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  • 1
    Online Resource
    Online Resource
    In Situ Analytical Techniques: Solid Electrolyte Interface Analysis of Al Anode Materials for Al-Ion Batteries
    The Electrochemical Society ; 2022
    In:  ECS Meeting Abstracts Vol. MA2022-02, No. 1 ( 2022-10-09), p. 97-97
    Details
    In: ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2022-02, No. 1 ( 2022-10-09), p. 97-97
    Abstract: Rechargeable post Li-ion batteries based on aluminum (Al) are gaining attention due to high abundance of Al, the high theoretical volumetric capacity, and high safety associated with the low flammability [1,2]. In comparison to Li-ion batteries (LiBs), where the solid-electrolyte interphase (SEI) has been studied for decades, little is known on SEI formation in dependence of the used electrolyte for Al electrodes. In this study, we present the electrochemical performance of Al foils with two different thicknesses (0.025 mm and 0.075 mm), which were used as negative electrode in Al-ion batteries in AlCl 3 /1-ethyl-3-methylimidazolium chloride [EMIm]Cl electrolyte. Atomic force microscopy (AFM) was used to determine changes in the morphology of Al foils during the charge - discharge process to obtain information on the SEI and its microstructural morphology [3] . Spatially-resolved information on the electrochemical activity of interphase layers on cycled Al foils can be obtained via scanning electrochemical microscopy (SECM), which so far has only be studied at LiBs [4]. First results reveal the correlation between the morphological changes of SEI layer during cycling and its electrochemical behavior depending on the Al foil surface properties, which will be presented and discussed in this contribution. Key words: Al foil, AFM, microstructure, SEI layer, SECM. References: Meng-Chang Lin, Ming Gong, Bingan Lu, Yingpeng Wu, Di-Yan Wang, Mingyun Guan, Michael Angell, Changxin Chen, Jiang Yang, Bing-Joe Hwang and Hongjie Dai, Nature, 520, 325–328 (2015). Li, and N.J. Bjerrum, J. Power Sources, 110, 1–10 (2002). Feng Wu, Na Zhu, Ying Bai, Yaning Gao, and Chuan Wu, Green Energy & Environment 3, 71-77, (2018). Bastian Krueger, Luis Balboa, Jan Frederik Dohmann, Martin Winter, Peter Bieker and Gunther Wittstock. ChemElectroChem,7, 3590–3596, (2020). This work contributes to the research performed at CELEST (Center for Electrochemical Energy Storage Ulm-Karlsruhe) and was funded by the German Research Foundation (DFG) under Project ID 390874152 (POLiS Cluster of Excellence).
    Type of Medium: Online Resource
    ISSN: 2151-2043
    URL: Article
    DOI: 10.1149/MA2022-02197mtgabs
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2022
    detail.hit.zdb_id: 2438749-6
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  • 2
    Online Resource
    Online Resource
    Direct infrared spectroscopy for the size-independent identification and quantification of respirable particles relative mass in mine dusts
    Springer Science and Business Media LLC ; 2020
    In:  Analytical and Bioanalytical Chemistry Vol. 412, No. 14 ( 2020-05), p. 3499-3508
    Details
    In: Analytical and Bioanalytical Chemistry, Springer Science and Business Media LLC, Vol. 412, No. 14 ( 2020-05), p. 3499-3508
    Abstract: Due to the global need for energy and resources, many workers are involved in underground and surface mining operations where they can be exposed to potentially hazardous crystalline dust particles. Besides commonly known alpha quartz, a variety of other materials may be inhaled when a worker is exposed to airborne dust. To date, the challenge of rapid in-field monitoring, identification, differentiation, and quantification of those particles has not been solved satisfactorily, in part because conventional analytical techniques require laboratory environments, complex method handling, and tedious sample preparation procedures and are in part limited by the effects of particle size. Using a set of the three most abundant minerals in limestone mine dust (i.e., calcite, dolomite, and quartz) and real-world dust samples, we demonstrate that Fourier transform infrared (FTIR) spectroscopy in combination with appropriate multivariate data analysis strategies provides a versatile tool for the identification and quantification of the mineral composition in relative complex matrices. An innovative analytical method with the potential of in-field application for quantifying the relative mass of crystalline particles in mine dust has been developed using transmission and diffuse reflection infrared Fourier transform spectroscopy (DRIFTS) within a unified multivariate model. This proof-of-principle study shows how direct on-site quantification of crystalline particles in ambient air may be accomplished based on a direct-on-filter measurement, after mine dust particles are collected directly onto PVC filters by the worker using body-mounted devices. Without any further sample preparation, these loaded filters may be analyzed via transmission infrared (IR) spectroscopy and/or DRIFTS, and the mineral content is immediately quantified via a partial least squares regression (PLSR) algorithm that enables the combining of the spectral data of both methods into a single robust model. Furthermore, it was also demonstrated that the size regime of dust particles may be classified into groups of hazardous and less hazardous size regimes. Thus, this technique may provide additional essential information for controlling air quality in surface and underground mining operations.
