JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2015
·
IF 2.729
Xue Chen,Xiaoshu Zhu,Yinghong Xiao,Xiaodi Yang
A novel electrode material for supercapacitor composed of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT) and graphitic-phase C 3 N 4 (g-C 3 N 4 ) was prepared by a layer-by-layer assembly method. The resulting composite of PEDOT/g-C 3 N 4 represented excellent electrochemical stability in neutral electrolyte and enhanced electrochemical performance of capacitance and average energy density in comparison with single PEDOT. The specific capacitance was 137 F g −1 in H 2 SO 4 and 200 F g −1 in Na 2 SO 4 at a current density of 2 A g −1 , respectively. More significantly, the average energy density was 9.65 W h kg −1 at an average power density of 4001.86 W kg −1 in H 2 SO 4 . While in Na 2 SO 4 , the average energy density reached 17.5 W h kg −1 at an average power density of 5000 W kg −1 . More than 89% and 96.5% of capacitance were retained in H 2 SO 4 and Na 2 SO 4 respectively, suggesting that PEDOT/g-C 3 N 4 possessed an excellent cycling stability in view of capacity performance as electrode materials. The property improvement was attributed to the synergistic effects of the two components in the composite.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2023
·
IF 2.6
Wu Wenrui,Wang Xin,Yan Yue,Zhang Hao,Xu Tao,Li Xianfu
The objective of this work was to prepare and evaluate Ni 3 S 4 /graphene nanostructures for making high-performance supercapacitor electrodes. A one-pot solvothermal method was developed to prepare the hierarchical nanostructures consisting of Ni 3 S 4 nanoflowers on graphene nanosheets. Due to the hierarchical structure of Ni 3 S 4 nanoflowers on graphene nanosheets, the resulting electrodes exhibited high supercapacitive performance. Herein, the Ni 3 S 4 /graphene electrode demonstrated the specific capacitance of 978.4 F g –1 at the current density of 0.5 A g –1 , the rate capability and long-term cycling stability were also excellent. Moreover, the capacitance contribution of NG-60 can reach 87.9% of the total capacity at 10 mV s −1 . The high pseudo-capacitive performance can be attributed to the superior electronic conductivity of graphene nanosheets and the well interconnected tiny pores/channels in the Ni 3 S 4 nanoflower arrays. The prepared Ni 3 S 4 /graphene hierarchical nanostructures may be promising as innovative electrode materials for making high-performance supercapacitors.
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 Materials Chemistry C
·
2022
·Vol. 10
·期 40
·14929-14938
·
IF 8.067
Xudong Liu,Yong Liu,Shangli Dong,Xuefeng Zhang,Shida Hou
Chemical doping of MXenes with heteroatoms is expected to be a promising strategy for enhancing their electrochemical performance. Nevertheless, the synergistic effects of chemical doping and 3D structure construction have rarely been investigated in depth. Aiming to avoid MXene nanosheet restacking and further enhance the electrochemical performance, herein, we reported a simple strategy combining nitrogen doping with a 3D structure construction on MXenes via a one-step hydrothermal method. The location and types of nitrogen doping can be adjusted by hydrothermal conditions. The obtained nitrogen-doped Ti3C2Tx aerogel had an ultra-high specific surface area of 200.8 m2 g−1 with high porosity. The open reticular walls can expose more nitrogen-enriched Ti3C2Tx edges to the electrolyte. Nitrogen dopants at the edges of Ti3C2Tx nanosheets produced more number of active sites and provided higher pseudocapacitance, and the presence of N-C4 increased the electron mobility of Ti3C2Tx, which reduced charge transfer resistance evidently. As a result, the nitrogen-doped Ti3C2Tx aerogel showed an excellent specific capacitance (531 F g−1 in H2SO4 electrolyte) with good cyclic stability (remaining 96% after 5000 cycles).
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
IONICS
·
2022
·Vol. 28
·期 10
·4769-4777
·
IF 2.961
Chang Xueyi,Qiu Yongfu,Cheng Zhiyu,Wang Xiaoting,Zhong Qingpeng,Huang Huizhen
To improve the specific capacitance of supercapacitor with bismuth oxide, this paper reports hollow nanosheet-assembled α-Bi 2 O 3 spheres prepared by solvothermal method as novel electrode materials. The electrochemical results show that the hollow nanosheet-assembled α-Bi 2 O 3 spheres exhibited a high electrochemical performance with a maximum specific capacitance of 1380.2 F g −1 at a current density of 1 A g −1 , which is the highest specific capacitance achieved to date with bismuth oxide as electrode material, and remarkable rate capability of 84.1% when the current density increased to as high as 15 A g −1 . The reasons for the high capacitance performance of the product are due to the monoclinic α-Bi 2 O 3 with a stable phase and more ion channels to transport and store ions, as well as the hollow spherical structure with porosity, which makes the material fully utilized. In a word, Bi 2 O 3 should be as a promising candidate towards high-performance electrode for pseudocapacitive supercapacitor.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Longyan Zhang,Gang Zhao,Xinming Wu
Molybdenum disulfide (MoS 2 ) has been widely studied in supercapacitors due to its high theoretical capacity, but the lower intrinsic conductivity limits its further application. In this paper, Al, P-doped MoS 2 was grown in situ on carbon cloth using a one-step hydrothermal method, respectively, and the implementation of the doping strategy increased the layer spacing of MoS 2 while synergistically improving the conductivity and specific capacitance of the material. The results show that Al, P doping not only enhance the conductivity of pristine MoS 2 by 35.8% and 21.1%, respectively, but also improve the specific capacitance from 284.4 F g -1 (at a current density of 0.5 A g -1 ) to 424.6 F g -1 and 449.2 F g -1 , respectively. Surprisingly, the ASC device assembled with Al 0.05 -MoS 2 as the positive electrode and P 0.05 -MoS 2 as the negative electrode achieved an energy density of 30.07 Wh kg -1 at a power density of 1259.99 W kg -1 . These results demonstrate the superiority of Al, P-doped MoS 2 nanoflowers for high-performance supercapacitor applications.
