George Polymeros
Max Planck Society
11 Papers
George Polymeros is an academic researcher from Max Planck Society. The author has contributed to research in topics: Proton exchange membrane fuel cell & Nanoparticle. The author has an hindex of 11, co-authored 11 publications.
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Papers
A Critical Review on Hydrogen Evolution Electrocatalysis: Re-exploring the Volcano-relationship
Aleksandar R. Zeradjanin,Aleksandar R. Zeradjanin,Jan-Philipp Grote,George Polymeros,Karl Johann Jakob Mayrhofer,Karl Johann Jakob Mayrhofer,Karl Johann Jakob Mayrhofer +6 more
TL;DR: In this article, the authors provide an overview on the topic for the model hydrogen evolution reaction (HER), pointing out certain inconsistencies and contradictions found in literature, and provide a viewpoint which could have important practical consequences and could provide different perspective on future catalyst design.
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Positive Effect of Surface Doping with Au on the Stability of Pt-Based Electrocatalysts
Matija Gatalo,Primož Jovanovič,George Polymeros,Jan-Philipp Grote,Andraž Pavlišič,Francisco Ruiz-Zepeda,Vid Simon Šelih,Martin Šala,Samo B. Hočevar,Marjan Bele,Karl Johann Jakob Mayrhofer,Karl Johann Jakob Mayrhofer,Nejc Hodnik,Miran Gaberšček +13 more
TL;DR: In this article, a transition-metal-rich PtCu3/C oxygen reduction reaction (ORR) catalyst was improved by doping with small amounts of gold (<1 at. %).
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Balanced work function as a driver for facile hydrogen evolution reaction - comprehension and experimental assessment of interfacial catalytic descriptor.
Aleksandar R. Zeradjanin,Aleksandar R. Zeradjanin,Ashokanand Vimalanandan,George Polymeros,Angel Angelov Topalov,Karl Johann Jakob Mayrhofer,Karl Johann Jakob Mayrhofer,Karl Johann Jakob Mayrhofer,Michael Rohwerder +8 more
TL;DR: An interfacial descriptor of the electrocatalytic activity for hydrogen evolution reaction, analogue to the adsorption energy of the Had intermediate, is identified experimentally using in situ probing of the surface potentials of the metals, under conditions of continuous control of the humidity and the gas exposure.
Platinum recycling going green via induced surface potential alteration enabling fast and efficient dissolution.
Nejc Hodnik,Claudio Baldizzone,Claudio Baldizzone,George Polymeros,Simon Geiger,Jan-Philipp Grote,Serhiy Cherevko,Serhiy Cherevko,Andrea Maria Mingers,Aleksandar R. Zeradjanin,Aleksandar R. Zeradjanin,Karl Johann Jakob Mayrhofer,Karl Johann Jakob Mayrhofer,Karl Johann Jakob Mayrhofer +13 more
TL;DR: It is demonstrated that complete dissolution of metallic platinum can be achieved by induced surface potential alteration, an ‘electrode-less' process utilizing alternatively oxidative and reductive gases.
Structure–Activity–Stability Relationships for Space-Confined PtxNiy Nanoparticles in the Oxygen Reduction Reaction
Stefano Mezzavilla,Claudio Baldizzone,Ann-Christin Swertz,Nejc Hodnik,Enrico Pizzutilo,George Polymeros,Gareth P. Keeley,Johannes Knossalla,Marc Heggen,Karl Johann Jakob Mayrhofer,Karl Johann Jakob Mayrhofer,Karl Johann Jakob Mayrhofer,Ferdi Schüth +12 more
TL;DR: In this article, the authors studied the performance of Pt-Ni nanoparticles embedded in hollow graphitic spheres (HGS) for the oxygen reduction reaction (ORR) and found that the presence of platinum during the reduction step, as well as the application of high annealing temperatures (at least 850 °C for 3.5h in Ar), are necessary conditions to achieve the complete encapsulation and the full stability of the catalysts.
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