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  1. Article ; Online: Controlling the Superconductivity of Nb

    Elgaml, Mahmoud / Dey, Sunita / Cen, Jiayi / Avdeev, Maxim / Scanlon, David O / Grey, Clare P / Clarke, Simon J

    Inorganic chemistry

    2024  Volume 63, Issue 2, Page(s) 1151–1165

    Abstract: ... The ... ...

    Abstract The Nb
    Language English
    Publishing date 2024-01-04
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1484438-2
    ISSN 1520-510X ; 0020-1669
    ISSN (online) 1520-510X
    ISSN 0020-1669
    DOI 10.1021/acs.inorgchem.3c03524
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Microstructures of layered Ni-rich cathodes for lithium-ion batteries.

    Lu, Jingyu / Xu, Chao / Dose, Wesley / Dey, Sunita / Wang, Xihao / Wu, Yehui / Li, Deping / Ci, Lijie

    Chemical Society reviews

    2024  Volume 53, Issue 9, Page(s) 4707–4740

    Abstract: Millions of electric vehicles (EVs) on the road are powered by lithium-ion batteries (LIBs) based on nickel-rich layered oxide (NRLO) cathodes, and they suffer from a limited driving range and safety concerns. Increasing the Ni content is a key way to ... ...

    Abstract Millions of electric vehicles (EVs) on the road are powered by lithium-ion batteries (LIBs) based on nickel-rich layered oxide (NRLO) cathodes, and they suffer from a limited driving range and safety concerns. Increasing the Ni content is a key way to boost the energy densities of LIBs and alleviate the EV range anxiety, which are, however, compromised by the rapid performance fading. One unique challenge lies in the worsening of the microstructural stability with a rising Ni-content in the cathode. In this review, we focus on the latest advances in the understanding of NLRO microstructures, particularly the microstructural degradation mechanisms, state-of-the-art stabilization strategies, and advanced characterization methods. We first elaborate on the fundamental mechanisms underlying the microstructural failures of NRLOs, including anisotropic lattice evolution, microcracking, and surface degradation, as a result of which other degradation processes, such as electrolyte decomposition and transition metal dissolution, can be severely aggravated. Afterwards, we discuss representative stabilization strategies, including the surface treatment and construction of radial concentration gradients in polycrystalline secondary particles, the fabrication of rod-shaped primary particles, and the development of single-crystal NRLO cathodes. We then introduce emerging microstructural characterization techniques, especially for identification of the particle orientation, dynamic changes, and elemental distributions in NRLO microstructures. Finally, we provide perspectives on the remaining challenges and opportunities for the development of stable NRLO cathodes for the zero-carbon future.
    Language English
    Publishing date 2024-05-07
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 1472875-8
    ISSN 1460-4744 ; 0306-0012
    ISSN (online) 1460-4744
    ISSN 0306-0012
    DOI 10.1039/d3cs00741c
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Synthesis and Characterization of Magnesium Vanadates as Potential Magnesium-Ion Cathode Materials through an Ab Initio Guided Carbothermal Reduction Approach.

    Lee, Jeongjae / Dey, Sunita / Dutton, Siân E / Grey, Clare P

    Angewandte Chemie (International ed. in English)

    2022  Volume 61, Issue 8, Page(s) e202112688

    Abstract: Many technologically relevant materials for advanced energy storage and catalysis feature reduced transition-metal (TM) oxides that are often nontrivial to prepare because of the need to control the reducing nature of the atmosphere in which they are ... ...

    Abstract Many technologically relevant materials for advanced energy storage and catalysis feature reduced transition-metal (TM) oxides that are often nontrivial to prepare because of the need to control the reducing nature of the atmosphere in which they are synthesized. Herein, we show that an ab initio predictive synthesis strategy can be used to produce multi-gram-scale products of various MgV
    Language English
    Publishing date 2022-01-11
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2011836-3
    ISSN 1521-3773 ; 1433-7851
    ISSN (online) 1521-3773
    ISSN 1433-7851
    DOI 10.1002/anie.202112688
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Solar thermochemical splitting of water to generate hydrogen.

    Rao, C N R / Dey, Sunita

    Proceedings of the National Academy of Sciences of the United States of America

    2017  Volume 114, Issue 51, Page(s) 13385–13393

    Abstract: Solar photochemical means of splitting water (artificial photosynthesis) to generate hydrogen is emerging as a viable process. The solar thermochemical route also promises to be an attractive means of achieving this objective. In this paper we present ... ...