    Type of Medium: Online Resource
    ISSN: 1618-2642 , 1618-2650
    URL: Article
    DOI: 10.1007/s00216-020-02565-0
    RVK:
    VA 4300
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2020
    detail.hit.zdb_id: 1459122-4
    detail.hit.zdb_id: 2071767-2
    SSG: 12
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  • 3
    Online Resource
    Online Resource
    Redox Switchable Polydopamine-Modified AFM-SECM Probes: A Probe for Electrochemical Force Spectroscopy
    American Chemical Society (ACS) ; 2020
    In:  Analytical Chemistry Vol. 92, No. 12 ( 2020-06-16), p. 8404-8413
    Details
    In: Analytical Chemistry, American Chemical Society (ACS), Vol. 92, No. 12 ( 2020-06-16), p. 8404-8413
    Type of Medium: Online Resource
    ISSN: 0003-2700 , 1520-6882
    URL: Article
    URL: Article
    DOI: 10.1021/acs.analchem.0c00995
    DOI: 10.1021/acs.analchem.0c00995.s001
    Language: English
    Publisher: American Chemical Society (ACS)
    Publication Date: 2020
    detail.hit.zdb_id: 1483443-1
    detail.hit.zdb_id: 1508-8
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  • 4
    Online Resource
    Online Resource
    Surface Properties‐Performance Relationship of Aluminum Foil as Negative Electrode for Rechargeable Aluminum Batteries
    Wiley ; 2023
    In:  Batteries & Supercaps
    Details
    In: Batteries & Supercaps, Wiley
    Abstract: Rechargeable aluminum batteries with aluminum metal as a negative electrode have attracted wide attention due to the aluminum abundance, its high theoretical capacity and stability under ambient conditions. Understanding and ultimately screening the impact of the initial surface properties of aluminum negative electrodes on the performance and lifetime of the battery cell are of great significance. The purity, surface finishing and degree of hardness of aluminum metal may strongly impact the device's performance, but these properties have not been systematically studied so far. Here, we present an investigation of the underestimated but crucial role of the aluminum foil surface properties on its electrochemical behavior in aluminum battery half‐cells. The results show that commercial aluminum foils with the same purity and degree of hardness but with different thicknesses (from 0.025 to 0.1 mm) exhibit different microstructure and surface roughness, which in turn have an impact on the cyclability. Atomic force microscopy studies show that the aluminum foil is corroded after repeated electrochemical cycling, thus leading to cell failure. The sample with 0.075 mm thickness exhibits the best cycling stability.
    Type of Medium: Online Resource
    ISSN: 2566-6223 , 2566-6223
    URL: Article
    DOI: 10.1002/batt.202300298
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 2897248-X
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  • 5
    Online Resource
    Online Resource
    From molecular to colloidal manganese vanadium oxides for water oxidation catalysis
    Royal Society of Chemistry (RSC) ; 2017
    In:  Chem. Commun. Vol. 53, No. 84 ( 2017), p. 11576-11579
    Details
    In: Chem. Commun., Royal Society of Chemistry (RSC), Vol. 53, No. 84 ( 2017), p. 11576-11579
    Type of Medium: Online Resource
    ISSN: 1359-7345 , 1364-548X
    URL: Article
    DOI: 10.1039/C7CC06840A
    Language: English
    Publisher: Royal Society of Chemistry (RSC)
    Publication Date: 2017
    detail.hit.zdb_id: 1472881-3
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  • 6
    Online Resource
    Online Resource
    Physicochemical and Electrochemical Characterization of Electropolymerized Polydopamine Films: Influence of the Deposition Process
    MDPI AG ; 2021
    In:  Nanomaterials Vol. 11, No. 8 ( 2021-07-30), p. 1964-
    Details
    In: Nanomaterials, MDPI AG, Vol. 11, No. 8 ( 2021-07-30), p. 1964-
    Abstract: Polydopamine (PDA) is a synthetic eumelanin polymer which is, to date, mostly obtained by dip coating processes. In this contribution, we evaluate the physical and electrochemical properties of electrochemically deposited PDA films obtained by cyclic voltammetry or pulsed deposition. The obtained PDA thin films are investigated with respect to their electrochemical properties, i.e., electron transfer (ET) kinetics and charge transfer resistance using scanning electrochemical microscopy and electrochemical impedance spectroscopy, and their nanomechanical properties, i.e., Young’s modulus and adhesion forces at varying experimental conditions, such as applied potential or pH value of the medium using atomic force microscopy. In particular, the ET behavior at different pH values has not to date been investigated in detail for electrodeposited PDA thin films, which is of particular interest for a multitude of applications. Adhesion forces strongly depend on applied potential and surrounding pH value. Moreover, force spectroscopic measurements reveal a significantly higher percentage of polymeric character compared to films obtained by dip coating. Additionally, distinct differences between the two depositions methods are observed, which indicate that the pulse deposition process leads to denser, more cross-linked films.
