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Metal coordination assists fabrication of multifunctional aerogel

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Journal of Materials Science & Technology 2021年第12期71卷 67-74页

作者： Yijie Hu Hao Zhuo Zehong Chen xinwen peng Linxin Zhong Runcang Sun State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510640China Centre for Lignocellulose Science and Engineering College of Light Industry and Chemical EngineeringDalian Polytechnic UniversityDalian 116034China

Interfacial design is one of the most promising ways in improving mechanical properties of *** this work,a multifunctional aerogel with excellent mechanical performances,sensing sensitivity,and fire retardancy is fabricated by taking advantage of metal coordination between biopolymer and Fe3+.Montmorillonite(MMT)nanosheets are added to induce a‘brick and mortar’*** coordination remarkably reduces structural defects,leading to well-formed lamellas that can effectively distribute stress under sever compression without plastic *** structural merits impart the aerogel highly reversible compressibility even at 99%strain and superior ***,it demonstrates high sensing performance in wearable health monitoring devices,and shows fire resistance property that can maintain elasticity in a *** work offers a facile and effective method to create multifunctional aerogels from various polymers.

关键词： Foam Composites Resilient Carbon

Cellulose nanofiber-derived carbon aerogel for advanced room-temperature sodium–sulfur batteries

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Carbon Energy 2023年第1期5卷 1-15页

作者： Wu Yang Wang Yang Ren Zou Yongfa Huang Haihong Lai Zehong Chen xinwen peng State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhouChina

Room-temperature sodium–sulfur(RT/Na–S)batteries are regarded as promising large-scale stationary energy storage systems owing to their high energy density and low cost as well as the earth-abundant reserves of sodium and ***,the diffusion of polysulfides and sluggish kinetics of conversion reactions are still major challenges for their ***,we developed a powerful and functional separator to inhibit the shuttle effect by coating a lightweight three-dimensional cellulose nanofiber-derived carbon aerogel on a glass fiber separator(denoted NSCA@GF).The hierarchical porous structures,favorable electronic conductivity,and three-dimensional interconnected network of N,S-codoped carbon aerogel endow a multifunctional separator with strong polysulfide anchoring capability and fast reaction kinetics of polysulfide conversion,which can act as the barrier layer and an expanded current collector to increase sulfur ***,the hetero-doped N/S sites are believed to strengthen polysulfide anchoring capability via chemisorption and accelerate the redox kinetics of polysulfide conversion,which is confirmed from experimental and theoretical *** a result,the assembled Na–S coin cells with the NSCA@GF separator showed a high reversible capacity(788.8 mAh g^(−1) at 0.1 C after 100 cycles)and superior cycling stability(only 0.059%capacity decay per cycle over 1000 cycles at 1 C),thereby demonstrating the significant potential for application in high-performance RT/Na–S batteries.

关键词： carbon aerogel cellulose nanofiber N,S codoping redox kinetics sodium–sulfur batteries

Base-free selective oxidation of monosaccharide into sugar acid by surface-functionalized carbon nanotube composites

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Chinese Chemical Letters 2023年第11期34卷 116-123页

作者： Zengyong Li Di Li Linxin Zhong Xuehui Li Chuanfu Liu xinwen peng State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510641China School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510641China

Selective oxidation of biomass-derived monosaccharide into high value-added chemicals is highly desirable from sustainability ***,we demonstrate a surface-functionalized carbon nanotubesupported gold(Au/CNT-O and Au/CNT-N)catalyst for base-free oxidation of monosaccharide into sugar ***/CNT-O and Au/CNT-N surfaces successfully introduced oxygen-and nitrogen-containing functional groups,*** highest yields of gluconic acid and xylonic acid were 93.3%and 94.3%,respectively,using Au/CNT-N at 90℃ for 240 min,which is higher than that of using Au/*** rate constants for monosaccharide decomposition and sugar acid formation in Au/CNT-N system were higher,while the corresponding activation energy was lower than in Au/CNT-O *** calculation revealed that the mechanism of glucose oxidation to gluconic acid involves the adsorption and activation of O_(2),adsorption of glucose,dissociation of the formyl C-H bond and formation of O-H bond,and formation and desorption of gluconic *** activation energy barrier for the glucose oxidation over Au/CNT-N is lower than that of Au/*** nitrogen-containing functional groups are more beneficial for accelerating monosaccharide oxidation and enhancing sugar acid selectivity than oxygen-containing functional *** work presents a useful guidance for designing and developing highly active catalysts for producing high-value-added chemicals from biomass.

