Scientific Reports
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2015
·Vol. 5
·期 1
·1-6
·
IF 5.578
Xiong Xiaoqin,Luo Wei,Hu Xianluo,Chen Chaoji,Qie Long,Hou Dongfang,Huang Yunhui
A flexible membrane consisting of MoS 2 /carbon nanofibers has been fabricated by a simple electrospinning method. MoS 2 nanosheets are uniformly encapsulated in the inter-connected carbon nanofibers with diameters of ~150 nm. When evaluated as a binder-free electrode for sodium-ion batteries, the as-obtained electrode demonstrates high performances, including high reversible capacity of 381.7 mA h g −1 at 100 mA g −1 and superior rate capability (283.3, 246.5 and 186.3 mA h g −1 at 0.5, 1 and 2 A g −1 , respectively). Most importantly, the binder-free electrode made of MoS 2 and carbon nanofibers can still deliver a charge capacity of 283.9 mA h g −1 after 600 cycles at a current density of 100 m A g −1 , indicating a very promising anode for long-life SIBs.
研究领域:
材料科学
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能源存储
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2020
·Vol. 217
·期 8
·1900806
·
IF 1.759
Jingbo Li,Yu Liu,Fang Xu,Junping Hu,Nan Chen,Guoping Du,Changshuang Jiang
As a 2D material, Ti 3 C 2 (MXene) has been recently used as electrodes for electrochemical capacitors. Herein, a two-step procedure is used to obtain a highly opened layer structure for Ti 3 C 2 , which differs from the methods used in the literature for synthesizing exfoliated MXene. First, the mild NH 4 HF 2 etching agent is used to prepare the regular Ti 3 C 2 MXene. Second, KOH is added into the obtained solution for K + to intercalate the MXene. The K + intercalation is found to greatly increase the (002) crystal planar spacing of the Ti 3 C 2 from 10.8 to 12.4 Å. More importantly, this K + -intercalated MXene exhibits a highly opened layer structure, whereas the regular MXene only has a partially opened layer structure. Consequently, the former is expected to allow much more active sites exposed to liquid electrolyte, and also facilitates remarkably higher ion and electron transport efficiency. To investigate their electrochemical capacitance properties, the regular and K + -intercalated Ti 3 C 2 MXenes are used to fabricate binder-free electrodes on nickel foams by an electrophoretic deposition method. The K + -intercalated MXene-based electrode is found to have twice higher specific capacitance than the regular MXene. Furthermore, the K + -intercalated Ti 3 C 2 MXene-based electrode exhibits an excellent cyclic stability.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
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2020
·
IF 5.289
Chengli Yao,Jianglin Xu,Anjian Xie,Yuhua Shen
Nowadays, developing new anode material for lithium-ion batteries (LIBs) with distinguished electrochemical properties is still very significant and a huge challenge. Herein, a nanocomposite containing Co 9 S 8 /carbon (C)/nickel foam (NF) was synthesized. In the preparation process, ZIF-67 as the source of both Co 2+ and carbon was designedly grown in situ on the surface of NF with loose porous skeleton through the hydrothermal reaction. After sulfurization and pyrolysis of ZIF-67/NF, the porous flower-like Co 9 S 8 /C/NF composites formed. As a binder-free anode, Co 9 S 8 /C/NF exhibited excellent lithium storage performance, which showed a superior initial discharge capacity of 1926 mA h g −1 and reversible capacity of 1114 mA h g −1 after 200 cycles at 0.2 A g −1 . Even at 2 A g −1 current density, it could maintain a capacity of 578 mA h g −1 . The above outstanding electrochemical performances may be due to the following reasons. The loose flower-like structure assembled by lots of nanosheets, can provide a larger surface area for the transport and storage of Li + ions. With the cooperation of carbon matrix, the volume expansion of anodes can be effectively alleviated during charge and discharge process. At the same time, metal nickel foam as the current collector of the negative electrode also can increase the conductivity; promote the transport and diffusion of electrons. The loose skeleton enables the full contact of the active material with the electrolyte, which is beneficial to the transportation of Li + ions and electronics. This work provides an inspiration for designing and fabricating anode materials with distinguished-performance for LIBs.