    Type of Medium: Online Resource
    ISSN: 2079-4991
    URL: Article
    DOI: 10.3390/nano11081964
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2662255-5
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  • 7
    Online Resource
    Online Resource
    polyHWG: 3D Printed Substrate-Integrated Hollow Waveguides for Mid-Infrared Gas Sensing
    American Chemical Society (ACS) ; 2017
    In:  ACS Sensors Vol. 2, No. 11 ( 2017-11-22), p. 1700-1705
    Details
    In: ACS Sensors, American Chemical Society (ACS), Vol. 2, No. 11 ( 2017-11-22), p. 1700-1705
    Type of Medium: Online Resource
    ISSN: 2379-3694 , 2379-3694
    URL: Article
    DOI: 10.1021/acssensors.7b00649
    Language: English
    Publisher: American Chemical Society (ACS)
    Publication Date: 2017
    detail.hit.zdb_id: 2843497-3
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  • 8
    Online Resource
    Online Resource
    Template‐ and Additive‐free Electrosynthesis and Characterization of Spherical Gold Nanoparticles on Hydrophobic Conducting Polydimethylsiloxane
    Wiley ; 2017
    In:  Chemistry – An Asian Journal Vol. 12, No. 13 ( 2017-07-04), p. 1615-1624
    Details
    In: Chemistry – An Asian Journal, Wiley, Vol. 12, No. 13 ( 2017-07-04), p. 1615-1624
    Abstract: Carbon ‐ doped poly(dimethylsiloxane) (C ‐ PDMS) modified with gold nanoparticles (AuNPs) is a highly promising material for the development of flexible lab ‐ on ‐ chip biosensors. Here, we present an electrochemical method to prepare stabilizer ‐ free AuNPs directly on hydrophobic conducting substrates like C ‐ PDMS without physical or chemical pre ‐ treatment of the C ‐ PDMS substrate. Using a potentiostatic triple pulse strategy, spherical, non ‐ stabilized AuNPs of diameter 76±5 nm could be deposited within 5 s with narrow size ‐ dispersion on the hydrophobic C ‐ PDMS substrate in the absence of any structure directing or stabilizing agent. The detailed investigation of the mechanism of electrochemical formation of gold seeds and their three ‐ dimensional growth on the hydrophobic surface along with nanomechanical atomic force — scanning electrochemical microscopy (QNM ‐ AFM ‐ SECM) characterization as well as conductive AFM allowed developing this fast electrochemical strategy with control in the desired size and size ‐ dispersion of AuNPs. A detailed electrochemical investigation using cyclic voltammetry, anodic differential pulse voltammetry, and electrochemical impedance spectroscopy was conducted to characterize the electrochemical behavior of uncapped AuNPs deposited on C ‐ PDMS. The Fc + (MeOH) 2 /Fc(MeOH) 2 redox reaction at AuNPs ‐ C ‐ PDMS showed an improved charge transfer coefficient and heterogeneous charge transfer rate constant compared to the bare C ‐ PDMS substrate.
