Projects per year
Abstract
Studying electrochemically induced phenomena by means of highly sensitive SQUID-magnetometry (superconducting quantum interference device) is very attractive, both for a deeper understanding of charging processes by a magnetic tool and for controlling magnetism by electrochemical stimuli. Both issues will be addressed in this talk.
The magnetic moment serves as highly sensitive fingerprint for the oxidation state of the transition metal ions in battery cathode materials thus enabling to identify the electrochemical ”active” ions. An overview will be given on operando magnetometry studies of the important class of LiNiCoMn-oxide cathode materials (so-called NMC with Ni:Co:Mn ratios of 1:1:1 and 3:1:1 [1, 2]) as well as of sodium vanadium phosphate cathodes [3]. In addition, first operando positron annihilation studies on a battery cathode material (NMC 1:1:1) will be presented yielding insight into lattice defects induced by charging and discharging [4].
Regarding electrochemically induced variations of magnetism, nanoporous materials are particularly promising owing to their high surface-to-volume ratio. Measurements on nanoporous Pd(Co) obtained by dealloying will be presented which demonstrate reversible switching of magnetism by electrochemical hydrogen sorption [5].
Acknowledgement: Financial support by the Austrian Science Fund (FWF): P30070-N36 is appreciated. This work was performed in the framework of the interuniversity cooperation of TU Graz and Uni Graz on natural sciences (NAWI Graz).
References:
[1] G. Klinser, S. Topolovec, H. Kren, S. Koller, W. Gössler, H. Krenn, R. Würschum, Appl. Phys. Letters 109 (2016) 213901, DOI: 10.1063/1.4968547
[2] G. Klinser, M. Stückler, H. Kren, S. Koller, W. Goessler, H.Krenn, R. Würschum, J. Power Sources 396 (2018) 791, DOI 10.1016/j.jpowsour.2018.06.090
[3] G. Klinser, R. Zettl, M. Wilkening, H. Krenn, I. Hanzu, R. Würschum, Phys. Chem. Chem. Phys. 21 (2019) 20151, DOI: 10.1039/C9CP04045E
[4] G. Klinser, H. Kren, S. Koller, R. Würschum, Appl. Phys. Letters 114 (2019) 013905-1, DOI: 10.1063/1.5081668
[5] M. Gössler, M. Albu, G. Klinser, E.-M. Steyskal, R. Würschum, Small (2019) 1904523, DOI: 10.1002/smll.201904523
The magnetic moment serves as highly sensitive fingerprint for the oxidation state of the transition metal ions in battery cathode materials thus enabling to identify the electrochemical ”active” ions. An overview will be given on operando magnetometry studies of the important class of LiNiCoMn-oxide cathode materials (so-called NMC with Ni:Co:Mn ratios of 1:1:1 and 3:1:1 [1, 2]) as well as of sodium vanadium phosphate cathodes [3]. In addition, first operando positron annihilation studies on a battery cathode material (NMC 1:1:1) will be presented yielding insight into lattice defects induced by charging and discharging [4].
Regarding electrochemically induced variations of magnetism, nanoporous materials are particularly promising owing to their high surface-to-volume ratio. Measurements on nanoporous Pd(Co) obtained by dealloying will be presented which demonstrate reversible switching of magnetism by electrochemical hydrogen sorption [5].
Acknowledgement: Financial support by the Austrian Science Fund (FWF): P30070-N36 is appreciated. This work was performed in the framework of the interuniversity cooperation of TU Graz and Uni Graz on natural sciences (NAWI Graz).
References:
[1] G. Klinser, S. Topolovec, H. Kren, S. Koller, W. Gössler, H. Krenn, R. Würschum, Appl. Phys. Letters 109 (2016) 213901, DOI: 10.1063/1.4968547
[2] G. Klinser, M. Stückler, H. Kren, S. Koller, W. Goessler, H.Krenn, R. Würschum, J. Power Sources 396 (2018) 791, DOI 10.1016/j.jpowsour.2018.06.090
[3] G. Klinser, R. Zettl, M. Wilkening, H. Krenn, I. Hanzu, R. Würschum, Phys. Chem. Chem. Phys. 21 (2019) 20151, DOI: 10.1039/C9CP04045E
[4] G. Klinser, H. Kren, S. Koller, R. Würschum, Appl. Phys. Letters 114 (2019) 013905-1, DOI: 10.1063/1.5081668
[5] M. Gössler, M. Albu, G. Klinser, E.-M. Steyskal, R. Würschum, Small (2019) 1904523, DOI: 10.1002/smll.201904523
| Original language | English |
|---|---|
| Publication status | Published - 2020 |
| Event | Energy Efficient Magnetoelectric Materials by Ionic Approaches: Fundamentals, Challenges and Perspectives: 712. WE-Heraeus-Seminar - Physikzentrum, Bad Honnef, Germany Duration: 26 Jan 2020 → 29 Jan 2020 https://www.we-heraeus-stiftung.de/veranstaltungen/seminare/2020/energy-efficient-magnetoelectric-materials-by-ionic-approaches-fundamentals-challenges-and-perspectives/venue/ |
Seminar
| Seminar | Energy Efficient Magnetoelectric Materials by Ionic Approaches: Fundamentals, Challenges and Perspectives |
|---|---|
| Country/Territory | Germany |
| City | Bad Honnef |
| Period | 26/01/20 → 29/01/20 |
| Internet address |
Fields of Expertise
- Advanced Materials Science
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Energy Materials & Nanomaterials
Brossmann, U., Steyskal, E., Würschum, R. & Klinser, G.
1/01/00 → …
Project: Research area
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FWF - Nanoporös - In-situ magnetometry of nanoporous metals during dealloying and charging
Würschum, R., Steyskal, E. & Gößler, M.
17/07/17 → 16/10/21
Project: Research project
Activities
- 1 Invited talk at conference or symposium
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Invited talk entitled: In-situ SQUID studies of electrochemically induced phenomena: Operando diagnosis of battery cathode charging and switching the magnetism of nanoporous alloys
Roland Würschum (Speaker)
26 Jan 2020 → 29 Jan 2020Activity: Talk or presentation › Invited talk at conference or symposium › Science to science