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Perspective on High-Energy Carbon-Based Supercapacitors

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Energy & Environmental Materials 2020年第3期3卷 286-305页

作者： qingyun dou Ho Seok Park School of Chemical Engineering Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746Korea Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences and Technology(SAIHST)Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746Korea SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746Korea

Supercapacitors based on carbon materials have advantages such as high power density,fast charging/discharging capability,and long lifetime stability,playing a vital role in the field of electrochemical energy storage *** further expand the practical applications of carbon-based supercapacitors,their energy density,which is essentially determined by the specific capacitance and operating voltage,should be *** review provides fundamental knowledge on achieving high energy density of *** first address the relationship of the features of carbon materials,such as the surface area,pore size distribution,and surface functional groups,with their electrochemical performances,such as the gravimetric and volumetric capacitance,surface pseudocapacitance,and operating ***,we discuss the properties of electrolytes from nonaqueous and aqueous to hybrid one from the thermodynamic and kinetic aspects,and present their effects on capacitance and operating ***,we illustrate different cell design strategies and their basic principles for increasing operating *** also highlight the recent advances related to these fields and provide our insight into high-energy supercapacitors.

关键词： carbon material cell design electrolyte energy density supercapacitors

Bifunctional fluoropyridinium-based cationic electrolyte additive for dendrite-free Li metal anode

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Nano Research 2023年第7期16卷 9530-9537页

作者： Kunyao Peng Pei Tang Qianqian Yao qingyun dou Xingbin Yan Department of Materials Science and Engineering Sun Yat-Sen UniversityGuangzhou 510275China

Although lithium metal has become a promising anode material for high-energy batteries owing to its high specific capacity and the lowest reduction potential,the continuous side reactions with electrolyte as well as the safety problem caused by Li dendrite growth restrict Li anode’s practical ***,we demonstrate that N-fluoropyridinium(ArF^(+))bis(trifluoromethane)sulfonimide(TFSI-)as an electrolyte additive can protect the lithium metal by both solid electrolyte interphase(SEI)protection and electrostatic repulsion *** ArF+cations not only participate in forming F,Ncontaining SEI protective layer on Li surface,but also act as a cationic repellent during Li deposition to inhibit Li dendrite *** a result,the cycle performance of Li symmetric cells and Li||LiFePO_(4)full cells were significantly improved by using ArFTFSIadded *** study provides an electrolyte additive strategy for Li anode realizing SEI protection and electrostatic repulsion simultaneously.

关键词： lithium metal anode electrolyte additive solid electrolyte interphase(SEI) electrostatic repulsion lithium metal battery(LMB)

Unraveling the mechanism of potassium metal capacitor for highly efficient charge storage

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Science China Chemistry 2024年第5期67卷 1578-1588页

作者： Qianqian Yao Pei Tang Kunyao Peng Zhenyuan Miao Yuecong Chen qingyun dou Xingbin Yan Department of Materials Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China South China Academy of Advanced Optoelectronics South China Normal UniversityGuangzhou 510006China

Although hybrid metal ion capacitors(MICs) are highly desired to achieve both high power density of supercapacitors and high energy density of rechargeable batteries, the mismatch problem of electrochemical kinetics of negative and positive electrodes in MICs hampers the realization of this goal. Here, a new hybrid capacitor concept-potassium metal capacitor(PMC) is proposed for the first time, where potassium metal and commercial activated carbon(AC) without any modification are applied as negative and positive electrodes, respectively, and the electrolyte is the same as that of non-aqueous potassium ion batteries. The simplest PMC prototype exhibits a good combination of high energy density(184.9 Wh kg^(-1)) and power density(12.4 kW kg^(-1)), which benefits from the synergistic effect of potassium metal and AC electrode. The former experiences fast potassium plating/striping during charging and discharging, and the later possesses complex multiple charge behaviors driven by low potential of potassium metal. Specifically, below open-circuit voltage, transportation of solvated cations in AC pores plays an important role;beyond this voltage, synergy actions of cations and anions, including adsorption/desorption of solvated cations and anions, and ions exchange between them, dominate the capacitance contribution. This work enriches the types of MICs, and deepens the understanding of the energy storage mechanism of non-aqueous hybrid metal capacitors.