    Type of Medium: Online Resource
    ISSN: 1861-4728 , 1861-471X
    URL: Issue
    URL: Article
    DOI: 10.1002/asia.v12.13
    DOI: 10.1002/asia.201700444
    Language: English
    Publisher: Wiley
    Publication Date: 2017
    detail.hit.zdb_id: 2233006-9
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  • 9
    Online Resource
    Online Resource
    (Invited) Dual Functional Platinum Black-modified Miniaturized Electrodes for Hydrogenperoxide Detection
    The Electrochemical Society ; 2022
    In:  ECS Meeting Abstracts Vol. MA2022-01, No. 53 ( 2022-07-07), p. 2226-2226
    Details
    In: ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2022-01, No. 53 ( 2022-07-07), p. 2226-2226
    Abstract: Microelectrochemistry has a long history in the life sciences for in vivo and in vitro measurements of e.g., pH, oxygen, and signaling molecules such as nitric oxide (NO), adenosine-5`-triphosphate (ATP), hydrogen peroxide (H2O2) and neurotransmitters. In particular, gaining information on signaling molecules at live cells, e.g., during and after stimulation is of significance for understanding cell signaling. Within recent years, our research team has focused on the development of micro-sized sensing approaches for the detection of ATP [1,2], which is considered among the most important autocrine and paracrine signaling molecules [3]. H2O2 belongs to the group of reactive oxygen species (ROS), which is in contrast to radical ROS rather stable. H2O2 is involved in many physiological processes such as hypoxic signal transduction, cell differentiation and proliferation but is also involved in mediating immune responses [4]. The effect is, among other parameters, dependent on its local concentration and its exposure time. Platinum black is a highly suitable electrocatalytic nanomaterial for the electrochemical detection of H2O2 [5]. We recently demonstrated that Pt black modified microelectrodes can be used for H2O2 at granulocytes and peripheral blood mononuclear cells from pigs [6]. Within this presentation, we will introduce dual functional miniaturized probes that allow further miniaturization of electrochemical sensors for biomedical applications. We will demonstrate that these probes have great potential for cell measurements, i.e., at macrophages that produce and release ROS in response to phagocytosis or stimulation. References [1] E. Hecht, A. Liedert, A. Ignatius, B. Mizaikoff, C. Kranz, Biosens. Bioelectron. 2013, 44, 27. [2] C. Ziller, et al., ChemElectroChem 2017, 4, 864. [3] R. Corriden, P. A. Insel, Sci. Signal. 2010, 3, 104. [4] C. Lennicke et al., Cell Commun. Signal. 2015, 13, 39. [5] Y. Li, C. Sella, F. Lemaitre, M.G. Collignon, L. Thouin, C. Amatore, Electroanalysis 2013, 25, 895. [6] A. Hellmann, S. Daboss, F. Zink, C. Hartmann, P. Radermacher, C. Kranz, Electrochim. Acta 2020, 353, 30851
    Type of Medium: Online Resource
    ISSN: 2151-2043
    URL: Article
    DOI: 10.1149/MA2022-01532226mtgabs
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2022
    detail.hit.zdb_id: 2438749-6
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  • 10
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    Online Resource
    Multiscale Investigation of Sodium‐Ion Battery Anodes: Analytical Techniques and Applications
    Wiley ; 2024
    In:  Advanced Energy Materials
    Details
    In: Advanced Energy Materials, Wiley
    Abstract: The anode/electrolyte interface behavior, and by extension, the overall cell performance of sodium‐ion batteries is determined by a complex interaction of processes that occur at all components of the electrochemical cell across a wide range of size‐ and timescales. Single‐scale studies may provide incomplete insights, as they cannot capture the full picture of this complex and intertwined behavior. Broad, multiscale studies are essential to elucidate these processes. Within this perspectives article, several analytical and theoretical techniques are introduced, and described how they can be combined to provide a more complete and comprehensive understanding of sodium‐ion battery (SIB) performance throughout its lifetime, with a special focus on the interfaces of hard carbon anodes. These methods target various length‐ and time scales, ranging from micro to nano, from cell level to atomistic structures, and account for a broad spectrum of physical and (electro)chemical characteristics. Specifically, how mass spectrometric, microscopic, spectroscopic, electrochemical, thermodynamic, and physical methods can be employed to obtain the various types of information required to understand battery behavior will be explored. Ways are then discussed how these methods can be coupled together in order to elucidate the multiscale phenomena at the anode interface and develop a holistic understanding of their relationship to overall sodium‐ion battery function.
    Type of Medium: Online Resource
    ISSN: 1614-6832 , 1614-6840
    URL: Article
    DOI: 10.1002/aenm.202302830
    Language: English
    Publisher: Wiley
    Publication Date: 2024
    detail.hit.zdb_id: 2594556-7
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