Article
Energy & Fuels
Sadegh Aberoumand, Deepak Dubal, Peter Woodfield, Kiran Mahale, Hong Duc Pham, Chinmayee Padwal, Tran Tung, Muhammad JA. Shiddiky, Dzung Viet Dao
Summary: This paper investigates the electrochemical performance of a newly prepared reduced graphene oxide (rGO) nanofluidic vanadium electrolyte for Vanadium Redox Flow Batteries (VRFB). The study finds that the use of rGO nanofluid can enhance the performance of both electrode and electrolyte in the battery. The results show that increasing the concentration of rGO improves the electrochemical performance of the vanadium electrolyte, with approximately 15% to 20% improvements in peak potential separation and current density rates.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Chemistry, Multidisciplinary
Premkumar Senguttuvan, Eungje Lee, Baris Key, Christopher S. Johnson
Summary: Single-phase three-dimensional vanadium oxide (V4O9) was synthesized by reduction of V2O5 using a gas stream of ammonia/argon (NH3/Ar). The as-synthesized oxide was transformed into a disordered rock salt type-Li3.7V4O9 phase while cycling over the voltage window 3.5 to 1.8V vs. Li. The Li-deficient phase delivers superior reversibility and capacity utilization compared to battery grade V2O5 cathodes in lithium cells.
FRONTIERS IN CHEMISTRY
(2023)
Article
Engineering, Environmental
Ruini Zhou, Xiaxia Li, Huan Pang
Summary: This paper reviews the effective synthetic methods for preparing VOx@Graphene and VSx@Graphene nanocomposites, and discusses their high, practical, and economic value in applications for batteries and supercapacitors through analyzing electrochemical characterization images.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Jin-Sung Park, Sungjin Yang, Yun Chan Kang
Summary: The study demonstrates that the porous microspheres consisting of V2O3 anchored on entangled carbon nanotubes exhibit excellent performance as cathode for aqueous zinc-ion batteries, with high reversible capacity and superior electrochemical properties, attributed to their unique structure and composition.
Article
Engineering, Electrical & Electronic
Emtinan Ouda, Nehad Yousf, Hend S. Magar, Rabeay Y. A. Hassan, El-Shazly M. Duraia
Summary: Electrochemical and electro-catalytic properties of graphene and multi-walled carbon nanotubes have been enhanced through doping with manganese oxide nanostructures. The nanocomposites exhibited flower-like microsphere structures in SEM images, and the conjugation of MnO(2) with the carbon nanomaterials was confirmed by FTIR and XRD analysis. The MnO2-based nanocomposites showed significant enhancement in electrochemical activities and could be potential materials for energy storage and hydrogen peroxide sensing applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Sagolsem Nonganbi Chanu, Pukhrambam Sushma, Bhabani Sankar Swain, Bibhu Prasad Swain
Summary: Nanostructured V2O5/rGO nanocomposites prepared by chemical reduction method exhibit excellent electrochemical performance and cycle stability, making them one of the best candidates for supercapacitor application.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Eduard Monaico, Vadim Morari, Veaceslav V. Ursaki, Kornelius Nielsch, Ion M. Tiginyanu
Summary: This study reports the preparation of GaAs nanowire templates using cost-effective electrochemical etching of (001) and (111)B GaAs substrates, and the fabrication of core-shell GaAs-Fe nanowire arrays by galvanostatic Fe deposition. The fabricated arrays were characterized and their magnetic properties were analyzed.
Article
Chemistry, Physical
Likui Wang, Meikang Han, Christopher E. Shuck, Xuehang Wang, Yury Gogotsi
Summary: MXenes are promising pseudocapacitive materials with high specific capacitance. This study synthesized two sets of niobium-based solid-solution MXenes and investigated the relationship between their electrochemical properties and the ratio of transition metals in the structure, finding that higher niobium content can improve cycling stability. This research shows that the electrochemical properties of MXenes can be controlled by adjusting the ratio of transition metals in the MXene structure.
