Risch, Marcel

[["dc.bibliographiccitation.artnumber","034009"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Journal of Physics: Energy"],["dc.bibliographiccitation.volume","2"],["dc.contributor.affiliation","Villalobos, Javier;"],["dc.contributor.affiliation","Golnak, Ronny;"],["dc.contributor.affiliation","Xi, Lifei;"],["dc.contributor.affiliation","Schuck, Götz;"],["dc.contributor.affiliation","Risch, Marcel;"],["dc.contributor.author","Villalobos, Javier"],["dc.contributor.author","Golnak, Ronny"],["dc.contributor.author","Xi, Lifei"],["dc.contributor.author","Schuck, Götz"],["dc.contributor.author","Risch, Marcel"],["dc.date.accessioned","2021-04-14T08:24:16Z"],["dc.date.available","2021-04-14T08:24:16Z"],["dc.date.issued","2020"],["dc.date.updated","2022-02-09T13:18:45Z"],["dc.description.abstract","AbstractManganese oxides have received much attention over the years among the wide range of electrocatalysts for the oxygen evolution reaction (OER) due to their low toxicity, high abundance and rich redox chemistry. While many previous studies focused on the activity of these materials, a better understanding of the material transformations relating to activation or degradation is highly desirable, both from a scientific perspective and for applications. We electrodeposited Na-containing MnOx without long-range order from an alkaline solution to investigate these aspects by cyclic voltammetry, scanning electron microscopy and x-ray absorption spectroscopy at the Mn-K and Mn-L edges. The pristine film was assigned to a layered edge-sharing Mn3+/4+ oxide with Mn-O bond lengths of mainly 1.87 Å and some at 2.30 Å as well as Mn-Mn bond lengths of 2.87 Å based on fits to the extended x-ray fine structure. The decrease of the currents at voltages before the onset of the OER followed power laws with three different exponents depending on the number of cycles and the Tafel slope decreases from 186 ± 48 to 114 ± 18 mV dec−1 after 100 cycles, which we interpret in the context of surface coverage with unreacted intermediates. Post-mortem microscopy and bulk spectroscopy at the Mn-K edge showed no change of the microstructure, bulk local structure or bulk Mn valence. Yet, the surface region of MnOx oxidized toward Mn4+, which explains the reduction of the currents in agreement with literature. Surprisingly, we find that MnOx reactivates after 30 min at open-circuit (OC), where the currents and also the Tafel slope increase. Reactivation processes during OC are crucial because OC is unavoidable when coupling the electrocatalysts to intermittent power sources such as solar energy for sustainable energy production."],["dc.description.sponsorship","H2020 European Research Councilhttp://dx.doi.org/10.13039/100010663"],["dc.identifier.doi","10.1088/2515-7655/ab9fe2"],["dc.identifier.eissn","2515-7655"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/81226"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.publisher","IOP Publishing"],["dc.relation.eissn","2515-7655"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.rights.uri","http://creativecommons.org/licenses/by/4.0"],["dc.title","Reversible and irreversible processes during cyclic voltammetry of an electrodeposited manganese oxide as catalyst for the oxygen evolution reaction"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","17682"],["dc.bibliographiccitation.issue","33"],["dc.bibliographiccitation.journal","The Journal of Physical Chemistry C"],["dc.bibliographiccitation.lastpage","17692"],["dc.bibliographiccitation.volume","121"],["dc.contributor.author","Risch, Marcel"],["dc.contributor.author","Stoerzinger, Kelsey A."],["dc.contributor.author","Han, Binghong"],["dc.contributor.author","Regier, Tom Z."],["dc.contributor.author","Peak, Derek"],["dc.contributor.author","Sayed, Sayed Youssef"],["dc.contributor.author","Wei, Chao"],["dc.contributor.author","Xu, Zhichuan"],["dc.contributor.author","Shao-Horn, Yang"],["dc.date.accessioned","2020-12-10T15:22:44Z"],["dc.date.available","2020-12-10T15:22:44Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1021/acs.jpcc.7b05592"],["dc.identifier.eissn","1932-7455"],["dc.identifier.issn","1932-7447"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/73518"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Redox Processes of Manganese Oxide in Catalyzing Oxygen Evolution and Reduction: An in Situ Soft X-ray Absorption Spectroscopy Study"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","154"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Catalysts"],["dc.bibliographiccitation.volume","7"],["dc.contributor.author","Risch, Marcel"],["dc.date.accessioned","2018-10-17T06:48:28Z"],["dc.date.available","2018-10-17T06:48:28Z"],["dc.date.issued","2017"],["dc.description.abstract","Oxygen