A5017109982- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Electrocatalysts for Energy Conversion
- Nanoplatforms for cancer theranostics
- Advanced battery technologies research
- Perovskite Materials and Applications
- CO2 Reduction Techniques and Catalysts
- Luminescence and Fluorescent Materials
- Supercapacitor Materials and Fabrication
- Advancements in Battery Materials
- Graphene research and applications
- Advanced Photocatalysis Techniques
- Fuel Cells and Related Materials
- Ionic liquids properties and applications
- Quantum Dots Synthesis And Properties
- Carbon dioxide utilization in catalysis
- Copper-based nanomaterials and applications
- Molecular Junctions and Nanostructures
- Photoacoustic and Ultrasonic Imaging
- Advanced Battery Materials and Technologies
- Nanoparticle-Based Drug Delivery
- Thin-Film Transistor Technologies
- Advanced biosensing and bioanalysis techniques
- Advanced Nanomaterials in Catalysis
- Organic Light-Emitting Diodes Research
Southern University of Science and Technology
2016-2025
University of North Carolina at Chapel Hill
2018
University Town of Shenzhen
2016
Tsinghua University
2016
Sungkyunkwan University
2015
North University of China
2015
Stanford University
2000-2014
University of Chicago
2006-2012
Argonne National Laboratory
2009-2010
Northwestern University
2009-2010
Advanced materials for electrocatalytic and photoelectrochemical water splitting are central to the area of renewable energy. In this work, we developed a selective solvothermal synthesis MoS(2) nanoparticles on reduced graphene oxide (RGO) sheets suspended in solution. The resulting MoS(2)/RGO hybrid material possessed nanoscopic few-layer structures with an abundance exposed edges stacked onto graphene, strong contrast large aggregated particles grown freely solution without GO. exhibited...
The photovoltaic performance of polymer bulk heterojunction solar cells is studied systematically. Using a new benzodithiophene (PTB7) and PC71BM (see figure) power conversion efficiency 7.4% has been achieved in PTB7/PC71BM-blend film, indicating great potential bright future for (FF = fill factor, PCE ;= power-conversion efficiency). Detailed facts importance to specialist readers are published as ”Supporting Information”. Such documents peer-reviewed, but not copy-edited or typeset. They...
Highly active, durable, and cost-effective electrocatalysts for water oxidation to evolve oxygen gas hold a key range of renewable energy solutions, including water-splitting rechargeable metal-air batteries. Here, we report the synthesis ultrathin nickel-iron layered double hydroxide (NiFe-LDH) nanoplates on mildly oxidized multiwalled carbon nanotubes (CNTs). Incorporation Fe into nickel induced formation NiFe-LDH. The crystalline NiFe-LDH phase in nanoplate form is found be highly active...
We report the synthesis of a graphene-sulfur composite material by wrapping polyethyleneglycol (PEG) coated submicron sulfur particles with mildly oxidized graphene oxide sheets decorated carbon black nanoparticles. The PEG and coating layers are important to accommodating volume expansion during discharge, trapping soluble polysulfide intermediates rendering electrically conducting. resulting showed high stable specific capacities up ~600mAh/g over more than 100 cycles, representing...
We developed nanosized, reduced graphene oxide (nano-rGO) sheets with high near-infrared (NIR) light absorbance and biocompatibility for potential photothermal therapy. The single-layered nano-rGO were ∼20 nm in average lateral dimension, functionalized noncovalently by amphiphilic PEGylated polymer chains to render stability biological solutions exhibited 6-fold higher NIR absorption than nonreduced, covalently nano-GO. Attaching a targeting peptide bearing the Arg-Gly-Asp (RGD) motif...
We developed two-step solution-phase reactions to form hybrid materials of Mn(3)O(4) nanoparticles on reduced graphene oxide (RGO) sheets for lithium ion battery applications. Selective growth RGO sheets, in contrast free particle solution, allowed the electrically insulating be wired up a current collector through underlying conducting network. The formed show high specific capacity ∼900 mAh/g, near their theoretical capacity, with good rate capability and cycling stability, owing intimate...
Ni(OH)2 nanocrystals grown on graphene sheets with various degrees of oxidation are investigated as electrochemical pseudocapacitor materials for potential energy storage applications. Single-crystalline hexagonal nanoplates directly lightly-oxidized, electrically-conducting (GS) exhibit a high specific capacitance ~1335F/g at charge and discharge current density 2.8A/g ~953F/g 45.7A/g excellent cycling ability. The remarkable rate capability promising applications in supercapacitors both...
This paper describes synthesis and photovoltaic studies of a series new semiconducting polymers with alternating thieno[3,4-b]thiophene benzodithiophene units. The physical properties these were finely tuned to optimize their effect. substitution alkoxy side chains the less electron-donating alkyl or introduction electron-withdrawing fluorine into polymer backbone reduced HOMO energy levels polymers. structural modifications optimized polymers' spectral coverage absorption hole mobility, as...
