Energy Technology
·
2021
·Vol. 10
·期 2
·2100350
·
IF 3.631
Liyue Xiao,Shuangrui Yao,Jie Liu,Hanjun Zou,Yanqin Xu,Yuan Cao,Changguo Chen
The nickel-based metallic organic framework (Ni-MOF) [Ni 2 (OH) 2 (C 8 H 4 O 4 )] material with a hierarchical microblocks structure is efficiently synthesized in 2 h by the ultrasonic method. At the moment Ni-MOF is used as the electrode materials and the supercapacitors (SCs) perform very well with great electrochemical capacity which exhibited particular electric capacitance of 631 C g −1 at a current density of 1 A g −1 . This is one of the highest performances and the shortest synthesis time reported so far for MOFs. Besides, there is a battery – SC hybrid SC assembled by using Ni-MOF and activated carbon. On the condition of having a power density of 302.2 W kg −1 with the voltage window of 1.2 V, the SC produces an energy density of 28.5 W h kg −1 . During the same period, the SC maintains outstanding cycling stability capacitance retention of 85.5% after 3000 cycles at current density of 10 A g −1 . The great electrochemical capability is due to the distinct crystal texture and particular morphological feature. Herein, it is displayed that the ultrasonic method is a fast and effective approach for preparing Ni-MOF SC electrode materials.
研究领域:
材料科学
·
电化学
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纳米材料
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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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·Vol. 45
·期 3
·1466-1476
·
IF 4.084
Yuelong Xu,Xiaoxi Dong,Junfeng Miao,Shasha Wang,Zhan Liu,Zuozhao Zhai,Lihui Zhang,Zhenfa Liu
Carbon nanomaterials that are electrochemically bifunctional and active in supercapacitor and hydrogen-evolution-reaction (HER) applications have attracted recent research attention. We have prepared porous carbon spheres - doped Ni, Co - alloys by using a hydrothermal method with melamine and pectin as precursors and with the addition of nickel nitrate and cobalt nitrate. The corresponding materials exhibit good electrochemical performance and excellent electrocatalytic activity for HER. The overpotential (OP) of the as-prepared materials can achieve 240 mV keeping a Tafel slope (TS) of 55 mV dec −1 at 10 mA cm −2 in an acid (0.5 M H 2 SO 4 ) solution. The corresponding samples maintain stability after 24 h and 5000 cycles in the chronovoltage and cyclic voltammetry methods, respectively. When the as-prepared materials are oxidized by 30% H 2 O 2 for 12 h, the corresponding as-prepared oxidation samples exhibit excellent electrochemical performance in a supercapacitor application. The specific capacitance (SC) of the as-obtained materials reaches 312 F g −1 at 1 A g −1 with decent rate capability and cyclic stability. This work provides new applications for bifunctional electrochemically active materials.
研究领域:
材料科学
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电化学
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纳米材料
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能源存储
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 8
·6451-6460
·
IF 3.442
Zhang Yixin,Liu Lei,Zhang Lili,Yu Yifeng,Lv Haijun,Chen Aibing
Carbon nanotube (CNT) has been intensively studied as supercapacitor electrode materials due to their high mechanical strength and excellent electrical conductivity. However, CNT with limited accessible surface area has low specific capacitance, which limits its application and development in supercapacitor. Herein, we have designed a thin N-doped porous carbon layer-modified CNT nanocomposite by template-free method. In this process, 3-aminophenol and formaldehyde rapidly self-assemble on the CNT in the presence of cationic surfactant CTAB, forming the composite of 3-aminophenol/formaldehyde (3-AF) resin and CNT. Due to the different polymerization degree of inside 3-AF resin, the soluble 3-AF resin oligomer was removed by acetone to form porous 3-AF resin and CNT@N-doped porous carbon (CNT@N-PC) was obtained by annealing process. The CNT@N-PC exhibited abundant porous structure, high specific surface area of 940 m 2 g −1 , excellent specific capacitance value of 224 F g −1 at 1 A g −1 and good cycle stability, demonstrating its potential as supercapacitor electrode materials.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nanomaterials
·
2014
·Vol. 2014
·期 1
·193201
·
IF 1.611
Yuan-Jun Song,Jing Chen,Jing-Yuan Wu,Tong Zhang
Silver nanowire has potential applications on transparent conducting film and electrode of electrochemical capacitor due to its excellent conductivity. Transparent conducting film (G-film) was prepared by coating silver nanowires on glass substrate using Meyer rod method, which exhibited better performance than carbon nanotube and graphene. The conductivity of G-film can be improved by increasing sintering temperature. Electrode of electrochemical capacitor (I-film) was fabricated through the same method with G-film on indium tin oxide (ITO). CV curves of I-film under different scanning rates had obvious redox peaks, which indicated that I-film exhibited excellent electrochemical pseudocapacitance performance and good reversibility during charge/discharge process. In addition, the specific capacitance of I-film was measured by galvanostatic charge/discharge experiments, indicating that I-film exhibits high special capacitance and excellent electrochemical stability.