Article
Engineering, Electrical & Electronic
Zartasha Sarwar, Muhammad Umair, Yasir Javed, S. Hussain, Naveed Akhtar Shad, Asim Jilani, Aqeel Ahmed Shah, Muhammad Azam, Sumara Ashraf
Summary: In this study, vanadium-based hybrid capacitors were successfully synthesized and characterized. The V2O5/CeO2 nanocomposite exhibited excellent electrochemical performance, with a higher specific capacity compared to V2O5/rGO and bare V2O5.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Biochemistry & Molecular Biology
Reziwanguli Aihemaitituoheti, Nuha A. Alhebshi, Tuerdimaimaiti Abudula
Summary: This study found that using nickel acetate maintains a flexible fibrous sheet morphology and results in better electrochemical performance compared to nickel nitrate. Combining NiO-A nanofibers with CNTs to form a hybrid electrode enhances the electrochemical storage performance.
Article
Chemistry, Multidisciplinary
Ian D. Johnson, Natalie Stapleton, Gene Nolis, Dustin Bauer, Prakash Parajuli, Hyun Deog Yoo, Liang Yin, Brian J. Ingram, Robert F. Klie, Saul Lapidus, Jawwad A. Darr, Jordi Cabana
Summary: By nanosizing alpha-V2O5, a reduction in voltage hysteresis and improved energy efficiency is achieved, revealing the contribution of mechanical formatting to hysteresis. However, there is no significant improvement in hysteresis in later cycles, indicating that factors other than Mg transport also play a role. This study uncovers critical limiting factors in Mg battery electrochemistry, paving the way for high-voltage, high-capacity electrode materials for Mg batteries with high energy density.
Review
Materials Science, Multidisciplinary
Xiaoping Huang, Yufang Zhu, Ehsan Kianfar
Summary: A sensor is a tool that measures test compounds in a sample directly, with nanosensors specifically using nanostructures for detection. Biological sensors utilize biological elements for detection, while the simultaneous use of nanostructures and electrochemical techniques has led to the development of sensors with high sensitivity and decomposition capabilities.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Electrical & Electronic
Nur Ezyanie Safie, Mohd Asyadi Azam, Chun Khean Chiew, Mohd Fareezuan Abdul Aziz, Mohamad Nazmi Faiz Md Sairi, Akito Takasaki
Summary: This study focuses on utilizing reduced graphene oxide (rGO) as an active material for the anode of lithium-ion batteries (LIBs). Through electrochemical performance analysis, it is found that commercial rGO shows better performance and cyclic stability, demonstrating potential for producing high energy density batteries.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Wentao Ni, Hengyu Yang, Xiong Liu, Yongle Liang, Banghui Wu, Huaijun Zhang, Guobao Xu, Xiaolin Wei, Liwen Yang
Summary: Novel 2D sandwich-like heterostructures of amorphous vanadium dioxide grown on MXene nanosheets are used as freestanding cathodes for aqueous zinc-ion batteries. These cathodes exhibit high capacity, rate capability, and cycling stability due to their unique structure and conductivity. They also show potential for applications in energy storage.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Eduart Gutierrez-Pineda, Ahmed Subrati, Maria Jose Rodriguez-Presa, Claudio A. Gervasi, Sergio E. Moya
Summary: This paper presents an electrochemical exfoliation method for producing graphene oxide and characterizes it using electrochemical techniques. The electrochemical behavior of the produced graphene oxide was studied through cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Additionally, various characterization techniques such as X ray Photoelectronic Spectroscopy (XPS), Raman spectroscopy, Transmission Electron Microscopy (TEM), and Atomic Force Microscopy (AFM) were employed to analyze the structural and chemical properties of the exfoliated graphene oxide. The results demonstrate that the electrochemical exfoliation method allows for the production of graphene oxide materials with varying degrees of oxidation, defect density, and crystallite size.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Physics, Atomic, Molecular & Chemical
A. Alfonsov, B. Buechner, V. Kataev
Summary: The study proposes the use of a cantilever-based setup to overcome challenges posed by small sample sizes, enabling detection of static magnetic response and ESR signal in novel magnetic materials samples.
APPLIED MAGNETIC RESONANCE
(2022)
Article
Chemistry, Physical
Morgan C. Allison, Sabine Wurmehl, Bernd Buechner, Joseph L. Vella, Tilo Soehnel, Sascha A. Braeuninger, Hans-Henning Klauss, Maxim Avdeev, Frederick P. Marlton, Siegbert Schmid, Chris D. Ling
Summary: FeMn3Ge2Sn7O16 is a fully ordered stoichiometric phase with an undistorted hexagonal kagome' lattice of Mn2+ cations. By replacing silicon with germanium and anisotropic high-spin Fe2+ with isotropic high-spin Mn2+, the perfection of the kagome lattice is improved, ruling out single-ion anisotropy as the driving force for the unique properties of the compounds.
