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Novel hierarchical yolk-shell α-Ni(OH)_(2)/Mn_(2)O_(3) microspheres as high specific capacitance electrode materials for supercapacitors

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Frontiers of Chemical Science and Engineering 2021年第5期15卷 1322-1331页

作者： Xiqing Luo Miaomiao Jiang Kun Shi Zhangxian Chen Zeheng Yang Weixin Zhang School of Chemistry and Chemical Engineering Hefei University of Technology and Anhui Key Laboratory of Controllable Chemical Reaction&Material Chemical EngineeringHefei230009China

For high performance supercapacitors, novel hierarchical yolk-shell α-Ni(OH)_(2)/Mn_(2)O_(3) microspheres were controllably synthesized using a facile two-step method based on the solvothermal treatment. The unique α-Ni(OH)_(2) based yolk-shell microstructures decorated with numerous interconnected nanosheets and the heterocomposition features can synergistically enhance reactive site exposure and electron conduction within the microspheres, facilitate charge transfer between electrolyte and electrode materials, and release structural stress during OH− chemisorption/desorption. Moreover, the Mn2O3 sediments distributed over the α-Ni(OH)_(2) microspheres can serve as an effective protective layer for electrochemical reactions. Consequently, when tested in 1 mol·L^(−1) KOH aqueous electrolyte for supercapacitors, the yolk-shell α-Ni (OH)_(2)/Mn_(2)O_(3) microspheres exhibited a considerably high specific capacitance of 2228.6 F·g^(−1) at 1 A·g^(−1) and an impressive capacitance retention of 77.7% after 3000 cycles at 10 A·g^(−1). The proposed α-Ni(OH)_(2)/Mn_(2)O_(3) microspheres with hetero-composition and unique hierarchical yolk-shell microstructures are highly promising to be used as electrode materials in supercapacitors and other energy storage devices.

关键词： α-Ni(OH)_(2)/Mn_(2)O_(3) yolk-shell microspheres electrode material high specific capacitance supercapacitors

Facile synthesis of polypyrrole nanowires for high-performance supercapacitor electrode materials

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Progress in Natural Science:materials International 2016年第3期26卷 237-242页

作者： Junhong Zhao Jinping Wu Bing Li Weimin Du Qingli Huang Mingbo Zheng Huaiguo Xue Huan Pang College of Chemistry and Chemical Engineering Anyang Normal University College of Chemistry and Chemical Engineering Yangzhou University

Polypyrrole nanowires are facile synthesized under a mild condition with FeClas an oxidant. Polypyrrole nanowires with the width of 120 nm form many nanogaps or pores due to the intertwined nanostructures. More importantly, PPy nanowires were further applied for supercapacitor electrode *** electrochemical testing, it was observed that the PPy nanowire based electrode showed a large specific capacitance(420 Fg, 1.5 Ag) and good rate capability(272 Fg, 18.0 Ag), which is larger than that of most of published results. The as-prepared electrode can work well even after 8000 cycles at 1.5 Ag.

关键词： Polypyrrole Nanowire Supercapacitor electrode material

Application of covalent organic frameworks as electrode materials for supercapacitors

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ChemPhysMater 2024年第4期3卷 388-414页

作者： Yanmin Wan Baoshou Shen Xiaoli Zhu Zhongming Guo Institute of Earth Surface System and Hazards College of Urban and Environmental SciencesNorthwest UniversityXi’an 710127China Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity Xi’an 710127China

Supercapacitors have garnered significant attention due to their superior power density,excellent cycle stability,and fast charge/discharge *** properties of the electrode materials determine the charge storage performance of *** organic frameworks(COFs)are a novel class of crystalline porous polymer materials with uniform nanoscale pores,large specific surface areas,and tunable redox-active groups within the framework,which can be tuned to suit specific *** have flexible molecular designs and synthetic strategies,demonstrating their strong application potential in the field of energy *** COFs exhibit poor inherent conductivity and low utilization of active sites,resulting in incomplete electrochemical *** systems can be developed by incorporating redox-active groups,hydrogen bonding,or combining COFs with other materials to improve the energy storage performance of COFs *** this review article,the background of COFs is summarized,including a brief introduction,design strategy,and synthesis *** also discusses their applications in supercapacitors and is categorized into:pristine COFs,modified COFs,and COF matrix ***,the review addresses the challenges that remain for the practical application of these materials in supercapacitors.

