A5039749432- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Supercapacitor Materials and Fabrication
- Extraction and Separation Processes
- Advanced Battery Technologies Research
- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Fuel Cells and Related Materials
- Advanced battery technologies research
- Orbital Angular Momentum in Optics
- Layered Double Hydroxides Synthesis and Applications
- Ammonia Synthesis and Nitrogen Reduction
- Nonlinear Optical Materials Studies
- Spectroscopy Techniques in Biomedical and Chemical Research
- Thermography and Photoacoustic Techniques
- Hydrogen Storage and Materials
- Semiconductor materials and interfaces
- Advanced Memory and Neural Computing
- Electrocatalysts for Energy Conversion
- Polyoxometalates: Synthesis and Applications
- Ionic liquids properties and applications
- Advanced Fluorescence Microscopy Techniques
- Near-Field Optical Microscopy
- Photochemistry and Electron Transfer Studies
- Metallurgical and Alloy Processes
Helmholtz-Institute Ulm
2021-2024
Karlsruhe Institute of Technology
2023
S.N. Bose National Centre for Basic Sciences
2021
Indian Institute of Technology Kanpur
2014-2019
Abstract The development of competitive rechargeable Mg batteries is hindered by the poor mobility divalent ions in cathode host materials. In this work, we explore dual cation co-intercalation strategy to mitigate sluggishness 2+ model TiS 2 material. involves pairing with Li + or Na dual-salt electrolytes order exploit faster latter aim reach better electrochemical performance. A combination experiments and theoretical calculations details charge storage redox mechanism co-intercalating...
Multivalent batteries show promising prospects for next-generation sustainable energy storage applications. Herein, we report a polytriphenylamine (PTPAn) composite cathode capable of highly reversible tetrakis(hexafluoroisopropyloxy) borate [B(hfip)
Layered oxides constitute one of the most promising cathode materials classes for large-scale sodium-ion batteries because their high specific capacity, scalable synthesis, and low cost. However, practical use is limited by energy density, physicochemical instability, poor cycling stability. Aiming to mitigate these shortcomings, in this work, we synthesized polycrystalline (PC) single-crystal (SC) P2-type Na0.67-δMn0.67Ni0.33O2 (NMNO) through a solid-state route evaluated electrochemical...
Magnesium (Mg) metal batteries exhibit great potential as energy storage systems beyond lithium, owing to their inherent safety, material sustainability, and low cost. However, development is hindered by the lack of a suitable electrolyte enabling reversible Mg deposition dissolution. When combined with sulfur (S) cathode, formation magnesium polysulfide intermediates further restricts cycling stability sulfur-based batteries. In this study, flexible Mg-based gel polymer designed address...
Abstract The advancement of microelectronic devices mandates the development flexible energy storage systems to enable fabrication miniaturized and wearable electronics. Herein, a sustainable approach is demonstrated for tuning electronic electrochemical properties hierarchically porous laser‐induced graphene (LIG) substrates. methodology entails deposition polyoxovanadate nanoclusters (K 5 (CH 3 CN) [V 12 O 32 Cl] (= K {V }) onto highly LIG matrix. comprehensive characterization integrated...
Recent studies have shown that disordered rock salt (DRS) oxyfluorides with Li excess are interesting candidates as cathode materials for Li-ion batteries. However, these not been able to achieve the desired technological level yet owing structure stability issues and lack of direct evidence underlying Li+ (de)insertion mechanism. In this work, we demonstrate how fluorine can increase DRS improve lithium diffusion in a percolation network concomitant accommodated structural Mn oxidation....
Abstract Upon cycling, Li‐rich Mn‐based disordered rocksalt (DRS) oxyfluoride cathode materials undergo unwanted degradation processes, which are triggered by chemical side reactions or irreversible oxygen redox activity, especially at high voltages and in contact with the electrolyte. A surface coating can be an effective strategy to mitigate these parasitic reactions. However, oxyfluorides generally experience limited stability, makes application of coatings requiring temperatures...
Abstract A prime challenge in the development of new battery chemistries is fundamental understanding generation electrode–electrolyte interface (EEI) and its evolution upon cycling. Tip‐enhanced Raman spectroscopy (TERS) under an inert gas atmosphere employed to study chemical components anode/cathode electrolyte a sodium‐ion battery. After first cycle, TERS reveals that EEI mostly consists organic carbonate/dicarbonate, oligoethylene oxides, α,β‐unsaturated vinyl ketones/acetates,...