关键词： hybrid capacitor potassium metal activated carbon charge storage mechanism

double-kill contribution of high-roughness high-density porous carbon electrodes to mechanically self-sensing supercapacitors

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Nano Research 2024年第7期17卷 6157-6167页

作者： Jue Huang Pengyu Liu Yiqun Wang Keren Dai qingyun dou Yajiang Yin Xiaofeng Wang Zheng You Department of Precision Instrument Tsinghua UniversityBeijing 100084China State Key Laboratory of Precision Measurement Technology and Instruments Beijing 100084China Department of Materials Science and Engineering Sun Yat-Sen UniversityGuangzhou 510275China ZNDY of Ministerial Key Laboratory School of Mechanical EngineeringNanjing University of Science and TechnologyNanjing 210094China Qiyuan Laboratory Beijing 100095China

Impact detecting and counting are fundamental functions of fuses used in hard target penetration ***,detection failure caused by battery breakdown in high-g acceleration environments poses a vulnerability for such *** paper introduces a novel supercapacitor that combines energy storage and high-g impact detection,called self-sensing *** deliberately inducing a transient soft short-circuit during shock in the supercapacitor,it is possible to detect external impact by its transient voltage *** realize this concept,firstly,by introducing the contact theory and force-induced percolation model,the electrode strength and roughness are found to have key impacts on the formation of soft ***,to meet the needs for sensitivity and capacity,a high-density porous carbon(HDPC)that combines high mechanical strength and porosity,is selected as a suitable candidate based on the analysis ***,a two-step curing method is proposed to prepare the high-roughness HDPC(HRHDPC)electrode and to assemble the self-sensing *** to the rich specific surface of the electrodes and the high surface strength and roughness conducive to the formation of transient soft short circuits,the self-sensing supercapacitor not only possesses an excellent specific capacitance(171 F/g at 0.5 A/g)but also generates significant voltage response signals when subjected to high-g impacts ranging from 8000g to 31,***,the self-sensing supercapacitor is applied to compose a successive high-g impact counting system and compared to traditional solutions(sensors and tantalum capacitors)in the military *** results show that the self-sensing supercapacitor-based system exhibits advantages in terms of size,power consumption,and counting accuracy.

关键词： supercapacitor self-sensing soft short-circuit impact sensing

Two-Dimensional Pseudocapacitive Nanomaterials for High-Energy-and High-Power-Oriented Applications of Supercapacitors

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Accounts of Materials Research 2021年第2期2卷 86-96页

作者： Puritut Nakhanivej qingyun dou Peixun Xiong Ho Seok Park School of Chemical Engineering College of EngineeringSungkyunkwan UniversitySuwon-siGyeonggi-do 440-746Republic of Korea School of Chemical Engineering College of Engineering and SKKU Advanced Institute of Nanotechnology(SAINT)College of Engineering

