possible alternative to noble-metal catalysts for the oxygen reduction process (ORR), which is critical for improving fuel cell performance. However, the broader deployment of Fe-N-C in fuel cells has been hampered by intrinsic activity and durability constraints. In this work, we present TiNC@Fe-NC, a highly efficient catalyst composed of dense Fe single atoms doped onto nitrogen carbon and supported by TiNC structures, which was produced from MXene@ZIF hybrid composite. The combination of single-atom Fe and TiNC increases the density of accessible active sites, boosts intrinsic activity, and inhibits the Fenton reaction. The TiNC@Fe-NC catalysts demonstrated a half-wave potential (E1/2) of 0.850 V in 0.5M H2SO4. These catalysts proved highly durable, with just a 6 mV change in E1/2 after 10,000 cycles in 0.5M H2SO4. This approach provides a viable route for creating platinum-free catalysts for energy storage and conversion applications.
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