关键词： COFs material Supercapacitor electrode material Modification

A bird nest-like manganese dioxide and its application as electrode in supercapacitors

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Journal of Energy Chemistry 2013年第6期22卷 928-934页

作者： Fen Ran Huili Fan Lingren Wang Lei Zhao Yongtao Tan Xuanxuan Zhang Lingbin Kong Long Kang State Key Laboratory of Gansu Advanced Non-Ferrous Metal materials Lanzhou University of Technology Key Laboratory of Non-ferrous Metal Alloys and Processing of Ministry of Education Lanzhou University of Technology

A novel bird nest-like nanostructured MnO2(BNNS-MnO2) was prepared by a facile and cost-effective strategy. Their structures and morphologies were characterized by field emission scanning electron microscopy, transmission electron microscopy and powder X-ray diffraction. Capacitive behaviors were investigated by cyclic voltammetry and galvanostatic charge-discharge. The obtained nano-MnO2 possesses a well designed loose-assembled hierarchical nanoarchitecture with an appropriate crystallinity which gives rise to excellent performances as an electrode material for supercapacitors. A maximum specific capacitance of 917 F/g has been obtained at a current density of 5 mA/cm2 in 6 mol/L KOH aqueous solution, and a specific capacitance of 210 F/g has been maintained for 500 cycles. As the low cost of MnSO4 and KCr2O7 and the low reaction temperature, the present method avoids the requirements for complicated operations, time/energy-consuming and expensive reagents, and perhaps is ready for the industrialization of nano-MnO2 production.

关键词： energy storage nanostructured MnO2 supercapacitors electrochemical performance electrode material

The Preparation of Nickel Cobalt Oxide electrode materials and Investigation of Their Super Capacitor Properties

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The Preparation of Nickel Cobalt Oxide Electrode Materials a...

Improving Electrochemical Performance of Cellulose Fiber-based Supercapacitor electrode Using Polypyrrole-wrapped Iron Oxyhydroxide

河南省化学会2018年学术年会

作者： Wang Yina Du Jimin College of Chemistry and Chemical Engineering Anyang Normal University

In this paper,CoCl·6HO,NiCl·6HO and CHNO were used as raw materials to synthesize CoNiO/CC material with adding different surfactants by hydrothermal synthesis *** its electrochemical performance as electrode material of supercapacitor was *** morphology,structure,elemental distribution,elemental valence,electrochemical properties were characterized through cold field emission scanning electron microscope(SEM),X-ray energy dispersive spectroscopy(EDX),X-ray powder diffractometer(XRD),X-ray photoelectron spectroscopy(XPS),electrochemical *** experimental results show that the electrochemical performance of the CoNiO/CC sample with PEG surfactant is the *** the current density of 1 m A/cm,the specific capacitance reaches up to 1.5010 F/*** 2000cycles of charge and discharge,the capacitance is 73.4%of the initial capacitance,reflecting its good cycle stability.

关键词： hydration heat cobalt nickel oxide electrode material carbon cloth supercapacitor

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Paper And Biomaterials 2021年第3期6卷 10-19页

作者： Youngchu Kang Hailan Jin Xianhui An Xueren Qian Key Laboratory of Bio-based material Science&Technology(Northeast Forestry University)Ministry of Education HarbinHeilongjiang Province150040China

Polypyrrole(PPy)@cellulose fiber-based composites have been widely investigated as electrode materials for use in flexible ***,they cannot readily provide high specific capacitance and cyclic stability owing to their inherent drawbacks,such as high resistance,Weber impedance,and volume expansion or collapse during charging/*** this study,iron oxyhydroxide(FeOOH)is incorporated in the abovementioned composite to decrease the equivalent series resistance,charge transfer resistance,and Weber impedance,thereby enhancing electron transfer and ion diffusion,which results in superior electrochemical *** PPy-wrapped FeOOH@cellulose fiber-based composite electrode with the molar ratio of FeSO_(4) to NaBH4 of 1∶1 exhibits a high specific capacitance of 513.8 F/g at a current density of 0.2 A/g,as well as an excellent capacitance retention of 89.4% after 1000 cycles.

关键词： cellulose fibers iron oxyhydroxide polypyrrole electrode material electrochemical performance

Iron-induced 3D nanoporous iron-cobalt oxyhydroxide on carbon cloth as a highly efficient electrode for oxygen evolution reaction

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Chinese Journal of Catalysis 2019年第10期40卷 1540-1547页

作者： Guodong Chen Jian Du Xilong Wang Xiaoyue Shi Zonghua Wang Han-Pu Liang College of Chemistry and Chemical Engineering Shandong Sino-Japanese Center for Collaborative Research of Carbon NanomaterialsQingdao UniversityQingdao 266071ShandongChina Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of SciencesQingdao 266101Shandong China Center of materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

