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Electrodeposited Sulfur and CoxS Electrocatalyst on Buckypaper as High-Performance Cathode for Li-S Batteries

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Nano-Micro Letters 2020年第10期12卷 263-275页

作者： Yi Zhan Andrea Buffa Linghui Yu Zhichuan JXu Daniel Mandler School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore Institute of Chemistry The Hebrew University of Jerusalem9190401 JerusalemIsrael Campus for research Excellence and Technological enterprise(CREATE) Singapore-HUJ Alliance for Research and Enterprise(SHARE)Singapore 138602Singapore

Lithium-sulfur batteries(LSBs)are considered as the next generation of advanced rechargeable batteries because of their high energy *** this study,sulfur and CoxS electrocatalyst are deposited on carbon nanotube buckypaper(S/CoxS/BP)by a facile electrodeposition method and are used as a binder-free high-performance cathode for *** sulfur is deposited on buckypaper by electrooxidation of a polysulfide solution(-S6^2-).This approach substantially increased the current and time efficiency of sulfur electrochemical deposition on conductive material for LSBs.S/CoxS/BP cathode could deliver an initial discharge capacity as high as 1650 mAh g^-1 at 0.1 C,which is close to the theoretical capacity of *** current rate of 0.5 C,the S/CoxS/BP has a capacity of 1420 mAh g^-1 at the first cycle and 715 mAh g^-1 after 500 cycles with a fading rate of 0.099%per *** high capacity of S/CoxS/BP is attributed to both the homogeneous dispersion of nanosized sulfur within BP and the presence of CoxS *** sodium dodecyl sulfate(SDS)pretreatment of BP renders it polarity to bind polysulfides and thus facilitates the good dispersibility of nanosized sulfur within *** catalyst accelerates the kinetics of polysulfide conversion and reduces the presence of polysulfide in the cathode,which suppresses the polysulfide diffusion to anode,i.e.,the shuttle *** mitigation of the active material loss improves not only the capacity but also the cyclability of S/CoxS/BP.

关键词： Electrodeposition Lithium sulfur batteries Buckypaper Electrocatalysts

Sustainable wearable energy storage devices self-charged by human-body bioenergy

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SusMat 2021年第2期1卷 285-302页

作者： Jian Lv Jian Chen Pooi See Lee School of Materials Science and Engineering Nanyang Technological UniversitySingaporeSingapore singapore-huj alliance for research and enterprise(SHARE) Nanomaterials for Energy and Energy Water Nexus(NEW)Campus for Research Excellence and Technological EnterpriseSingaporeSingapore

Charging wearable energy storage devices with bioenergy from human-bodymotions, biofluids, and body heat holds great potential to construct self-powered body-worn electronics, especially considering the ceaseless nature ofhuman metabolic activities. To bridge the gap between human-body bioen-ergy and storage of energy, wearable triboelectric/piezoelectric nanogenerators(TENGs/PENGs), biofuel cells (BFCs), thermoelectric generators (TEGs) havebeen designed to harvest energy from body-motions, biofluids, and body heat,respectively. researchers have explored various strategies using bioenergy har-vesters to charge wearable supercapacitors and batteries to relieve or even fullyeliminate the recharging process from external power stations, thus, makingwearable electronics more sustainable, autonomous, and user friendly. In thisarticle, we review the advances in the design of sustainable energy storagedevices charged by human-body energy harvesters. The progress in multifunc-tional wearable energy storage devices that cater to the easy integration withhuman-body energy harvesters will be summarized. Then, the focus is laid onthe integrating strategies (single-cell strategy and separated-cell strategy), devicedesign, materials selection, and characteristics of different self-charging human-body energy harvesting-storage systems. Finally, the challenges that impedethe wide application of human-body energy harvesters charged supercapaci-tors/batteries and prospects will be discussed both from materials and structuraldesign aspects.