reduction is considered a key reaction for electrochemical energy conversion but slow kinetics hamper application in fuel cells and metal-air batteries. In this review, the prospect of perovskite oxides for the oxygen reduction reaction (ORR) in alkaline media is reviewed with respect to fundamental insight into activity and possible mechanisms. For gaining these insights, special emphasis is placed on highly crystalline perovskite films that have only recently become available for electrochemical interrogation. The prospects for applications are evaluated based on recent progress in the synthesis of perovskite nanoparticles. The review concludes with the current understanding of oxygen reduction on perovskite oxides and a perspective on opportunities for future fundamental and applied research."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft"],["dc.identifier.doi","10.3390/catal7050154"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/14630"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/16066"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","final"],["dc.publisher","MDPI"],["dc.relation.eissn","2073-4344"],["dc.relation.orgunit","Fakultät für Physik"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.rights","CC BY 4.0"],["dc.title","Perovskite Electrocatalysts for the Oxygen Reduction Reaction in Alkaline Media"],["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","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","1700109"],["dc.bibliographiccitation.issue","12"],["dc.bibliographiccitation.journal","Advanced sustainable systems"],["dc.bibliographiccitation.volume","1"],["dc.contributor.author","Mierwaldt, Daniel"],["dc.contributor.author","Roddatis, Vladimir"],["dc.contributor.author","Risch, Marcel"],["dc.contributor.author","Scholz, Julius"],["dc.contributor.author","Geppert, Janis"],["dc.contributor.author","Abrishami, Majid Ebrahimizadeh"],["dc.contributor.author","Jooss, Christian"],["dc.date.accessioned","2020-12-10T14:06:44Z"],["dc.date.available","2020-12-10T14:06:44Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1002/adsu.201700109"],["dc.identifier.issn","2366-7486"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/70006"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area C | C02 In situ hochauflösende Untersuchung des aktiven Zustands bei der photo- und elektrochemischen Wasserspaltung"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.rights","CC BY-NC 4.0"],["dc.title","Environmental TEM Investigation of Electrochemical Stability of Perovskite and Ruddlesden-Popper Type Manganite Oxygen Evolution Catalysts"],["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","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.firstpage","184"],["dc.bibliographiccitation.issue","S2"],["dc.bibliographiccitation.journal","Microscopy and Microanalysis"],["dc.bibliographiccitation.lastpage","185"],["dc.bibliographiccitation.volume","24"],["dc.contributor.author","Poring, F."],["dc.contributor.author","Marschall, F."],["dc.contributor.author","Yin, Z."],["dc.contributor.author","Rosner, B."],["dc.contributor.author","Beye, M."],["dc.contributor.author","Miedema, P."],["dc.contributor.author","Kubicek, K."],["dc.contributor.author","Glaser, L."],["dc.contributor.author","Raiser, D."],["dc.contributor.author","Soltau, J."],["dc.contributor.author","Guzenko, V. A."],["dc.contributor.author","Viefhaus, J."],["dc.contributor.author","Buck, J."],["dc.contributor.author","Risch, M."],["dc.contributor.author","Techert, S."],["dc.contributor.author","David, C."],["dc.date.accessioned","2019-07-25T12:59:46Z"],["dc.date.available","2019-07-25T12:59:46Z"],["dc.date.issued","2018"],["dc.identifier.doi","10.1017/S1431927618013260"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/62056"],["dc.language.iso","en"],["dc.relation.issn","1431-9276"],["dc.relation.issn","1435-8115"],["dc.relation.orgunit","Institut für Röntgenphysik"],["dc.relation.workinggroup","RG Techert (Structural Dynamics in Chemical Systems)"],["dc.title","ID-Full Field Microscopy of Elastic and Inelastic Scattering with Transmission off-axis Fresnel Zone Plates"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1266"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Journal of Synchrotron Radiation"],["dc.bibliographiccitation.lastpage","1271"],["dc.bibliographiccitation.volume","26"],["dc.contributor.author","Döring, Florian"],["dc.contributor.author","Risch, Marcel"],["dc.contributor.author","Rösner, Benedikt"],["dc.contributor.author","Beye, Martin"],["dc.contributor.author","Busse, Philipp"],["dc.contributor.author","Kubiček, Katharina"],["dc.contributor.author","Glaser, Leif"],["dc.contributor.author","Miedema, Piter