ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Peng Zhang,Zhimeng Liu,Yuping Liu,Hongbo Fan,Yuanqi Jiao,Baiman Chen
In this work, we demonstrate a facile approach to synthesize high-performance and stable TiO 2 @PANI core-shell nanowires (NWs) as flexible electrodes for solid-state supercapacitors (SCs). The TiO 2 @PANI core-shell NWs are grown directly on highly conductive carbon cloth, which not only give efficient charge transport and accessible diffusion of the electrolyte, but also provide large surface area and active sites for redox reaction as well as good strain accommodation. Such these features enable them to deliver a large areal capacitance of 520.3 mF/cm 2 at 0.5 mA/cm 2 with outstanding rate capability. Furthermore, a flexible and stable solid-state SC device based on these TiO 2 @PANI core-shell NWs is also demonstrated. The as-fabricated solid-state SC device yields a remarkable volumetric capacitance of 898.4 mF/cm 3 , excellent flexibility and significant cycling stability with more than 97.2% retention of its capacitance after 10000 cycles. We believe that these findings may open up new opportunities to prepare high-performance PANI-based electrodes for flexible solid-state SCs.
研究领域:
材料科学
·
纳米科技
·
电化学
·
能源存储
·
功能材料
·
柔性电子学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 28
·期 17
·12747-12754
·
IF 2.019
Huang Feng,Yan Aihua,Sui Yanwei,Wei Fuxiang,Qi Jiqiu,Meng Qingkun,He Yezeng
Ni 3 S 4 @MoS 2 nanosheets grown on the carbon fiber paper (Ni 3 S 4 @MoS 2 /CFP) were successfully prepared via a facile one-step hydrothermal technique. Serving as a supercapacitor electrode, the obtaining Ni 3 S 4 @MoS 2 /CFP exhibits a remarkable specific capacitance of 1296 F/g, high rate capability of 57.8%, and excellent cycling stability of 96.2% retention after 5000 cycles. The superior electrochemical properties of Ni 3 S 4 @MoS 2 /CFP nanocomposite is attributed to the synergistic effects of the layeredNi 3 S 4 , MoS 2 and the conductive CFP.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
功能材料
·
复合材料
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2013
·Vol. 1
·期 47
·14943-14950
·
IF 0
Hai Fu,Zhong-jie Du,Wei Zou,Hang-quan Li,Chen Zhang
A carbon nanotube reinforced polypyrrole nanowire network was constructed by in situ polymerization of pyrrole in the presence of carbon nanotubes using cetyltrimethylammonium bromide micelles as a soft template. Carbon nanotubes as a reinforcer were embedded into a network of polypyrrole nanowires, thus retaining in the latter a complete network. The resulting network possessed a specific surface area of 112.1 m2 g−1 and a rough porous structure. The embedding of carbon nanotubes decreased the charge transfer resistance in the polypyrrole nanowires and allowed easy access and rapid diffusion of ions/electrons. When applied as a capacitive electrode, a specific capacitance of 183.2 F g−1 was observed at a current density of 8 A g−1. The specific capacitance retention was 85% after 1000 cycles at 1 A g−1. An asymmetric supercapacitor was fabricated using the network as a positive electrode and active carbon as a negative electrode, and when operated at a maximum voltage of 1.5 V, had a high energy density (15.1 W h kg−1 at 3000 W kg−1). A long-term cycling test of the asymmetric supercapacitor at a current density of 1 A g−1 displayed a capacitance retention of 72% even after 3000 cycles of charge and discharge.
研究领域:
材料科学
·
纳米科技
·
电化学
·
能源存储
·
高分子科学
✓ 已验证
DOI
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
·
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
·
电化学
·
纳米复合材料
·
能源存储
·
界面工程
·
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
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
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
·
固态物理
·
功能陶瓷
·
电容器技术
✓ 已验证
DOI
高影响因子
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
·
纳米材料
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Chunyu Xu,Yajuan Jiang,Shijie Ren,Tao Huang,Xiuyun Zhang,Guisheng Zhu,Kunpeng Jiang,Yunyun Zhao,Huarui Xu
In this paper, a facile bio-templating method is proposed to prepare NiCoP coated on amorphous carbon (NiCoP@AC) composite electrode materials with using bagasse as template and carbon source. NiCoP nanowire network arrays precursors coating on bagasse substrate with high yield were prepared via a novel synthesis strategy utilizing the toluene-water interface reaction process, which subsequently formed as NiCoP@AC composite electrode materials after phosphating process. The assembled core-shell structure attenuated the volume expansion during charging and discharging, additionally, the overall electrical conductivity of the composite was also improved owing to the characteristic of bagasse biochar. The NiCoP@AC electrode exhibited high specific capacitance (1706 F g −1 at 1 A g −1 ), outstanding rate capability (82.1 % capacity retention from 1 to 20 A g −1 ) and good cycling stability (retaining 80.0 % capacitance over 5000 cycles). In addition, bagasse biomass activated carbon (BAC) was prepared via a typical alkaline activation process for the use as negative electrode. The as-fabricated NiCoP@AC//BAC supercapacitor displayed a high energy density of 46.2 Wh kg −1 at a power density of 807.3 W kg −1 , and an excellent capacitance retention rate (88.5 % after 5000 cycles), suggesting that the as-prepared NiCoP@AC electrode materials have wide application prospects in high-performance supercapacitors.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
生物基材料
·
功能复合材料
✓ 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
·
电化学
·
纳米材料
·
能源存储
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2016
·
IF 2.822
Yanmeng Cai,Yue Wang,Xinyu Han,Liwen Zhang,Shichang Xu,Jixiao Wang
The composites of carbon nanotube (CNT) and the conducting polymer polypyrrole (PPy) doped with dodecyl benzene sulfonate (DBS − ) and Cl − were prepared respectively by chemical oxidation method and made into two types of composite electrode (PPy-DBS/CNT and PPy-Cl/CNT) for capacitive deionization (CDI) cell. Enhanced electrochemical performance of the composite electrodes was confirmed by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) test. The results of CV showed that the specific capacitance of PPy/CNT doped with either DBS − or Cl − was about 2.3–2.5 times that of the CNT electrode. And EIS test demonstrated that the charging resistance for both the PPy-DBS/CNT and PPy-Cl/CNT electrodes was dramatically reduced and only about 10% that of the CNT electrode. By pairing the two composite electrodes with CNT electrodes, four cells were assembled to study the effects of electrode assembling patterns on the desalination performance of the CDI process. The results indicated that the CDI cells involving either the PPy-DBS/CNT electrode or the PPy-Cl/CNT electrode, or both of them exhibited much higher electrosorption capacity (from 40.8 to 72.36 mg/g) than that of the CDI cell assembled with two CNT electrodes (about 12.6 mg/g). And the composite electrodes kept good stability and fast regeneration rate after several desalting cycles. Thus, it is believed that the enhanced performance and optimized electrode assembly of the CDI cell should be with the composite electrodes that have the good ability of ion selective adsorption for cations or anions.
研究领域:
材料科学
·
环境工程
·
电化学
·
水处理技术
·
功能高分子材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）