关键词： human-body bioenergy self-charging sustainable wearable energy storage devices

A Flexible and Lightweight Biomass-Reinforced Microwave Absorber

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Nano-Micro Letters 2020年第10期12卷 1-15页

作者： Yan Cheng Justin Zhu Yeow Seow Huanqin Zhao Zhichuan JXu Guangbin Ji College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016People’s Republic of China School of Materials Science and Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore singapore-huj alliance for research and enterprise NEW-CREATE PhaseⅡCampus for Research Excellence and Technological Enterprise(CREATE)Singapore 138602Singapore

Developing a flexible,light-weight and effective electromagnetic(EM)absorber remains challenging despite being on increasing demand as more wearable devices and portable electronics are ***,we report a flexible and lightweight hybrid paper by a facile vacuumfiltration-induced self-assembly process,in which cotton-derived carbon fibers serve as flexible skeletons,compactly surrounded by other microwave-attenuating components(reduced graphene oxide and Fe3O4@C nanowires).Owing to its unique architecture and synergy of the three components,the asprepared hybrid paper exhibits flexible and lightweight features as well as superb microwave absorption *** absorption intensity with reflection loss as low as-63 dB can be achieved,and its broadest frequency absorption bandwidth of 5.8 GHz almost covers the entire Ku *** a hybrid paper is promising to cope with ever-increasing EM *** work also paves the way to develop low-cost and flexible EM wave absorber from biomass through a facile method.

关键词： Flexible Biomass Microwave absorption Dielectric loss Magnetic loss

Decimal Solvent-Based High-Entropy Electrolyte Enabling the Extended Survival Temperature of Lithium-Ion Batteries to−130°C

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CCS Chemistry 2021年第4期3卷 1245-1255页

作者： Wei Zhang Huarong Xia Zhiqiang Zhu Zhisheng Lv Shengkai Cao Jiaqi Wei Yifei Luo Yao Xiao Lin Liu Xiaodong Chen Innovative Centre for Flexible Devices(iFLEX) School of Materials Science and EngineeringNanyang Technological UniversitySingapore 639798 singapore-huj alliance for research and enterprise Campus for Research Excellence and Technological EnterpriseSingapore 138602

Freezing and crystallization of commercial ethylene carbonate-based binary electrolytes,leading to irreversible damage to lithium-ion batteries(LIBs),remain a significant challenge for the survival of energy storage devices at extremely low temperatures(<−40°C).Herein,a decimal solvent-based high-entropy electrolyte is developed with an unprecedented low freezing point of−130°C to significantly extend the service temperature range of LIBs,far superior to−30°C of the commercial *** from conventional electrolytes,this molecularly disordered solvent mixture greatly suppresses the freezing crystallization of electrolytes,providing good protection for LIBs from possible mechanical damage at extremely low *** from this,our high-entropy electrolyte exhibits extraordinarily high ionic conductivity of 0.62 mS·cm−1 at−60°C,several orders of magnitude higher than the frozen commercial ***,LIBs utilizing decimal electrolytes can be charged and discharged even at an ultra-low temperature of−60°C,maintaining high capacity retention(∼80%at−40°C)as well as remarkable rate *** study provides design strategies of low-temperature electrolytes to extend the service temperature range of LIBs,creating a new avenue for improving the survival and operation of various energy storage systems under extreme environmental conditions.

关键词： low temperatures lithium-ion batteries electrolytes high entropy decimal solvent

Optimizing interfacial electronic coupling with metal oxide to activate inert polyaniline for superior electrocatalytic hydrogen generation

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Carbon Energy 2019年第1期1卷 77-84页

作者： Zhen-Feng Huang Jiajia Song Yonghua Du Shuo Dou Libo Sun Wei Chen Kaidi Yuan Zhengfei Dai Xin Wang School of Chemical and Biomedical Engineering Nanyang Technological UniversitySingaporeSingapore singapore-huj alliance for research and enterprise NEW-CREATE Phase IICampus for Research Excellence and Technological Enterprise(CREATE)SingaporeSingapore Institute of Chemical and Engineering Sciences A*STARJurong IslandSingapore Department of Chemistry National University of SingaporeSingaporeSingapore School of Materials Science and Engineering Nanyang Technological UniversitySingaporeSingapore

Tuning and optimization of electronic structures and related reaction energetics are critical toward the rational design of efficient ***,experimental and theoretical calculation demonstrate the originally inert N site within polyaniline(PANI)can be activated for hydrogen evolution by proper d-πinterfacial electronic coupling with metal *** a result,the assynthesized WO3 assemblies@PANI via a facile redox-induced assembly and in situ polymerization,exhibits the electrocatalytic production of hydrogen better than other control samples including W18O49@PANI and most of the reported nobel-metal-free electrocatalysts,with low overpotential of 74 mV at 10 mA·cm−2 and small Tafel slope of 46 mV·dec−1 in 0.5M H2SO4(comparable to commercial Pt/C).The general efficacy of this methodology is also validated by extension to other metal oxides such as MoO3 with similar improvements.