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
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Xin Wang,Shuai Lin,Haiyun Tong,Yanan Huang,Peng Tong,Bangchuan Zhao,Jianming Dai,Changhao Liang,Hai Wang,Xuebin Zhu,Yuping Sun,Shixue Dou
Two-dimensional (2D) MXenes such as Ti 3 C 2 , Ti 2 C, Mo 2 C, and Mo 1.33 C have shown excellent electrochemical performances as supercapacitor electrodes, and the exploration of new and/or high-capacity MXene-based supercapacitor electrode materials is an active field. In this work, 2D multi-layered V 4 C 3 MXene has been synthesized by selectively etching Al from V 4 AlC 3 and it shows a high capacitance of 209 F g −1 at 2 mV s −1 , good rate performance, and stable long cyclic performance with capacitance retention rate of 97.23% after 10000 cycles at 10 A g −1 in 1 M H 2 SO 4 . Importantly, the pseudocapacitance (∼100.1 F g −1 ) accounts for about 37% of the total capacity (∼268.5 F g −1 ) for V 4 C 3 MXene electrode. Therefore, the high specific capacitance of V 4 C 3 MXene is not only due to their wide interlayer spacing (∼0.466 nm), large specific surface areas (∼31.35 m 2 g −1 ) and pore volumes (∼0.047 cm 3 g −1 ), and good hydrophilicity but also attributed to the abundant valence states of vanadium (+2, +3, and +4). The high rate performance and excellent cycling stability of V 4 C 3 MXene electrodes are mainly attributed to the high electronic conductivity (1137 S m −1 at 300 K). The present work provides another promising MXene-based supercapacitor electrode material.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
IONICS
·
2022
·Vol. 28
·期 6
·2979-2989
·
IF 2.961
Qi Jiqiu,Gu Huwei,Ruan Chenya,Zhu Lei,Meng Qingkun,Sui Yanwei,Feng Xiujuan,Wei Wenqing,Zhang Hao
MXene, an emerging 2D material, has aroused great concern in the field of supercapacitors owing to its charming properties. However, the relatively low specific capacitance of pristine MXene is unsatisfactory, which is caused by the restacking issue of MXene nanosheets. In this paper, a facile and cost-effective electrostatic self-assembly followed by hydrothermal method was adopted to prepare NiCo 2 S 4 decorated multilayer MXene nanosheets (MXene/NiCo 2 S 4 ). The introduced NiCo 2 S 4 effectively alleviates the self-restacking of MXene nanosheet and facilitates ion accessibility. Hence, the as-prepared MXene/NiCo 2 S 4 electrode displays a maximum specific capacitance of 1211.1 F g −1 at 1 A g −1 , surpassing the NiCo 2 S 4 electrode (938.4 F g −1 at 1 A g −1 ) and pure MXene electrode (84.2 F g −1 at 1 A g −1 ). The assembled asymmetrical supercapacitor utilizing hybrid MXene/NiCo 2 S 4 and RGO delivers a high energy density of 38.7 Wh kg −1 and high power density of 6137 W kg −1 . This work can provide a reliable reference for the synthesis of hybrid MXene/sulfide electrodes with ideal electrochemical performance.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Zongliang Yu,Shunxiang Wang,Zuoan Xiao,Fen Xu,Cuili Xiang,Lixian Sun,Yongjin Zou
Transition metal oxides are excellent electrode materials for supercapacitors because of their high theoretical capacitance, good stability, environmental friendliness, and tunable structure. In this study, Cu 2 O-CoO heterojunction materials loaded on graphene oxide (Cu 2 O-CoO/GO) are prepared via the precipitation, hydrothermal, and heat treatment processes . Through the adsorption of transition metal ions by the oxygen-containing functional groups of GO, followed by alkali titration as well as hydrothermal reaction of Cu 2+ and Co 2+ ions, the hydroxides of metals are adsorbed on GO. Meanwhile, the reduced GO completes the self-assembly, and the GO with good spatial structure supports the formation of Cu 2 O-CoO heterojunction structure. The Cu 2 O-CoO/GO electrode material combines the high conductivity of GO with the excellent internal conductivity of Cu 2 O-CoO, and its abundant active sites and specific surface area, thereby ensuring good electrochemical performance. Thus, it enables reversible ion adsorption and desorption, exhibits the pseudocapacitance of copper oxide and cobalt oxide, and has higher capacitance performance than Cu 2 O/GO and CoO/GO electrodes. The specific capacitance of Cu 2 O-CoO/GO at 1 A g −1 is 723 F g −1 . Cu 2 O-CoO/GO/ASC exhibits an energy density of 44.1 Wh kg −1 at 794 W kg −1 and capacitance retention rate of 89.3 % after 10,000 cycles. This indicates that the material has significant potential for a wide range of supercapacitor applications.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2019
·
IF 1.901
Yingying Hao,Hui Huang,Qingqing Wang,Qian Wang,Guowei Zhou
A novel and facile strategy was developed to prepare nitrogen-doped carbon/NiMoO 4 (NDC/NiMoO 4 ) nanospheres using cetyltrimethylammonium bromide–polyvinyl pyrrolidone–cyclohexane–water–ethanol microemulsion aggregation as a soft template. The prepared NDC/NiMoO 4 exhibited a marvelous specific capacitance of 1045 F g −1 at 1 A g −1 . After 10,000 cycles the specific capacity is 60% of the initial performance. The energy density reached 107.3 Wh kg −1 at a power density of 799.9 W kg −1 . The excellent electrochemical performance can be attributed to the unique morphology of NDC/NiMoO 4 and the abundant doped N and C elements. This study enables their application in high-performance supercapacitors.
