A5018985758- Perovskite Materials and Applications
- Solid-state spectroscopy and crystallography
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Inorganic Chemistry and Materials
- Advanced Battery Materials and Technologies
- Advancements in Battery Materials
- 2D Materials and Applications
- Semiconductor materials and interfaces
- Adsorption and biosorption for pollutant removal
- Electrodeposition and Electroless Coatings
- Metal and Thin Film Mechanics
- Quantum Dots Synthesis And Properties
- Phase-change materials and chalcogenides
- Analytical chemistry methods development
- Supercapacitor Materials and Fabrication
- Organic Light-Emitting Diodes Research
- Advanced NMR Techniques and Applications
- Advanced Battery Technologies Research
- Electrostatics and Colloid Interactions
- Organic and Molecular Conductors Research
- Extraction and Separation Processes
Wuhan University
2021-2022
Huawei Technologies (China)
2022
University of St Andrews
2019-2021
Northeast Petroleum University
2014-2016
Fudan University
2016
Shandong Agricultural University
2014-2015
Abstract Hard carbon has the potential to serve as a high‐capacity anode material for sodium‐ion batteries (SIBs), however, its Na + storage mechanism, particularly on low plateau, remains controversial. To overcome this issue, two types of hard carbons with different microstructures are employed and relationship between behaviors is evaluated. By combination operando X‐ray diffraction, ex situ Raman spectroscopy, NMR, theoretical calculation, it found that sodium capacities in plateau...
Perovskite single crystals exhibit extraordinary optoelectronic performances due to their advantages such as low trap-state densities, long carrier diffusion, and large absorption coefficient, thus, photodetectors based on perovskite have attracted much research interest. Unlike the reported one-component single-crystal photodetectors, here, we developed a facile two-step approach fabricate core-shell heterojunction CH3NH3PbBr3 crystal. A photodetector made of as-prepared renders feature...
Hard carbon (HC) has been actively investigated as a high-capacity and low-cost anode material for sodium-ion batteries (SIBs); however, its sodium-storage mechanism remained controversial, which imposes great difficulties in the design construction of better microstructured HC materials. To obtain deeper understanding Na-storage mechanism, we comparatively electrochemical behaviors graphite Na- Li-storage reactions. The experimental results reveal that reaction on at low-potential plateau...
We report the synthesis and properties of a new organic–inorganic hybrid lead perovskite (OIHP), azetidinium bromide (AzPbBr3), possessing 6H structure (space group P63/mmc with = 8.745 Å c 21.329 Å). This compound has band gap 2.81 eV remains stable for >6 months in ambient environment. DFT simulations are fairly good agreement experiments indicate that AzPbBr3 is direct semiconductor. A partial solid solution cubic (3C) methylammonium (Az1–xMAxPbBr3) possible. In Az-rich compositions...
Mixed halide azetidinium lead perovskites AzPbBr3–xXx (X = Cl or I) were obtained by mechanosynthesis. With varying composition from Cl– to Br– I–, the chloride and bromide analogues both form in hexagonal 6H polytype while iodide adopts 9R polytype. An intermediate 4H is observed for mixed Br/I compositions. Overall, structure progresses perovskite with composition. Rietveld refinement of powder X-ray diffraction patterns revealed a linear variation unit cell volume as function average...
The current paper reports successful syntheses of Ni–TiN composite coatings by pulse electrodeposition. effect frequency on the microstructures, nanomechanical, and wear properties was investigated using transmission electron microscopy, X–ray diffraction, nanoindenter, scanning test instrument. results showed that coating prepared at 100 Hz presence a less number TiN particles some degrees aggregation in micro-regions. By contrast, deposited 500 Hz, were large dispersed homogeneously,...
The formation and study of partial solid solutions in Az1–xFAxPbBr3, using reportedly similar-sized cations azetidinium (Az+) formamidinium (FA+), were explored via mechanosynthesis precipitation synthesis. compositions lattice parameters samples from both syntheses analyzed by 1H NMR Rietveld refinement powder X-ray diffraction. A clear mismatch the composition perovskite was found between precipitated corresponding solutions. Such a not observed for obtained mechanosynthesis. discrepancy...
The adsorption capacity of methylene blue (MB) on raw or chemically modified litchi pericarp (LP MLP, respectively) was investigated as a function contact time, pH, and adsorbent dose. isotherms, kinetics, thermodynamic characteristics were also studied using batch assays. optimum MB efficiency LP MLP occurred at time 180 min, pH 6.0–9.0, dosage 2 g/L. Langmuir, Freundlich Dubinin–Radushkevich isotherms pseudo second-order kinetic model satisfactorily fit the equilibrium with high...
