Wei Li

Wei Li
The University of Edinburgh | UoE · School of Engineering

BEng, PhD

About

44
Publications
3,454
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Introduction
Wei Li currently works at the Department of Chemical Engineering and Applied Chemistry, Aston University. Wei does research in Materials Science, Catalysis and Electrochemistry. Their most recent publication is 'TiO2 Nanofoam-Nanotube Array for Surface-Enhanced Raman Scattering'.

Publications

Publications (44)
Article
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The use of semiconductors as photoelectrochemical electrodes and photocatalysts were studied extensively over the last few decades, but it is challenging that one single material meets a wide range of...
Article
Full-text available
Methane's contribution to radiative forcing is second only to that of CO2. Though previously neglected, methane is now gaining increasing public attention as a GHG. At the recent COP26 in Glasgow, 105 countries signed “the methane pledge” committing to a 30% reduction in emissions from oil and gas by 2030 compared to 2020 levels. Removal methods ar...
Article
A surfactant-free, low temperature hydrothermal synthesis of Cu2O nanostructures is demonstrated for application to the photocatalytic degradation of trimethoprim (TMP), an environmental xenobiotic. Photophysical properties of different size and shape Cu2O nanostructures were determined by bulk and surface microscopic and spectroscopic analyses. Vi...
Article
Full-text available
Due to the alarming speed of global warming, greenhouse gas removal from atmosphere will be absolutely necessary in the coming decades. Methane is the second most harmful greenhouse gas in the atmosphere. There is an emerging technology proposed to incorporating photocatalysis with solar updraft Towers (SUT) to remove methane from the air at a plan...
Article
Methane (CH4) is the second largest contributor to global warming among all greenhouses gases. A solar chimney power plant integrated with a photocatalytic reactor (SCPP-PCR) is a promising large-scale method for removing CH4 from the atmosphere. This study used computational fluid dynamics (CFD) to investigate the performance and factors influenci...
Article
We report a simple strategy for providing a homogenous TiO2 nanofibre host environment to stabilize Cu2O nanoparticles with an average size of ∼60 nm and high dispersibility. We found that the small fraction of Cu2O nanoparticles in direct contact/partially submerged with TiO2 nanofibre arrays (diameter ∼300 nm and length ∼650 nm) showed excellent...
Article
Full-text available
Bismuth vanadate (BiVO4) is a widely studied photocatalyst for the depollution of contaminated wastewater, production of hydrogen by water splitting, and organic synthesis. The photophysical properties of BiVO4 are sensitive to morphology and quantum confinement effects, and can exhibit enhanced photocatalytic performance in nanocomposites with gra...
Article
Hierarchical Cu2O nanospheres with a Pompon Dahlia‐like morphology were prepared by a one‐pot synthesis employing electrostatic self‐assembly. Nanocomposite analogues were also prepared in the presence of reduced graphene oxide (rGO). Photophysical properties of the hierarchical Cu2O nanospheres and Cu2O/rGO nanocomposite were determined, and their...
Article
Structural control and element doping are two popular strategies to produce semiconductors with surface enhanced Raman spectroscopy (SERS) properties. For TiO2 based SERS substrates, maintaining a good crystallinity is critical to achieve excellent Raman scattering. At elevated temperatures (> 600 °C), the phase transition from anatase to rutile Ti...
Article
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Solar photocatalytic processes are a promising approach to environmental remediation, however their implementation requires improvements in visible light harvesting and conversion and a focus on low cost, Earth abundant materials. Semiconducting copper oxides are promising visible light photocatalysts for solar fuels and wastewater depollution. Her...
Chapter
This chapter focuses on recent progress in nanoparticle design and synthesis for selective conventional catalytic, photocatalytic, electrocatalytic, photoelectrocatalytic and photothermal catalytic conversions of CO2 to reusable low carbon-based products, such as carbon monoxide, methane, methanol, formic acid, ethylene and many more, as sustainabl...
Article
The design of topographically patterned surfaces is considered to be a preferable approach to influence cellular behavior in a controllable manner, in particular to improve the osteogenic ability in bone regeneration. In the present study, we fabricated nanolamellar tantalum (Ta) surfaces with lamella wall thicknesses of 40 nm and 70 nm. The cells...
Article
By tuning the anodic voltage and the electrochemical reaction time, we have synthesized a serial of TiO2 nanofoam-nanotube array structures via a two-step anodic oxidation process. The produced nanofoam-nanotube array demonstrated a remarkable Raman scattering enhancement. The maximum enhancement factors are 2.3×105 for methylene blue. Factors such...
Article