CONSPECTUS:Supercapacitors(SCs)are electrochemical energy storage devices that can fill the gap between batteries and electrolytic ***,the widespread applications of commercialized carbon-based SCs are limited by their energy density,arising from their physical charge storage mechanism,which is by far lower than that of ***,the highpowered applications of SCs are also limited by their kinetics,which are slower than those of electrolytic capacitor due to the diffusion and distribution of ions onto the tortuous porous ***,the energy and power performance of SCs need to be improved to open or further extend their practical *** all atoms of two-dimensional(2D)nanomaterials are located on the surface,the design of surface structure is critical to determining the bulk electrochemical *** a surface-oriented property of 2D nanomaterials is well fitted to control the surface charge storage mechanism of SCs,thereby discovering emerging capacitive materials through the rational design of surface chemistry and multiscale *** Account discusses our recent progress on 2D pseudocapacitive materials for high-energyand high-power-oriented SCs applications and provides our perspective into the rational design of the microstructure,multiscale architecture,and surface *** of 2D nanomaterials include heteroatom-doped graphene,black phosphorus,transition-metal dichalcogenides,and transition-metal carbide/nitrides(MXene).We also highlight the in-depth spectroelectrochemical and computational analyses that can correlate the structures and chemistries of 2D nanomaterials with their charge storage/transport/transfer *** this Account,our design concept of 2D nanomaterials is based on two aspects of charge storage capability and kinetics that can determine the thermodynamic(capacitance)and kinetic(rate)***,chemical strategies,such as atomic incorporation,surface functionaliz

关键词： carbide microstructure kinetics

Understanding Pseudocapacitance Mechanisms by Synchrotron X-ray Analytical Techniques

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Energy & Environmental Materials 2023年第4期6卷 312-331页

作者： Pei Tang Wuyang Tan Guangyang Deng Yunting Zhang Shan Xu Qijun Wang Guosheng Li Jian Zhu qingyun dou Xingbin Yan Department of Materials Science and Engineering Sun Yat-Sen UniversityGuangzhou 510275China Center of Industrial Analysis and Testing Guangdong Academy of ScienceGuangzhou 510651China College of Materials Science and Engineering Guilin University of TechnologyGuilin 541004China

Pseudocapacitive materials that store charges via reversible surface or near-surface faradaic reactions are capable of overcoming the capacity limitations of electrical double-layer *** the structure–activity relationship between the microstructural features of pseudocapacitive materials and their electrochemical performance on the atomic scale is the key to build high-performance capacitor-type devices containing ideal pseudocapacitance ***,the high brightness(flux),and spectral and coherent nature of synchrotron X-ray analytical techniques make it a powerful tool for probing the structure–property relationship of pseudocapacitive ***,we report a comprehensive and systematic review of four typical characterization techniques(synchrotron X-ray diffraction,pair distribution function[PDF]analysis,soft X-ray absorption spectroscopy,and hard X-ray absorption spectroscopy)for the study of pseudocapacitance *** addition,we offered significant insights for understanding and identifying pseudocapacitance mechanisms(surface redox pseudocapacitance,intercalation pseudocapacitance,and the extrinsic pseudocapacitance phenomenon in battery materials)by combining in situ hard XAS and electrochemical ***,a perspective for further depth of understanding into the pseudocapacitance mechanism using synchrotron X-ray analytical techniques is proposed.

关键词： in situ experiments pseudocapacitive materials structure-property relationship synchrotron X-ray analytical techniques

Flexible planar micro supercapacitor diode

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Journal of Energy Chemistry 2024年第6期93卷 429-435,I0011页

作者： Yihui Ma Pei Tang Zhenyuan Miao Wuyang Tan Qijun Wang Yuecong Chen Guosheng Li qingyun dou Xingbin Yan Lingling Shui Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and DevicesSchool of Information and Optoelectronic Science and Engineering&South China Academy of Advanced OptoelectronicsGuangzhou 510006GuangdongChina Department of Materials Science and Engineering Sun Yat-Sen UniversityGuangzhou 510275GuangdongChina College of Materials Science and Engineering Guilin University of TechnologyGuilin 541004GuangxiChina

Supercapacitor diode is a novel ion device that performs both supercapacitor energy storage and ion diode rectification ***,previously reported devices are limited by their large size and complex *** this work,we demonstrate a screen-printed micro supercapacitor diode(MCAPode)that based on the insertion of a finger mode with spinel ZnCo_(2)O_(4) as cathode and activated carbon as anode for the first time,and featuring an excellent area specific capacitance(1.21 mF cm^(-2)at 10 mV s^(-1))and high rectification characteristics(rectification ratioⅠof 11.99 at 40 mV s^(-1)).Taking advantage of the ionic gel electrolyte,which provides excellent stability during repeated flexing and at high *** addition,MCAPode exhibits excellent electrochemical performance and rectification capability in"AND"and"OR"logic *** findings provide practical solutions for future expansion of micro supercapacitor diode applications.

