A5030159619- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- 2D Materials and Applications
- Graphene research and applications
- Quantum Dots Synthesis And Properties
- Semiconductor materials and devices
- Supercapacitor Materials and Fabrication
- Electron and X-Ray Spectroscopy Techniques
- Advanced Battery Technologies Research
- Catalytic Processes in Materials Science
- Chalcogenide Semiconductor Thin Films
- ZnO doping and properties
- MXene and MAX Phase Materials
- Graphene and Nanomaterials Applications
- Silicon and Solar Cell Technologies
- Semiconductor materials and interfaces
- Perovskite Materials and Applications
- Advancements in Solid Oxide Fuel Cells
- Machine Learning in Materials Science
- Advanced Electron Microscopy Techniques and Applications
- Extraction and Separation Processes
- Conducting polymers and applications
- Advanced Photocatalysis Techniques
- Advanced battery technologies research
- Carbon dioxide utilization in catalysis
University of Oslo
2022-2025
Chalmers University of Technology
2024
Philipps University of Marburg
2019-2023
Trinity College Dublin
2015-2019
Advanced Materials and BioEngineering Research
2016-2018
Enterprise Ireland
2016-2017
Few layer black phosphorus is a new two-dimensional material which of great interest for applications, mainly in electronics. However, its lack stability severely limits our ability to synthesise and process this material. Here we demonstrate that high-quality, few-layer nanosheets can be produced large quantities by liquid phase exfoliation the solvent N-cyclohexyl-2-pyrrolidone (CHP). We control nanosheet dimensions have developed metrics estimate both size thickness spectroscopically....
Ni-rich layered LiNi1-x-yCoxMnyO2 (NCM, x + y ≤ 0.2) is an intensively studied class of cathode active materials for lithium-ion batteries, offering the advantage high specific capacities. However, their reactivity also one major issues limiting lifetime batteries. NCM degradation, in literature, mostly explained both by disintegration secondary particles (large anisotropic volume changes during lithiation/delithiation) and formation rock-salt like phases at grain surfaces potential with...
In situ TEM heating studies of double γ/β-Ga 2 O 3 polymorph structures revealed γ-to-β transition via the formation β-Ga domains.
Carbon dioxide reduction into useful chemical products is a key technology to address urgent climate and energy challenges. In this study, nanohybrid made by Co3O4 graphene proposed as an efficient electrocatalyst for the selective of CO2 formate at low overpotential. A comparison between samples with different metal oxide carbon ratios or without doping moiety indicates that most active catalyst formed highly dispersed crystalline nanocubes exposing {001} oriented surfaces, whereas nitrogen...
Abstract The layered oxide LiNiO 2 (LNO) has been extensively investigated as a cathode active material for lithium‐ion batteries. Despite LNO's high gravimetric capacity, instability issues hinder its commercialization. It suffers from capacity loss during electrochemical cycling and is difficult to synthesize without defects. This related poor structural stability, leading decomposition into the parent rock‐salt‐type oxide. In order understand such phase transformations develop measures...
The application of nickel-rich LiNixCoyAlzO2 (NCA) cathode materials in solid-state lithium-ion batteries (SSBs) promises significant improvements energy density, stability, and safety over traditional with liquid electrolytes. However, low active mass utilization strong capacity fading associated degradation the often limit SSB applicability. use single-crystalline (CAMs) instead spherical polycrystalline optimized for performance recently emerged as a promising approach field SSBs to...
All solid-state batteries offer the possibility of increased safety at potentially higher energy densities compared to conventional lithium-ion batteries. In an all-ceramic oxide battery, composite cathode consists least one ion-conducting solid electrolyte and active material, which are typically densified by sintering. this study, reaction Li1.3Al0.3Ti1.7(PO4)3 (LATP) material LiNi0.6Co0.2Mn0.2O2 (NCM622) is investigated cosintering temperatures between 550 650 °C. The characterization...
The resurgence of electromobility drives the need for high energy density cathode materials. LiNiO 2 (LNO) meets this demand, based on its specific capacity in a narrow voltage range and without relying scare elements. Yet, it has been plagued by various issues, such as poor cycling performance thermal instability. Adding dopants, widely available Mg 2+ , is common strategy to balance density. Most prior studies focused large content ranges were laboratory X-ray diffraction. Hence, influence...