研究领域:
材料科学
·
纳米科技
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Hongying Yang,Zhenfeng Cheng,Pengchao Wu,Yahui Wei,Jingyun Jiang,Qun Xu
Design and fabrication of 2D multi-metal oxalate materials with desired electrochemical activities are highly needed in electrocatalysis and supercapacitors . Herein, assisted by the deep eutectic solvothermal (DES) method, multi-metal oxalate consisting of Fe, Co, Ni, Cu, and Zn with different morphology was the controlled synthesis. It was found that the structure and composition of DES can control the nucleation and growth of multi-metal oxalate. High molecular PEG and gradually slow-release oxalic acid are in favor of the formation of 2D structure, while the low molecular EG and abundant oxalic acid are positive for the formation of 3D nanoparticles. The properties of the obtained multi-metal oxalates are confirmed by multi-analysis, which involves the single Ni-oxalate phase, morphological evolution ranging from particles to nanosheets, and complex composition up to five metal elements including Fe, Co, Ni, Cu as well as Zn. Notably, the well-designed 2D (FeCoNiCuZn)(C 2 O 4 )·2H 2 O nanosheets exhibit an ultralow overpotential of 334 mV at 100 mA cm −2 for OER as electrocatalyst with prolonged durability over 30 h at 10 mA cm −2 and a high specific capacity of 1337 C g −1 for aqueous supercapacitor.
研究领域:
材料化学
·
电化学
·
纳米材料
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能源存储
·
催化化学
✓ 已验证
DOI
高影响因子
VACUUM
·
2023
·
IF 4
Rui Yang,Xiangfeng Guo,Khaled Tawfik Alali,Kun Song,Lihua Jia,Tongle Ge,Xiaoshuang Chen,Dalei Song,Xuefeng Bai,Jun Wang
The construction of effective nano-microstructures electrode has been a tireless pursuit in the energy storage field. Herein, Controllable construction of diversified morphologies NiCo 2 O 4 nanomaterials by tuning the dielectric constant and viscosity of the mixed solvent. We employed different solvent compositions as deionized water (DI), DI:Ethanol (1:1), DI: Isopropanol (1:1), DI: Propylene glycol (1:1), DI: Butanediol (1:1). In mixed aqueous solvents with low dielectric constants of ethanol and isopropanol, metal ions diffuse well and the nanomaterials tend to construct sheet-like nanostructures whereas high viscosity of the propylene glycol and butanediol solution will slow down the rate of metal ion diffusion, which only grow uni-directionally to form rod-like nanostructures. The formed ear-shaped NiCo 2 O 4 nanostructures in V propylene glycol : V H2O = 1 : 1 mixed solvent have a large specific surface area and provide more electrochemically active sites, which facilitates effectively access electrolytes and thus accelerates the redox reaction rate. The resulting NiCo 2 O 4 nanoears exhibits favorable capacity of 251 mAh g −1 and excellent rate performance with a 73.0% capacity retention at 20 A g −1 . More importantly, the asymmetric supercapacitors assembled with the preferred NiCo 2 O 4 nanoears and active carbon (AC) reveal excellent electrochemical performance at operating potential of 1.6 V, great specific capacity (58.0 mAh g −1 ), energy and power density of 46.4 Wh kg −1 at 801 W kg −1 and a specific capacity retention rate of 90.7% after 5000 cycles. This work provides a new perspective for the controllable construction of new micro-nanostructure materials.
