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| 1 | Environmental application of three-dimensional graphene materials as adsorbents for dyes and heavy metals: Review on ice-templating method and adsorption mechanisms显示文摘The remediation of wastewater requires treatment technologies which are robust, efficient,simple to operate and affordable such as adsorption. Lately, three-dimensional(3D)graphene based materials have attracted significant attention as effective adsorbents for wastewater treatment. The intrinsic properties of 3D graphene structure such as large surface area and interconnected porous structure can facilitate the transport of pollutants into the 3D network and provide abundant active sites for trapping the pollutants. For the synthesis of 3D graphene structure, ice-templating is commonly practiced due to its facile steps, cost effectiveness and high scalability potential. This review covers the icetemplating fabrication technique for 3D graphene based materials and their application as adsorbents in eliminating dyes and heavy metals from aqueous media. The assembly mechanisms of the ice-templating fsynthesis are comprehensively discussed. Further discussion on the fundamental principles, critical process parameters and characteristics of ice-templated 3D graphene structures is also included. A thorough review on the mechanisms for batch adsorption of dyes and heavy metals is presented based on the structures and properties of the 3D graphene materials. The review further evaluates the dynamic adsorption in packed columns and the regeneration of 3D graphene based materials. | Kar Chiew Lai Lai Yee Lee Billie Yan Zhang Hiew Suchithra Thangalazhy-Gopakumar Suyin Gan | 2019 | Journal of Environmental Sciences2019，31，5： | 13 |
| 2 | Designer uniform Li plating/stripping through lithium–cobalt alloying hierarchical scaffolds for scalable high-performance lithium-metal anodes显示文摘Lithium metal anodes are of great interest for advanced high-energy density batteries such as lithiumair, lithium-sulfur and solid-state batteries, due to their low electrode potential and ultra-high theoretical capacity. There are, however, several challenges limiting their practical applications, which include low coulombic efficiency, the uncontrollable growth of dendrites and poor rate capability. Here, a rational design of 3D structured lithium metal anodes comprising of in-situ growth of cobalt-decorated nitrogen-doped carbon nanotubes on continuous carbon nanofibers is demonstrated via electrospinning.The porous and free-standing scaffold can enhance the tolerance to stresses resulting from the intrinsic volume change during Li plating/stripping, delivering a significant boost in both charge/discharge rates and stable cycling performance. A binary Co-Li alloying phase was generated at the initial discharge process, creating more active sites for the Li nucleation and uniform deposition. Characterization and density functional theory calculations show that the conductive and uniformly distributed cobalt-decorated carbon nanotubes with hierarchical structure can effectively reduce the local current density and more easily absorb Li atoms, leading to more uniform Li nucleation during plating. The current work presents an advance on scalable and cost-effective strategies for novel electrode materials with 3D hierarchical microstructures and mechanical flexibility for lithium metal anodes. | Xinhua Liu Xiaojuan Qian Weiqiang Tang Hui Luo Yan Zhao Rui Tan Mo Qiao Xinlei Gao Yang Hua Huizhi Wang Shuangliang Zhao Chao Lai Magda Titirici Nigel PBrandon Shichun Yang Billy Wub | 2021 | Journal of Energy Chemistry2021，30，1： | 2 |
| 3 | Low-efficiency-droop InGaN quantum dot light-emitting diodes operating in the “green gap”显示文摘Gallium nitride(Ga N)-based light-emitting diodes(LEDs)are important for lighting and display applications.In this paper,we demonstrate green-emission(512 nm)In Ga N quantum dot(QD)LEDs grown on a c-plane sapphire substrate by metal-organic chemical vapor deposition.A radiative lifetime of 707 ps for the uniform In Ga N self-assembled QDs is obtained by time-resolved photoluminescence measurement at 18 K.The screening of the built-in fields in the QDs effectively improves the performance of QD LEDs.These high quantum efficiency and high temperature stability green QD LEDs are able to operate with negligible efficiency droop and with current density up to 106 A∕cm^2.Our results show that In Ga N QDs may be a viable option as the active medium for stable LEDs. | CHUNYU ZHAO CHAK WAH TANG BILLY LAI GUANGHUI CHENG JIANNONG WANG KEI MAY LAU | 2020 | Photonics Research2020，8，5： | 2 |
