A5039378901- Layered Double Hydroxides Synthesis and Applications
- Inorganic Chemistry and Materials
- Advancements in Battery Materials
- Magnesium Oxide Properties and Applications
- Advanced Battery Materials and Technologies
- Conducting polymers and applications
- Iron-based superconductors research
- Supercapacitor Materials and Fabrication
- Transition Metal Oxide Nanomaterials
- Chemical Synthesis and Characterization
- Solid-state spectroscopy and crystallography
- Crystal Structures and Properties
- Electrocatalysts for Energy Conversion
- Metal-Organic Frameworks: Synthesis and Applications
- Polyoxometalates: Synthesis and Applications
- Advanced Battery Technologies Research
- Advanced NMR Techniques and Applications
- Fuel Cells and Related Materials
- Electron and X-Ray Spectroscopy Techniques
- Advanced Condensed Matter Physics
- Photovoltaic System Optimization Techniques
- Catalysis and Oxidation Reactions
- Catalysis and Hydrodesulfurization Studies
- Extraction and Separation Processes
- Hydrogen Storage and Materials
Diamond Light Source
2020-2024
MIT University
2023
RMIT University
2023
UNSW Sydney
2023
Universidad del Noreste
2023
Deakin University
2023
Didcot Community Hospital
2021
University of Cambridge
2014-2020
Energy Storage Systems (United States)
2019
Saveetha University
2013
Vanadium sulfide VS4 in the patronite mineral structure is a linear chain compound comprising vanadium atoms coordinated by disulfide anions [S2](2-). (51)V NMR shows that material, despite having V formally d(1) configuration, diamagnetic, suggesting potential dimerization through metal-metal bonding associated with Peierls distortion of chains. This supported density functional calculations, and also consistent observed alternation V-V distances 2.8 3.2 Å along Partial lithiation results...
The high theoretical gravimetric capacity of the Li-S battery system makes it an attractive candidate for numerous energy storage applications. In practice, cell performance is plagued by low practical and poor cycling. effort to explore mechanism discharge with goal better understanding performance, we examine phase diagram using computational techniques complement this in situ (7)Li NMR study during discharge. Both experimental studies are consistent suggestion that only solid product...
Producing green hydrogen in a cost-competitive manner via water electrolysis will make the long-held dream of economy reality. Although platinum (Pt)-based catalysts show good performance toward evolution reaction (HER), high cost and scarce abundance challenge their economic viability sustainability. Here, non-Pt, high-performance electrocatalyst for HER achieved by engineering fractions stacking fault (SF) defects MoNi
For magnesium ion batteries (MIBs) to be used commercially, new cathodes must developed that show stable reversible Mg intercalation. VS4 is one such promising material, with vanadium and disulfide anions [S2]2– forming one-dimensional linear chains, a large interchain spacing (5.83 Å) enabling insertion. However, little known about the details of redox processes structural transformations occur upon intercalation deintercalation. Here, employing suite local structure characterization...
A detailed study into the electric double-layer capacitance of conductive metal–organic framework Cu<sub>3</sub>(HHTP)<sub>2</sub> reveals new insights capacitive behaviour this family materials.
Synthesizing highly crystalline nano-sized ε-VOPO<sub>4</sub> particles is the key to achieve theoretical capacity of 2 Li<sup>+</sup> intercalation in lithium-ion batteries.
The [LiAl(2)(OH)(6)](+) layer obtained from gibbsite-Al(OH)(3) belongs to the group symmetry P-312/m. This satisfies defining characteristics of a synthon in that it predicts all polymorphic modifications layered double hydroxides Li and Al. various possible ways stacking these layers can be derived by systematic elimination principal elements comprising group. approach yields complete universe structures. When 3 axis is conserved stacking, resultant crystal adopts structure 1H, 2H, or 3R...
In the pursuit of high-capacity electrochemical energy storage, a promising domain research involves conversion reaction schemes, wherein electrode materials are fully transformed during charge and discharge. There are, however, numerous difficulties in realizing theoretical capacity high rate capability many schemes. Here we employ operando studies to understand material FeS2, focusing on local structure evolution this relatively reversible material. X-ray absorption spectroscopy, pair...
