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N-doped carbon nanocube with zinc oxide sodiophilic sites enables a superior sodium metal anode

Nano Research 2023年第1期16卷 411-419页

作者： Yijuan Li Pan Xu Hongbin Ni Jirong Mou tangchao xie Hong Xiao Hengji Zhu Quanfeng Dong Shaoming Huang Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices Collaborative Innovation Center of Advanced Energy MaterialsSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China State Key Laboratory for Physical Chemistry of Solid Surfaces Department of ChemistryCollege of Chemistry and Chemical EngineeringiChEM(Collaborative Innovation Center of Chemistry for Energy Materials)Engineering Research Centre of Electrochemical Technologies of Ministry of EducationXiamen UniversityXiamen 361005China School of Environment and Energy South China University of TechnologyGuangzhou 510006China

The metallic Na has been regarded as the most promising anode for next-generation sodium metal batteries(SMBs)owing to its high theoretical specific capacity,low redox potential,and low cost.The practical applications of Na metal,however,have still been severely hindered by the uncontrolled sodium dendrites growth during Na deposition and stripping processes,which leads to low Coulombic efficiency and poor cycling stability.In this study,sub-nano zinc oxide(ZnO)uniformly dispersed in threedimensional(3D)porous nitrogen-doped(N-doped)carbon nanocube(ZnO@NC)was acquired as a stable host for dendrite-free Na metal anode.Benefiting from the in-situ electrochemically formed sodiophilic nucleation site(NaZn13 alloy)and the enriched pore structure,rapid and uniform sodium deposition behavior can be performed.As expected,the ZnO@NC electrode delivers impressive electrochemical performance,an ultra-high areal capacity of 20 mAh·cm−2 in the half-cell can be maintained for 2,000 h.In the symmetrical-cell,it can also exhibit up to 3,000 h at 3 mA·cm−2 and 3 mAh·cm−2 with low polarization potential.Furthermore,in the full-cell that matches with Prussian blue(PB)cathode,the Na@ZnO@NC anode performs the outstanding long-cycling and rate performance.Therefore,this work provides an effective strategy to inhibit the growth of Na dendrites for the development of high-safety and long-cycling SMBs.

关键词： sub-nano zinc oxide N-doped carbon nanocube sodiophilic site NaZn13 alloy dendrite-free Na metal anode

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Integrative design of laser-induced graphene array with lithiophilic MnOx nanoparticles enables superior lithium metal batteries

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eScience 2023年第5期3卷 77-85页

作者： Hong Xiao Yijuan Li Ruiqi Chen tangchao xie Pan Xu Hengji Zhu Jialang He Weitao Zheng Shaoming Huang Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices Collaborative Innovation Center of Advanced Energy MaterialsSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China State Key Laboratory for Physical Chemistry of Solid Surfaces Department of ChemistryCollege of Chemistry and Chemical EngineeringiChEM(Collaborative Innovation Center of Chemistry for Energy Materials)Engineering Research Centre of Electrochemical Technologies of Ministry of EducationXiamen UniversityXiamen 361005China

The practical applications of lithium metal batteries are limited by uncontrolled dendrite growth during cycling.Herein,we propose a simple and scalable approach to stabilize lithium metal anodes using laser scribing technology to integratively design and construct a laser-induced graphene(LIG)with lithiophilic metal oxide nanoparticles.The porous LIG and lithiophilic MnOx nanoparticles effectively reduce the nucleation overpotential of Li and regulate uniform Li plating,while the array structure offers continuous and ultra-fast ion/electron transport channels,accelerating Lit transport kinetics at high rate and high capacity.Consequently,the Li@MnOx@LIG-a anode exhibits superior rate capability of up to 40 mA cm^(-2) with low nucleation overpotential.It also can withstand ultra-high Li capacity to 20 mAh cm^(-2) without dendrite growth and stably cycle for 3000 h with 100%depth of discharge at 40 mA cm^(-2).More importantly,this technology can be expanded to other metal oxides for various metal batteries.

关键词： Laser-induced graphene technology MnOx@LIG array Lithium metal batteries Dendrite-free High capacity

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The diagnostic criteria for classic parasystole

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Chinese Medical Journal 1999年第11期112卷 33-35页

作者：任在镐周君富徐耕冼棠超谢隆化庄亚纯 Department of Cardiovascular Medicine Second Affiliated Hospital Zhejiang University Medical School Hangzhou 310009 China

ObjectiveTo establish a diagnostic criteria of parasystole with high sensitivity and high specificity.MethodsAfter excluded from nonparasystole and each variant parasystoles, based on the electrocardiographic data obtained from 61 patients with classic parasystole, we selected the quantitative indices which could reflect the features of ectopic focus with complete entrance block as the diagnostic criteria for parasystole.ResultsThe common features of the electrocardiograms of this group were: 1) Take the earliest recorded eight interectopic intervals in which at least four intervals containing sinus beats or other beats having activated to the area within the ectopic focus. When in case of deficiency, it will fill up a vacancy in order. The ratios of the shortest coupling interval to the shortest ectopic cycle length (ECL) were all less than 80%; 2) The coefficients of variation of the eight ECLs were all less than 6%; 3) The maximal differences of coupling intervals were all equal to or more than 0.11 second.ConclusionThree quantitative indices as necessary conditions have been used as diagnostic criteria for parasystole with high sensitivity and high specificity. Chin Med J 1999; 112(11): 992-994

关键词： arrhythmia ·parasystole ·diagnosis ·electrocardiography

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