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supercapacitors as redox mediators for decoupled water splitting

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Chinese Chemical Letters 2023年第2期34卷 481-484页

作者： Mingrui Guo Jing Zhan Zekun Wang Xiaorui Wang Zhang Dai Ting Wang College of Chemistry and Chemical Engineering Institute for Sustainable Energy and ResourcesQingdao UniversityQingdao 266071China National Engineering Research Center for Colloidal Materials School of Chemistry and Chemical EngineeringShandong UniversityJi'nan 250100China Shandong Shengtong Optical Materials Technology Co. Ltd.Dongying 257500China

With the help of the redox mediator, decoupled water-splitting allows O_(2)and H_(2)to be produced at different times, at different rates, and even in different cells, which promotes both the operation safety and the utilization of renewable power sources. However, the current densities and stabilities of these redox mediators are commonly low, which require further improvements for practical applications. Here, we propose to use supercapacitors as solid state redox mediators for decoupled water splitting. For demonstration, Na_(0.5)MnO_(2)(pseudocapacitor) and active carbon(double layer capacitor), are both used as the redox mediator. These supercapacitors show superior current density(1 A/cm^(2)) and ultralong cycle-life(8000 cycles) compared with commonly investigated battery-based mediators(NiOOH/Ni(OH)_(2)). Our research proves supercapacitors can be used as redox relay with high current density and stability, which may bring new insights in the design of decoupled water splitting systems.

关键词： Decoupled water splitting Redox mediators supercapacitors High current density Ultralong cycle-life

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

Machine learning techniques for prediction of capacitance and remaining useful life of supercapacitors: A comprehensive review

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Journal of Energy Chemistry 2023年第2期77卷 438-451,I0011页

作者： Vaishali Sawant Rashmi Deshmukh Chetan Awati Department of Technology Shivaji UniversityKolhapurMaharashtraIndia

supercapacitors are appealing energy storage devices for their promising features like high power density,outstanding cycling stability,and a quick charge–discharge *** exceptional life cycle and ultimate power capability of supercapacitors are needed in the transportation and renewable energy generation ***,predicting the capacitance and lifecycle of supercapacitors is significant for selecting the suitable material and planning replacement intervals for *** addition,system failures can be better addressed by accurately forecasting the lifecycle of ***,the use of machine learning for performance prediction of energy storage materials has drawn increasing attention from researchers globally because of its superiority in prediction accuracy,time efficiency,and *** article presents a detailed review of the progress and advancement of ML techniques for the prediction of capacitance and remaining useful life(RUL)of *** review starts with an introduction to supercapacitor materials and ML applications in energy storage devices,followed by workflow for ML model building for supercapacitor ***,the summary of machine learning applications for the prediction of capacitance and RUL of different supercapacitor materials including EDLCs(carbon based materials),pesudocapacitive(oxides and composites)and hybrid materials is ***,the general perspective for future directions is also presented.

关键词： supercapacitors Energy storage materials Artificial neural network Machine learning Capacitance prediction Remaining useful life

An Ultra-microporous Carbon Material Boosting Integrated Capacitance for Cellulose-Based supercapacitors

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Nano-Micro Letters 2020年第5期12卷 78-94页

作者： Chenfeng Ding Tianyi Liu Xiaodong Yan Lingbo Huang Seungkon Ryu Jinle Lan Yunhua Yu Wei?Hong Zhong Xiaoping Yang State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029People’s Republic of China Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122JiangsuPeople’s Republic of China Institute of Carbon Tech. Jeonju UniversityJeonju 55069South Korea School of Mechanical and Material Engineering Washington State UniversityPullman 99163USA

A breakthrough in advancing power density and stability of carbon-based supercapacitors is trapped by inefficient pore structures of electrode ***,an ultramicroporous carbon with ultrahigh integrated capacitance fabricated via one-step carbonization/activation of dense bacterial cellulose(BC)precursor followed by nitrogen/sulfur dual doping is *** microporous carbon possesses highly concentrated micropores(~2 nm)and a considerable amount of sub-micropores(<1 nm).The unique porous structure provides high specific surface area(1554 m^2 g^-1)and packing density(1.18 g cm^-3).The synergistic effects from the particular porous structure and optimal doping effectively enhance ion storage and ion/electron *** a result,the remarkable specific capacitances,including ultrahigh gravimetric and volumetric capacitances(430 F g^-1 and 507 F cm^-3 at 0.5 A g^-1),and excellent cycling and rate stability even at a high current density of 10 A g^-1(327 F g^-1 and 385 F cm^-3)are *** compositing the porous carbon and BC skeleton,a robust all-solid-state cellulose-based supercapacitor presents super high areal energy density(~0.77 mWh cm^-2),volumetric energy density(~17.8 W L^-1),and excellent cyclic stability.