The development of highly efficient and cost-effective electrode materials for catalyzing the oxygen evolution reaction(OER)is crucial for water splitting *** increase in the number of active sites by tuning the morphology and structure and the enhancement of the reactivity of active sites by the incorporation of other components are the two main strategies for the enhancement of their catalytic *** this study,by combining these two strategies,a unique three-dimensional nanoporous Fe-Co oxyhydroxide layer coated on the carbon cloth(3D-FeCoOOH/CC)was successfully synthesized by in situ electro-oxidation methods,and directly used as a working *** electrode,3D-FeCoOOH/CC,was obtained by the Fe doping process in(NH4)2Fe(SO4)2,followed by continuous in situ electro-oxidization in alkaline medium of“micro go chess piece”arrays on the carbon cloth(MCPAs/CC).Micro characterizations illustrated that the go pieces of MCPAs/CC were completely converted into a thin conformal coating on the carbon cloth *** electrochemical test results showed that the as-synthesized 3D-FeCoOOH/CC exhibited enhanced activity for OER with a low overpotential of 259 mV,at a current density of 10 mA cm^–2,and a small Tafel slope of 34.9 mV dec^–1,as well as superior stability in 1.0 mol L^–1 KOH *** extensive analysis revealed that the improved electrochemical surface area,conductivity,Fe-Co bimetallic composition,and the unique 3D porous structure together contributed to the enhanced OER activity of 3D-FeCoOOH/***,the synthetic strategy applied in this study could be extended to fabricate a series of Co-based electrode materials with the dopant of other transition elements.

关键词： 3D nanoporous iron-cobalt oxyhydroxide layer Micro go chess piece arrays electrode material Electro-oxidation Oxygen evolution reaction

A dual redox-active and robust polymer enables ultrafast and durable proton-storage capability

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Journal of Energy Chemistry 2024年第11期98卷 237-243页

作者： Jiachen Yang Jing Jin Peipei Zhang Xinyue Zhang Jun Yang Junwei Lang Minjie Shi School of materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuChina Research Center of Resource Chemistry and Energy materials Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000GansuChina Jiangsu New Yangzi Shipbuilding Co.Ltd Jingjiang 214532JiangsuChina

Aqueous proton batteries(APBs) offer a viable and attractive option in the field of affordable and sustainable energy *** polymers are highly favored due to their environmentally friendly manufacturability and malleable molecular configurations,making them suitable materials for constructing APB ***,their currently limited capacity for proton-associated redox reactions poses a challenge to the widespread ***,we have developed a highly redox-active organic polymer(PTA) tailored for APB *** inclusion of dual redox-active moieties in the extended nconjugated frameworks not only enhances the redox activity and refines the electronic properties,but also ensures the high structural integrity of the PTA *** used as an electrode,the PTA polymer has a notable ability to store protons,with a large capacity of 213.99 mA h g^(-1) at 1 A g^(-1) and exceptional long-term stability,as evidenced by retaining 94.6% of its initial capacity after 20,000 *** situ techniques alongside theoretical calculations have unveiled efficient redox processes occurring at C=N and C=O redox-active sites within the PTA electrode upon proton uptake/***,a softpackage APB device has been assembled with impressive electrochemical behaviors and excellent operational lifespan,accentuating its significant promise for real-world deployment.

关键词： Aqueous battery electrode material Organic polymer Electrochemical mechanism Proton storage

Multifunctional carbon materials from rugose rose for energy storage and water purification

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Frontiers of Chemical Science and Engineering 2024年第9期18卷 1-13页

作者： Peng-Hui Li Hui Zhou Wen-Juan Wu Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing Forestry UniversityNanjing 210037China College of Light Industry and Food Engineering Nanjing Forestry UniversityNanjing 210037China College of Chemical Engineering East China University of Science and TechnologyShanghai 200237China State Key Laboratory of Chemical Engineering Shanghai 200237China

With the advancement of social process,the resource problem is becoming more prominent,biomass materials come into being,and it is becoming more and more important to explore and prepare efficient and multifunctional biomass materials to alleviate the problems of energy storage and water *** this paper,nitrogen-doped hierarchical porous carbon materials(NRRC)were produced by one-step carbonization of withered rose as raw material and melamine as nitrogen source with KOH-activated *** resulting nitrogen-doped porous carbon material had the most abundant pores and the best microspherical graded pore structure,with a specific surface area of up to 1393 m2·g^(-1),a pore volume of 0.68 cm3·g^(-1),and a nitrogen-doped content of 5.52%.Electrochemical tests showed that the maximum specific capacitance of NRRC in the three-electrode system was 346.4 F·g^(-1)(0.5 A·g^(-1)),which was combined with favorable capacitance retention performance and cycling *** NRRC//NRRC symmetric supercapacitors were further assembled,and the maximum energy density of a single device was 23.88 Wh·kg^(-1),which still maintains excellent capacitance retention and cyclic charging/discharging *** example,the capacitance retention rate was always close to 96.27%with almost negligible capacitance loss after 10000 consecutive charge/discharge cycles(current density:10 A·g^(-1)).Regardless of the three-electrode or two-electrode system,the super capacitive performance of NRRC porous carbon materials was comparable to the electrochemical performance of many reported biomass porous carbon materials,which showed better energy storage advantages and practical application *** addition,NRRC porous carbon materials had excellent water purification *** dye adsorption test confirmed that NRRC had a high adsorption capacity(491.47 mg·g^(-1))for methylene *** undoubtedly also showed a potential and promising avenue for high value-added utilization

关键词： rose carbon adsorption electrode material electrochemical performance