Zobrazeno 1 - 10 of 95 pro vyhledávání: '"Ulrike I Kramm"'
1
Akademický článek
Role of Fe in the hydrogen oxidation reaction in a NiFe-based catalyst: an in situ Mössbauer spectroscopic investigation
Autor: Lingmei Ni, Elena S Davydova, Ramesh K Singh, Lubov Kolik-Shmuel, Dario R Dekel, Ulrike I Kramm
Publikováno v: JPhys Energy, Vol 5, Iss 3, p 034009 (2023)
Nickel-based catalysts reach a high activity for the hydrogen oxidation reaction (HOR) in anion exchange membrane fuel cells. While incorporation of iron significantly decreases the HOR overpotential on NiFe-based catalysts, the reason for the enhanc
Externí odkaz: https://doaj.org/article/167745c55a434693ad7dd8b02a3a22ca
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2
Akademický článek
Active Site Identification in FeNC Catalysts and Their Assignment to the Oxygen Reduction Reaction Pathway by In Situ 57Fe Mössbauer Spectroscopy
Autor: Lingmei Ni, Charlotte Gallenkamp, Stephen Paul, Markus Kübler, Pascal Theis, Sonia Chabbra, Kathrin Hofmann, Eckhard Bill, Alexander Schnegg, Barbara Albert, Vera Krewald, Ulrike I. Kramm
Publikováno v: Advanced Energy & Sustainability Research, Vol 2, Iss 2, Pp n/a-n/a (2021)
FeNC catalysts are the most promising substitutes for Pt‐based catalysts for the oxygen reduction reaction in proton exchange fuel cells. However, it remains unclear which FeN4 moieties contribute to the reaction mechanism and in which way. The ori
Externí odkaz: https://doaj.org/article/fbd9f52a242345c496530d144a8996b2
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4
Identification of the Catalytically Dominant Iron Environment in Iron- and Nitrogen-Doped Carbon Catalysts for the Oxygen Reduction Reaction
Autor: Lingmei Ni, Charlotte Gallenkamp, Stephan Wagner, Eckhard Bill, Vera Krewald, Ulrike I. Kramm
Publikováno v: Journal of the American Chemical Society. 144:16827-16840
For a large scale utilization of fuel cells in a future hydrogen-based energy economy, affordable and environmentally benign catalysts are needed. Pyrolytically obtained metal and nitrogen doped carbon (MNC) catalysts are key contenders for this task
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4e73e8a8b8d16b83a5899a9cd714a617
https://doi.org/10.1021/jacs.2c04865
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7
Impact of Ir modification on the durability of FeNC catalysts under start-up and shutdown cycle conditions
Autor: Lingmei Ni, Simon-Johannes Kinkelin, Klaus Eberhardt, Stephen Paul, Robert W. Stark, Christopher Geppert, Ulrike I. Kramm, Nils Heppe, Carolin Prössl, Wolfram Jaegermann, Michael Bron, Markus Kübler
Publikováno v: Journal of Materials Chemistry A. 10:6038-6053
A common problem associated with FeNC catalysts is their poor stability dominated by the carbon oxidation reaction (COR). In this work, the feasibility of stabilizing FeNC catalysts with small quantities of Ir was explored. With iridium being present
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2b6d88d28475daf98791dc40a21fe27b
https://doi.org/10.1039/d1ta04668c
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8
Facilitating the acidic oxygen reduction of Fe–N–C catalysts by fluorine-doping
Autor: Ulrike I. Kramm, Zijie Qiu, Vladislav Gridin, Ruihu Lu, Yan Zhao, Xiafang Tao, Lingmei Ni, Klaus Müllen, Yazhou Zhou, Samir H Al-Hilfi
Publikováno v: Materials Horizons
As the alternatives to expensive Pt-based materials for the oxygen reduction reaction (ORR), iron/nitrogen co-doped carbon catalysts (FeNC) with dense FeNx active sites are promising candidates to promote the commercialization of proton exchange memb
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a05a98cac18e98fbb9e2bb49f9e1be11
https://doi.org/10.1039/d1mh01307f
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