关键词： Integrated capacitance Bacterial cellulose Microporous carbon Heteroatom doping supercapacitors

Bipolar ionomer electrolytes with desirable self-discharge suppression for supercapacitors

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Journal of Energy Chemistry 2023年第3期78卷 422-429,I0012页

作者： Wenqiang Wang Qingyun Zeng Ruoyu Wang Gengchao Wang Chunzhong Li Shanghai Engineering Research Center of Hierarchical Nanomaterials Shanghai Key Laboratory of Advanced Polymeric MaterialsSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China Shanghai Engineering Research Center of Hierarchical Nanomaterials School of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China

supercapacitors based on electric double layers are prone to serious self-discharge due to electrolyte ion desorption and the resulting energy loss severely limits the application range of *** design of polymer electrolyte systems to address this problem shows considerable generality and high ***,we reported a quasi-solid-state bipolar ionomer electrolyte prepared by an in-situ layer-by-layer ultraviolet-curing method,which has an integrated Janus structure with an intermediate binding *** on the synergistic effect of confining impurity ions by ionizable groups and electrostatic repulsion to stabilize the electric double layers and superimposing synergies on both sides,the assembled device not only possesses ideal supercapacitor characteristics,but also exhibits an ultrahigh voltage retention of 71% after being left to stand for 100 h after being fully ***,through the quasi-in-situ energy dispersive X-ray spectroscopy linear scanning,the characteristics of ion diffusion in this ionomer electrolyte are revealed,suggesting its correlation with self-discharge behavior.

关键词： Bipolar membrane Ionomer electrolyte supercapacitors Self-discharge

Hierarchical Ni-Co-S@Ni-W-O core-shell nanosheet arrays on nickel foam for high-performance asymmetric supercapacitors

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Nano Research 2018年第3期11卷 1415-1425页

作者： Weidong He Zhifu Liang Keyu ji Qingfeng Sun Tianyou Zhai Xijin Xu School of Physics and Technology University of Jinan 336 West Road of Nan Xinzhuang Jinan 250022 China State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology (HUST) Wuhan 430074 China School of Engineering Zhejiang A & F University Hangzhou 311300 China

Nickel cobalt sulfides （Ni-Co-S） have attracted extensive attention for application in electronic devices owing to their excellent conductivity and high electrochemical capacitance. To facilitate the large-scale practical application of Ni-Co-S, the excellent rate capability and cyclic stability of these compounds must be fully exploited. Thus, hierarchical Ni-Co-S@Ni-W-O （Ni-Co-S-W） core/shell hybrid nanosheet arrays on nickel foam were designed and synthesized herein via a facile three-step hydrothermal method, followed by annealing in a tubular furnace under argon atmosphere. The hybrid structure was directly assembled as a free-standing electrode, which exhibited a high specific capacitance of 1,988 F·g^-1 at 2 A·g^-1 and retained an excellent capacitance of approximately 1,500 F·g^-1 at 30 A·g^-1, which is superior to the performance of the pristine Ni-Co-S nanosheet electrode. The assembled asymmetric supercapacitors achieved high specific capacitance （155 F·g^-1 at 1 A·g^-1）, electrochemical stability, and a high energy density of 55.1 W·h·kg^-1 at a power density of 799.8 W·kg^-1 with the optimized Ni-Co-S-W core/shell nanosheets as the positive electrode, activated carbon as the negative electrode, and 6 M KOH as the electrolyte.

关键词： core/shell structure free-standing electrode supercapacitors high energy density excellent stability

A Molecular Foaming and Activation Strategy to Porous N-Doped Carbon Foams for supercapacitors and CO2 Capture

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Nano-Micro Letters 2020年第5期12卷 1-19页

作者： Mengyuan Zhou Yaqian Lin Huayao Xia Xiangru Wei Yan Yao Xiaoning Wang Zhangxiong Wu Particle Engineering Laboratory(CPCIA)and Suzhou Key Laboratory of Green Chemical Engineering School of Chemical and Environmental EngineeringCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 2151213JiangsuPeople’s Republic of China

