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Ifan E. L. Stephens
Researcher at Imperial College London
Publications - 151
Citations - 17409
Ifan E. L. Stephens is an academic researcher from Imperial College London. The author has contributed to research in topics: Catalysis & Chemistry. The author has an hindex of 43, co-authored 108 publications receiving 11810 citations. Previous affiliations of Ifan E. L. Stephens include Massachusetts Institute of Technology & Technical University of Denmark.
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Journal ArticleDOI
Alloys of platinum and early transition metals as oxygen reduction electrocatalysts
Jeffrey Greeley,Ifan E. L. Stephens,Alexander S. Bondarenko,Tobias Peter Johansson,Heine Anton Hansen,Thomas F. Jaramillo,Thomas F. Jaramillo,Jan Rossmeisl,Ib Chorkendorff,Jens K. Nørskov +9 more
TL;DR: A new set of ORR electrocatalysts consisting of Pd or Pt alloyed with early transition metals such as Sc or Y, identified using density functional theory calculations as being the most stable Pt- and Pd-based binary alloys with ORR activity likely to be better than Pt.
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Progress and Perspectives of Electrochemical CO2 Reduction on Copper in Aqueous Electrolyte
Stephanie A. Nitopi,Erlend Bertheussen,Søren Bertelsen Scott,Xinyan Liu,Albert K. Engstfeld,Albert K. Engstfeld,Sebastian Horch,Brian Seger,Ifan E. L. Stephens,Ifan E. L. Stephens,Karen Chan,Karen Chan,Christopher Hahn,Christopher Hahn,Jens K. Nørskov,Jens K. Nørskov,Jens K. Nørskov,Thomas F. Jaramillo,Thomas F. Jaramillo,Ib Chorkendorff +19 more
TL;DR: A broad and historical view of different aspects and their complex interplay in CO2R catalysis on Cu is taken, with the purpose of providing new insights, critical evaluations, and guidance to the field with regard to research directions and best practices.
Journal ArticleDOI
Understanding the electrocatalysis of oxygen reduction on platinum and its alloys
Ifan E. L. Stephens,Alexander S. Bondarenko,Alexander S. Bondarenko,Ulrik Grønbjerg,Jan Rossmeisl,Ib Chorkendorff +5 more
TL;DR: In this paper, the authors provide an overview of the fundamentals underlying the reduction of oxygen on platinum and its alloys, and report the ORR activity of Pt5La for the first time, which shows a 3.5-to 4.5fold improvement in activity over Pt in the range 0.9 to 0.87 V.
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Enabling direct H2O2 production through rational electrocatalyst design
Samira Siahrostami,Arnau Verdaguer-Casadevall,Mohammadreza Karamad,Davide Deiana,Paolo Malacrida,Björn Wickman,Björn Wickman,María Escudero-Escribano,Elisa Antares Paoli,Rasmus Frydendal,Thomas Willum Hansen,Ib Chorkendorff,Ifan E. L. Stephens,Jan Rossmeisl +13 more
TL;DR: Electrochemical measurements on Pt-Hg nanoparticles show more than an order of magnitude improvement in mass activity, that is, A g(-1) precious metal, for H2O2 production, over the best performing catalysts in the literature.
Journal ArticleDOI
A rigorous electrochemical ammonia synthesis protocol with quantitative isotope measurements
Suzanne Zamany Andersen,Viktor Colic,Sungeun Yang,Sungeun Yang,Jay A. Schwalbe,Adam C. Nielander,Joshua M. McEnaney,Kasper Enemark-Rasmussen,Jon G. Baker,Aayush R. Singh,Brian A. Rohr,Michael J. Statt,Sarah J. Blair,Stefano Mezzavilla,Jakob Kibsgaard,Peter Christian Kjærgaard Vesborg,Matteo Cargnello,Stacey F. Bent,Thomas F. Jaramillo,Ifan E. L. Stephens,Jens K. Nørskov,Ib Chorkendorff +21 more
TL;DR: A protocol for the electrochemical reduction of nitrogen to ammonia enables isotope-sensitive quantification of the ammonia produced and the identification and removal of contaminants, and should help to prevent false positives from appearing in the literature.