We use a femtosecond pump–probe Z-scan technique to measure the thermal lens (TL) signal in homologous series of primary alcohols.
Using the close-aperture Z-scan technique, pure nonlinear refractive index (n2) of carbon disulfide is measured with a 76 MHz repetition rate femtosecond laser. Strong interference thermal effects exists high-repetition-rate lasers that result in negative values n2. We remove effect completely by continuously increasing sample flow (F) cell as indicated change sign n2 from to positive. The positive value due Kerr-type nonlinearity. At sufficiently high F >25 ml/min, all are removed,...
We have shown experimentally the successful engineering of femtosecond pulse shaping at a 76 MHz repetition rate input with an acousto-optic modulator (AOM). High (HRR) laser using AOM in Fourier plane was incomprehensible because its intrinsic 100 kHz acoustic update limit. demonstrate effective way selection and calibration routine (Fourier shift theorem), which enables generation ∼10 MHz shaped output pulses from HRR train. generated temporally shifted rectangular profile by applying...
Abstract In aqueous magnesium air batteries, the influence of electrochemical behavior on pH electrolyte has not been investigated yet, which a critical effect cell performance. We have monitored evolution at various discharge current densities in situ Mg‐air primary cells, produce sparingly soluble hydroxide (Mg(OH) 2 ). These experiments show temporal discharge, depending density. The first increases rapidly to maximum 11 and then drops down slowly equilibrium 10.7. At peak oversaturation...
Abstract The development of commercially viable fuel cells and metal‐air batteries requires effective cheap bifunctional catalysts for the oxygen reduction reaction (ORR) evolution (OER). Multi‐component Pt−Fe−Co−Ni nanoparticles on multi‐walled carbon nanotubes (MWCNTs) were synthesized by wet chemistry route via NaBH 4 metal salts, followed sintering at different temperatures. catalyst demonstrates an excellent ORR activity a promising OER in 0.1 m KOH, with bi‐functional over‐potential,...
We illustrate control of a polarized laser optical trapping potential landscape through the nonideal mixing binary liquids. The inherent asymmetry (ITPA) present in region results from asymmetric intensity distribution focal volume due to high numerical aperture objective lens. Experimentally, we show that this ITPA effect can be modified and/or removed by use liquid mixtures. From our femtosecond tweezers experiments, determine topograph base on fluctuation-dissipation theorem....
Abstract Multivalente Batterien sind sehr vielversprechend für nachhaltige Energiespeicheranwendungen der nächsten Generation. Hier berichten wir über eine Polytriphenylamin (PTPAn)‐Verbundkathode, die in Lage ist, Tetrakis(hexafluorisopropyloxy)borat [B(hfip) 4 ] − Anionen sowohl Magnesium‐ (Mg) als auch Calcium‐ (Ca) Batteriesystemen hochreversibel zu speichern. Spektroskopische und Computerstudien zeigen den Redoxreaktionsmechanismus des PTPAn‐Kathodenmaterials. Die Mg‐ Ca‐Zellen weisen...
We have observed two photon fluorescence resonance energy transfer (FRET) from optically trapped bead coated with multiple dyes. The obtained particles is useful to measure biomechanical property of that confined system.
Inorganic aqueous binders (IAB) are an emerging class of binders. They offer exceptional physicochemical properties like intrinsic ionic conductivity, high thermal stability (>1000°C), and environmental benignity making them attractive. In a previous study, we found that graphite anode shows improved electrochemical performance with these as compared to conventional PVDF binder for lithium-ion batteries (LIB). However, the cyclic graphite-IAB at higher rate (e.g., 1C) showed declining...
Electrically conducting graphitic carbon materials are ubiquitous constituents of electrocatalysts and electrochemical energy storage materials. During electrolysis charge-discharge cycles the matrix is subjected to chemical stress due drastic changes in redox environment, formation reactive intermediate species steric strain caused by intercalation counter ions. These factors trigger defects lattice, leading scattering charge carriers, thereby reducing carrier mobility. It outmost...