Volkert, Cynthia Ann

[["dc.bibliographiccitation.firstpage","22"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Metals"],["dc.bibliographiccitation.volume","10"],["dc.contributor.author","Tian, Lin"],["dc.contributor.author","Tönnies, Dominik"],["dc.contributor.author","Hirsbrunner, Moritz"],["dc.contributor.author","Sievert, Tim"],["dc.contributor.author","Shan, Zhiwei"],["dc.contributor.author","Volkert, Cynthia A."],["dc.date.accessioned","2020-12-10T18:47:15Z"],["dc.date.available","2020-12-10T18:47:15Z"],["dc.date.issued","2020"],["dc.description.sponsorship","Open-Access-Publikationsfonds 2019"],["dc.identifier.doi","10.3390/met10010022"],["dc.identifier.eissn","2075-4701"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/17092"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/78696"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.notes.intern","Merged from goescholar"],["dc.publisher","MDPI"],["dc.relation.eissn","2075-4701"],["dc.relation.orgunit","Fakultät für Physik"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0/"],["dc.title","Effect of Hydrogen Charging on Pop-in Behavior of a Zr-Based Metallic Glass"],["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","2218"],["dc.bibliographiccitation.issue","9"],["dc.bibliographiccitation.journal","Sustainable Energy & Fuels"],["dc.bibliographiccitation.lastpage","2226"],["dc.bibliographiccitation.volume","3"],["dc.contributor.author","Baumung, Max"],["dc.contributor.author","Schönewald, Florian"],["dc.contributor.author","Erichsen, Torben"],["dc.contributor.author","Volkert, Cynthia A."],["dc.contributor.author","Risch, Marcel"],["dc.date.accessioned","2021-10-15T08:51:41Z"],["dc.date.available","2021-10-15T08:51:41Z"],["dc.date.issued","2019"],["dc.description.abstract","We investigate LiMn2O4 as a model catalyst for the oxygen evolution reaction (OER), because it shares the cubane structure with the active site of photosystem II. Specifically, we study the influence of different particle sizes of LiMn2O4 on the OER in a sodium hydroxide electrolyte. The product currents of manganese corrosion and oxygen evolution were obtained by rotating ring disk electrodes (RRDE). Physical characterization by various methods supports identical surface chemistry and microstructure of the pristine powders. We obtained similar oxygen current densities of 40(14) μA cmECSA−2 and 26(5) μA cmECSA−2 for micro- and nano-sized particles at 1.68 V vs. RHE. However, the total current densities differed drastically and while the micro-powder had a high disk current density of 205(2) μA cmECSA−2, its faradaic efficiency was only 25%. In contrast, the faradaic efficiency of the nanopowder was at least 75%. We hypothesize that a Mn redox process may occur in the bulk in parallel and possibly in combination with oxygen evolution on the surface based on the observed difference between the total and product current densities. Knowledge of the product currents is crucial for distinguishing the mechanisms of corrosion and catalysis and for designing better catalysts with high faradaic efficiency."],["dc.identifier.doi","10.1039/C8SE00551F"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/16500"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/90942"],["dc.identifier.url","https://publications.goettingen-research-online.de/handle/2/62345"],["dc.language.iso","en"],["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.issn","2398-4902"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.rights","CC BY 3.0"],["dc.title","Influence of particle size on the apparent electrocatalytic activity of LiMn2O4 for oxygen evolution"],["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","2003524"],["dc.bibliographiccitation.journal","Advanced Science"],["dc.contributor.author","Weber, Niklas A."],["dc.contributor.author","Schmidt, Hendrik"],["dc.contributor.author","Sievert, Tim"],["dc.contributor.author","Jooss, Christian"],["dc.contributor.author","Güthoff, Friedrich"],["dc.contributor.author","Moshneaga, Vasily"],["dc.contributor.author","Samwer, Konrad"],["dc.contributor.author","Krüger, Matthias"],["dc.contributor.author","Volkert, Cynthia A."],["dc.date.accessioned","2021-04-14T08:29:31Z"],["dc.date.available","2021-04-14T08:29:31Z"],["dc.date.issued","2021"],["dc.description.abstract","Despite the huge importance of friction in regulating movement in all natural and technological processes, the mechanisms underlying dissipation at a sliding contact are still a matter of debate. Attempts to explain the dependence of measured frictional losses at nanoscale contacts on the electronic degrees of freedom of the surrounding materials have so far been controversial. Here, it is proposed that friction can be explained by considering the damping of stick-slip pulses in a sliding contact. Based on friction force microscopy studies of La(1−x)SrxMnO3 films at the