The DOI matches its Crossref record; 2 of the 2 references it cites were found in a registry or an index.
Unveiling N-Protonation and Anion-Binding Effects on Fe/N/C Catalysts for O2 Reduction in Proton-Exchange-Membrane Fuel Cells
Open accessAbstract
The high cost of proton-exchange-membrane fuel cells would be considerably reduced if platinum-based catalysts were replaced by iron-based substitutes, which have recently demonstrated comparable activity for oxygen reduction but whose cause of activity decay in acidic medium has been elusive. Here, we reveal that the activity of Fe/N/C catalysts prepared through a pyrolysis in NH 3 is mostly imparted by acid-resistant FeN 4 sites whose turnover frequency for the O 2 reduction can be regulated by fine chemical changes of the catalyst surface. We show that surface N-groups protonate at pH 1 and subsequently bind anions. This results in decreased activity for the O 2 reduction. The anions can be removed chemically or thermally, which restores the activity of acid-resistant FeN 4 sites. These results are interpreted as an increased turnover frequency of FeN 4 sites when specific surface N-groups protonate. These unprecedented findings provide a new perspective for stabilizing the most active Fe/N/C catalysts known to date.
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Citations
Cites
High-Performance Electrocatalysts for Oxygen Reduction Derived from Polyaniline, Iron, and Cobalt
Wu, G., More, K. L., Johnston, C. M., & Zelenay, P. (2011) · Science · doi:10.1126/science.1200832 · Cited by 3,984
Kreuer, K.-D., Paddison, S. J., Spohr, E., & Schuster, M. (2004) · Chemical Reviews · doi:10.1021/cr020715f · Cited by 2,187
Cited by
Wang, X. X., Swihart, M. T., & Wu, G. (2019) · Nature Catalysis · doi:10.1038/s41929-019-0304-9 · Cited by 1,174
(2020) · doi:10.1038/s41929-020-00545-2 · Cited by 741
PGM‐Free Cathode Catalysts for PEM Fuel Cells: A Mini‐Review on Stability Challenges
Shao, Y., Dodelet, J., Wu, G., & Zelenay, P. (2019) · Advanced Materials · doi:10.1002/adma.201807615 · Cited by 553
Self-citationCarbon as catalyst and support for electrochemical energy conversion
Trogadas, P., Fuller, T. F., & Strasser, P. (2014) · Carbon · doi:10.1016/j.carbon.2014.04.005 · Cited by 522
Shen, H., Gracia‐Espino, E., Ma, J., Zang, K., Luo, J., Wang, L., Gao, S., Mamat, X., Hu, G., Wagberg, T., et al. (2017) · Angewandte Chemie International Edition · doi:10.1002/anie.201706602 · Cited by 482
Metadata
- Authors
- Herranz, J., Jaouen, F., Lefèvre, M., Kramm, U. I., Proietti, E., Dodelet, J.-P., Bogdanoff, P., Fiechter, S., Abs-Wurmbach, I., Bertrand, P., Arruda, T. M., & Mukerjee, S.
- Venue
- The Journal of Physical Chemistry C
- Publisher
- American Chemical Society (ACS)
- Published
- 2011-07-26
- Volume
- 115
- Issue
- 32
- Pages
- 16087-16097
- ISSN
- 1932-7447 (ISSN-L)
- 1932-7455
- OpenAlex
- W1698407690
- Cited by
- 353
- References
- 2
- FWCI
- 5.91
- Type
- journal article
- Language
- en
- Open access
- green
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