研究领域:
材料科学
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能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 7
·2125-2135
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IF 7
Xuguang Han,Yan Zhang,Mengmeng Liu,Yifei Sun,Wenshan Gou,Zhao Xu,Chang Ming Li
Vanadium oxide with abundant interchangeable oxidation states and a variety of different crystal structures is considered to be the most promising Zn-ion host material for high-performance aqueous zinc-ion batteries (AZIBs). Nevertheless, certain constraints, including poor reversibility, low intrinsic conductivity, sluggish electrochemical kinetics, low density of exposed active sites, and low actual capacity of the material, limit their performance in AZIBs. In this work, we in situ grew 3D amorphous mixed-valence VOx microspheres on alkali-treated carbon cloth (VOx MSs@ACC) as cathodes for AZIBs. In comparison with a VOx MSs powder-constructed cathode, VOx MSs@ACC cathodes exhibit higher specific capacity (1.79 mA h cm−2 at 2.7 A m−2) and longer cycling performance over 2500 cycles mainly due to their faster ion transport rates, abundant ion storage sites and more effective easing of volume expansion. This work thus sheds light on the design of free-standing vanadium-based cathodes for AZIBs.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Shiting Luo,Xiaoshan Lin,Limei Xu,Huicheng Guo,Jieyi Lai,Jianglun Wu,Yifei Feng,Lin Ma
In this work, a template-free hydrothermal strategy has been developed to fabricate 3D hierarchical MoS 2 microflowers on macroporous Ti mesh (MoS 2 MF-Ti) as a binder-free electrode for hydrogen evolution reaction (HER). It is found that the Ti mesh is able to provide an ideal platform for self-assembly of the MoS 2 nanosheets into the hierarchical microflowers. The as-prepared MoS 2 MF-Ti electrode is characteristic of meso/macro porous structures, abundant active edges and good conductivity. As a result, the MoS 2 MF-Ti demonstrates greatly enhanced electrocatalytic activity and stability toward HER due to its desirable structural features.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Jinwei Kang,Qingmei Su,Huagui Feng,Ping Huang,Gaohui Du,Bingshe Xu
Layered two-dimensional MoSe 2 has raised much interest in lithium/sodium ion batteries (LIBs/SIBs) due to its unique structure and high theoretical capacity. In this work, we have fabricated MoSe 2 @carbon cloth (MoSe 2 @CC) composites through an in situ hydrothermal approach followed by an annealing treatment. The as-synthesized MoSe 2 @CC composites are constructed by MoSe 2 nanoflowers anchored on CC network, which can be directly used as binder-free anodes for LIBs and SIBs. As an anode for LIBs, the MoSe 2 @CC performs excellent rate capacity (1337, 1092, 952, 831 and 749 mAh g −1 at current densities of 0.1, 0.2, 0.5, 1.0, and 2.0 A g −1 ) and super long-life cycling stability (638 mAh g −1 remains after 1200 cycles at 5 A g −1 ). As for SIBs, the MoSe 2 @CC electrode delivers a high initial discharge capacity of 839 mAh g −1 and excellent long-life cycling stability, retaining 202 mAh g −1 after 1000 cycles. Kinetics results indicate that the Li + and Na + storages in MoSe 2 @CC are both dominated by surface-based pseudocapacitive process, which greatly improves the rate performance of LIBs/SIBs. The CC provides a conductive network and an excellent utilization rate of the active material MoSe 2 to improve the electrochemical performance.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 49
·期 1
·263-272
·
IF 2.7
Yue Feng,Mingji Wu,Haiyan Zhu,Huirong Bao,Cheng Wang,Xiujing Lin,Ruiqing Liu,Xiaomiao Feng
The Ni-based metal–organic framework (Ni-MOF) shows significant potential for energy storage due to its high specific capacity and active sites for electrochemical reactions. This study investigates the microstructural control of NiBDC on indium tin oxide/polyethylene terephthalate (ITO/PET) by varying the electrodeposition time (NiBDC/ITO/PET). The resulting microstructure exhibits a well-ordered and uniform porous array, with NiBDC nanosheets growing into ultra-thin layers of 50 nm thickness. As an electrode material for flexible, binder-free all-solid-state supercapacitors, the NiBDC/ITO/PET electrode demonstrates optimal electrochemical performance at an electrodeposition time of 30 minutes. In a three-electrode configuration, the NiBDC/ITO/PET electrode material achieves an areal capacitance of 72.2 mF cm−2 at a discharge current density of 50 μA cm−2. Even after 2000 cycles, it retains over 90% of its initial capacity at a current density of 500 μA cm−2. The resultant symmetric supercapacitor device exhibits remarkable mechanical flexibility and robust cycling stability, maintaining over 87.8% of its initial specific capacitance after 5000 cycles. Moreover, three such devices connected in series can power a light-emitting diode (LED), demonstrating practical energy storage applications.