Semiconducting quantum dots (QDs) have been considered as promising building blocks of solar energy harvesting systems because of size-dependent electronic structure, e.g. QD−metal heterostructures for solar-driven H2 production. In order to design improved systems, it is crucial to understand size dependent QD−metal interfacial electron transfer d...
Article
Partial deposition of carbon onto mesoporous TiO2 (C/TiO2) were prepared as supporting substrate for Pt catalyst development. Carbon deposition is achieved by in-situ carbonization of furfuryl alcohol. The hybrid catalysts were characterized by XRD, Raman, SEM and TEM and exhibited outstanding catalytic activity and stability in methanol oxidation...
Article
Full-text available
Colloidal cadmium chalcogenide nanocrystals are usually stabilized in polar solvents by functionalizing the surface with a layer of hydrophilic ligands. While these ligands protect against aggregation, they also present a steric barrier that hinders surface access. In applications that require charge transfer to and from nanocrystals, colloidal sta...
Article
The performance of solar-thermal conversion systems can be improved by incorporation of nanocarbon-stabilized microencapsulated phase change materials (MPCMs). The geometry of MPCMs in the microcapsules plays an important role for improving their heating efficiency and reliability. Yet few efforts have been made to critically examine the formation...
Article
Colloidal stability and efficient interfacial charge transfer in semiconductor nanocrystals are of great importance for photocatalytic applications in aqueous solution since they provide long-term functionality and high photocatalytic activity, respectively. However, colloidal stability and interfacial charge transfer efficiency are difficult to op...
Article
We report that the internal quantum efficiency for hydrogen generation in spherical, Pt-decorated CdS nanocrystals can be tuned by quantum confinement, resulting in higher efficiencies for smaller than for larger nanocrystals (17.3% for 2.8 nm and 11.4% for 4.6 nm diameter nanocrystals). We attribute this to a larger driving force for electron and...
Article
Mesoporous TiO2-B/anatase microparticles have been in-situ synthesized from K2Ti2O5 without template. The TiO2-B phase around the particle surface accelerates the diffusion of charges through the interface, while the anatase phase in the core maintains the capacity stability. The heterojunction interface between main polymorph of anatase and trace...
Article
Pyrite nanocrystals are currently considered as a promising material for large scale photovoltaic applications due to their non-toxicity and large abundance. While scalable synthetic routes for phase-pure and shape controlled colloidal pyrite nanocrystals have been reported, their use in solar cells has been hampered by the detrimental effects of t...
Article
Efforts are being made to improve crystalline properties of the skeletons of mesoporous TiO2. On the basis of the unique crystal structures and versatile phase evolution of K2Ti2O5, we obtain mesoporous TiO2(B) nanofibers (M-NFs) with highly crystalline and high-energy facets exposed skeletons via a cheap and scalable route. Verified by X-ray diffr...
Article
Carbon-coated TiO2 fibers were synthesized as core–shell structured supports for highly dispersed Ptnanoparticles. The catalyst samples were characterized by XRD, Raman, TGA, SEM, TEM and EDX. Performance of methanol oxidation was evaluated in aqueous H2SO4 solutions with methanol by cyclic voltammetry and chronoamperometry. The TiO2 nanofibers wer...
Article
Nanocrystals from non-toxic, earth abundant materials have recently received great interest for their potential large-scale application in photovoltaics and photocatalysis. Here, we report for the first time on the shape-controlled and scalable synthesis of phase-pure pyrite (FeS2) nanocrystals employing the simple, inexpensive, thermal reaction of...
Article
Single-crystalline anatase TiO2 nanofibers with highly reactive {001} facets were synthesized from layered potassium titanate K2Ti2O5via topotactic transformation in ion-exchange and dehydration. The cuboid fibers showed one-dimensional (1-D) orientation in the [010] direction and {001} as well as {100} facets enclosing along the longitudinal dimen...
Article
Highly thermally stable anatase TiO2 whisker has been synthesized by ion-exchange and calcination at high temperature (800°C) using K2Ti2O5 as the precursor. Pt nanoparticles (1%) were loaded on this TiO2 to prepare a Pt/TiO2 catalyst by the glycol-colloidal method. The catalyst samples were characterized by X-ray diffraction, scanning electron mic...
Article
By means of density functional theory (DFT) calculations, we study the water adsorption behavior on two common surfaces, (001) and (100) TiO(2)-B, which maintains the monoclinic structure as high as approximately 550 degrees C or higher in ambient conditions. The two surfaces show totally different activity for water dissociation. The dissociative...
Article
