A5026908038- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Advanced Photocatalysis Techniques
- Perovskite Materials and Applications
- 2D Materials and Applications
- Catalytic Processes in Materials Science
- Advanced Memory and Neural Computing
- Semiconductor materials and devices
- Conducting polymers and applications
- Supercapacitor Materials and Fabrication
- ZnO doping and properties
- Fuel Cells and Related Materials
- Electrochemical Analysis and Applications
- Gas Sensing Nanomaterials and Sensors
- Quantum Dots Synthesis And Properties
- Advanced Sensor and Energy Harvesting Materials
- MXene and MAX Phase Materials
- Electronic and Structural Properties of Oxides
- Copper-based nanomaterials and applications
- Chalcogenide Semiconductor Thin Films
- Advanced Battery Technologies Research
- Graphene research and applications
- Ammonia Synthesis and Nitrogen Reduction
Advanced Materials and BioEngineering Research
2023-2025
Trinity College Dublin
2023-2025
Hong Kong Polytechnic University
2003-2024
Royal College of Surgeons in Ireland
2024
Kowloon Hospital
2017-2020
Hong Kong University of Science and Technology
2014-2019
University of Hong Kong
2014-2019
Xiamen University
2017
State Council of the People's Republic of China
2017
Civil Aviation University of China
2016
Tin-based perovskites with excellent optoelectronic properties and suitable band gaps are promising candidates for the preparation of efficient lead-free perovskite solar cells (PSCs). However, it is challenging to prepare highly stable tin-based PSCs because Sn2+ in can be easily oxidized Sn4+ upon air exposure. Here we report fabrication air-stable FASnI3 by introducing hydroxybenzene sulfonic acid or its salt as an antioxidant additive into precursor solution along excess SnCl2 . The...
Work function strongly impacts the surficial charge distribution, especially for metal-support electrocatalysts when a built-in electric field (BEF) is constructed. Therefore, studying correlation between work and BEF crucial understanding intrinsic reaction mechanism. Herein, we present Pt@CoOx electrocatalyst with large difference (ΔΦ) strong BEF, which shows outstanding hydrogen evolution activity in neutral medium 4.5-fold mass higher than 20 % Pt/C. Both experimental theoretical results...
An optimized solid electrolyte interphase is the key to stabilization of microparticle anodes.
Ternary cobalt nickel sulfide as a novel and efficient electrode material in supercapacitors has recently gained extensive interests. Herein, we first report highly conductive caterpillar-like NiCo2S4, composed of NiCo2S4 nanosheet core nanowire shell grown on Ni foam via facile cost-effective chemical liquid process. Growth mechanism the nanosheets@nanowires (NSNWs) structure was also investigated detail by analyzing time-dependent experimental well amount additive ammonium fluoride...
Abstract Owing to their large absorption cross-sections and high photoluminescence quantum yields, lead halide perovskite dots (PQDs) are regarded as a promising candidate for various optoelectronics applications. However, easy degradation of PQDs in water humid environment is critical hindrance Here we develop Pb-S bonding approach synthesize water-resistant perovskite@silica nanodots keeping emission over six weeks. A two-photon whispering-gallery mode laser device made these ultra-stable...
Maintaining the stability of tin halide perovskites is a major challenge in developing lead-free perovskite solar cells (PSCs). Adding extra SnX2 (X = F, Cl, or Br) precursor solution to inhibit Sn2+ oxidation an essential strategy improve device efficiency and stability. However, on surface grains tends prohibit charge transfer across films. Here, we report coadditive engineering approach by introducing antioxidant gallic acid (GA) together with SnCl2 performance tin-based PSCs. The...
Identification of the active species in electrocatalysts toward hydrogen evolution reaction (HER) is great significance for development catalytic industry; however, it still subject considerable controversy. Herein, we applied operando synchrotron X-ray powder diffraction (SXRD) NiSe2 electrocatalyst system, and an situ phase transformation from cubic to hexagonal NiSe was revealed. The showed enhanced activity. Operando Raman spectroscopy verified decomposition during HER. Theoretical...
Sn-Pb mixed perovskites with bandgaps in the range of 1.1-1.4 eV are ideal candidates for single-junction solar cells to approach Shockley-Queisser limit. However, efficiency and stability mixed-perovskite (PSCs) still lag far behind those Pb-based counterparts due easy oxidation Sn2+ . Here, a reducing agent 4-hydrazinobenzoic acid is introduced as an additive along SnF2 suppress Meanwhile, vertical Pb/Sn compositional gradient formed spontaneously after antisolvent treatment different...
Plastic valorization presents a significantly untapped opportunity to address environmental issues while creating the necessary economic push for circular carbon economy. Compared with conventional routes processing plastics (e.g., pyrolysis and gasification), photoreforming strategy, namely, photocatalytic plastic oxidation paired water splitting, aims achieve into commodity chemicals under mild conditions offering hydrogen fuels. Here, we implement MoS2-tipped CdS nanorod photocatalysts in...
Abstract The commercialization of reversible protonic ceramic electrochemical cells is hindered by the lack highly active and durable air electrodes exposed to high concentration steam under operating conditions. Here, findings that dramatically enhance electrocatalytic activity stability a conventional (La 0.6 Sr 0.4 ) 0.95 Co 0.2 Fe 0.8 O 3− δ (LSCF) electrode multiphase catalyst coating composed conformal Pr 1− x Ba CoO thin film exsolved BaCoO nanoparticles, are reported. At 600 °C,...
PtM3 alloys have demonstrated superior oxygen reduction reaction (ORR) activity due to the strong strain effect caused by non-noble metal cores. However, serious corrosion of metals in acid solutions is still challenging. Herein, a hollow porous N-doped carbon sphere-encapsulated PtCo3 intermetallic electrocatalyst (O-PtCo3@HNCS) successfully prepared through Co pre-embedding and subsequent impregnation–reduction method. The step responsible for formation abundant mesopores, process leads...