研究领域:
材料科学
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能源存储
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电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2018
·
IF 4.439
Hedong Jiang,Xingke Ye,Yucan Zhu,Lingling Wang,Peng Zhao,Ziyu Yue,Jianliang Xie,Zhongquan Wan,Chunyang Jia
Hierarchical porous carbon (HPC) as binder-free electrode attracts enormous attention due to its favorable structure, which is advantageous for the improvement of supercapacitor capacitance and rate capability. In this paper, texture controllable HPC binder-free electrode with high capacitive performance is successfully prepared by polymerization induced phase separation method. Solvents with various viscosities and hydroiodic acid with various amounts are used to regulate the texture. The desired hierarchical porous structure endows the carbon material with a high specific surface area and ideal transportation paths. The optimized HPC binder-free electrode reaches a high specific capacitance of 180.6 F g −1 at 0.2 A g −1 in a two-electrode configuration in 6 M KOH. Surprisingly, the capacitance of the electrode still remains 79.1% (142.9 F g −1 ) at 100 A g −1 . Furthermore, energy density of the supercapacitor device ranges from 6.27 Wh kg −1 to 4.23 Wh kg −1 with the power density ranging from 100 W kg −1 to 46195 W kg −1 .
研究领域:
材料科学
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能源存储
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
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2024
·
IF 8.9
Kanagaraj Rajalakshmi,Johnbosco Yesuraj,Selvaraj Muthusamy,N. Clament Sagaya Selvam,Yun Sik Nam,Kibum Kim,Yuanguo Xu
In recent times, transition-metal oxides have been recognized as highly promising candidates for supercapacitor applications. Nevertheless, their progress in diverse fields has been hindered by challenges such as poor electrical conductivity and a shortage of active reaction centers. Doping heteroatoms would overcome these drawbacks and enhance the supercapacitor properties in transition metal oxides. Herein, the phosphorous-doped 2D nanosheet assembled 3D Mn 2 V 2 O 7 micro flowers were grown on the Nickel foam using the hydrothermal method and successively phosphatized in a tube furnace, which was utilized as a binder-free supercapacitor electrode. The synthesis process involved varying the concentration of phosphorus (P), resulting in the successful formation of uniform P-decorated Mn 2 V 2 O 7 microflowers. The unique microflower structure and doping P into the Mn 2 V 2 O 7 material enhance the electrochemical properties with a specific capacity of 850C g −1 (1545 F g −1 ) at 1 A g −1 in a three-electrode cell. Moreover, the assembled Mn 2 V 2 O 7 –600/NF//AC device delivers a specific capacity of 258C g −1 (211 F g −1 ) at 1 A g −1 with a remarkable rate of 47 % at a high current density of 20 Ag −1 . The device achieved a maximum energy density of 43.2 Wh kg −1 at a power density of 604.7 W kg −1 , and it maintained 91 % of initial capacity after 10,000 charge/discharge cycles at 20 A g −1 . These results suggest that the P-doping 2D nanosheet assembled 3D Mn 2 V 2 O 7 could be promising electrode materials for supercapacitor applications.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zhihao Zhang,Hangjun Ying,Pengfei Huang,Shunlong Zhang,Zhao Zhang,TianTian Yang,Wei-Qiang Han
