JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Liqianyun Xu,Liuyang Zhang,Bei Cheng,Jiaguo Yu,Ahmed A. Al-Ghamdi,S. Wageh
Poor conductivity and rate capability are the obstacles faced by nickel-cobalt composites as electrode materials for supercapacitor application. Herein, simple electrochemical treatment conducted by cyclic voltammetry is applied and the overall performance of the active material is considerably enhanced. We discover that this treatment triggers the formation of Ni-Co-Cu ternary composite and optimizes the crystal structure of the untreated counterpart. The areal capacitance of the treated sample rockets up to 6.13 F cm −2 at 2 mA cm −2 , almost 13 times higher than the untreated ones. Besides, the resistance is substantially reduced by cyclic voltammetry treatment. Moreover, the Coulombic efficiency and stability are concurrently elevated. The reasons behind this treatment are mulled over and reasonable hypothesis is suggested. This study provides a cheap and effortless way to reform the structures of as-obtained samples as well as vigorously raise the performance of current available materials.
研究领域:
材料科学
·
电化学
·
纳米材料
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能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Yifan Zhang,Laifu Yang,Wenqiang Wang,Gengchao Wang
LiNbO 3 is an intercalation material with high theoretical specific capacity, which is promising for lithium-ion capacitor (LIC) anode. However, the poor charge transfer dynamics makes LiNbO 3 unable to match the capacitive cathode in rate performance and cycle stability, resulting in poor electrochemical performance of the device. Herein, through the integrated process of in-situ nitrogen-doping with polypyrrole as the nitrogen source and hydrothermal deposition, the coaxial heterostructure of ultrafine LiNbO 3 nanoparticles and nitrogen-doped carbon nanotubes (NCNT) was realized. The large lithium-ion accessible surface and the bonding with the conductive channel significantly enhance the pseudocapacitive behavior of LiNbO 3 (capacitance contribution of 78.5% at 1 mV s −1 ). After 1000 cycles at a current density of 2 A g −1 , NCNT@LiNbO 3 still has a specific capacity of 154.9 mAh g −1 (89.8%). Thus, the assembled NCNT@LiNbO 3 //AC devices can charge and discharge up to 10000 cycles at a current density of 2 A g −1 , and the capacity retention rate can still reach 90.3%, and can provide an energy density of 142 Wh kg −1 . This work provides ideas for the interface and structure design of nanocomposite electrode materials.
研究领域:
材料科学
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电化学
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纳米复合材料
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能源存储
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界面工程
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电极设计
✓ 已验证
DOI
高影响因子
Results in Physics
·
2020
·
IF 4.019
Zhengwei Xiong,Jiang Yang,Zhipeng Gao,Qiang Yang,Deli Shi
As a typical supercapacitor electrode material, the reported Mo-N compounds mostly own one part of outstanding electrochemical properties (specific capacitance (C sp ), voltage window and cycling stability), and the well integration with three aspects was rare. Here using a novel MoO 3 precursor with ultra-long nanobelts (NBs) and stable orthorhombic crystal structure, we prepared unique Mo 3 N 2 NBs, which inherited the morphology and structure of the precursor greatly. Compared with other Mo-N compounds, the Mo 3 N 2 NBs both possessed the high C sp (220.3 F/g at 0.4 A/g), great cycling stability (98.3% C sp retention after 1500 cycles) and wide voltage window (0.95 V) due to the improved morphology, stable structure and excellent conductivity.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Chong Chen,Jiacan Shao,Shaojie Qu,Li Xie,Wenjian Jiang,Keying Zhang,Xin Zhuo,Hongwei Shi,Hongyan Wang,Li Sun,Li Zhang,Guang Zhu
Hollow carbon nanosheets with predominant mesopores have been demonstrated as a promising electrode material for supercapacitor , but their low specific surface area with relatively low micropore proportion limits their specific capacitance and energy density . Herein, we develop a novel extrusion plant microtube strategy to synthesize micron-sized nitrogen-doped hollow porous carbon nanosheets (MNHPCS) from dandelion fluff having the specific natural thin-wall and hollow tubular bundled structure through high-pressure extrusion, carbonization and KOH activation. The optimized MNHPCS displays strutted bilayer nanosheet structure, large SSA of 1593 m 2 g −1 , high micoporosity of 71.2 % and high heteroatom content (5.2 at.% for N, 7.0 at.% for O). Importantly, MNHPCS prepared by the new technique overcomes the drawbacks of hollow carbon nanosheets and presents an excellent capacitance of 378 F g −1 at 0.5 A g −1 and rate capability of 57 % at 80 A g −1 in 6 M KOH. Furthermore, the energy density of MNHPCS//MNHPCS based supercapacitor in EMIMBF 4 can reach up to 84 Wh kg −1 . Most importantly, MNHPCS can be easily achieved from various plant wastes having hollow tubular structure, which would provide a clearly method on selecting plant precursors for producing hollow porous carbon nanosheets applied on supercapacitors.