ferromagnetic-metallic to a paramagnetic-polaronic conductor phase transition, it is confirmed that the sliding contact generates thermally-activated slip pulses in the nanoscale contact, and argued that these are damped by direct coupling into the phonon bath. Electron-phonon coupling leads to the formation of Jahn–Teller polarons and to a clear increase in friction in the high-temperature phase. There is neither evidence for direct electronic drag on the atomic force microscope tip nor any indication of contributions from electrostatic forces. This intuitive scenario, that friction is governed by the damping of surface vibrational excitations, provides a basis for reconciling controversies in literature studies as well as suggesting possible tactics for controlling friction."],["dc.identifier.doi","10.1002/advs.202003524"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/82923"],["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 A | A01 Reibung unter aktiver Kontrolle in Systemen mit optimierten Freiheitsgraden"],["dc.relation","SFB 1073 | Topical Area C | C02 In situ hochauflösende Untersuchung des aktiven Zustands bei der photo- und elektrochemischen Wasserspaltung"],["dc.relation","SFB 1073 | Topical Area A: Control of dissipation"],["dc.relation.eissn","2198-3844"],["dc.relation.issn","2198-3844"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.rights","CC BY 4.0"],["dc.title","Polaronic Contributions to Friction in a Manganite Thin Film"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","1085"],["dc.bibliographiccitation.issue","12"],["dc.bibliographiccitation.journal","Metals"],["dc.bibliographiccitation.volume","8"],["dc.contributor.author","Tian, Lin"],["dc.contributor.author","Volkert, Cynthia A."],["dc.date.accessioned","2019-07-09T11:49:44Z"],["dc.date.available","2019-07-09T11:49:44Z"],["dc.date.issued","2018"],["dc.description.abstract","Local heterogeneities in the structure and properties of metallic glasses have recently been predicted by computer simulations and also observed in experiments. These heterogeneities are important in understanding the stability and performance of metallic glasses. Progress has been made in measuring heterogeneities in elastic properties and local density down to length scales of less than 10 nm. In this review, we focus on studies of structural and mechanical heterogeneities with emphasis on those achieved by transmission electron microscopy which has an excellent spatial resolution, multifunctional detection modes, as well as in-situ testing capabilities. We argue that the next important step in understanding the behavior of metallic glasses lies in understanding the spatial and temporal correlations between the various structural and mechanical heterogeneities"],["dc.description.sponsorship","Open-Access-Publikationsfonds 2018"],["dc.identifier.doi","10.3390/met8121085"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/15754"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/59617"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.publisher","MDPI"],["dc.relation.eissn","2075-4701"],["dc.relation.orgunit","Fakultät für Physik"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.rights","CC BY 4.0"],["dc.rights.uri","http://creativecommons.org/licenses/by/4.0/"],["dc.subject.ddc","530"],["dc.title","Measuring Structural Heterogeneities in Metallic Glasses Using Transmission Electron Microscopy"],["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","439"],["dc.bibliographiccitation.issue","12"],["dc.bibliographiccitation.journal","Materials Research Letters"],["dc.bibliographiccitation.lastpage","445"],["dc.bibliographiccitation.volume","8"],["dc.contributor.author","Tian, Lin"],["dc.contributor.author","Yang, Yue-Qing"],["dc.contributor.author","Meyer, Tobias"],["dc.contributor.author","Tönnies, Dominik"],["dc.contributor.author","Roddatis, Vladimir"],["dc.contributor.author","Voigt, Hendrik"],["dc.contributor.author","Zhao, Xin-Ai"],["dc.contributor.author","Wang, Zhang-Jie"],["dc.contributor.author","Xie, De-Gang"],["dc.contributor.author","Seibt, Michael"],["dc.contributor.author","Volkert, Cynthia A."],["dc.contributor.author","Shan, Zhi-Wei"],["dc.date.accessioned","2021-04-14T08:25:14Z"],["dc.date.available","2021-04-14T08:25:14Z"],["dc.date.issued","2020"],["dc.description.sponsorship","Open-Access-Publikationsfonds 2020"],["dc.identifier.doi","10.1080/21663831.2020.1791273"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/17506"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/81565"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.notes.intern","Merged from goescholar"],["dc.relation.eissn","2166-3831"],["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","Environmental transmission electron microscopy study of hydrogen charging effect on a Cu-Zr metallic glass"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]