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
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Lijie Hou,Chao Kong,Zhongai Hu,Yanxia Han,Bowan Wu
Emodin is a natural anthraquinone derivative and contains abundant hydroxyl and carbonyl groups, which has high redox activity. As guest molecules, Emodin molecules were anchored on graphene sheet (GNS) by simple one-step reflux method. In the three-electrode system, the optimal composite electrode material (E@GNS) obtained the high specific capacitance of 338.9 F g −1 at 5 mV s −1 and excellent rate capability in 1 mol L −1 H 2 SO 4 . Finally, an asymmetric supercapacitor (ASC) was fabricated by using E@GNS as negative electrode and Caffeic acid non-covalently modified graphene hydrogel (GH-CFA) as positive electrode, respectively. The device achieved the energy density of 32.8 Wh kg −1 along with power density of 0.8 kW kg −1 , and a light-emitting diode (LED) could be light up by two ASCs in series. To compare with the performance of ASC, we also assembled symmetric supercapacitor based on E@GNS, proving that the good matching of positive and negative electrode materials could make the supercapacitor exhibit the best capacitive performance.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Chengwei Ye,Lan Xu
In view of the respective advantages of electrical double layer capacitance (EDLC) and pseudocapacitance , the development of electrode materials with dual energy storage mechanisms (EDLC and pseudocapacitance) will play a significant role in maximizing the overall capacitance performance. In this paper, the core-shell fibers with dense zeolite imidazole framework (ZIF) coating were synthesized on the electrospun composite nanofiber substrate by a rapid in-situ growth strategy. After pyrolysis of ZIFs(shell)@PAN/PVP(core) fibers, heteroatom-doped porous carbon fiber materials with high specific surface area (410.55 m 2 g -1 ) were obtained. It not only had a layered porous structure , but also fully exposed the doped active sites, which made it have the advantages of EDLC and pseudocapacitance. As expected, the prepared porous carbon materials doped with rich heteroatom, as supercapacitor electrode materials, exhibited large specific capacitances of 492.7 F g −1 at a current density of 1 A g −1 and 406.4 F g −1 at 10 A g −1 . After 5000 cycles of galvanostatic charge-discharge at 10 A g −1 , its capacitance retention rate was as high as 98.65%, showing excellent charge storage performance and good cycle stability. Therefore, this work presents an effective strategy for the design and preparation of supercapacitor electrode materials with dual energy storage mechanisms.
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
Advanced Science
·
2015
·Vol. 2
·期 12
·1500126
·
IF 0
Houlei Cui,Guilian Zhu,Xiangye Liu,Fengxin Liu,Yian Xie,Chongyin Yang,Tianquan Lin,Hui Gu,Fuqiang Huang
Supercapacitors suffer either from low capacitance for carbon or derivate electrodes or from poor electrical conductivity and electrochemical stability for metal oxide or conducting polymer electrodes. Transition metal nitrides possess fair electrical conductivity but superior chemical stability, which may be desirable candidates for supercapacitors. Herein, niobium nitride, Nb 4 N 5 , is explored to be an excellent capacitive material for the first time. An areal capacitance of 225.8 mF cm −2 , with a reasonable rate capability (60.8% retention from 0.5 to 10 mA cm −2 ) and cycling stability (70.9% retention after 2000 cycles), is achieved in Nb 4 N 5 nanochannels electrode with prominent electrical conductivity and electrochemical activity. Faradaic pseudocapacitance is confirmed by the mechanistic studies, deriving from the proton incorporation/chemisorption reaction owing to the copious +5 valence Nb ions in Nb 4 N 5 . Moreover, this Nb 4 N 5 nanochannels electrode with an ultrathin carbon coating exhibits nearly 100% capacitance retention after 2000 CV cycles, which is an excellent cycling stability for metal nitride materials. Thus, the Nb 4 N 5 nanochannels are qualified for a candidate for supercapacitors and other energy storage applications.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2024
·
IF 3.9
Wenhui Xiong,Zijie Cai,Zihao Wang,Zhongkai Wu,Wencen Mei,Zhizheng Wu,Dingbang Liu,Shiming Yang,Weiping Zhou,Zhenzhi Cheng,Jun Wang,Guangsheng Luo
Multivariate transition metal sulfides and porous nanosheet architectures hold promising potential for applications for the energy-related application. Nevertheless, the addition of polymer binders and conductive agents can adversely affect their electrochemical performance. In this work, we present self-assembled Ni-Co sulfide nanosheet arrays growing on foamed Ni (Ni-Co-S@NF). Ni-Co-S@NF electrode materials are synthesized through the complete sulfidation of interconnected ultrathin nanosheets derived from NiCo layered double hydroxides. The highly conductive nickel foam facilitates electron transfer while the 3D network structure promotes electrolyte diffusion and penetration. Hence, porous Ni-Co-S@NF materials presents the excellent specific capacitance as 1286.6C g −1 in 1 A g −1 and retained 70 % of its original capacity over 5000 charge–discharge cycles. Furthermore, we assemble an asymmetric supercapacitor used active carbon as negative-electrode material and Ni-Co-S@NF as positive-electrode material. This device delivers the specific energy is 74.0 Wh kg −1 and specific power of 850.0 W kg −1 .
