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Zhang, Chenglin; Xu, Yang; He, Kaiming; Dong, Yulian; Zhao, Huaping; Medenbach, Lukas; Wu, Yuhan; Balducci, Andrea; Hannappel, Thomas; Lei, Yong;
Polyimide@Ketjenblack composite: a porous organic cathode for fast rechargeable potassium-ion batteries. - In: Small : nano micro.. - Weinheim : Wiley-VCH, ISSN 1613-6829, Volume 16 (2020), issue 38, 2002953, Seite 1-8

Potassium-ion batteries (PIBs) configurated by organic electrodes have been identified as a promising alternative to lithium-ion batteries. Here, a porous organic PolyimideKetjenblack is demonstrated in PIBs as a cathode, which exhibits excellent performance with a large reversible capacity (143 mAh g^-1 at 100 mA g^-1), high rate capability (125 and 105 mAh g^-1 at 1000 and 5000 mA g^-1), and long cycling stability (76% capacity retention at 2000 mA g^-1 over 1000 cycles). The domination of fast capacitive-like reaction kinetics is verified, which benefits from the porous structure synthesized using in situ polymerization. Moreover, a renewable and low-cost full cell is demonstrated with superior rate behavior (106 mAh g^-1 at 3200 mA g^-1). This work proposes a strategy to design polymer electrodes for high-performance organic PIBs.



https://doi.org/10.1002/smll.202002953
Xu, Rui; Du, Lei; Adekoya, David; Zhang, Gaixia; Zhang, Shanqing; Sun, Shuhui; Lei, Yong;
Well-defined nanostructures for electrochemical energy conversion and storage. - In: Advanced energy materials. - Weinheim : Wiley-VCH, ISSN 1614-6840, (2020), 2001537, insges. 53 S.
- First published: 16 June 2020

Electrochemical energy conversion and storage play crucial roles in meeting the increasing demand for renewable, portable, and affordable power supplies for society. The rapid development of nanostructured materials provides an alternative route by virtue of their unique and promising effects emerging at nanoscale. In addition to finding advanced materials, structure design and engineering of electrodes improves the electrochemical performance and the resultant commercial competitivity. Regarding the structural engineering, controlling the geometrical parameters (i.e., size, shape, hetero-architecture, and spatial arrangement) of nanostructures and thus forming well-defined nanostructure (WDN) electrodes have been the central aspects of investigations and practical applications. This review discusses the fundamental aspects and concept of WDNs for energy conversion and storage, with a strong emphasis on illuminating the relationship between the structural characteristics and the resultant electrochemical superiorities. Key strategies for actualizing well-defined features in nanostructures are summarized. Electrocatalysis and photoelectrocatalysis (for energy conversion) as well as metal-ion batteries and supercapacitors (for energy storage) are selected to illustrate the superiorities of WDNs in electrochemical reactions and charge carrier transportation. Finally, conclusions and perspectives regarding future research, development, and applications of WDNs are discussed.



https://doi.org/10.1002/aenm.202001537
Gruia, Violeta-Tincuta; Ispas, Adriana; Efimov, Igor; Bund, Andreas;
Cation exchange behavior during the redox switching of poly (3,4-ethylenedioxythiophene) films. - In: Journal of solid state electrochemistry : current research and development in science and technology.. - Berlin : Springer, ISSN 1433-0768, Bd. 24 (2020), 11/12, S. 3231-3244

Poly (3,4-ethylenedioxythiophene), PEDOT, films were synthesized at room temperature by potentiodynamic and potentiostatic step deposition in aqueous solutions containing EDOT monomer and LiClO4. In some solutions, the effect of small amounts of sodium dodecylsulfate, SDS, on the polymerization rate of EDOT and on the stiffness of the obtained PEDOT film was studied. The obtained PEDOT films were transferred in aqueous solutions containing cations with different molar mass, such as H+, Li+, Na+, K+, and Cs+. The apparent molar masses of the exchanged species during potentiodynamic experiments were determined by in situ microgravimetry. These measurements underlined the importance of the electrolyte chosen for electropolymerization process. It is known that SDS anions can be trapped inside the polymer layer during electropolymerization, providing them with a cation exchange behavior. However, even if the PEDOT films were deposited from an electrolyte without SDS, they still acted as cation exchangers.