Through direct nanoparticle nucleation and growth on nitrogen doped, reduced graphene oxide sheets cation substitution of spinel Co(3)O(4) nanoparticles, a manganese-cobalt MnCo(2)O(4)/graphene hybrid was developed as highly efficient electrocatalyst for oxygen reduction reaction (ORR) in alkaline conditions. Electrochemical X-ray near-edge structure (XANES) investigations revealed that the method forming inorganic-nanocarbon hybrids results covalent coupling between nanoparticles N-doped...
A new low band gap semiconducting polymer, PTB1, was synthesized and found promising for solar energy harvesting. Simple polymer cells based on PTB1 methanofullerene [6,6]-phenyl-C(71)-butyric acid methyl esters (PC(71)BM) exhibit a conversion efficiency of 5.6%. An external quantum 67% fill-factor 65% are achieved, both which among the highest values reported cell system polymer.
Electrochemical systems, such as fuel cell and water splitting devices, represent some of the most efficient environmentally friendly technologies for energy conversion storage. Electrocatalysts play key roles in chemical processes but often limit performance entire systems due to insufficient activity, lifetime, or high cost. It has been a long-standing challenge develop durable electrocatalysts at low In this Perspective, we present our recent efforts developing strongly coupled...
Electrochemical reduction of carbon dioxide with renewable energy is a sustainable way producing carbon-neutral fuels. However, developing active, selective and stable electrocatalysts challenging entails material structure design tailoring across range length scales. Here we report cobalt-phthalocyanine-based high-performance electrocatalyst developed combined nanoscale molecular approach. On the nanoscale, cobalt phthalocyanine (CoPc) molecules are uniformly anchored on nanotubes to afford...
Electrocatalyst for oxygen reduction reaction (ORR) is crucial a variety of renewable energy applications and energy-intensive industries. The design synthesis highly active ORR catalysts with strong durability at low cost extremely desirable but remains challenging. Here, we used simple two-step method to synthesize cobalt oxide/carbon nanotube (CNT) strongly coupled hybrid as efficient catalyst by directly growing nanocrystals on oxidized multiwalled CNTs. mildly CNTs provided functional...
A graphene/TiO2 nanocrystals hybrid has been successfully prepared by directly growing TiO2 on graphene oxide (GO) sheets. The direct growth of the GO sheets was achieved a two-step method, in which first coated hydrolysis and crystallized into anatase hydrothermal treatment second step. Slow induced use EtOH/H2O mixed solvent addition H2SO4 facilitates selective suppresses free solution. method offers easy access to GO/TiO2 with uniform coating strong interactions between underlying...
Solar cells based on the polymer-fullerene bulk heterojunction (BHJ) concept are an attractive class of low-cost solar energy harvesting devices. Because power conversion efficiency (PCE) these is still significantly lower than that their inorganic counterparts, however, materials design and device engineering efforts directed toward improving output. A variety factors limit performance BHJ cells, but properties in active layer primary determinant overall efficiency. The ideal polymer a...
Restructuring-induced catalytic activity is an intriguing phenomenon of fundamental importance to rational design high-performance catalyst materials. We study three copper-complex materials for electrocatalytic carbon dioxide reduction. Among them, the copper(II) phthalocyanine exhibits by far highest yielding methane with a Faradaic efficiency 66% and partial current density 13 mA cm−2 at potential – 1.06 V versus reversible hydrogen electrode. Utilizing in-situ operando X-ray absorption...
Herein, we describe the synthesis of fluorinated polythienothiophene-co-benzodithiophenes (PTBFs) and characterization their physical properties, especially performance in solar cells. Fluorination polymer backbone lowered both HOMO LUMO energy levels simultaneously widened bandgap (0.1−0.2 eV). Incorporation fluorine into various positions significantly affected cells' power conversion efficiency from 2.3% to 7.2%. Detailed studies revealed that containing mono-fluorinated thienothiophene...
Organic fluorophores have been widely used for biological imaging in the visible and first near-infrared windows. However, their application second window (NIR-II, 1000–1700 nm) is still limited mainly due to low fluorescence quantum yields (QYs). Here, we explore molecular engineering on donor unit develop high performance NIR-II fluorophores. The are constructed by a shielding unit–donor(s)–acceptor–donor(s)–shielding structure. Thiophene introduced as connected unit, which can increase...
A hybrid electrocatalyst for the oxygen reduction reaction (ORR), consisting of Co1−xS nanoparticles directly nucleated and grown on sheets reduced graphene oxide (RGO; see SEM image), was prepared by a mild solution-phase followed an annealing step. The Co1−xS–RGO has highest catalytic performance all cobalt chalcogenide based ORR catalysts, as revealed inter alia measurements with rotating-disk electrode (see picture; RHE = reversible hydrogen electrode). Detailed facts importance to...