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Zhenzhen Liu,Li Wang,Yingxi Xu,Jianyu Guo,Siyong Zhang,Yan Lu
In this study, Ti 3 C 2 T X @PEDOT composite is synthesized using multilayer Ti 3 C 2 T X and conductive polymer poly(3,4-ethylenedioxythiophene) (PEDOT) by a simple in-situ polymerization method. The PEDOT component effectively solves the problem of Ti 3 C 2 T X layers stacking and further improves the specific surface area of Ti 3 C 2 T X . Besides, additional pseudocapacitance is also provided by the added PEDOT component. In 1 M H 2 SO 4 , the Ti 3 C 2 T X @PEDOT (1:10) composite exhibits a higher capacitance (564 F g −1 ) at the current density of 1 A g −1 compared to the original Ti 3 C 2 T X material, and excellent cycling performance with a capacitance retention of 96.5% after 10,000 charge/discharge cycles at a current density of 10 A g −1 . The Ti 3 C 2 Tx@PEDOT(1:10)-based symmetric supercapacitor shows a specific capacitance of 100 F g −1 at the current density of 1 A g −1 , and an energy density of 6.34 Wh kg −1 at the power density of 4077 W kg −1 . The enhanced electrochemical performance and stability are due to the surface redox process and synergistic effects of the Ti 3 C 2 T X @PEDOT.
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
·
2019
·
IF 4.175
Ling Kang,Chun Huang,Nan Zhang,Jian Zhang,Chen Luo,Chaolun Wang,Xiaofeng Zhou,Xing Wu
With the renaissance of oxygen vacancy strategy, MnO 2 has attracted renewed attention as one promising candidate of electrode materials for high energy density supercapacitors (SCs). However, the rational synthesis of such oxygen-deficient MnO 2 with controllable vacancy content and structure is the main challenge for high-performance SCs. Herein, we developed a one-step and template-free method to synthesize oxygen-deficient MnO 2 via the redox reaction between KMnO 4 and glucose. Glucose functions as both the reductant and the structure-directing agent. Synthetic temperature was manipulated to control the morphology and the oxygen vacancy content of the products. The sponge-like 3D architecture constructed by the interconnected tiny nanosheets can be realized at low temperature (<100 °C ), which can exhibit the large specific surface area up to 197.41 m 2 g −1 . The as-prepared active material at 60 °C exhibits high specific capacitance 358.8 F g −1 @ 2 A g −1 and high-rate capability 280.9 F g −1 @ 15 A g −1 . An asymmetric supercapacitor (ASC) is assembled by using our MnO 2 as the cathode and activated carbon (AC) as the anode. The obtained ASC can deliver the energy density up to 98.01 Wh kg −1 , the power density up to 59.43 kW kg −1 . After 15000 cycles, the capacitance retention rate still can keep 94.5%. This result indicates the promising prospective of oxygen-deficient MnO 2 in ACSs.