关键词： Surface functionalization Base-free oxidation Sugar acid Kinetic study DFT calculation

Reversible aqueous zinc-ion battery based on ferric vanadate cathode

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Chinese Chemical Letters 2022年第10期33卷 4628-4634页

作者： Wang Yang Wu Yang Yongfeng Huang Chengjun Xu Liubing Dong xinwen peng State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510640China Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 518055China College of Chemistry and Materials Science Jinan UniversityGuangzhou 511443China

Rechargeable aqueous zinc-ion batteries have attracted extensive interest because of low cost and high ***,the relationship between structure change of cathode and the zinc ion storage mechanism is still complex and ***,open-structured ferric vanadate(Fe_(2)V_(4)O_(13))has been developed as cathode material for aqueous zinc-ion ***,two zinc ion storage mechanism can be observed simultaneously for the Fe2V4O13 electrode,i.e.,classical intercalation/deintercalation storage mechanism in the tunnel structure of Fe_(2)V_(4)O_(13),and reversible phase transformation from ferric vanadate to zinc vanadate,which is verified by combined studies using various in-situ and ex-situ *** a result,the Fe_(2)V_(4)O_(13) cathode delivers a high discharge capacity of 380 mAh/g at 0.2 A/g,and stable cyclic performance up to 1000 cycles at 10 A/g in the operating window of 0.2-1.6 V with 2 mol/L Zn(CF_(3)SO_(3))_(2) aqueous ***,the assembled Fe_(2)V_(4)O_(13)//Zn flexible quasi-solid-state battery also exhibits a relatively high mechanical strength and good cycling *** findings reveal a new perspective of zinc ion storage mechanism for Fe_(2)V_(4)O_(13),which may also be applicable to other vanadate cathodes,providing a new direction for the investigation and design of zinc-ion batteries.

关键词： Aqueous zinc-ion battery Ferric vanadate cathode Reversible phase transformation Zinc ion storage mechanism Biomass-based flexible quasi-solid-state battery

Biomass-based N doped carbon as metal-free catalyst for selective oxidation of D-xylose into D-xylonic acid

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Green Energy & Environment 2022年第6期7卷 1310-1317页

作者： Zengyong Li Yiming Huang Xiao Chi Di Li Linxin Zhong Xuehui Li Chuanfu Liu xinwen peng State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou510640China School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou510640China

Rational design and facile preparation of low-cost and efficient catalysts for the selective converting of biomass-derived monosaccharides into high value-added chemicals is highly demanded,yet ***,we first demonstrate a N doped defect-rich carbon(NC-800-5)as metal-free catalyst for the selective oxidation of D-xylose into D-xylonic acid in alkaline aqueous solution at 100℃ for 30 min,with 57.4%*** doped graphitic N is found to be the active site and hydroxyl ion participating in the oxidation of *** ion and D-xylose first adsorb on NC-800-5 surface,and the aldehyde group of D-xylose is catalyzed to form germinal diols ***,C–H bond break to yield carboxylic ***,NC-800-5 catalyst shows high stability in recycled test.

关键词： Biomass carbon Metal-free catalysts D-xylose Sugar acid Selective oxidation

Self-assembly fabrication of lignin-derived carbon with dual heteroatoms doping for high-performance supercapacitor

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Collagen and Leather 2023年第3期5卷 93-105页

作者： Zehong Chen Haihong Lai Hao Zhuo Yu Lin Zhong Linxin Zhong xinwen peng State Key Laboratory of Pulp and Paper Engineering South China University of Technology381 Wushan RoadTianhe DistrictGuangzhou 510641People's Republic of China Department of Mechanical Engineering National University of Singapore3 Engineering Drive 2Singapore 117576Singapore Queensland Micro-and Nanotechnology Centre School of Environment and ScienceGriffith UniversityNathanQLD 4111Australia

Renewable and low-cost biomass is an ideal sustainable alternative to petroleum-based resources,but producing biomass-based carbon electrode with high performances remains a ***,we propose a facile self-assembly strategy to fabricate a biomass-derived N,S co-doping carbon electrode from lignosulfonate without any activation or template *** advantage of the coordination between Fe ions and lignosulfonate,the resultant carbon exhibits a spherical structure with abundant graphitized nanosheets,leading to a high specific surface area with rational pore structure,which are beneficial to the electron/ion transport and *** high contents of doping N(8.47 wt%)and S(2.56 wt%)significantly boost the electrochemical *** a supercapacitor electrode,the carbon material displays high specific capacitance of 390 F g^(-1),excellent cycling stability and high energy density of 14.7 W h kg^(-1)at a power density of 450 W kg^(-1).This study provides a potential strategy for synthesizing cost-effective heteroatom-doped carbon materials from biomass with abundant functional groups and heteroatom sources,such as chitosan,collagen,and gelatin.