    Abstract Solar photochemical means of splitting water (artificial photosynthesis) to generate hydrogen is emerging as a viable process. The solar thermochemical route also promises to be an attractive means of achieving this objective. In this paper we present different types of thermochemical cycles that one can use for the purpose. These include the low-temperature multistep process as well as the high-temperature two-step process. It is noteworthy that the multistep process based on the Mn(II)/Mn(III) oxide system can be carried out at 700 °C or 750 °C. The two-step process has been achieved at 1,300 °C/900 °C by using yttrium-based rare earth manganites. It seems possible to render this high-temperature process as an isothermal process. Thermodynamics and kinetics of H
    Language English
    Publishing date 2017--19
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.1700104114
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 1148: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
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  5. Article: Effects of Atmospheric Gases on Li Metal Cyclability and Solid-Electrolyte Interphase Formation.

    Wang, Evelyna / Dey, Sunita / Liu, Tao / Menkin, Svetlana / Grey, Clare P

    ACS energy letters

    2020  Volume 5, Issue 4, Page(s) 1088–1094

    Abstract: For Li-air batteries, dissolved gas can cross over from the air electrode to the Li metal anode and affect the solid-electrolyte interphase (SEI) formation, a phenomenon that has not been fully characterized. In this work, the impact of atmospheric gases ...

    Abstract For Li-air batteries, dissolved gas can cross over from the air electrode to the Li metal anode and affect the solid-electrolyte interphase (SEI) formation, a phenomenon that has not been fully characterized. In this work, the impact of atmospheric gases on the SEI properties is studied using electrochemical methods and ex situ characterization techniques, including X-ray photoelectron spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy. The presence of O
    Language English
    Publishing date 2020-03-10
    Publishing country United States
    Document type Journal Article
    ISSN 2380-8195
    ISSN 2380-8195
    DOI 10.1021/acsenergylett.0c00257
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  6. Article ; Online: Anion redox as a means to derive layered manganese oxychalcogenides with exotic intergrowth structures.

    Sasaki, Shunsuke / Giri, Souvik / Cassidy, Simon J / Dey, Sunita / Batuk, Maria / Vandemeulebroucke, Daphne / Cibin, Giannantonio / Smith, Ronald I / Holdship, Philip / Grey, Clare P / Hadermann, Joke / Clarke, Simon J

    Nature communications

    2023  Volume 14, Issue 1, Page(s) 2917

    Abstract: Topochemistry enables step-by-step conversions of solid-state materials often leading to metastable structures that retain initial structural motifs. Recent advances in this field revealed many examples where relatively bulky anionic constituents were ... ...

    Abstract Topochemistry enables step-by-step conversions of solid-state materials often leading to metastable structures that retain initial structural motifs. Recent advances in this field revealed many examples where relatively bulky anionic constituents were actively involved in redox reactions during (de)intercalation processes. Such reactions are often accompanied by anion-anion bond formation, which heralds possibilities to design novel structure types disparate from known precursors, in a controlled manner. Here we present the multistep conversion of layered oxychalcogenides Sr
    Language English
    Publishing date 2023-05-22
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-38489-3
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  7. Article: Significant reduction in the operating temperature of the Mn(ii)/Mn(iii) oxide-based thermochemical water splitting cycle brought about by the use of nanoparticles

    Dey, Sunita / Rajesh, S / Rao, C. N. R

    Journal of materials chemistry A. 2016 Nov. 1, v. 4, no. 43

    2016  

    Abstract: Among the many efforts to devise thermochemical cycles to generate H2 by water splitting, the Mn(ii)/Mn(iii) oxide based cycle operating at 850 °C is a significant one and involves no toxic and corrosive materials. The essential process in this cycle is ... ...

    Abstract Among the many efforts to devise thermochemical cycles to generate H2 by water splitting, the Mn(ii)/Mn(iii) oxide based cycle operating at 850 °C is a significant one and involves no toxic and corrosive materials. The essential process in this cycle is the shuttling of Na+ ions in and out of Mn oxides. In an effort to bring down the temperature of this cycle, we have found that the use of Mn3O4 nanoparticles is particularly effective. Ball milling has been applied to decrease the particle size of commercial Mn3O4 to less than 500 nm. Thus the solid state reaction between Na2CO3 and Mn3O4 nanoparticles occurs at a temperature 200 °C lower than with bulk samples. One of the challenges of this particular cycle lies in its slow H2 evolution. It has been possible to operate this cycle and generate H2 at a much faster rate at 750 °C and even at 700 °C by this means. Furthermore, the step involving hydrolysis of NaMnO2 can be performed at 50 °C instead of 100 °C.
    Keywords hydrogen ; hydrogen production ; hydrolysis ; ions ; manganese ; manganese oxides ; milling ; nanoparticles ; particle size ; sodium ; sodium carbonate ; temperature ; toxicity
    Language English
    Dates of publication 2016-1101
    Size p. 16830-16833.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 2702232-8
    ISSN 2050-7496 ; 2050-7488
    ISSN (online) 2050-7496
    ISSN 2050-7488
    DOI 10.1039/c6ta06271g
    Database NAL-Catalogue (AGRICOLA)

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  8. Article: Structural Evolution of Layered Manganese Oxysulfides during Reversible Electrochemical Lithium Insertion and Copper Extrusion.