研究领域:
材料科学
·
电化学
·
纳米技术
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能源存储
·
功能材料
·
电化学能量储存
✓ 已验证
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2021
·Vol. 306
·期 11
·2100456
·
IF 4.367
Zhiqiang Wu,Qiang Guo,Yang Liu,Huihui Zhou,Hua Zheng,Xingfeng Lei,Lei Gong,Yanhui Chen,Zhenguo Liu,Qiuyu Zhang
In order to meet the requirements of polymer dielectric materials for high thermal stability and excellent dielectric properties in the application of high-temperature film capacitors, a series of polyimide (PI) films are fabricated by introducing a self-synthesized aniline trimer (ACAT) with a conjugated structure in this work. Since the conjugated ACAT in the main chains of PI improves the electron polarization and carrier mobility of the PI molecular chains, the dielectric constant of the ACAT-PI films is greatly enhanced (4.4–7.4). Meanwhile, the dissipation factor does not increase apparently (0.002–0.013). The dielectric properties are stable even when the temperature is up to 200 °C, the thermal degradation temperature is as high as 450 °C, and the mechanical properties are also excellent (70–105 MPa). Among all the films, the PI film with 5 mol% ACAT exhibits the maximal energy density of 3.6 J cm −3 under the field of 426 kV mm −1 , the high tensile strength (90 MPa) and the excellent thermal stability ( T d5 = 515 °C). The work paves the way to prepare high-temperature polymer dielectric film materials with high energy storage density.
研究领域:
材料科学
·
高分子化学
·
介电物理
·
能源材料
·
功能高分子
✓ 已验证
DOI
高影响因子
POWDER TECHNOLOGY
·
2024
·
IF 4.5
Huifeng Xu,Pengfei Wang,Saiwei Luan,Lixia Cheng,Zhenxiao Fu,Xiuhua Cao,Lei Zhang,Shuhui Yu,Rong Sun
Conventionally, tetragonality in BaTiO 3 powder is attributed to grain size, disregarding the role of Ba/Ti ratio. However, our study reveals a significant impact of Ba/Ti ratio on tetragonality in BaTiO 3 . With an increase in Ba/Ti ratio from 0.990 to 1.010, particle size remains around 200 nm. Tetragonality initially rises from 1.006 to a maximum of 1.0092 at Ba/Ti = 1.000, then decreases to 1.005. Lower tetragonality is associated with Ba or Ti vacancies, using density functional theory (DFT), we analyzed the electron density and lattice distinction in BaTiO 3 powders. Both Ba and Ti vacancies affect lattice distortion, the Ti vacancies leading to more significant lattice expansion and lower tetragonality than Ba vacancies. Using this powder, we fabricated high-density BaTiO 3 ceramics and multi-layer ceramics capacitors (MLCCs) with X7R temperature stability (−55 to 125 °C, ±15% coefficient) and excellent reliability. This strategy has broad implications for tetragonal BaTiO 3 nanopowders and MLCCs development.
研究领域:
材料科学
·
无机非金属材料
·
电子陶瓷
·
固态化学
·
功能材料
✓ 已验证
DOI
高影响因子
SYNTHETIC METALS
·
2016
·
IF 2.299
Qiang Zhao,Junhua Chen,Fubin Luo,Lu Shen,Ying Wang,Kun Wu,Mangeng Lu
Nanostructure of ordered polyaniline-graphene (PANI-rGO PMAS ) hybrid nanomaterials is assembled based on poly(2-methoxyaniline-5-sulfonic acid) (PMAS) functionalized reduced graphene oxide (rGO PMAS ) nanosheets. The presence of PMAS not only improves dispersibility of reduced graphene oxide nanosheets, but also plays a key role for heterogeneous nucleation of polyaniline (PANI) nanorods . The formation mechanism of ordered PANI-rGO PMAS hybrid nanomaterials was studied in details by using field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and ultraviolet-visible spectrophotometry (UV–vis). The conductivity of PANI-rGO PMAS hybrid with 17 wt% rGO PMAS is as high as 4480 S/m, compared with 2.93 S/m for pure PANI. The cyclic voltammetry tests indicate that, PANI-rGO PMAS containing 2 wt% rGO PMAS possesses fast response to redox reactions and excellent reversible stability. It has a high specific capacitance of 385 F g −1 at the scan rate of 10 mV s −1 with potential ranges from −0.2 to 0.8 V. This ordered polyaniline-graphene hybrid has potential applications for flexible supercapacitors, sensors, batteries, electromagnetic materials and thermoelectric materials, etc.