Silicon is an ideal anode candidate for next-generation lithium-ion batteries (LIBs) due to its high specific capacity, low working potential and abundant sources. However, its practical application is seriously hindered by its huge volume expansion, which leads to the destruction of the electrode structure and the short cycle life. Herein, we fabricated flexible self-supporting binder-free porous silicon/MXene-2:1 composite film (pSi/MXene-2:1 film) as anode for LIBs by vacuum filtration. The pSi possesses sheet-shape resulting from layered montmorillonite, which is beneficial to shorten ion transport length. Furthermore, the pSi/MXene-2:1 film possesses excellent mechanical flexibility and the voids in the structure can well accommodate the volume expansion during cycling. Benefitting from these advantages, the pSi/MXene-2:1 film anode shows steady cycling performance with 1039.3 mAh/g at 500 mA g −1 after 200 cycles and excellent rate performance with 840.3 mAh/g at 5 A/g. Furthermore, a high reversible capacity of 1201 mAh/g can be obtained at 1 A/g for pSi/MXene-2:1 || LiFePO 4 full cell. This work provides a strategy to fabricate high-capacity and long-cycle self-supporting silicon-based anodes for flexible LIBs.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
·
IF 3.218
Song Gao,Hongyu Mi,Zhiwei Li,Chenchen Ji,Luyi Sun,Chang Yu,Jieshan Qiu
Flexible supercapacitor (FSC), thanks to light weight, efficient power delivery and high safety, holds great potential in potable/wearable electronics, whose development would be accelerated by ideal electrode materials . Herein, we report a flexible binder-free electrode composed of polyaniline (PANI) nanofiber-lapped arrays in-situ grown on the molecular-modified carbon cloth (fCC) by a facile one-spot protocol. After optimization, PANI/fCC-2 electrode affords a high specific capacitance of 517.3 F g −1 at 1 A g −1 , benefited from highly pseudocapacitive PANI and open channels favorable for rapid ion/electron transfer. Using this novel electrode, flexible quasi-solid-state SC with PVA/H 2 SO 4 gel electrolyte displays a high energy density of 9.03 Wh kg −1 at a power density of 82.9 W kg −1 and is retained at 6.11 Wh kg −1 at 2784.3 W kg −1 , with excellent rate capability (97.4% capacitance retention from 0.5 to 20 A g −1 ) and good cycling stability (79.5% retention over 10,000 cycles). Besides, such four devices in series can light up a light-emitting diode (LED) indicator as a proof of concept in real applications. Our research would provide a promising avenue to develop flexible integrated electrode for next-generation high-performance devices.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Yiping Tang,Huanle Zhang,Jiquan Li,Guangya Hou,Huazhen Cao,Liankui Wu,Guoqu Zheng,Qingliu Wu
A novel three-dimensional ordered macroporous (3DOM) Cu/Fe 3 O 4 composite film was prepared by electrodepositing ferroferric oxide (Fe 3 O 4 ) on the 3DOM Cu current collector. Characterizations via electron microscopies and X-ray diffractions confirmed that achieved 3DOM Cu/Fe 3 O 4 composite inherited originally ordered porous structure, but has a layer of nanosized Fe 3 O 4 on the surface of the 3DOM Cu framework. The obtained 3DOM Cu/Fe 3 O 4 composite films were directly used as anodes of lithium ion batteries in the absence of conducting additives or binders. Results from electrochemical evaluations exhibited that the 3DOM Cu/Fe 3 O 4 anode could deliver a stable capacity of 800 mAh g −1 up to 400 cycles, while fast capacity degradation with 200 mAh g −1 retained after 100 cycles was observed on Fe 3 O 4 deposited on plane Cu substrate. The superior behavior of the 3DOM Cu/Fe 3 O 4 composite anode is ascribed to its unique porous structure, which provides sufficient space for large volume change of Fe 3 O 4 and greatly reduces the diffusion distance for Li-ion in the active material.
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
危险品化学品经营许可证（带存储）