关键词： Biomass Lignosulfonate N S co-doping Self-assembly Supercapacitor

Amphoteric Supramolecular Nanofiber Separator for High-Performance Sodium-Ion Batteries

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Energy & Environmental Materials 2024年第5期7卷 114-121页

作者： Yuping Zhang Hongzhi Zheng Xing Tong Hao Zhuo Wu Yang Yuling Chen Ge Shi Zehong Chen Linxin Zhong xinwen peng State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510641China Department of Chemistry UBC Faculty of ScienceVancouver Campus2036 Main MallVancouverBCCanadaV6T 1Z1 Department of Mechanical Engineering National University of Singapore3 Engineering Drive 2Singapore 117576Singapore

The separator is an essential component of sodium-ion batteries(SIBs)to determine their electrochemical ***,the separator with high mechanical strength,good electrolyte wettability and excellent electrochemical performance remains an open ***,a new separator consisting of amphoteric nanofibers with abundant functional groups was fabricated through supramolecular assembly of natural polymers for *** uniform nanoporous structure,remarkable mechanical properties and abundant functional groups(e.g.-COOH,-NH_(2)and-OH)endow the separator with lower dissolution activation energy and higher ion migration *** metrics enable the separator to lower the barrier for desolvation of Na^(+),accelerate the migration of Na^(+),and generate more stable solid electrolyte interphase(SEI)and cathode electrolyte interphase(CEI).The battery assembled with the amphoteric nanofiber separator shows higher specific capacity and better stability than that assembled with glass fiber(GF)separator.

关键词： amphoteric nanofiber self-assembly Separator sodium-ion batteries

Atomically dispersed Mn-N_(x) catalysts derived from Mn-hexamine coordination frameworks for oxygen reduction reaction

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Carbon Energy 2024年第5期6卷 114-126页

作者： Guoyu Zhong Liuyong Zou Xiao Chi Zhen Meng Zehong Chen Tingzhen Li Yongfa Huang Xiaobo Fu Wenbo Liao Shaona Zheng Yongjun Xu Feng peng xinwen peng Guangdong Provincial Key Laboratory of Distributed Energy Systems School of Chemical Engineering and Energy TechnologyDongguan University of TechnologyDongguanChina State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhouChina Department of Chemistry Centre for Advanced 2D Materials(CA2DM)National University of SingaporeSingaporeSingapore School of Chemistry and Chemical Engineering Guangzhou UniversityGuangzhouChina

Metal-organic frameworks recently have been burgeoning and used as precursors to obtain various metal-nitrogen-carbon catalysts for oxygen reduction reaction(ORR).Although rarely studied,Mn-N-C is a promising catalyst for ORR due to its weak Fenton reaction activity and strong graphitization ***,we developed a facile strategy for anchoring the atomically dispersed nitrogen-coordinated single Mn sites on carbon nanosheets(MnNCS)from an Mn-hexamine coordination *** atomically dispersed Mn-N_(4) sites were dispersed on ultrathin carbon nanosheets with a hierarchically porous *** optimized MnNCS displayed an excellent ORR performance in half-cells(0.89 V *** hydrogen electrode(RHE)in base and 0.76 V *** in acid in half-wave potential)and Zn-air batteries(233 mW cm^(−2)in peak power density),along with significantly enhanced *** functional theory calculations further corroborated that the Mn-N_(4)-C(12)site has favorable adsorption of*OH as the rate-determining *** findings demonstrate that the metal-hexamine coordination framework can be used as a model system for the rational design of highly active atomic metal catalysts for energy applications.

关键词： carbon nanosheets electrocatalyst metal-organic frameworks Mn-N_(4) oxygen reduction reaction Zn-air batteries

Thermoelectric generator based on anisotropic wood aerogel for low-grade heat energy harvesting

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Journal of Materials Science & Technology 2022年第25期120卷 150-158页

作者： Xuan Zhao Zehong Chen Hao Zhuo Yijie Hu Ge Shi Bing Wang Haihong Lai Sherif Araby Wenjia Han xinwen peng Linxin Zhong State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510641China Department of Mechanical and Aerospace Engineering Nazarbayev University53 Kabanbay Batyr AvenueNur-SultanKazakhstan State Key Laboratory of Bio-based Material and Green Papermaking Qilu University of TechnologyJinan 250353China

Thermoelectric generators(TEGs)have received increasing attention due to their potential to harvest low-grade heat energy(<100℃ )and provide power for the Internet of Things(IoT)and wearable electronic ***,a wood-based ordered framework is used to fabricate carbon nanotube/poly(3,4-ethylenedioxythiophene)(CNT/PEDOT)wood aerogel for *** prepared CNT/PEDOT wood aerogel with an anisotropic structure exhibits a low thermal conductivity of 0.17 W m^(−1)K^(−1)and is advantageous to develop a sufficient temperature ***,CNT/PEDOT composites effectively decouple the relationship between the Seebeck coefficient and electrical conductivity by energy filtering effect to enhance thermoelectric(TE)output *** vertical TEG assembled by the CNT/PEDOT wood aerogels reveals an output power of 1.5μW and a mass-specific power of 15.48μW g^(−1)at a temperature difference of 39.4 ***,the layered structure renders high compressibility and fatigue *** anisotropic structure,high mechanical performance,and rapid thermoelectric response,enabling the TEG based on CNT/PEDOT wood aerogel offer opportunities for continuous power supply to low-power electronic devices.

关键词： Wood Nano cellulose Energy harvesting Wearable devices Thermoelectric generator