ZnO–ZrO2 mixed oxide (ZnZrOx) catalysts are widely studied as selective for CO2 hydrogenation into methanol at high-temperature conditions (300–350 °C) that preferred the subsequent in situ zeolite-catalyzed conversion of hydrocarbons a tandem process. Zn, key ingredient these catalysts, is known to volatilize from ZnO under conditions, but little about Zn mobility and volatility oxides. Here, an array ex characterization techniques (scanning electron microscopy/energy dispersive X-ray...
Li-ion all-solid-state batteries (ASSBs) employing solid electrolytes (SEs) can address the energy density and safety issues that plague current state-of-the-art battery (LIB) architecture. To end, intimate physical chemical bonding has to be established between high-performance cathodes high-voltage stable SEs facilitate high Li+ transfer. The production of interfaces in oxide cathode–solid electrolyte composites requires high-temperature (>1000 °C) processing, which results a range...
Abstract Surface restructuring and the formation of amorphous layers during initial stages oxygen evolution reaction (OER) is a common phenomenon in perovskite-based catalysts. It has also been observed that catalysts following lattice mechanism (LOM) are prone to amorphization as rates vacancy replenishment not equal. This accompanied by significant A-site cation loss electrolyte, ultimately leading collapse crystalline phase appearance an catalytic surface thickness around 10 nm....
The oxygen exchange kinetics of BaGd0.3La0.7Co2O6−δ (BGLC37) were investigated with pulsed isotope (PIE) measurements in dry and humid atmospheres the temperature range 400–600°C 0.005-0.21 bar O2. Synchrotron...
Manganese oxide nanosheets were synthesized using liquid-phase exfoliation that achieved suspensions in isopropanol (IPA) with concentrations of up to 0.45 mg ml−1. A study solubility parameters showed the was optimum N,N-dimethylformamide followed by IPA and diethylene glycol. solvent choice due its environmentally friendly nature ease use for further processing. For first time, a hybrid graphene manganese single-step co-exfoliation process. The two-dimensional (2D) 0.5 ml−1 demonstrated...
Laboratory-based X-ray absorption spectroscopy (XAS) and especially near-edge structure (XANES) offers new opportunities in catalyst characterization presents not only an alternative, but also a complementary approach to precious beamtime at synchrotron facilities. We successfully designed laboratory-based setup for performing operando, quasi-simultaneous XANES analysis multiple K-edges, more specifically, operando of mono-, bi-, trimetallic CO2 hydrogenation catalysts containing Ni, Fe, Cu....
A highly crystalline ZnO nano pencils/rods were successfully synthesized via low cost and template free solvothermal method. The reaction was carried out at 200 C for 2, 5 12 h respectively. time enhances the photoluminescent properties of ZnO, mainly intensity green emission band increased. X-ray diffraction revealed formed products have a wurtzite structure. morphology microstructure analyses performed by field scanning electron microscopy transmission microscopy. nanorods are about 20 to...
Abstract In this work, lithium titanate nanoparticles (nLTO)/single wall carbon nanotubes (SWCNT) composite electrodes are prepared by the combination of an ultrasound irradiation and ultrasonic spray deposition methods. It was found that a mass fraction 15% optimizes electrochemical performance nLTO electrodes. These present capacities as high 173, 130, 110 70 mAh.g −1 at 0.1C, 1C, 10C 100C, respectively. Moreover, after 1000 cycles nLTO/SWCNT composites capacity loss just 9% Coulombic...
The thermal stability of cathode active materials (CAMs) is major importance for the safety lithium-ion batteries (LIBs). A thorough understanding how commercially viable layered oxide CAMs behave at atomic length scale upon heating indispensable further development LIBs. Here, structural changes Li(Ni0.85Co0.15Mn0.05)O2 (NCM851005) elevated temperatures are studied by in situ aberration-corrected scanning transmission electron microscopy (AC-STEM). Heating NCM851005 inside microscope under...
In lithium ion batteries (LIBs), the layered cathode materials of composition LiNi1-x-y Cox Mny O2 are critical for achieving high energy densities. A nickel content (>80%) provides an attractive balance between density, long lifetime, and low cost. Consequently, Ni-rich oxides active (CAMs) in demand, importance LiNiO2 (LNO) as limiting case, is hence paramount. However, perfect stoichiometry a challenge resulting various structural issues, which successively impact physicochemical...