| 4 | Induction of autophagy in hepatocellular carcinoma cells by SB203580 requires activation of AMPK and DAPK but not p38 MAPK显示文摘 | Haitao Zhang George Chen Zhiyi Zhang Sukying Chun Billy Leung Paul Lai | 2012 | Apoptosis2012，，4： | 1 |
| 5 | Highly Aligned Ultra-Thick Gel-Based Cathodes Unlocking Ultra-High Energy Density Batteries显示文摘Increasing electrode thickness can substantially enhance the specific energy of lithium-ion batteries;however,ionic transport,electronic conductivity,and ink rheology are current barriers to adoption.Here,a novel approach using a mixed xanthan gum and locust bean gum binder to construct ultrathick electrodes is proposed to address above issues.After combining aqueous binder with single-walled carbon nanotubes(SWCNT),active material(LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)) and subsequent vacuum freeze-drying,highly aligned,and low-tortuosity structures with a porosity of ca.50%can be achieved with an average pore size of 10μm,whereby the gum binder-SWCNT-NMC811 forms vertical structures supported by tissue-like binder/SWCNT networks allowing for excellent electronic conducting phase percolation.As a result,ultra-thick electrodes with a mass loading of about 511 mg cm^(−2) and 99.5 wt%active materials have been demonstrated with a remarkable areal capacity of 79.3 mAh cm^(−2),which is the highest value reported so far.This represents a>25×improvement compared with conventional electrodes with an areal capacity of about 3 mAh cm^(−2).This route also can be expanded to other electrode materials,such as LiFePO_(4) and Li_(4)Ti_(5)O_(12),and thus opens the possibility for low-cost and sustainable ultra-thick electrodes with increased specific energy for future lithium-ion batteries. | Shichun Yang Chaochao Zhou Qiong Wang Binbin Chen Yan Zhao Bin Guo Zhengjie Zhang Xinlei Gao Ridwanur Chowdhury Huizhi Wang Chao Lai Nigel P.Brandon Billy Wu Xinhua Liu | 2022 | Energy & Environmental Materials2022，5，4： | 0 |
| 6 | Synthesis of a highly recoverable 3D MnO2/rGO hybrid aerogel for efficient adsorptive separation of pharmaceutical residue显示文摘Water contamination by non-steroidal anti-inflammatory drugs,such as acetaminophen,is an emerging ecological concern.In this study,a newthree-dimensionalmanganese dioxideengrafted reduced graphene oxide(3D MnO_(2)/rGO)hybrid aerogel was developed for acetaminophen sequestration.The synthesis involved firstly the self-assembly of GO aerogel,followed by thermal reduction and in-situ MnO_(2) growth by redox-reaction.The aerogel demonstrated interlinked planes with smooth surfaces deposited with MnO_(2) nanospheres and pores of 138.4–235.3μm width.The influences of adsorbent dosage,initial pH,acetaminophen concentration,temperature and contact time were investigated.It was determined that the adsorption of acetaminophen occurred on uniform sorption sites in the aerogel,as suggested by the best fit of data to the Langmuir isotherm,yielding a maximum adsorption capacity of 252.87 mg/g.This highest adsorption performance of the 3D MnO_(2)/rGO aerogel was attained at a dosage of 0.6 g/L,initial pH of 6.2 and temperature of 40℃.The process kinetics were in-line with the pseudo-first-order and pseudo-second-order kinetics at 10 and 20–500 mg/L concentrations,respectively.Thermodynamic assay showed the spontaneity and endothermicity features of the 3D MnO_(2)/rGO-acetaminophen system.The acetaminophen adsorption mechanisms were mainly hydrogen bonding and pore entrapment.Moreover,the as-synthesised aerogel was effectively regenerated using acetone and re-utilised in four adsorption-desorption cycles.Overall,the results highly recommend the implementation of the 3D MnO_(2)/rGO hybrid aerogel for purification of wastewater polluted by acetaminophen residue. | Billie Yan Zhang Hiew Wan Ting Tee Nicholas Yung Li Loh Kar Chiew Lai Svenja Hanson Suyin Gan Suchithra Thangalazhy-Gopakumar Lai Yee Lee | 2022 | Journal of Environmental Sciences2022，34，8： | 0 |
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