Köhler, Lennart

[["dc.bibliographiccitation.firstpage","364"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Batteries & Supercaps"],["dc.bibliographiccitation.lastpage","372"],["dc.bibliographiccitation.volume","2"],["dc.contributor.author","Köhler, Lennart"],["dc.contributor.author","Szabadics, Lukas"],["dc.contributor.author","Jooss, Christian"],["dc.contributor.author","Risch, Marcel"],["dc.date.accessioned","2019-07-25T12:54:51Z"],["dc.date.available","2019-07-25T12:54:51Z"],["dc.date.issued","2019"],["dc.description.abstract","Active and stable bifunctional electrocatalysts are required for large‐scale deployment of rechargeable metal‐air and metal‐O2 batteries. This is hindered by the large overpotentials of the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) in alkaline media, where peroxide is an undesired side product. We study the suitability of epitaxial (001)‐oriented La0.6Sr0.4MnO3 perovskite surfaces as a bifunctional catalyst using a rotating‐ring disk electrode (RRDE) assembly and focus particularly on the selectivity of the ORR. The peroxide yield is above 50 % during ORR‐only investigations in the scan range of 0.69 to 0.99 V vs. RHE where the CV traces are reproducible. In contrast, the peroxide yield is drastically reduced during OER‐ORR cycling where a peroxide yield below 10 % is reached during the ORR in the scan range of 0.74 V to 1.74 V vs. RHE. Our study highlights the importance of the electrode history and thus clearly demonstrates that separate studies of the OER and ORR are insufficient to optimize bifunctional electrocatalysts."],["dc.identifier.doi","10.1002/batt.201800119"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/62054"],["dc.language.iso","en"],["dc.relation.issn","2566-6223"],["dc.relation.issn","2566-6223"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Peroxide Yield of the (001) La0.6Sr0.4MnO3 Surface as a Bifunctional Electrocatalyst for the Oxygen Reduction Reaction and Oxygen Evolution Reaction in Alkaline Media"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","4479"],["dc.bibliographiccitation.issue","22"],["dc.bibliographiccitation.journal","ChemSusChem"],["dc.bibliographiccitation.lastpage","4490"],["dc.bibliographiccitation.volume","10"],["dc.contributor.author","Köhler, Lennart"],["dc.contributor.author","Abrishami, Majid Ebrahimizadeh"],["dc.contributor.author","Roddatis, Vladimir"],["dc.contributor.author","Geppert, Janis"],["dc.contributor.author","Risch, Marcel"],["dc.date.accessioned","2018-10-17T06:32:18Z"],["dc.date.available","2018-10-17T06:32:18Z"],["dc.date.issued","2017"],["dc.description.abstract","Targeted improvement of the low efficiency of water oxidation during the oxygen evolution reaction (OER) is severely hindered by insufficient knowledge of the electrocatalytic mechanism on heterogeneous surfaces. We chose LiMn2 O4 as a model system for mechanistic investigations as it shares the cubane structure with the active site of photosystem II and the valence of Mn3.5+ with the dark-stable S1 state in the mechanism of natural photosynthesis. The investigated LiMn2 O4 nanoparticles are electrochemically stable in NaOH electrolytes and show respectable activity in any of the main metrics. At low overpotential, the key mechanistic parameters of Tafel slope, Nernst slope, and reaction order have constant values on the RHE scale of 62(1) mV dec-1 , 1(1) mV pH-1 , -0.04(2), respectively. These values are interpreted in the context of the well-studied mechanism of natural photosynthesis. The uncovered difference in the reaction sequence is important for the design of efficient bio-inspired electrocatalysts."],["dc.identifier.doi","10.1002/cssc.201701582"],["dc.identifier.pmid","28921902"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/14992"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/16065"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","final"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area C | C05 Kontrolle Elektronen-getriebener Chemie durch Interkalation"],["dc.relation","SFB 1073 | Topical Area Z | Z02 Hochauflösende Charakterisierung von Grenzflächen"],["dc.relation.eissn","1864-564X"],["dc.relation.orgunit","Fakultät für Physik"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.rights","CC BY-NC 