https://doi.org/10.1007/s10008-020-04809-6
Semper, Sebastian; Döbereiner, Michael; Pawar, Sankalp; Landmann, Markus; Del Galdo, Giovanni;
eadf: representation of far-field antenna responses in Python. - In: SoftwareX. - Amsterdam [u.a.] : Elsevier, ISSN 2352-7110, Bd. 12 (2020), 100583, S. 1-6

https://doi.org/10.1016/j.softx.2020.100583
Song, Xinya; Cai, Hui; Jiang, Teng; Sennewald, Tom; Kircheis, Jan; Schlegel, Steffen; Noris, L.; Benzetta, Y.; Westermann, Dirk;
Research on performance of real-time simulation based on inverter-dominated power grid. - In: IEEE access. - New York, NY : IEEE, ISSN 2169-3536, Bd. 8 (2020), insges. 17 S.
- Early Access

https://doi.org/10.1109/ACCESS.2020.3016177
Kuznietsova, Halyna; Dziubenko, Natalia; Herheliuk, Tetiana; Prylutskyy, Yuriy; Täuscher, Eric; Ritter, Uwe; Scharff, Peter;
Water-soluble pristine C60 fullerene inhibits liver alterations associated with hepatocellular carcinoma in rat. - In: Pharmaceutics. - Basel : MDPI, ISSN 1999-4923, Volume 12 (2020), issue 9, 794, Seite 1-20
- Richtiger Name des Verfassers: Eric Täuscher

https://doi.org/10.3390/pharmaceutics12090794
Schweitzer, Dietrich; Haueisen, Jens; Brauer, Jakob Lauritz; Hammer, Martin; Klemm, Matthias;
Comparison of algorithms to suppress artifacts from the natural lens in fluorescence lifetime imaging ophthalmoscopy (FLIO). - In: Biomedical optics express. - Washington, DC : OSA, ISSN 2156-7085, Bd. 11 (2020), 10, S. 5586-5602

https://doi.org/10.1364/BOE.400059
Schricker, Klaus; Ganß, Martin; Könke, Carsten; Bergmann, Jean Pierre;
Feasibility study of using integrated fiber optical sensors to monitor laser-assisted metal-polymer joining. - In: Welding in the world : the international journal of materials joining.. - Berlin : Springer, ISSN 1878-6669, Bd. 64 (2020), 9, S. 1565-1578

The possibilities and challenges of using fiber optical sensors to monitor the laser-assisted joining of metal-polymer joints have been described in this article. Fundamental investigation proves the basic suitability of the measuring method for this application and studies the effect of essential influencing variables of the joining process - e.g., the clamping force - on the resulting sensor signals. In addition, the strain state (because of the process temperature and shrinkage of the polymer) of the parts to be joined can be traced as a function of the joining partners, the process parameters, and the material thicknesses. It is shown that the fiber optical method is suitable for process monitoring directly in the joining zone of metal-polymer hybrids and providing a tool for detailed strain measurements in the joint zone during subsequent component testing.



https://doi.org/10.1007/s40194-020-00942-y
Köhler, Michael; Beetz, Nancy; Günther, Mike; Möller, Frances; Schüler, Tim; Cao, Jialan;
Microbial community types and signature-like soil bacterial patterns from fortified prehistoric hills of Thuringia (Germany). - In: Community ecology : CE ; interdisciplinary journal reporting progress in community and population studies.. - Budapest : Akadémiai Kiadó, ISSN 1588-2756, Bd. 21 (2020), 2, S. 107-120

16S rRNA profiling has been applied for the investigation of bacterial communities of surface soil samples from forest-covered areas of ten prehistorical ramparts from different parts of Thuringia. Besides the majority bacterial types that are present in all samples, there could be identified bacteria that are highly abundant in some places and absent or low abundant in others. These differences are mainly related to the acidity of substrate and distinguish the communities of lime stone hills from soils of sand/quartzite and basalt hills. Minority components of bacterial communities show partially large differences that cannot be explained by the pH of the soil or incidental effects, only. They reflect certain relations between the communities of different places and could be regarded as a kind of signature-like patterns. Such relations had also been found in a comparison of the data from ramparts with formerly studied 16S rRNA profiling from an iron-age burial field. The observations are supporting the idea that a part of the components of bacterial communities from soil samples reflect their ecological history and can be understood as the "ecological memory" of a place. Probably such memory effects can date back to prehistoric times and might assist in future interpretations of archaeological findings on the prehistoric use of a place, on the one hand. On the other hand, the genetic profiling of soils of prehistoric places contributes to the evaluation of anthropogenic effects on the development of local soil bacterial diversity.



https://doi.org/10.1007/s42974-020-00017-4
Halm, Cynthia; Otto, Andreas; Stark, Tilman; Schaaf, Peter;
Ultrasonic excitation during press-fit joining of electrical contacts. - In: The international journal of advanced manufacturing technology. - London : Springer, ISSN 1433-3015, Bd. 109 (2020), 7/8, S. 2215-2220

https://doi.org/10.1007/s00170-020-05760-6