关键词： hydrogen evolution interfacial electronic coupling metal oxide N-H bond polyaniline

Biomass-Derived Porous Carbon-Based Nanostructures for Microwave Absorption

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Nano-Micro Letters 2019年第2期11卷 81-97页

作者： Huanqin Zhao Yan Cheng Wei Liu Lieji Yang Baoshan Zhang Luyuan Paul Wang Guangbin Ji Zhichuan J.Xu College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016People’s Republic of China School of Electronic Science and Engineering Nanjing UniversityNanjing 210093People’s Republic of China School of Materials Sciences and Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore singapore-huj alliance for research and enterprise NEW-CREATE Phase IICampus for Research Excellence and Technological Enterprise(CREATE)Singapore 138602Singapore

Currently,electromagnetic(EM) pollution poses severe complication toward the operation of electronic devices and biological *** this end,it is pertinent to develop novel microwave absorbers through compositional and structural *** carbon(PC)materials demonstrate great potential in EM wave absorption due to their ultralow density,large surface area,and excellent dielectric loss ***,the large-scale production of PC materials through low-cost and simple synthetic route is a *** PC materials through biomass sources is a sustainable,ubiquitous,and low-cost method,which comes with many desired features,such as hierarchical texture,periodic pattern,and some unique *** the bio-inspired microstructure to manufacture PC materials in mild condition is *** this review,we summarize the EM wave absorption application of biomass-derived PC materials from optimizing structureand designing *** corresponding synthetic mechanisms and development prospects are discussed as *** perspective in this field is given at the end of the article.

关键词： Biomass resource Porous carbon Microwave absorption

The possible implications of magnetic field effect on understanding the reactant of water splitting

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Chinese Journal of Catalysis 2022年第1期43卷 148-157页

作者： Chao Wei Zhichuan J.Xu School of Materials Science and Engineering Nanyang Technological UniversitySingapore Energy research Institute Nanyang Technological UniversitySingapore singapore‐huj alliance for research and enterprise NEW‐CREATE Phase IICampus for Research Excellence and Technological Enterprise(CREATE)Singapore

Electrochemical water splitting consists of two elementary reactions i.e.,hydrogen evolution reaction(HER)and oxygen evolution reaction(OER).Developing robust HER and OER technologies necessitates a molecular picture of reaction mechanism,yet the reactants for water splitting reactions are unfortunately not fully *** we utilize magnetic field to understand proton transport in HER,and hydroxide ion transport in OER,to discuss the possible implications on understanding the reactants for HER and *** field is a known tool for changing the movement of charged species like ions,*** magnetic‐field‐improved Cu^(2+)transportation near the electrode in Cu ***,applying a magnetic field does not affect the HER or OER rate across various pH,which challenges the traditional opinion that charged species(*** and hydroxide ion)act as the *** anomalous response of HER and OER to magnetic field,and the fact that the transport of proton and hydroxide ion follow Grotthuss mechanism,collectively indicate water may act as the universal reactant for HER and OER across various *** the aid of magnetic field,this work serves as an understanding of water might be the reactant in HER and OER,and possibly in other electrocatalysis reactions involving protonation and deprotonation step.A model that simply focuses on the charged species but overlooking the complexity of the whole electrolyte phase where water is the dominant species,may not reasonably reflect the electrochemistry of HER and OER in aqueous electrolyte.