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
Heliyon
·
2024
·
IF 3.4
Yige Yan,Mohan Huang,Yongsheng Wang,Dawei He,Jiaqi He
Metal-organic frameworks (MOF) have been wildly synthesised and studied as electrode materials for supercapacitors, and bimetallic MOF of Ni and Co has been broadly studied to enhance both specific capacitance and stability of supercapacitors. Herein, a best performance (about 320 F/g) of Ni–Co bimetallic MOF was found in a uniform preparation condition by adjusting the ratio of Ni to Co. Then tiny third metal ion was introduced, and we found that the morphology of material has a significant change on the original basis. Furthermore, certain ions (Zn, Fe, Mn) introduced make a huge improvement in capacitance based on Ni–Co MOF of 320 F/g. The result shows that Zn–Ni–Co MOF, Fe–Ni–Co MOF and Mn–Ni–Co MOF perform specific capacitance of 1135 F/g, 870 F/g and 760F/g at 1 A/g, respectively. Meanwhile, the asymmetric supercapacitor (ASC) was constructed by Zn–Ni–Co MOF as positive electrode and active carbon (AC) as negative electrode. The Zn–Ni–Co MOF//AC ASC possesses a energy density of 58 Wh/kg at a power density of 775 W/kg. This research provides a new methods to regulate the morphology of MOF and a novel viewpoint for assembling high-performance, low-price, and eco-friendly green energy storage devices.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 33
·17257-17265
·
IF 11.301
Yi Yang,Yu-xin Liu,Yan Li,Bo-wen Deng,Bo Yin,Ming-bo Yang
Nowadays, carbon nanomaterials are considered as the most important supercapacitor electrode materials. But it's still a great challenge to design rational structures of carbon materials at both nano and micro scales to endow carbon electrode materials with outstanding electrochemical performance. Herein, a well-designed compressible and elastic N-doped porous carbon nanofiber aerogel (N-PCNFA) with hierarchical cellular structures in both the PAN/ZIF-8-based carbon nanofibers and the 3D carbon monolith was prepared by a simple method. A large specific surface area was obtained for the construction of abundant pore structures and a robust architecture was built by the introduction of mechanically reinforced structures, which would endow the N-PCNFA electrode material with a vast surface area for ion adsorption/desorption, plenty of short channels for electrolyte diffusion and stable frameworks during the charge/discharge process. N heteroatoms were also incorporated into the carbon material as active sites for faradaic redox reactions. Thus, the N-PCNFA electrodes exhibited superior electrochemical performance, with a high specific capacitance of 279 F g−1 at 0.5 A g−1, consisting of pseudocapacitance (∼46%) and electrochemical double-layer capacitance (∼54%), remarkable rate performance of 59% at 20 A g−1 and excellent long-term durability. Moreover, the simple and general strategy for construction of compressible and elastic porous carbon nanofiber aerogels with delicate microstructures is also applicable to other advanced functional materials for a wide range of applications.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2018
·
IF 2.21
Beirong Ye,Miaoliang Huang,Si Jiang,Leqing Fan,Jianming Lin,Jihuai Wu
In this paper, Se-doped NiTe electrode materials for supercapacitor are synthesized through a one-step hydrothermal method by using Ni foam as Ni source and substrate. The as-obtained Se-doped NiTe electrode exhibits maximum specific capacitance of 998.2 F g −1 at the current density of 1 A g −1 , which is better than the value of NiTe electrode 603.6 F g −1 . Moreover, the Se-doped NiTe electrode assembled with AC electrode to form an asymmetric supercapacitor (ASC), which can extend the potential window to 1.6 V, and possesses of a superior energy density and power density of 42.7 Wh kg −1 and 800.6 W kg −1 at the current density of 1 A g −1 , respectively. In addition, the ASC shows an outstanding cycling stability (76.4% retained after 10,000 cycles).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2022
·
IF 3.806
Junjie Ding,Wenwen Zhao,Sen Liu,Hui Wang,Qiyu Mu,Zixu Huang,Yi Zhao,Guijing Liu,Ling Wang,Wenlong Xu
One of the effective ways to improve the electrochemical performance of supercapacitors is to fabricate a combined electric double layer capacitor (EDLC)-pseudocapacitance system. In this study, we synthesized the composite material FeCo 2 O 4 @PC by hydrothermal method , which can enhance the electrochemical performance of supercapacitors by the synergetic effect of EDLC and pseudocapacitance mechanisms. A series of physical characterizations including X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM) were used to demonstrate the successful compositing of FeCo 2 O 4 @PC. And FeCo 2 O 4 @PC was used for the testing of supercapacitor and the electrochemical performance was evaluated by cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD). The results show that the composite FeCo 2 O 4 @PC-5 possesses larger specific capacitance and excellent rate capability. This further confirms that the composite of the two materials can overcome their respective shortcomings and improve the overall capacitive performance of the electrode. The composite electrode material FeCo 2 O 4 @PC has great application potential and prospects in the field of supercapacitors.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 50
·期 3
·1097-1105
·
IF 4.174
Yaju Zhou,Chunyan Li,Xin Li,Pengwei Huo,Huiqin Wang
Highly dispersed nitrogen doped carbon (N–C) is decomposed by 2-methylimidazole (C4H6N2) and is used as a composite material with nickel cobaltite (NiCo2O4). The N–C and NiCo2O4 composites are obtained by a one-step hydrothermal method and subsequent calcination. In addition, N–C is used to control the morphology and structure of NiCo2O4 to obtain excellent capacitor materials. The N–C/NiCo2O4 electrode shows an excellent specific capacitance of 157.97 mA h g−1 (1263.75 F g−1) at 1 A g−1. Herein, we successfully develop a N–C/NiCo2O4//AC asymmetric supercapacitor (ASC), which is prepared using N–C/NiCo2O4 as a cathode coupled with activated carbon (AC) as an anode at a voltage of 1.6 V. The prepared N–C/NiCo2O4//AC device shows an excellent volumetric energy density of 66.44 mW h kg−1. The promising performance of N–C/NiCo2O4//AC illustrated its potential for portable supercapacitor applications.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）