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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

基于LoRa的果园管道自动顺序喷雾系统研究

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农机化研究 2025年第2期47卷 171-175页

作者：胡圣洋陈泽鸿刘伟康代秋芳刘洪山宋淑然李震华南农业大学电子工程学院/人工智能学院广州510642 国家柑橘产业技术体系机械化研究室广州510642 广东省农情信息监测工程技术研究中心广州510642 广东省山地果园机械创新工程技术研究中心广州510642

我国南方果园多处于山地,大型喷雾器械无法进入,为实现山地果园自动顺序喷药,设计了一种基于LoRa无线通信技术的管道自动顺序喷雾系统。系统以Stm32单片机为核心,在管网上部署了6个电磁阀控制节点,采用LoRa无线收发模块进行节点之间的通... 详细信息

我国南方果园多处于山地,大型喷雾器械无法进入,为实现山地果园自动顺序喷药,设计了一种基于LoRa无线通信技术的管道自动顺序喷雾系统。系统以Stm32单片机为核心,在管网上部署了6个电磁阀控制节点,采用LoRa无线收发模块进行节点之间的通信,设计程序控制6个电磁阀依次按顺序打开,并可以通过手机APP远程开启系统。试验结果表明:当节点之间距离为250 m时,数据接收率为95%;系统通信距离远,数据接收率高,具有较高的可靠性,适合于山地果园中使用。

关键词：果园顺序喷雾 LoRa无线通信远程控制通信距离数据接收率

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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

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

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

Monocular vision for variable spray control system

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International Journal of Agricultural and Biological Engineering 2022年第6期15卷 206-215页

作者： Daozong Sun Weikang Liu Runmei Luo Xurui Zhan zehong chen Tao Wei Xinrui Wang Xiuyun Xue Zhen Li Shuran Song College of Electronic Engineering(College of Artificial Intelligence) South China Agricultural UniversityGuangzhou 510642China Guangdong Engineering Research Center for Monitoring Agricultural Information Guangzhou 510642China National Citrus Industry Technology System Mechanization Research Laboratory Guangzhou 510642C

The monocular vision-based system can obtain the leaf wall area characterizing the canopy parameter for online detection and real-time variable spraying,aiming to improve the accuracy of orchard spraying equipment and the utilization efficiency of *** study established a spraying system,in which canopy parameters were collected by monocular vision,and the spray volume decision coefficient was constructed by the leaf wall area and the L^(*)value in International Commission on Illumination Lab color space to control the duty cycle of each solenoid valve to achieve variable *** spray flow models were designed to determine the spray volume decision *** coefficients of determination of the spray volumes with the duty cycle range of 15%to 65%were all over 94 and the error of the leaf wall area values obtained using the improved super green algorithm(calculated as ExG=2.1G–1.1R–1.1B)was only 0.5%.The test showed that there is a negative relationship between canopy denseness and L^(*),and the value of L^(*)is smaller in the dense area compared with the sparse area;the actual flow generated by the system is similar to the theoretical flow when the duty cycle is 65%.The field validation tests showed that the variable spraying system could refine the droplet size and increase the droplet density to a certain extent with the same coverage rate,which had advantages over the continuous *** terms of droplet deposition,DV0.1 and DV0.9 were reduced by 2μm and 18μm,respectively,and the increase of droplet density to 75 droplets/*** the same time,the improvement of droplet distribution uniformity and droplet penetration by 16%and 3%,*** with continuous spraying,variable spraying can achieve 55.64%*** study demonstrates the feasibility of monocular vision in guiding spraying operations and provides a reference for the use of monocular vision in plant protection operations.

关键词： monocular vision leaf wall area Lab color space pulse width modulation variable sprayi

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

Fc-empowered exosomes with superior epithelial layer transmission and lung distribution ability for pulmonary vaccination

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Bioactive Materials 2024年第12期42卷 573-586页

作者： Fan Meng Haonan Xing Jingru Li Yingqi Liu Li Tang zehong chen Xiran Jia Zenglin Yin Jing Yi Mei Lu Xiuli Gao Aiping Zheng School of Pharmaceutical Sciences&State Key Laboratory of Functions and Applications of Medicinal Plants&Microbiology and Biochemical Pharmaceutical Engineering Research Center of Guizhou Provincial Department of Education Guizhou Medical UniversityGuiyang550025China Institute of Pharmacology and Toxicology Academy of Military Medical SciencesBeijing100850China Advanced Research Institute of Multidisciplinary Science School of Life ScienceSchool of Medical Technology(Institute of Engineering Medicine)Key Laboratory of Molecular Medicine and BiotherapyKey Laboratory of Medical Molecule Science and Pharmaceutics Engineering Beijing Institute of TechnologyBeijing100081China

Mucosal vaccines offer potential benefits over parenteral vaccines for they can trigger both systemic immune protection and immune responses at the predominant sites of pathogen ***,the defense function of mucosal barrier remains a challenge for vaccines to ***,we show that surface modification of exosomes with the fragment crystallizable(Fc)part from IgG can deliver the receptor-binding domain(RBD)of SARS-CoV-2 to cross mucosal epithelial layer and permeate into peripheral lung through neonatal Fc receptor(FcRn)mediated *** exosomes F-L-R-Exo are generated by genetically engineered dendritic cells,in which a fusion protein Fc-Lamp2b-RBD is expressed and anchored on the *** intratracheally administration,F-L-R-Exo is able to induce a high level of RBD-specific IgG and IgA antibodies in the animals’***,potent Th1 immune-biased T cell responses were also observed in both systemic and mucosal immune responses.F-L-R-Exo can protect the mice from SARS-CoV-2 pseudovirus infection after a *** findings hold great promise for the development of a novel respiratory mucosal vaccine approach.

关键词： Fc Exosomes Vaccines Mucosal immunity SARS-CoV-2

Defect reduction to enhance the mechanical strength of nanocellulose carbon aerogel

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Chinese Chemical Letters 2024年第1期35卷 492-498页

作者： Haihong Lai zehong chen Hao Zhuo Yijie Hu Xuan Zhao Jiwang Yi Hongzhi Zheng Ge Shi Yifan Tong Ling Meng Xinwen Peng Linxin Zhong State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510641China Huangpu Hydrogen Energy Innovation Center/Guangzhou Key Laboratory for Clean Energy and Materials School of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou 510006China

Carbon aerogels prepared from renewable nano building blocks are rising-star materials and hold great promise in many ***,various defects formed during carbonization at high temperature disfavor the stress transfer and thus the fabrication of flexible carbon aerogel from renewable nano building ***,a structural defect-reducing strategy is proposed by altering the pyrolysis route of cellulose *** salt that inhibits the generation of tar volatilization during pyrolysis can prevent the formation of various structural *** with fewer defects can reduce stress concentration and remarkably enhance the compressibility of carbon aerogel,thus increasing the maximum stress retention of carbon *** carbon aerogel also has high stress sensor sensitivity and excellent temperature coefficient of *** structural defect-reducing strategy will pave a new way to fabricate high-strength carbon materials for various fields.

关键词： Biomass Cellulose nanofiber Pyrolysis Renewable Carbon aerogel