A5037333906- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Advanced battery technologies research
- Electrocatalysts for Energy Conversion
- Conducting polymers and applications
- Organic Light-Emitting Diodes Research
- Supercapacitor Materials and Fabrication
- Catalysis and Hydrodesulfurization Studies
- Electronic and Structural Properties of Oxides
- Advanced Photocatalysis Techniques
- Advanced Sensor and Energy Harvesting Materials
- Fuel Cells and Related Materials
- Biodiesel Production and Applications
- 2D Materials and Applications
- Catalytic Processes in Materials Science
- Advancements in Solid Oxide Fuel Cells
- Lubricants and Their Additives
- Nuclear materials and radiation effects
- Nanopore and Nanochannel Transport Studies
- Advanced Battery Materials and Technologies
- Advancements in Battery Materials
- Microwave Dielectric Ceramics Synthesis
- Optical properties and cooling technologies in crystalline materials
- Ferroelectric and Piezoelectric Materials
- Solar-Powered Water Purification Methods
University College London
2020-2024
Soochow University
2017-2020
Renfe Operadora (Spain)
2019
Universiti Putra Malaysia
2005-2018
Institute of Catalysis and Petrochemistry
2015
Beihang University
2004
Abstract Organometal halide perovskites (OHP) are promising materials for low-cost, high-efficiency light-emitting diodes. In films with a distribution of two-dimensional OHP nanosheets and small three-dimensional nanocrystals, an energy funnel can be realized that concentrates the excitations in highly efficient radiative recombination centers. However, this is likely to contain inefficient pathways as size phase separation between organic phase. Here, we demonstrate crystallite precisely...
The poor stability of CsPbX3 (X = Cl, Br, I) nanocrystals (NCs) has severely impeded their practical applications. Although there are some successful examples on encapsulating multiple NCs into an oxide or polymer matrix, it remained a serious challenge for the surface modification/encapsulation using oxides polymers at single particle level. In this work, monodisperse CsPbX3/SiO2 and CsPbBr3/Ta2O5 Janus nanoparticles were successfully prepared by combining water-triggered transformation...
Recently, all‐inorganic cesium lead halide (CsPbX 3 , X = Cl, Br, I) perovskite nanocrystals have drawn much attention because of their outstanding photophysical properties and potential applications. In this work, a simple efficient solvothermal approach to prepare CsPbX with tunable bright photoluminescent (PL) properties, controllable composition, morphology is presented. nanocubes are successfully prepared emission high PL quantum yield up 80% covering the full visible range narrow line...
All inorganic perovskite nanocrystals (NCs) of CsPbX3 (X = Cl, Br, I, or their mixture) are regarded as promising candidates for high-performance light-emitting diode (LED) owing to high photoluminescence (PL) quantum yield (QY) and easy synthetic process. However, NCs synthesized by the existing methods, where oleic acid (OA) oleylamine (OLA) generally used surface-chelating ligands, suffer from poor stability due ligand loss, which drastically deteriorates PL QY, well dispersibility in...
Fabricating CsPbX3-based heterostructures has proven to be a feasible way tune their photophysical properties. Here, we report the successful fabrication of Janus CsPbX3/ZrO2 heterostructure nanocrystals (NCs), in which each CsPbX3 NC is partially covered by ZrO2. According band alignment, CsPbBr3/ZrO2 and CsPbI3/ZrO2 can indexed as type I II composites, respectively. The composites display great enhancement photoluminescence quantum yield (from 63 90%) lifetime 12.9 66.1 ns) because charge...
Aqueous zinc-ion batteries are promising alternatives to lithium-ion for grid-scale energy storage. However, the practical application of AZIBs is challenged by side reactions and unsatisfactory performance. Electrolyte additives reported that can inhibit on Zn anode enlarge working potential window aqueous electrolytes. Here we propose trace amounts perfluorooctanoic acid (PFOA) facilitate long-term reversible deposition in due perfluorinated n-octyl chains ordered orientation adsorbing...
This research reports the presence of a synergistic effect among vacancies, lattice water and nickel ions on enhancing hydrated protons hopping via Grotthuss mechanism for high performance zinc ion battery cathodes.
Solution-processed perovskite light-emitting diodes (LEDs) have attracted wide attention in the past several years. However, overall efficiency and stability of perovskite-based LEDs remain inferior to those organic or quantum dot LEDs. Nonradiative charge recombination unbalanced injection are two critical factors that limit device operational Here, we develop a strategy modify interface between hole transport layer emissive with an amphiphilic conjugated polymer poly[(9,9-bis(3'-( N,...
Aqueous zinc-ion batteries (AZIBs) have the potential to be utilized in a grid-scale energy storage system owing their high density and cost-effective properties. However, dissolution of cathode materials irreversible extraction preintercalated metal ions electrode restrict stability AZIBs. Herein, cathode-stabilized ZIB strategy is reported based on natural biomass polymer sodium alginate as electrolyte coupling with Na+ δ-Na0.65Mn2O4·1.31H2O cathode. The dissociated after gelation directly...