研究领域:
材料科学
·
纳米科技
·
高分子化学
·
电化学
·
能源材料
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Yongpeng Cui,Huanlei Wang,Nan Mao,Wenhua Yu,Jing Shi,Minghua Huang,Wei Liu,Shougang Chen,Xin Wang
The increasing demand for supercapacitors with high energy and power density has attracted extensive attention in designing advanced carbon materials with high accessible surface area, hierarchical porosity , and 2D/3D morphology. Here, we report a new approach to tune the morphology and structure of the nanocarbons by using methyl cellulose as the precursor. Due to the varying effect of different activating agents, the interconnected sheet-like carbon with a high surface area of up to 2285 m 2 g −1 and a thickness down to ∼4 nm can be obtained. These important characteristics make the nanocarbons demonstrate a high capacitance of 144 F g −1 at 1 A g −1 and 20 °C, and an excellent capacitance retention ratio of 64% at 100 A g −1 in ionic liquid . Because of the high fraction of meso/macropores for nanocarbons, an outstanding capacitance of 116 F g −1 can be achieved at 0 °C, with a high capacitance retention ratio of 39% at 100 A g −1 . A high energy of 16–17 and 9–10 W h kg −1 can be maintained at 20 and 0 °C when the supercapacitor is charged in less than 1s. The excellent electrochemical response of nanocarbons suggests that the proposed preparation process is promising for developing advanced carbon electrodes.
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
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Libo Deng,Wenhua Zhong,Jubei Wang,Peixin Zhang,Haoming Fang,Lei Yao,Xuqing Liu,Xiangzhong Ren,Yongliang Li
Biomass-derived carbons have been extensively researched as electrode material for energy storage and conversion recently. However, most of the previous works convert crude biomass directly into carbon and the electrochemical capacitances for the resultant carbons are quite often underestimated as well as large variations in capacitances exist in literatures due to the complex nature of biomass, which practically hinder their applications. In this work, polysaccharide nanofibers were extracted from an inexpensive natural fungus using a hydrothermal method and were converted to porous carbon nanofibers (CNFs) by potassium hydroxide activation. The porous carbons were assembled into symmetric supercapacitors using both potassium hydroxide and an ionic liquid (IL) as electrolytes. Solid state nuclear magnetic resonance characterization showed that the micropores of the as-prepared carbons are accessible to the IL electrolyte when uncharged and thus high capacitance is expected. It is found in both electrolytes the electrochemical capacitances of CNFs are significantly higher than those of the porous carbon derived directly from the crude fungus. Furthermore, the CNFs delivered an extraordinary energy density of 92.3 Wh kg −1 in the IL electrolyte, making it a promising candidate for electrode materials for supercapacitors.
研究领域:
材料科学
·
能源化学
·
纳米技术
·
电化学
·
可再生能源
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 93
·76116-76121
·
IF 3.84
Hailing Xu,Huang Jiang,Xingwei Li,Gengchao Wang
Polyaniline doped with lignosulfonate (PANI/LGS) was prepared by using a facile oxidative polymerization of aniline with (NH4)2S2O8 as an oxidant, and the structure and morphology of PANI/LGS were investigated. As an active material for supercapacitors, the capacity retention rate of PANI/LGS was 75.1% with a growth of current density from 0.2 to 10 A g−1, indicating a high rate performance, and that of PANI was only 38.3%. For PANI/LGS, a specific capacitance of 377.2 F g−1 remained at 10 A g−1, and that of PANI was 183.7 F g−1. Moreover, the cycling stability was also measured in a two-electrode symmetrical capacitor at a current density of 1.0 A g−1. The capacity retention rate of PANI/LGS was 74.3% after 10 000 cycles, and that of PANI was 52.8%.
研究领域:
材料科学
·
电化学
·
高分子化学
·
能源存储
·
纳米材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）