关键词： Micro devices Supercapacitor diodes Screen-printing Rectification Logic gates

Electronically coupled layered double hydroxide/MXene quantum dot metallic hybrids for high-performance flexible zinc–air batteries

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InfoMat 2021年第10期3卷 1134-1144页

作者： Xiaotong Han Nannan Li Peixun Xiong Min Gyu Jung Yingbo Kang qingyun dou Qing Liu Jin Yong Lee Ho Seok Park School of Chemical Engineering Sungkyunkwan University(SKKU)SuwonRepublic of Korea Department of Chemistry Institute of Basic ScienceSungkyunkwan UniversitySuwonRepublic of Korea Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences and Technology(SAIHST)Sungkyunkwan UniversitySuwonRepublic of Korea

Precise control of the local electronic structure and properties of electrocatalysts is important for enhancing the multifunctionality and durability of electrocatalysts and for correlating the structure/chemistry with the catalytic ***,we report electronically coupled metallic hybrids of NiFe layered double hydroxide nanosheet/Ti3C2 MXene quantum dots deposited on a nitrogen-doped graphene surface(LDH/MQD/NG)for high-performance flexible Zn-air batteries(ZABs).As verified from the Mott-Schottky and Nyquist plots,as well as spectroscopic,electrochemical,and computational analyses,the electronic and chemical coupling of LDH/MQD/NG modulates the local electronic and surface structure of the active LDH to provide metallic conductivity and abundant active sites,leading to significantly improved bifunctional activity and electrocatalytic *** rechargeable ZABs with LDH/MQD/NG hybrids are superior to the previous LDH-based ZABs,demonstrating a high power density(113.8 mW cm^(-2))and excellent cycle stability(150 h at 5 mA cm^(-2)).Moreover,the corresponding quasi solid-state ZABs are completely flexible and practical,affording a high power density of 57.6 mW cm^(-2)even in the bent state,and in real-life operation of tandem cells for powering various electronic devices.

关键词： 2D quantum dots flexible battery metallic hybrids oxygen electrochemistry Zn-air battery

A lithium-air capacitor-battery based on a single electrolyte-double cathode structure

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Science China Chemistry 2024年

作者： Chuyi Zhong Jingke Yang Yining Lao Yandong Xie Shuaiqi Li Ming Jin Pei Tang Jian Zhu qingyun dou Xingbin Yan School of Materials Science and Engineering Sun Yat-sen University South China Academy of Advanced Optoelectronics South China Normal University School of Chemistry Sun Yat-sen University

Lithium-air capacitor-battery （LACB） is a novel electrochemical energy storage device that integrates the fast charging-anddischarging function of a supercapacitor into a conventional lithium-air battery （LAB）,thereby gaining a substantial increase in power density compared to the lithium-air ***,its development is severely limited by the complex dual-electrolyte and dual-atmosphere construction used in the reported ***,we present a prototype lithium-air capacitor-battery with an exceptionally simplified single electrolyte and double-cathode （an air electrode and a capacitor electrode） structure under one gas *** particular,the ingenious introduction of an oxygen-barrier film between the two cathodes allows the device to exhibit reliable and rapid conversion between high energy and high power by controlling current *** obtained cathode delivers a large full capacity of 16.9 mAh cm-2and it also exhibits excellent cycle stability for stable operation up to 5,500 laps at a fixed capacity of 0.1 mAh cm-2at the current density of 2 mA *** addition,the LACB has a self-charging *** work puts forward a new construction strategy for LACB systems,which is conducive to their rapid development.

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