Abstract The current paper reports successful syntheses of Ni-TiN composite coatings via pulse (PC) and magnetic PC (MPC) depositions. microstructural, nanomechanical, wear properties mechanism the were investigated scanning electron microscopy (SEM), atomic force (AFM), transmission (TEM), X-ray diffraction (XRD), a nanoindenter (NI) high frequency reciprocating test instrument. results showed that coating deposited at intensity 0.3 T had numerous homogeneously dispersed TiN particles. size...
Lithium deposition on graphite electrode not only reduces fast-charging capability of lithium ion batteries but also causes safety trouble. Here, a low-field 7 Li dynamic nuclear polarization (DNP) is used to probe plating the surfaces three types carbon electrodes: hard carbon, soft and graphite. Owing strong Fermi contact interaction between conduction electrons, nuclear-magnetic-resonance (NMR) signal metal deposited surface could be selectively enhanced by DNP. It suggested that DNP...
Mixed halide azetidinium lead perovskites AzPbBr 3- x X (X = Cl or I) were obtained by mechanosynthesis. With varying composition from Cl- to Br- I-; the chloride and bromide analogs both form in hexagonal 6H polytype while iodide adopts 9R polytype. An intermediate 4H is observed for mixed Br/I compositions. Overall structure progresses perovskite with composition. Rietveld refinement of powder X-ray diffraction patterns revealed a linear variation unit cell volume as function average...
<p>The formation and study of a partial solid solution <a></a><a>Az<sub>1-<i>x</i></sub>FA<i><sub>x</sub></i>PbBr<sub>3</sub></a>, using ‘similar’ sized cations azetidinium (Az<sup>+</sup>) formamidinium (FA<sup>+</sup>), was explored via mechanosynthesis precipitation synthesis. The composition lattice parameters samples from both syntheses were analysed by...
We report inelastic light scattering from underdamped plasmons in azetidinium lead bromide (AzPbBr3). The are very strongly temperature dependent and serve as a soft mode for the semiconductor-insulator phase transition near TC » 150 K, demonstrating continuous decrease hole concentration np(T) by at least factor of four implying nearly tricritical transition. plasmon frequency linewidth agree with independent measurements, impedance analysis reveals dependence (modelled constant element,...
The formation and study of a partial solid solution Az 1- x FA PbBr 3 , using ‘similar’ sized cations azetidinium (Az + ) formamidinium (FA ), was explored via mechanosynthesis precipitation synthesis. composition lattice parameters samples from both syntheses were analysed by 1 H NMR Rietveld refinement the powder X-ray diffraction. A clear mismatch in perovskite found between precipitated corresponding solutions. Such not observed for obtained mechanosynthesis. discrepancy suggests...
A family of Ruddlesden-Popper (n = 1) layered perovskite-related phases, Az2PbClxBr4-x with composition 0 ≤ x 4 were obtained using mechanosynthesis. linear variation in unit cell volume as a function anion average radius is observed. tunable bandgap achieved, ranging from 2.81 to 3.43 eV, and the varies second order polynomial relationship halide composition.
A family of Ruddlesden-Popper (n = 1) layered perovskite-related phases, Az2PbClxBr4-x with composition 0 ≤ x 4 were obtained using mechanosynthesis. These compounds are isostructural K2NiF4 and therefore adopt the idealised n 1 structure. linear variation in unit cell volume as a function anion average radius is observed. tunable bandgap achieved, ranging from 2.81 to 3.43 eV, varies second-order polynomial relationship halide composition.
A family of Ruddlesden-Popper (n = 1) layered perovskite-related phases, Az2PbClxBr4-x with composition 0 ≤ x 4 were obtained using mechanosynthesis. linear variation in unit cell volume as a function anion average radius is observed. tunable bandgap achieved, ranging from 2.81 to 3.43 eV, and the varies second order polynomial relationship halide composition.
<div><div><div><p>Mixed halide azetidinium lead perovskites AzPbBr<sub>3-<i>x</i></sub>X<i><sub>x</sub></i> (X = Cl or I) were obtained by mechanosynthesis. With varying composition from Cl- to Br- I-; the chloride and bromide analogs both form in hexagonal 6H polytype while iodide adopts 9R polytype. An intermediate 4H is observed for mixed Br/I compositions. Overall structure progresses perovskite with composition....