A scale-up model for photoreactors based on a comparative study of the photocatalytic efficiency of suspended and immobilized systems was developed. The model is independent of reactor size and configurations, and it assumes that photocatalytic efficiency is the same when normalized per unit of illuminated catalyst area in both systems. In all case...
Article
The mesoporous titania with TiO2(B) (mt-TiO2(B)), which has a lattice-matched core-shell crystalline structure with a thin TiO2(B) phase sheathing an anatase core, was synthesized from potassium titanate (K2Ti2O5) by hydration, ion exchange, and calcination. TiO2(B) is a crystalline form of titania with a looser structure than anatase and rutile. I...
Article
There is a growing demand for the efficient treatment of organic polluted wastewaters by advanced oxidation processes (AOPs) which calls for the determination of the mineralization order of ease for the organic contaminants with oxidants. The mineralization abilities of organic contaminants in AOPs are investigated in this work. Photocatalytic expe...
Article
A novel metal–semiconductor nanocomposite with stable metal nanoparticles and efficient photocatalytic performance has been prepared. It consists of highly dispersed 2 nm platinum (Pt) nanoparticles loaded on mesoporous and bicrystalline TiO2 fibers (Pt/mb-TiO2). Due to the well organized porous Pt/TiO2 nanoarchitecture, rate of photodegradation of...
Article
We report an effective approach to fabricate nanopatterns of alkylsilane self-assembly monolayers (SAMs) with desirable coverage and feature size by gradient photocatalysis in TiO2 aqueous suspension. Growth and photocatalytic degradation of octadecyltrichlorosilane (OTS) were combined to fabricate adjustable monolayered nanopatterns on mica sheet...
Article
In the absence of any doping and modification, the anatase-to-rutile phase transformation was inhibited at high temperatures giving rise to highly thermal stable and highly crystalline anatase TiO2 fibers. The initial formation of the TiO2(B) phase is found to be key in inhibiting this transformation. The intermediate structure of the TiO2 fiber co...
Article
Mesoporous TiO2 was synthesized by hydrothermal treatment of titanic acid hydrate (H2Ti2O5·xH2O) from potassium titanate (K2Ti2O5) via ion-exchange and glucose in aqueous solution at 220 , followed by a posttreatment in the presence of air at 520 . The photocatalyst was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), N...
Article
A bicrystalline titanium dioxide nanofiber with enhanced photocatalytic activity was synthesized from potassium titanate K2Ti2O5 via ion exchange and calcination. The nanofiber has a core−shell crystalline structure with a thin TiO2(B) phase sheathing the anatase core, as characterized by X-ray diffraction, Raman spectroscopy, and high-resolution t...
Article
Mesoporous TiO2 whisker was loaded with gold (denoted as Au/T(t), t represents the calcination temperature of support) by deposition-precipitation with urea (DPU) and then used in low-temperature CO oxidation. Disparate morphologies were obtained for the gold deposited on different TiO2 whisker samples while the particle sizes were in a similar ran...
Article
The sol-gel method was used to prepare potassium hexatitanate and titania thin films on indium-tin oxide (ITO) substrate by dip-coating. With this method, the connection between K2Ti6O13 film and ITO glass substrate was strong and maintained a good electrical contact. Electrochemical method combined with ultraviolet-visible light absorption spectro...
Article
A method for the inhibition of photocatalytic activity of the titania whiskers was reported in the paper. The stability and dispersion behavior of the passivated titania whiskers were studied. The results show that the photocatalytic activity of the passivated titania whiskers is only 10% of fresh titania whiskers, and the stability and dispersion...
Article
The reason of deactivation of titania whiskers used for deep purification of drinking water and the corresponding regeneration methods were presented. AFM, XRD and ICP were carried out to characterize the titanium dioxide. The experimental results suggest that the main reason of deactivation of titania whiskers is the deposition of calcium carbonat...
Article
Photocatalytic oxidation is a promising technique for drinking water treatment, but is still in the phase of laboratory or small scale test at the moment. The inadequacy of the data of organics photodegradation at trace concentration and the difficulty in detecting trace organics are two outstanding problems. In this work, the clustering analysis m...
Article
An approach was developed to investigate hole oxidation on TiO2 films in aqueous solutions by using octadecyltrichlorosilane (OTS) self-assembled monolayers (SAMs) as a probe, in which the adsorption and surface diffusion of the reactants were exculded. Under UV irradiation, the water contact angle of the OTS SAMs on TiO2 films in water decreased o...
Article
The influences of the backmixing degree in photocatalytic reactors and the decay of radiant energy on the enlarged design of the photoreactor were studied. The results show that the distance between the lamp and the interface irradiated by UV light is required to be less than 10 cm since the radiant energy decreases remarkably with the distance in...