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FeNC Electrocatalysts with Densely Accessible FeN4 Sites for Efficient Oxygen Reduction Reaction
Open accessAbstract
The development of iron and nitrogen co‐doped carbon (FeNC) electrocatalysts for the oxygen reduction reaction (ORR) in proton‐exchange membrane fuel cells (PEMFCs) is a grand challenge due to the low density of accessible FeN 4 sites. Here, an in situ trapping strategy using nitrogen‐rich molecules (e.g., melamine, MA) is demonstrated to enhance the amount of accessible FeN 4 sites in FeNC electrocatalysts. The melamine molecules can participate in the coordination of Fe ions in zeolitic imidazolate frameworks to form FeN 6 sites within precursors. These FeN 6 sites are then converted into atomically dispersed FeN 4 sites during a pyrolytic process. Remarkably, the FeNC/MA exhibits a high single‐atom Fe content (3.5 wt.%), a large surface area (1160 m 2 g−1), and a high density of accessible FeN 4 sites (45.7 × 10 19 sites g−1). As a result, FeNC/MA shows a much enhanced ORR activity with a half‐wave potential of 0.83 V (vs the reversible hydrogen electrode) in a 0.5 m H 2 SO 4 electrolyte solution and a good performance in a PEMFC system with an activity of 80 mA cm−2 at 0.8 V under 1.0 bar H 2/air. This work offers a promising approach toward high‐performance carbon‐based ORR electrocatalysts.
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Cited by
Boosting Oxygen Electrocatalytic Activity of Fe–N–C Catalysts by Phosphorus Incorporation
Zhou, Y., Lu, R., Tao, X., Qiu, Z., Chen, G., Yang, J., Zhao, Y., Feng, X., & Müllen, K. (2023) · Journal of the American Chemical Society · doi:10.1021/jacs.2c12933 · Cited by 567
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Metadata
- Authors
- Zhou, Y., Chen, G., Wang, Q., Wang, D., Tao, X., Zhang, T., Feng, X., & Müllen, K.
- Venue
- Advanced Functional Materials
- Publisher
- Wiley
- Published
- 2021-06-17
- Volume
- 31
- Issue
- 34
- ISSN
- 1616-301X (ISSN-L)
- 1616-3028
- OpenAlex
- W3173963355
- Cited by
- 215
- References
- 10
- FWCI
- 6.76
- Type
- journal article
- Language
- en
- Open access
- hybrid
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- Zhou, Y., Chen, G., Wang, Q., Wang, D., Tao, X., Zhang, T., Feng, X., & Müllen, K. (2021). FeNC Electrocatalysts with Densely Accessible FeN4 Sites for Efficient Oxygen Reduction Reaction. Advanced Functional Materials. https://doi.org/10.1002/adfm.202102420
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