Abstract Durable and efficient hydrogen evolution reaction (HER) electrocatalysts that can satisfy industrial requirements need to be developed. Platinum (Pt)‐based catalysts represent the benchmark performance but are less studied for HER under high current densities in neutral electrolytes due their cost, poor stability, extra water dissociation step. Here a facile low‐temperature synthesis constructing “blackberry‐shaped” Pt nanocrystals on copper (Cu) foams with low loading as...
Abstract Platinum (Pt) is regarded as a promising electrocatalyst for hydrogen evolution reaction (HER). However, its application in an alkaline medium limited by the activation energy of water dissociation, diffusion H + , and desorption H*. Moreover, formation effective structures with low Pt usage amount still challenge. Herein, guided simulation discovery that edge effect can boost local electric field (LEF) electrocatalysts faster proton diffusion, platinum nanocrystals on transition...
Abstract A stable cathode–electrolyte interface (CEI) is crucial for aqueous zinc‐ion batteries (AZIBs), but it less investigated. Commercial binder poly(vinylidene fluoride) (PVDF) widely used without scrutinizing its suitability and cathode‐electrolyte in AZIBs. water‐soluble developed that facilitated the situ formation of a CEI protecting layer tuning interfacial morphology. By combining polysaccharide sodium alginate (SA) with hydrophobic polytetrafluoroethylene (PTFE), surface...
Abstract The electrochemical synthesis of hydrogen peroxide (H 2 O ) via a two‐electron (2 e − oxygen reduction reaction (ORR) process provides promising alternative to replace the energy‐intensive anthraquinone process. Herein, we develop facile template‐protected strategy synthesize highly active quinone‐rich porous carbon catalyst for H production. optimized PCC 900 material exhibits remarkable activity and selectivity, which onset potential reaches 0.83 V vs. reversible electrode in 0.1...
Abstract Electrochemical hydrogen peroxide (H 2 O ) production (EHPP) via a two-electron oxygen reduction reaction (2e - ORR) provides promising alternative to replace the energy-intensive anthraquinone process. M-N-C electrocatalysts, which consist of atomically dispersed transition metals and nitrogen-doped carbon, have demonstrated considerable EHPP efficiency. However, their full potential, particularly regarding correlation between structural configurations performances in neutral...
Abstract All‐inorganic halide perovskite materials are regarded as promising in information display applications owing to their tunable color, narrow emission peak, and easy processability. However, the photoluminescence (PL) stability of films is still inferior due poor thermal hygroscopic properties. Herein, all‐inorganic prepared through vacuum deposition method enhance stability. By intentionally adding extra bromide source, a structure CsPbBr 3 nanocrystals embedded CsPb 2 Br 5 matrix...
Abstract Recently, hydrovoltaic technology emerged as a novel renewable energy harvesting method, which dramatically extends the capability to harvest water energy. However, urgent issue restricting its device performance is poor carrier transport properties of solid surface if large charged interface considered simultaneously. Herein, based on silicon nanowire arrays (SiNWs), provide surface/volume ratio and excellent properties, yields sustained electricity by concentration gradient...
Abstract A one‐step electrochemical process has been employed to synthesize composite films of polypyrrole/graphene (PPy/GR) by polymerization on indium tin oxide (ITO) from an aqueous solution containing pyrrole monomer, graphene (GO) nanosheets and sodium p ‐toluenesulfonate (NapTS). Thermogravimetric analysis (TGA) confirmed the formation a composite; degradation temperature new hybrid was between those PPy GO. Moreover, bulbous surface almost transparent tissue‐like GO were replaced...
As a promising material, Cs4PbX6 (X = Cl, Br, I) nanocrystals (NCs) have attracted much attention. However, their luminescent property is still under debate. In this work, we first systematically studied the colloidal preparation of NCs. It found that critical parameter for formation NCs ratio between Cs and Pb. Pure are nonluminescent. The luminescence previous reported may come from impurity CsPbX3 No coexistence both phase has been in one single nanoparticle. water-triggered...
Solution-processed perovskite light-emitting diodes (LEDs) possess outstanding optoelectronic properties for potential solid-state display applications. However, poor device stability results in significant efficiency droop partly being ascribed to Joule heating when LEDs are operated at high current densities. Herein, we used monocrystal silicon (c-Si) as the substrate and a charge injection layer alleviate thermal affection LED (PeLED). By incorporating oxide (SiOx)...
Unbalanced charge injection is one of the major issues that hampers efficiency perovskite light-emitting diodes (PeLEDs). Through engineering device structure with multiple hole transport layers (HTLs), i.e., poly(9,9-dioctyl-fluorene-co-N-(4-butylphenyl)diphenylamine) (TFB)/poly(9-vinylcarbazole) (PVK) and nickel oxide (NiOx)/TFB/PVK, efficient PeLED devices have been successfully demonstrated. However, in a typical solution-processed HTLs, underlying conjugated HTL could be easily...
Non-radiative recombination in all-inorganic CsPbBr<sub>3</sub> perovskite films was dramatically reduced upon partial replacement of lead ions with magnesium, leading to efficient and stable light-emitting diodes.