Abstract Electrocatalytic CO 2 reduction at near-ambient temperatures requires a complex inventory of protons, hydroxyls, carbonate ions and alkali-metal the cathode anode to be managed, necessitating use ion-selective membranes regulate pH. Anion-exchange provide an alkaline environment, allowing low cell voltages suppression hydrogen evolution while maintaining high conversion efficiencies. However, local conditions presence alkali cations lead problematic formation even precipitation....
Metal-organic framework (MOF) solids with their variable functionalities are relevant for energy conversion technologies. However, the development of electroactive and stable MOFs electrocatalysis still faces challenges. Here, a molecularly engineered MOF system featuring 2D coordination network based on mercaptan-metal links (e.g., nickel, as Ni(DMBD)-MOF) is designed. The crystal structure solved from microcrystals by continuous-rotation electron diffraction (cRED) technique. Computational...
Unraveling the catalyst surface structure and behavior during reactions is essential for both mechanistic understanding performance optimization. Here we report a phenomenon of facet-dependent restructuring intrinsic to β-Ni(OH)2 catalysts oxygen evolution reaction (OER), discovered by correlative ex situ operando characterization. The study after OER reveals at edge facets form nanoporous Ni1–xO, which Ni deficient containing Ni3+ species. Operando liquid transmission electron microscopy...
The growing prevalence of counterfeit products worldwide poses serious threats to economic security and human health. Developing advanced anti-counterfeiting materials with physical unclonable functions offers an attractive defense strategy. Here, we report multimodal, dynamic labels based on diamond microparticles containing silicon-vacancy centers. These chaotic are heterogeneously grown silicon substrate by chemical vapor deposition, facilitating low-cost scalable fabrication....
Electrochemical transistors (ECTs) have shown broad applications in bioelectronics and neuromorphic devices due to their high transconductance, low working voltage, versatile device design. To further improve the performance, semiconductor materials with both carrier mobilities large capacitances electrolytes are needed. Here, we demonstrate ECTs based on highly oriented two-dimensional conjugated metal-organic frameworks (2D c-MOFs). The ion-conductive vertical nanopores formed within 2D...
Memristors based on partially oxidised layered semiconductors show sub-nJ resistance switching between several states with no need for electroforming or compliance, making them promising candidates future neuromorphic computing hardware.
Abstract Semiconducting metal oxides (SMOXs) are used widely for gas sensors. However, the effect of ambient humidity on baseline and sensitivity chemiresistors is still a largely unsolved problem, reducing sensor accuracy causing complications calibrations. Presented here general strategy to overcome water‐sensitivity issues by coating SMOXs with hydrophobic polymer separated metal–organic framework (MOF) layer that preserves SMOX surface serves gas‐selective function. Sensor devices using...
The oxygen evolution reaction (OER) is key to renewable energy technologies such as water electrolysis and metal-air batteries. However, the multiple steps associated with proton-coupled electron transfer result in sluggish OER kinetics catalysts are required. Here we demonstrate that a novel nitride, Ni2 Mo3 N, highly active catalyst outperforms benchmark material RuO2 . N exhibits current density of 10 mA cm-2 at nominal overpotential 270 mV 0.1 m KOH outstanding catalytic cyclability...
Abstract The improvement of activity electrocatalysts lies in the increment density active sites or enhancement intrinsic each site. A common strategy to realize dual is use bimetal compound catalysts, where metal atom contributes one In this work, a new concept presented with tunable electron densities monometal catalysts. Dual Co 2+ tetrahedral (Co (T d )) and 3+ octahedral (O h coordination are developed adjustable on ) further achieved by phosphorus incorporation (P‐Co 9 S 8 )....
The electronic structure of NiFe layered double hydroxide was engineered by valence control and intermediate stabilization for enhanced catalytic activity.
Developing highly efficient and low-cost nonprecious electrocatalysts for hydrogen evolution reaction (HER) has a pivotal impact on the emergence of energy. Herein, quaternary electrocatalyst characterized by abundant interfaces supported carbon cloth (denoted as Mo–Co–S–Se/CC) is designed through facile solvothermal post-low-temperature selenylation process, which delivers excellent catalytic performances in HER, oxygen (OER), urea oxidation (UOR) alkaline electrolyte. Benefiting from rich...
Two-dimensional (2D) layered materials have been an exciting frontier for exploring emerging physics at reduced dimensionality, with a variety of exotic properties demonstrated 2D limit. Here, we report the first experimental discovery in-plane antiferroelectricity in material β^{'}-In_{2}Se_{3}, using optical and electron microscopy consolidated by first-principles calculations. Different from conventional 3D antiferroelectricity, β^{'}-In_{2}Se_{3} is confined within layer generates...
Abstract A fundamental limit for the supply voltage of conventional field‐effect transistors is long high‐energy tail Boltzmann distribution carrier population at source junction, which requires a gate least 60 mV to change one decade current. Here 2D semiconductors are adopted as channel materials and hafnium zirconium oxide (HZO) negative capacitance (NC) stack realize low‐power complementary logic inverter. With HZO/Al 2 O 3 NC stack, semiconductor transistor (FET) shows an average...
Abstract Two-dimensional (2D) materials exhibit remarkable mechanical properties, enabling their applications as flexible and stretchable ultrathin devices. As the origin of several extraordinary behaviors, ferroelasticity has also been predicted theoretically in 2D materials, but so far lacks experimental validation investigation. Here, we present demonstration both exfoliated chemical-vapor-deposited β’ -In 2 Se 3 down to few-layer thickness. We identify quantitatively spontaneous strain...