S."],["dc.contributor.author","Soltau, Jakob"],["dc.contributor.author","Raiser, Dirk"],["dc.contributor.author","Guzenko, Vitaliy A."],["dc.contributor.author","Szabadics, Lukas"],["dc.contributor.author","Kochanneck, Leif"],["dc.contributor.author","Baumung, Max"],["dc.contributor.author","Buck, Jens"],["dc.contributor.author","Jooss, Christian"],["dc.contributor.author","Techert, Simone"],["dc.contributor.author","David, Christian"],["dc.date.accessioned","2020-12-10T18:25:59Z"],["dc.date.available","2020-12-10T18:25:59Z"],["dc.date.issued","2019"],["dc.description.abstract","X-ray absorption spectroscopy (XAS) is a powerful element-specific technique that allows the study of structural and chemical properties of matter. Often an indirect method is used to access the X-ray absorption (XA). This work demonstrates a new XAS implementation that is based on off-axis transmission Fresnel zone plates to obtain the XA spectrum of La0.6Sr0.4MnO3 by analysis of three emission lines simultaneously at the detector, namely the O 2p-1s, Mn 3s-2p and Mn 3d-2p transitions. This scheme allows the simultaneous measurement of an integrated total fluorescence yield and the partial fluorescence yields (PFY) of the Mn 3s-2p and Mn 3d-2p transitions when scanning the Mn L-edge. In addition to this, the reduction in O fluorescence provides another measure for absorption often referred to as the inverse partial fluorescence yield (IPFY). Among these different methods to measure XA, the Mn 3s PFY and IPFY deviate the least from the true XA spectra due to the negligible influence of selection rules on the decay channel. Other advantages of this new scheme are the potential to strongly increase the efficiency and throughput compared with similar measurements using conventional gratings and to increase the signal-to-noise of the XA spectra as compared with a photodiode. The ability to record undistorted bulk XA spectra at high flux is crucial for future in situ spectroscopy experiments on complex materials."],["dc.identifier.doi","10.1107/S1600577519003898"],["dc.identifier.issn","1600-5775"],["dc.identifier.pmid","31274453"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/16305"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/75901"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["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 C | C05 Kontrolle Elektronen-getriebener Chemie durch Interkalation"],["dc.relation.eissn","1600-5775"],["dc.relation.issn","1600-5775"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.relation.workinggroup","RG Techert (Structural Dynamics in Chemical Systems)"],["dc.title","A zone-plate-based two-color spectrometer for indirect X-ray absorption spectroscopy"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","F813"],["dc.bibliographiccitation.issue","10"],["dc.bibliographiccitation.journal","Journal of The Electrochemical Society"],["dc.bibliographiccitation.lastpage","F820"],["dc.bibliographiccitation.volume","165"],["dc.contributor.author","Han, Binghong"],["dc.contributor.author","Risch, Marcel"],["dc.contributor.author","Belden, Samuel"],["dc.contributor.author","Lee, Seonggyu"],["dc.contributor.author","Bayer, Domnik"],["dc.contributor.author","Mutoro, Eva"],["dc.contributor.author","Shao-Horn, Yang"],["dc.date.accessioned","2018-10-17T06:52:21Z"],["dc.date.available","2018-10-17T06:52:21Z"],["dc.date.issued","2018"],["dc.description.abstract","he lack of stable and economic supporting materials at high voltages hampers the development of electrocatalysts for oxygen evolution reaction (OER), which is the major source of energy loss in water splitting to produce hydrogen. In this work, we developed systematic methods to evaluate candidate compounds that can potentially replace traditional carbon support for OER catalysts. Stability, economic and conductivity criteria of the oxide support materials were studied and discussed. A nano-sized antimony-doped tin oxide was fabricated to support RuO2, which was shown to provide the highest stability and activity of OER in 0.5 M H2SO4 up to 2.5 VRHE and up to 55°C."],["dc.identifier.doi","10.1149/2.0921810jes"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/16067"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.title","Screening Oxide Support Materials for OER Catalysts in Acid"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["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"]]