    Dey, Sunita / Zeng, Dongli / Adamson, Paul / Cabana, Jordi / Indris, Sylvio / Lu, Jingyu / Clarke, Simon J / Grey, Clare P

    Chemistry of materials : a publication of the American Chemical Society

    2021  Volume 33, Issue 11, Page(s) 3989–4005

    Abstract: The electrochemical lithiation and delithiation of the layered oxysulfide ... ...

    Abstract The electrochemical lithiation and delithiation of the layered oxysulfide Sr
    Language English
    Publishing date 2021-05-24
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1500399-1
    ISSN 1520-5002 ; 0897-4756
    ISSN (online) 1520-5002
    ISSN 0897-4756
    DOI 10.1021/acs.chemmater.1c00375
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  9. Article: Toward an Understanding of SEI Formation and Lithium Plating on Copper in Anode-Free Batteries.

    Menkin, Svetlana / O'Keefe, Christopher A / Gunnarsdóttir, Anna B / Dey, Sunita / Pesci, Federico M / Shen, Zonghao / Aguadero, Ainara / Grey, Clare P

    The journal of physical chemistry. C, Nanomaterials and interfaces

    2021  Volume 125, Issue 30, Page(s) 16719–16732

    Abstract: Anode-free" batteries present a significant advantage due to their substantially higher energy density and ease of assembly in a dry air atmosphere. However, issues involving lithium dendrite growth and low cycling Coulombic efficiencies during ... ...

    Abstract "Anode-free" batteries present a significant advantage due to their substantially higher energy density and ease of assembly in a dry air atmosphere. However, issues involving lithium dendrite growth and low cycling Coulombic efficiencies during operation remain to be solved. Solid electrolyte interphase (SEI) formation on Cu and its effect on Li plating are studied here to understand the interplay between the Cu current collector surface chemistry and plated Li morphology. A native interphase layer (N-SEI) on the Cu current collector was observed with solid-state nuclear magnetic resonance spectroscopy (ssNMR) and electrochemical impedance spectroscopy (EIS). Cyclic voltammetry (CV) and time-of-flight secondary ion mass spectrometry (ToF-SIMS) studies showed that the nature of the N-SEI is affected by the copper interface composition. An X-ray photoelectron spectroscopy (XPS) study identified a relationship between the applied voltage and SEI composition. In addition to the typical SEI components, the SEI contains copper oxides (Cu
    Language English
    Publishing date 2021-07-27
    Publishing country United States
    Document type Journal Article
    ISSN 1932-7447
    ISSN 1932-7447
    DOI 10.1021/acs.jpcc.1c03877
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Beneficial effects of substituting trivalent ions in the B-site of La0.5Sr0.5Mn1-xAxO3 (A = Al, Ga, Sc) on the thermochemical generation of CO and H2 from CO2 and H2O.

    Dey, Sunita / Naidu, B S / Rao, C N R

    Dalton transactions (Cambridge, England : 2003)

    2016  Volume 45, Issue 6, Page(s) 2430–2435

    Abstract: The effect of substitution of Al(3+), Ga(3+) and Sc(3+) ions in the Mn(3+) site of La0.5Sr0.5MnO3 on the thermochemical splitting of CO2 to generate CO has been studied in detail. Both La0.5Sr0.5Mn1-xGaxO3 and La0.5Sr0.5Mn1-xScxO3 give high yields of O2 ... ...

    Abstract The effect of substitution of Al(3+), Ga(3+) and Sc(3+) ions in the Mn(3+) site of La0.5Sr0.5MnO3 on the thermochemical splitting of CO2 to generate CO has been studied in detail. Both La0.5Sr0.5Mn1-xGaxO3 and La0.5Sr0.5Mn1-xScxO3 give high yields of O2 and generate CO more efficiently than La0.5Sr0.5Mn1-xAlxO3 or the parent La0.5Sr0.5MnO3. Substitution of even 5% Sc(3+) (x = 0.05) results in a remarkable improvement in performance. Thus La0.5Sr0.5Mn0.95Sc0.05O3 produces 417 μmol g(-1) of O2 and 545 μmol g(-1) of CO, respectively, i.e. 2 and 1.7 times more O2 and CO than La0.5Sr0.5MnO3. This manganite also generates H2 satisfactorily by the thermochemical splitting of H2O.
    Language English
    Publishing date 2016-02-14
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1472887-4
    ISSN 1477-9234 ; 1364-5447 ; 0300-9246 ; 1477-9226
    ISSN (online) 1477-9234 ; 1364-5447
    ISSN 0300-9246 ; 1477-9226
    DOI 10.1039/c5dt04822b
    Database MEDical Literature Analysis and Retrieval System OnLINE

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