关键词： Electrocatalysis Water splitting Magnetic field Lorenz force Metal deposition

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Methanol electro-oxidation to formate on iron-substituted lanthanum cobaltite perovskite oxides

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eScience 2022年第1期2卷 87-94页

作者： Fanxu Meng Chencheng Dai Zheng Liu Songzhu Luo Jingjie Ge Yan Duan Gao Chen Chao Wei Riccardo Ruixi Chen Jiarui Wang Daniel Mandler Zhichuan J.Xu School of Materials Science and Engineering Nanyang Technological University50 NanyangAvenueSingapore639798Singapore Energy research Institute@NTU ERI@N Interdisciplinary Graduate SchoolTechnological UniversityNanyangSingapore639798Singapore singapore-huj alliance for research and enterprise NEW-CREATE Phase IICampus for Research Excellence and Technological Enterprise(CREATE)Singapore138602Singapore Institute of Chemistry The Hebrew University of JerusalemJerusalem9190401Israel

Electrochemically producing formate by oxidizing methanol is a promising way to add value to *** metal-based electrocatalysts,which have been extensively studied for the methanol oxidation reaction,can catalyze the complete oxidation of methanol to carbon dioxide,but not the mild oxidation to *** a result,exploring efficient and earth-abundant electrocatalysts for formate production from methanol is of ***,we present the electro-oxidation of methanol to formate,catalyzed by iron-substituted lanthanum cobaltite(LaCo_(1-x)Fe_(x)O_(3)).The Fe/Co ratio in the oxides greatly influences the activity and *** effect is attributed to the higher affinity of Fe and Co to the two reactants:CH3OH and OH,*** a balance between these affinities is favored,LaCo_(0.5)Fe_(0.5)O_(3) shows the highest formate production rate,at 24.5 mmol h^(-1) g_(oxide)^(-1),and a relatively high Faradaic efficiency of 44.4%in a series of(LaCo_(1-x)Fe_(x)O_(3))samples(x=0.00,0.25,0.50,0.75,1.00)at 1.6 V versus a reversible hydrogen electrode.

关键词： Methanol Electro-oxidation Formate Oxides Perovskite

Pharmacological approach to restoring steroid sensitivity in respiratory diseases

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中国药理学与毒理学杂志 2018年第4期32卷 242-243页

作者： W.S. Fred WONG Department of Pharmacology Yong Loo Lin School of Medicine National University Health System 117600 Singapore Immunology Program Life Science Institute National University of Singapore 117456 Singapore singapore-huj alliance for research a

Inhaled corticosteroid is the first-line controller for asthma and ***,about 10% of the asthmatics(severe/refractory asthma) and most of the COPD patients are resistant to the beneficial effects of *** is a pressing unmet medical need to develop novel therapeutic agents to restore corticosteroid efficacy in affected *** have been reports showing the promise of theophylline and rapamycin in reversing steroid resistance in *** laboratory has demonstrated that andrographolide,a bioactive diterpenoid lactone isolated from the plant Andrographis paniculata,is an effective anti-inflammatory and anti-oxidative compound in both asthma and COPD experimental *** a severe asthma mouse model using combined IFN-γ/LPS exposure,production of IL-27 and methacholine-induced airway hyperresponsiveness(AHR) were found to be *** was found to restore the anti-inflammatory effect of dexamethasone in LPS/IFN-γ-induced IL-27 levels in bronchoalveolar lavage(BAL) fluid and AHR in ***/IFN-γ markedly reduced the nuclear level of histone deacetylase-2(HDAC2),an essential epigenetic enzyme that mediates corticosteroid anti-inflammatory *** significantly restored nuclear HDAC2 levels and diminished total HAT/HDAC activity ratio in mouse lungs exposed to LPS/IFN-γ,probably via suppression of PI3K/Akt/HDAC2 phosphorylation and up-regulation of the antioxidant transcription factor Nrf2 *** a cigarette smoke(CS)-induced COPD model,andrographolide markedly restored dexamethasone actions in inhibiting CS-induced lung *** addition,andrographolide facilitated dexamethasone actions to suppress BAL fluid IL-6,IL-1b,KC and IL-17 *** lung lysates,andrographolide markedly restored total nuclear HDAC *** complete steroid re-sensitization mechanism of andrographolide remains to be ***,our existing data strongly implicate a potentially novel steroid re

关键词：皮质类固醇治疗方法药物治疗哮喘