研究领域:
材料科学
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纳米技术
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电化学
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能源存储
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功能材料
✓ 已验证
DOI
高影响因子
Sustainable Energy & Fuels
·
2023
·Vol. 8
·期 2
·358-368
·
IF 5.6
Hai Lu,Peichun Wang,Yitian Ma,Meng Liu,Linqing Chang,Rui Feng,Shuliang Luo,Zhiyun Zhang,Yi Wang,Yan Yuan
In this study, quasi-solid polymer electrolytes incorporating an ionic liquid (ILQSEs) fabricated in different organic solvents via a thermally-initiated polymerization strategy were investigated for flexible supercapacitors (SCs). It was found that low-viscous acetonitrile (AN) with a strongly-polar nitrile group was remained in the polymer matrix, which favored a higher ionic conductivity, wider electrochemical window, and better thermal stability of the ILQSE compared to its propylene carbonate (PC) counterpart. Moreover, the in situ polymerized quasi-solid electrolyte achieved close contact with the porous carbon electrode, accompanied by the favorable permeation of the IL into the electrode for enhancing the ion-transport kinetics and interface stability. Consequently, the as-assembled SC with the AN-based ILQSE delivered a high specific energy and specific power, excellent cycle stability, and reliable safety.
研究领域:
材料科学
·
电化学
·
高分子化学
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能源存储
·
纳米科技
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 47
·期 14
·20310-20316
·
IF 4.527
Yang Yan,Linlin Zang,Tianwei Dou,Haicheng Li,Liguo Sun,Yanhong Zhang
In this work, we prepared a hollow Co 3 O 4 nanoparticles (NPs) immobilized reduced graphene oxide (rGO)/carbon monolith (HCGCM) via a one-step carbonization method. The doping of nanomaterial and transition metal oxide can improve the poor conductivity and low capacitance of pure carbonaceous materials. The optimal addition concentration of polystyrene microspheres as a template provided the HCGCM composite with a hierarchical pore structure and a large specific surface area (1600 cm 2 /g), which is conducive to generating sufficient electroactive sites. At the same time, three dimensional (3D) interconnected pores shorten ion transport paths and reduced diffusion resistance of ions. Due to the existence of pseudocapacitive behavior, the HCGCM composite, as an electrode material working in a three-electrode system, achieved a high capacitance value of 1106 F/g at a current density of 1 A/g. In two-electrode system, the asymmetric supercapacitor had excellent stability performance and remained about 86.7% capacitance after 5000 cycles test. Moreover, it also exhibited a maximum energy density of 66.7 Wh/kg at power density of 750 W/kg. Thus, the strategy of manufacturing 3D porous electrodes is beneficial to improve the overall electrochemical performance of supercapacitors .