CHEMISTRY OF MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Vitaliy Romaka, Ahmad Omar, Wolfgang Loeser, Bernd Buechner, Sabine Wurmehl
Summary: Investigations into the thermodynamic phase diagram of Co-based Heusler phases, focusing on the quaternary region of CoCrCoAl-CoFe, revealed critical points and immiscibility regions through DFT and thermodynamic calculations, offering valuable insights for materials design.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Olga Kataeva, Kamil Ivshin, Kirill Metlushka, Kristina Nikitina, Vera Khrizanforova, Yulia Budnikova, Robert R. Fayzullin, Shamil Latypov, Sandra Schiemenz, Michael Bretschneider, Alexey Popov, Stanislav Avdoshenko, Yulia Krupskaya, Bernd Buchner, Martin Knupfer
Summary: A series of new charge-transfer cocrystals of F(2)TCNQ with anthracene, tetracene, and chrysene were prepared and characterized. The study revealed that face-to-face pi-pi interactions are crucial for the formation of cocrystals, but lateral noncovalent interactions also play a significant role in the supramolecular arrangement and charge transfer. UV/vis spectroscopy and electronic structure quantum chemical calculations classified these cocrystals as small-gap semiconductors with energy gaps of 0.7-1.3 eV.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Chemistry, Inorganic & Nuclear
Nitish Kumar Garg, Yogesh Goriya, Seetharaman Manojveer, Senada Muratovic, Damir Pajic, Mario Cetina, Irina Petreska, Yulia Krupskaya, Vladislav Kataev, Magnus T. Johnson, Ola F. Wendt, Dijana Zilic
Summary: A new mononuclear iron(iii) octahedral complex, [FeL6](BF4)3, has been synthesized from the reaction between 2-hydroxy-6-methylpyridine (L) and iron(ii) tetrafluoroborate. The color of the complex changes reversibly from red to yellow-orange with temperature. Magnetization measurements show that the iron(iii) in [FeL6](BF4)3 is in a high-spin state. Although spin-crossover is not observed, X-band and multifrequency high-field/high-frequency electron spin resonance (ESR) spectroscopy reveal unusual iron(iii) spectra at room temperature and changes with cooling.
DALTON TRANSACTIONS
(2022)
Article
Nanoscience & Nanotechnology
Daniel Wolf, Sebastian Schneider, Ulrich K. Rossler, Andras Kovacs, Marcus Schmidt, Rafal E. Dunin-Borkowski, Bernd Buechner, Bernd Rellinghaus, Axel Lubk
Summary: Holographic vector-field electron tomography quantitatively reconstructed the three-dimensional magnetic texture of Bloch skyrmion tubes in FeGe with sub-10-nanometre resolution, revealing complex three-dimensional modulations and fundamental principles of skyrmion formation.
NATURE NANOTECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Rui Lou, Alexander Fedorov, Qiangwei Yin, Andrii Kuibarov, Zhijun Tu, Chunsheng Gong, Eike F. Schwier, Bernd Buechner, Hechang Lei, Sergey Borisenko
Summary: The entanglement of charge density wave (CDW), superconductivity, and topologically nontrivial electronic structure has been discovered in the kagome metal AV3Sb5 (A = K, Rb, Cs) family recently. Using high-resolution angle-resolved photoemission spectroscopy, the electronic properties of CDW and superconductivity in CsV3Sb5 are studied. The spectra around K over line exhibit a peak-dip-hump structure associated with two separate branches of dispersion, indicating the isotropic CDW gap opening below EF. The presence of a superconducting gap on both the electron band around Gamma over line and the flat band around K suggests multiband superconductivity. Our results shed light on the controversial origin of the CDW and provide insights into the relationship between CDW and superconductivity.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Physical
Lorenzo Francesco Madeo, Patrizia Sarogni, Giuseppe Cirillo, Orazio Vittorio, Valerio Voliani, Manuela Curcio, Tyler Shai-Hee, Bernd Buechner, Michael Mertig, Silke Hampel
Summary: A hybrid hydrogel was developed by loading curcumin onto graphene oxide nanosheets and blending them into an alginate hydrogel. The resulting system showed improved stability and exhibited strong anticancer effects.