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
SYNTHETIC METALS
·
2016
·
IF 2.299
Gang Fu,Li Ma,Mengyu Gan,Xiuling Zhang,Meng Jin,Yao Lei,Peishu Yang,Maofa Yan
This research paper describes a facile strategy to synthesize the novel 3D Spongia-shaped polyaniline/MoS 2 nanospheres composite under the addition of polyvinylpyrrolidone (PVP) (named sPANI/A-MoS 2 ), and this composite displays excellent electrochemical properties as an electrode material for supercapacitors. The structure and morphology of the as-prepared 3D sPANI/A-MoS 2 are characterized by scanning electron microscopy (SEM), Fouriertransform infrared (FT-IR), X-ray diffraction (XRD), X-ray photoelectron spectrum (XPS), Raman spectroscopy measurements and Thermogravimetric Analysis (TGA). Cyclic voltammograms (CV) and galvanostatic charging/discharging (GCD) tests are adopted to evaluate the electrochemical performances of the composite. All the results powerfully demonstrate the successful fabrication of 3D sPANI/A-MoS 2 . The maximum specific capacitance of this composite reaches up to 605 F g −1 at a current density of 1 A g −1 , and the energy density of 53.78 Wh kg −1 is obtained at a power density of 0.4 kW kg −1 . Notably, the capacity retention of the as-fabricated sPANI/A-MoS 2 composite electrode can maintain 88.6% (well above 59.8% for sPANI) after constant charge-discharge 1000 cycles, showing an excellent electrochemical stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Yutong Li,Su Zhang,Huaihe Song,Xiaohong Chen,Jisheng Zhou,Song Hong
Heteroatom-doped carbon with 4.06% of nitrogen and 10.42% of oxygen was synthesized by pyrolysis of ortho-aminophenol/formaldehyde resin. After high temperature hydrogen reduction, 2.22% of the surface oxygen was removed while the nitrogen content remained almost no change. The specific surface area enlarged from 90 m 2 g −1 to 226 m 2 g −1 and abundant micropores appeared. But we found that the specific capacitance of the reduced carbon as electrode for supercapacitors was decreased nearly 25 %. By measuring the conductivity, surface wettability, and electrochemical impedance, we proposed that (a) surface oxygen played an important role in the capacitive performance, especially the pseudocapacitance; (b) though the doped-oxygen reduced the electronic conductivity, on the other hand, enhanced the surface wettability and ion diffusion rate of the carbon electrodes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Hao Guo,Hao Zhang,Ning Wu,Zhilan Pan,Cuiliu Li,Yuan Chen,Yujuan Cao,Wu Yang
In this article, a trimesic acid-mediating control synthesis strategy was proposed for preparing the NiCo-MOF composition structure of microsphere and nanosheet by substituting 1,4-dicarboxybenzene with trimesic acid. Then the pre-synthesized MOF , as a precursor and template, was further vulcanized by a facile hydrothermal method to obtain hollow microsphere and nanosheet interleaved nickel and cobalt bimetallic sulfide materials (NiCo-S) while these microspheres and nanosheets were composed of smaller nanoparticles . This unique structure endowed quick electron/ion transport and electrolyte penetration as well as abundant redox active sites, significantly facilitating electrochemical performance. The obtained NiCo-S-2 showed higher specific capacitance (1790.4 F g −1 ) than its precursor NiCo-MOF-2 and other molar ratios of counterparts. Using it as an positive electrode and activated carbon (AC) as negative electrode, the assembled asymmetric supercapacitor NiCo-S-2//AC also delivered a high specific capacitance of 114.4 F g −1 and big specific energy of 35.5 Wh kg −1 at 799.99 W kg −1 .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）