Hierarchically porous carbon materials are promising for energy storage,separation and *** is desirable but fairly challenging to simultaneously create ultrahigh surface areas,large pore volumes and high N contents in these ***,we demonstrate a facile acid-base enabled in situ molecular foaming and activation strategy for the synthesis of hierarchically macro-/meso-/microporous N-doped carbon foams(HPNCFs).The key design for the synthesis is the selection of histidine(His)and potassium bicarbonate(PBC)to allow the formation of 3D foam structures by in situ foaming,the PBC/His acid-base reaction to enable a molecular mixing and subsequent a uniform chemical activation,and the stable imidazole moiety in His to sustain high N contents after *** formation mechanism of the HPNCFs is studied in *** prepared HPNCFs possess 3D macroporous frameworks with thin well-graphitized carbon walls,ultrahigh surface areas(up to 3200 m^2 g^-1),large pore volumes(up to 2.0 cm^3 g^-1),high micropore volumes(up to 0.67 cm^3 g^-1),narrowly distributed micropores and mesopores and high N contents(up to 14.6 wt%)with pyrrolic N as the predominant N *** HPNCFs are promising for supercapacitors with high specific capacitances(185-240 F g^-1),good rate capability and excellent *** are also excellent for CO2 capture with a high adsorption capacity(~4.13 mmol g^-1),a large isosteric heat of adsorption(26.5 kJ mol^-1)and an excellent CO2/N2 selectivity(~24).

关键词： Porous carbon foams Hierarchical pore structure Nitrogen doping supercapacitors CO2 capture

Role of transition metal oxides in g-C_(3)N_(4)-based heterojunctions for photocatalysis and supercapacitors

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Journal of Energy Chemistry 2022年第1期31卷 214-235,I0007页

作者： Liqi Bai Hongwei Huang Shixin Yu Deyang Zhang Haitao Huang Yihe Zhang Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes.School of Materials Science and Technology China University of GeosciencesBeijing 100083China Department of Physics&Department of Materials Science and Engineering City University of Hong KongTat Chee AvenueKowloonHong KongChina Key Laboratory of Microelectronics and Energy of Henan Province Henan Joint International Research Laboratory of New Energy Storage TechnologySchool of Physics and Electronic EngineeringXinyang Normal UniversityXinyang 464000HenanChina Department of Applied Physics and Research Institute for Smart Energy The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

g-C_(3)N_(4) emerges as a star 2D photocatalyst due to its unique layered structure,suitable band structure and low ***,its photocatalytic application is limited by the fast charge recombination and low *** designing g-C_(3)N_(4)-based heterojunction is promising for improving photocatalytic ***,g-C_(3)N_(4) exhibits great potentials in electrochemical energy *** view of the excellent performance of typical transition metal oxides(TMOs)in photocatalysis and energy storage,this review summarized the advances of TMOs/g-C_(3)N_(4) heterojunctions in the above two ***,we introduce several typical TMOs based on their crystal structures and band ***,we summarize different kinds of TMOs/g-C_(3)N_(4) heterojunctions,including type Ⅰ/Ⅱ heterojunction,Z-scheme,p-n junction and Schottky junction,with diverse photocatalytic applications(pollutant degradation,water splitting,CO_(2) reduction and N_(2) fixation)and supercapacitive energy ***,some promising strategies for improving the performance of TMOs/g-C_(3)N_(4) were ***,the exploration of photocatalysis-assisted supercapacitors was discussed.

关键词： Transition metal oxides Carbon nitride Heterojunction Photocatalysis supercapacitors

Wet-spun poly(ionic liquid)-graphene hybrid fibers for high performance all-solid-state flexible supercapacitors

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Journal of Energy Chemistry 2019年第7期28卷 104-110页

作者： Karthikeyan Gopalsamy Qiuyan Yang Shengying Cai Tieqi Huang Zhengguo Gao Chao Gao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Key Laboratory of Adsorption and Separation Materials and Technologies of Zhejiang Province Zhejiang University

It is crucial to develop flexible and wearable electronic devices that have attracted tremendous interest due to their merits on compactness,flexibility and high capacitive *** we report the continuously ordered macroscopic poly(ionic liquid)-graphene fibers by wet spinning method via liquid crystal assembly for supercapacitor *** fabricated all-solid-state supercapacitors exhibited a high areal capacitance(268.2 mF cm 2)and volumetric capacitance(204.6 F cm 3)with an outstanding areal energy density(9.31μWh cm-2)and volumetric energy density(8.28 mWh cm-3).The fiber supercapacitors demonstrated exceptional cycle life for straight electrodes of about 10,000 cycles(94.2%capacitance retention)and flexibility at different angles(0°,45°,90°,180°)along with a good flexible cycling stability after 6000 cycles(92.7%capacitance retention).To date,such a novel poly(ionic liquid)-graphene fiber supercapacitors would be a new platform in real-time flexible electronics.

关键词： Graphene fiber Poly(ionic liquid) Wet spinning supercapacitors Flexibility