Article
Materials Science, Multidisciplinary
M. Iakovleva, T. Petersen, A. Alfonsov, Y. Skourski, H. -J. Grafe, E. Vavilova, R. Nath, L. Hozoi, V. Kataev
Summary: A comprehensive study was conducted on the magnetic and electron spin resonance spectra of BiCoPO5, revealing larger magnetic moments and spectroscopic g factors than expected due to significant orbital contribution for Co2+ ions. A distinctive field-induced magnetic phase transition was observed within the antiferromagnetic ordered phase, with a critical field rising to around 6 T at temperatures much lower than the ordering temperature. Additionally, it was found that the Co moments were not fully polarized at the critical field, supporting the identification of this point as the quantum critical point for the transition to the quantum disordered state in BiCoPO5 at stronger magnetic fields.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
K. Mehlawat, A. Alfonsov, S. Selter, Y. Shemerliuk, S. Aswartham, B. Buechner, V Kataev
Summary: The quasi-two-dimensional antiferromagnet Ni2P2S6 is an important material for realizing fundamental models of quantum magnetism in low dimensions. Through high-frequency/high-magnetic field electron spin resonance measurements, researchers were able to determine the single ion anisotropy of the Ni2+ ions and observe strongly anisotropic spin fluctuations above the Neel temperature. Additionally, a low-energy magnon excitation was discovered, which may explain unusual low temperature relaxation processes observed in recent nuclear magnetic resonance experiments.
Article
Materials Science, Multidisciplinary
Vilmos Kocsis, David A. S. Kaib, Kira Riedl, Sebastian Gass, Paula Lampen-Kelley, David G. Mandrus, Stephen E. Nagler, Nicolas Perez, Kornelius Nielsch, Bernd Buechner, Anja U. B. Wolter, Roser Valenti
Summary: In this combined theoretical and experimental research, the anisotropic magnetic and magnetoelastic properties of the Kitaev material alpha-RuCl3 were investigated. Unusually large magnetostriction anisotropy and non-symmetric magnetic anisotropy were observed, and their origins were explained based on the relative orientation of the magnetization with respect to the crystal structure.
Article
Materials Science, Multidisciplinary
J. Arneth, M. Jonak, S. Spachmann, M. Abdel-Hafiez, Y. O. Kvashnin, R. Klingeler
Summary: In quasi-two-dimensional layered van der Waals material CrI3, the ferromagnetic ordering temperature is studied experimentally to show that compression along the c axis increases intralayer magnetic coupling, while negative in-plane strain decreases it. Interlayer exchange initially increases and subsequently decreases upon the application of both out-of-plane and in-plane compression.
Article
Materials Science, Multidisciplinary
F. Bougamha, S. Selter, Y. Shemerliuk, S. Aswartham, A. Benali, B. Buechner, H-J Grafe, A. P. Dioguardi
Summary: We report the anomalous breakdown in the scaling of the microscopic magnetic susceptibility with the bulk magnetic susceptibility in Mn2P2S6. NMR spectra provide evidence for domain rotation and spin-flop transition in the magnetic state. A spin-flop-induced splitting of the NMR spectra is observed in Ni2P2S6.
Article
Materials Science, Multidisciplinary
Anirudha Ghosh, D. Singh, T. Aramaki, Qingge Mu, V Borisov, Y. Kvashnin, G. Haider, M. Jonak, D. Chareev, S. A. Medvedev, R. Klingeler, M. Mito, E. H. Abdul-Hafidh, J. Vejpravova, M. Kalbac, R. Ahuja, Olle Eriksson, Mahmoud Abdel-Hafiez
Summary: By advanced experimental techniques and theoretical calculations, we have investigated the pressure-temperature phase diagram of CrI3 single crystals and found that pressure can effectively control the magnetic and electrical properties of this material. Pressure reduces the ordering temperature of CrI3 and induces a transition from ferromagnetism to antiferromagnetism, as well as a phase transition from semiconductor to metal.