4.0"],["dc.rights.uri","http://creativecommons.org/licenses/by-nc/4.0"],["dc.title","Mechanistic Parameters of Electrocatalytic Water Oxidation on LiMn2 O4 in Comparison to Natural Photosynthesis"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","23"],["dc.bibliographiccitation.journal","Physical Review B"],["dc.bibliographiccitation.volume","102"],["dc.contributor.author","Köhler, T."],["dc.contributor.author","Paeckel, S."],["dc.contributor.author","Meyer, C."],["dc.contributor.author","Manmana, Salvatore R."],["dc.date.accessioned","2021-04-14T08:24:39Z"],["dc.date.available","2021-04-14T08:24:39Z"],["dc.date.issued","2020"],["dc.description.abstract","We describe the formation of charge- and spin-density patterns induced by spin-selective photoexcitations of interacting fermionic systems in the presence of a microstructure. As an example, we consider a one-dimensional Hubbard-like system with a periodic magnetic microstructure, which has a uniform charge distribution in its ground state, and in which a long-lived charge-density pattern is induced by the spin-selective photoexcitation. Using tensor-network methods, we study the full quantum dynamics in the presence of electron-electron interactions and identify doublons as the main decay channel for the induced charge pattern. Our setup is compared to the optically induced spin transfer (OISTR) mechanism, in which ultrafast optically induced spin transfer in Heusler and magnetic compounds is associated to the difference of the local density of states of the different elements in the alloys. We find that applying a spin-selective excitation there induces spatially periodic patterns in local observables. Implications for pump-probe experiments on correlated materials and experiments with ultracold gases on optical lattices are discussed."],["dc.identifier.doi","10.1103/PhysRevB.102.235166"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/81374"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area B | B03 Relaxation, Thermalisierung, Transport und Kondensation in hochangeregten Festkörpern"],["dc.relation.eissn","2469-9969"],["dc.relation.issn","2469-9950"],["dc.rights","CC BY 4.0"],["dc.title","Formation of spatial patterns by spin-selective excitations of interacting fermions"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","4224"],["dc.bibliographiccitation.issue","22"],["dc.bibliographiccitation.journal","ChemSusChem"],["dc.bibliographiccitation.lastpage","4224"],["dc.bibliographiccitation.volume","10"],["dc.contributor.author","Köhler, Lennart"],["dc.contributor.author","Ebrahimizadeh Abrishami, Majid"],["dc.contributor.author","Roddatis, Vladimir"],["dc.contributor.author","Geppert, Janis"],["dc.contributor.author","Risch, Marcel"],["dc.date.accessioned","2021-12-08T12:30:28Z"],["dc.date.available","2021-12-08T12:30:28Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1002/cssc.201701810"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/96447"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-476"],["dc.relation.issn","1864-5631"],["dc.rights.uri","http://doi.wiley.com/10.1002/tdm_license_1.1"],["dc.title","Cover Feature: Mechanistic Parameters of Electrocatalytic Water Oxidation on LiMn 2 O 4 in Comparison to Natural Photosynthesis (ChemSusChem 22/2017)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1800668"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","physica status solidi (b)"],["dc.bibliographiccitation.volume","256"],["dc.contributor.author","Ziegler, Fabian"],["dc.contributor.author","Köhler, Lennart"],["dc.contributor.author","Gibhardt, Holger"],["dc.contributor.author","Gesing, Thorsten M."],["dc.contributor.author","Murshed, Mangir M."],["dc.contributor.author","Sobolev, Oleg"],["dc.contributor.author","Piovano, Andrea"],["dc.contributor.author","Eckold, Götz"],["dc.date.accessioned","2020-12-10T14:07:06Z"],["dc.date.available","2020-12-10T14:07:06Z"],["dc.date.issued","2019"],["dc.identifier.doi","10.1002/pssb.v256.7"],["dc.identifier.eissn","1521-3951"],["dc.identifier.issn","0370-1972"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/70126"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Characterization of Multiferroic Bi 2 Mn 4 O 10 by Dielectric and Neutron Spectroscopy"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]