The double hydroxides of Li with Al, obtained by the imbibition salts into bayerite and gibbsite-Al(OH)(3), are not different polytypes same symmetry but actually crystallize in two symmetries. bayerite-derived monoclinic symmetry, while gibbsite-derived hexagonal symmetry. Successive metal hydroxide layers LDHs translated vector ( approximately -1/3, 0, 1) respect to each other. exigency hydrogen bonding drives intercalated Cl(-) ion a site 2-fold coordination, whereas water occupies 6-fold...
Abstract Vanadyl phosphates comprise a class of multielectron cathode materials capable cycling two Li + , about 1.66 Na and some K ions per redox center. In this review, structures, thermodynamic stabilities, ion diffusion kinetics various A x VOPO 4 (A = Li, Na, K, NH ) polymorphs are discussed. Both the experimental data first‐principle calculations indicate kinetic limitations for alkali metal cycling, especially between 0 ≤ 1, metastability phases with > 1. This creates challenges...
ε-LiVOPO4, a multi-electron cathode material for Li-ion batteries, suffers from structural disorder upon nanosizing by high-energy ball-milling, which impedes kinetics and promotes undesirable interfacial side reactions. This work presents feasible way to decrease the in ball-milled composite of ε-LiVOPO4/C post-annealing at 450 °C an Ar atmosphere, with no reduction reaction caused carbon particle growth. The post-annealed shows recovered voltage plateaus, enhanced Li diffusivity,...
ε-LiVOPO4 is a promising multielectron cathode material for Li-ion batteries that can accommodate two electrons per vanadium, leading to higher energy densities. However, poor electronic conductivity and low lithium ion diffusivity currently result in rate capability cycle life. To enhance the electrochemical performance of ε-LiVOPO4, this work, we optimized its solid-state synthesis route using situ synchrotron X-ray diffraction applied combination high-energy ball-milling with...
The carbonate containing layered double hydroxide (LDH) of Li with Al having the formula [LiAl2(OH)6](CO3)0.5·1.5H2O crystallizes in monoclinic system. single cell belongs to 1M polytype. However, crystallites are extensively faulted. structural disorder is on account incorporation stacking faults. faults cause nonuniform broadening peaks due hkl reflections powder X-ray diffraction pattern. Using DIFFaX simulations, we compare local structure different theoretically possible polytypes...
Incorporation of Zn(2+) into bayerite results in the formation a cation-ordered layered double hydroxide (LDH) monoclinic symmetry which about half vacancies Al(OH)(3) are occupied by giving rise to positively charged layers. Charge compensation takes place incorporation sulfate ions interlayer region. Structure refinement reveals that adjacent layers crystal related 2(1) axis (we call it 2M(1) polytype) with coordinating D(2d) Another polytype 2-fold (2M(2) can also be envisaged. Faulted...
The properties of mixed ionic–electronic conductors (MIECs) are most conveniently controlled through site-specific aliovalent substitution, yet few techniques can report directly on the local structure and defect chemistry underpinning changes in ionic electronic conductivity. In this work, we perform high-resolution 17O (I = 5/2) solid-state NMR spectroscopy La2–xSrxNiO4+δ, an MIEC prospective solid oxide fuel cell (SOFC) cathode material, showing sensitivity hyperfine (Fermi contact)...
Solid-state NMR combined with DFT calculations are used to characterise metastable phases formed during (electro)chemical lithiation of β-(Li)VOPO<sub>4</sub>.
The first known solid-state <sup>33</sup>S NMR spectrum of disulfide (S<sub>2</sub><sup>2−</sup>) anions is reported, in the Li-ion battery conversion material NbS<sub>3</sub>.
In this paper we have discussed with the maximum power point track of fuel cell system using intelligent controller. We investigated in different types MPPT method and its performance then finalized fuzzy logic based for system. This been analysis PEM electrical characteristics respect to flow rate. The proposed has modelled Matlab Simulink software at various conditions under control optimal usage. resulting waveforms evaluated prove effectiveness