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Zuocheng Luo,Qingfeng Zhang,Wei Xie,Tong Yuan,Qisheng Zang,Ning Wang,Hanxiao Fan,Shuhong Xie,Xiaoping Ouyang
Potassium ion hybrid capacitors (PIHCs) have attracted widespread attention as combining the advantages of potassium ion batteries (PIBs) with supercapacitors . However, the sluggish kinetics caused by the large radius of K + hinder the practical application of PIHCs. Herein, we synthesized a boron and fluorine co-doping interlaced network porous carbon nanofibers (BF-PCNFs), which was used as the freestanding anode of PIHCs the freestanding anode of PIHCs to alleviate large volume expansion and increase conductivity. Benefiting from the B, F co-doping and porous interlace nanostructure of BF-PCNFs, the anode shows 185 mA h g −1 under a load of 12.6 mg cm −2 , a reversible capacity of 176 mA h g −1 at 1000 mA g −1 after 6000 cycles, and the capacity retention from 100 mA g −1 to 5000 mA g −1 is 62%. Furthermore, the PIHCs based on BF-PCNFs as anode and activated carbon as cathode exhibit an energy density of 87 Wh kg −1 and a power density of 393 W kg −1 . The capacity retention is as high as 78% over 4000 cycles. Considering the exceptional rate performance, long cyclability and high-mass-loading, our work may supply a new strategy for designing novel energy storage devices with outstanding performance.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米科技
·
功能材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·Vol. 50
·期 9
·15202-15208
·
IF 5.1
Xiong Huang,Pengfei Wang,Jianwei Zhao,Jun Yang,Zhenxiao Fu,Xiuhua Cao,Lei Zhang,Shuhui Yu,Rong Sun
As a dielectric material , BaTiO 3 -based ceramics are desirable for high performance ultra-thin multilayer ceramic capacitors (MLCCs) application. In this work, BaTiO 3 -based dielectric ceramics with superior dielectric properties were synthesized using a reducing atmosphere sintering process . It is found that the contribution of “wet" grain-boundary diffusion become significant as the oxygen partial pressure increases, resulting to a larger grain size and higher permittivity. Especially, for the specimen sintered in higher oxygen partial pressure , the stable temperature coefficient of capacitance (TCC) is dominated by irreversal domain due to the increase of super-lattice phase. Samples with higher oxygen partial pressure exhibit a higher permittivity of 2700 and better permittivity-temperature stability. Furthermore, ultra-thin MLCCs with thickness of 1 μm and capacitance of 10 μF and the TCC of X7R were successfully fabricated. This work provides a comprehensive explanation demonstrating upon the significant roles of grain size and defect engineering in the dielectric performance in BaTiO 3 -based ceramics, and points out an avenue to obtain excellent permittivity-temperature stability in ultra-thin MLCCs.
研究领域:
材料科学
·
电子陶瓷
·
介电材料
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固态物理
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功能陶瓷
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电容器技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Xiaoyu Zhao,Guangyu Li,Minghui Feng,Yanfei Wang
Compared to traditional extraction of lithium using solar evaporation, the electrochemical extraction is advantageous in many aspects, including elevated efficiency, superior selectivity, and low environmental pollution. In this study, LiNi 0·038 Mo 0·012 Mn 1·95 O 4 (LNMMO) with good lattice structure and nano morphology was successfully prepared and confirmed by XRD (X-ray diffraction), SEM-Mapping (scanning electron microscope mapping), SEM (scanning electron microscope), and EDX (Energy-dispersive X-ray spectroscopy) analyses. The pairing of LNMMO with activated carbon (AC) yielded obvious cost-effective and environmentally friendly composite when compared to conventional Noble metals used for battery anodes, such as Ag and Pt. A hybrid supercapacitor was assembled using delithiated LNMMO cathode (NMMO) and AC anode to form NMMO/AC. The cell showed high capacity, high rate performance, and excellent cyclic stability. A continuous flow NMMO/AC hybrid supercapacitor (CF-NMMO/AC) was developed for selective capture of Li + in aqueous solution by combining NMMO/AC hybrid supercapacitor with self-designed continuous flow control system. The device delivered high Li + extraction efficiencies reaching 14.4 mg/g per one cycle in simulated brine by consuming only 7.91 W h/mol Li + . The overall process produced 97.2％ Li + in simulated brine at optimized operating conditions. Overall, CF-NMMO/AC system provided higher efficiency, superior selectivity, and moderate energy utilization for Li + recovery from brine.
研究领域:
电化学
·
环境科学
·
材料科学
·
能源工程
·
分离科学
·
可持续技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Jian Wang,Zhiyu Xun,Chenyang Zhao,Yang Liu,Jiyou Gu,Pengfei Huo
Soy protein isolate (SPI) is one of the most abundant plant proteins in nature. Enormous studies have been carried out on SPI-based materials, however, the application for energy storage devices is still limited due to its fiddly film forming process and lack of electrochemical performance. Herein, we presented a SPI-based polymer electrolyte by grafting modification with the hydrophilic functional monomer acrylamide (AM). The optimized gel polymer electrolyte (GPE) exhibited an excellent ionic conductivity up to 5.10 mS cm −1 , which was greatly higher than gel polymer electrolyte based on original pure SPI (1.84 mS cm −1 ). More significantly, supercapacitors constructed by grafting-modified SPI delivered a specific capacitance of 141.74 F g −1 at 1.0 A g −1 and exhibited high capacitance retention of 95% after 8000 charge−discharge cycles. Beyond that, redox-active polymer electrolyte based on grafting-modified SPI combining with KI enormously improved the energy density of supercapacitor up to 27.52 Wh kg −1 at a current density of 0.5 A g −1 . This work provided a novel and facile strategy to obtain a high-performance SPI-based polymer electrolyte and laid an experimental foundation for the high-value application of SPI in the field of energy storage devices.
研究领域:
材料科学
·
高分子化学
·
能源存储
·
生物基材料
·
电化学
✓ 已验证
DOI
高影响因子
Small
·
2019
·Vol. 15
·期 30
·1902280
·
IF 10.856
Xijun Wei,Wanping Hu,Huarong Peng,Yuli Xiong,Peng Xiao,Yunhuai Zhang,Guozhong Cao
High energy and efficient solar charging stations using electrochemical capacitors (ECs) are a promising portable power source for the future. In this work, two kinds of metal-organic framework (MOF) derivatives, NiO/Co 3 O 4 microcubes and Fe 2 O 3 microleaves, are prepared via thermal treatment and assembled into electrochemical capacitors, which deliver a relatively high specific energy density of 46 Wh kg −1 at 690 W kg −1 . In addition, a solar-charging power system consisting of the electrochemical capacitors and monocrystalline silicon plates is fabricated and a motor fan or 25 LEDs for 5 and 30 min, respectively, is powered. This work not only adds two novel materials to the growing categories of MOF-derived advanced materials, but also successfully achieves an efficient solar-ECs system for the first time based on all MOF derivatives, which has a certain reference for developing efficient solar-charge systems.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
可再生能源
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 37
·21378-21385
·
IF 10.733
Wei Wen,Jincheng Yao,Hua Tan,Jin-Ming Wu
Electrode materials with hollow micro/nanostructures and high electrical conductivity are important for achieving high-power supercapacitors, especially those with super-fast charging/discharging. TiN, which can be easily obtained from TiO2, is regarded as a high-power supercapacitor material. Here, we report that a nanoscale Kirkendall effect is triggered by surface branches on TiO2 nanowires, which then transform into hollow TiN nanotrees during a thermal nitridation process. The surface branches play a key role in accelerating the initial reaction, which forms a uniform, continuous surface TiN layer and induces the Kirkendall effect via surface diffusion. The hollow TiN nanotrees have a high surface area, porous structure, and high electrical conductivity. The constructed symmetric supercapacitors exhibit high areal and volumetric energy density, super-fast charge/discharge ability, and good capacitance retention up to 350 000 cycles. This work provides a new method to synthesize hollow TiN nanostructures and demonstrates their advantages in achieving high-power energy storage devices.
研究领域:
材料科学
·
纳米科技
·
电化学
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）