Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 16
·7819-7827
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IF 11.301
Yuanyuan Zhu,Xu Ji,Lufeng Yang,Jin Jia,Shuang Cheng,Hailong Chen,Zhong-Shuai Wu,Donata Passarello,Meilin Liu
Mo2C is one of the few compounds that possess good electronic conductivity. Meanwhile, it possesses a natural 1D zigzag tunnel structure that is ideally suited for fast ion diffusion. Here, an effective approach is demonstrated for fabrication of structurally stable N-doped Mo2C/C nanobelts. They demonstrate high and fast energy storage ability with initial capacitances of 1139 C g−1 at 1 mV s−1, 151 C g−1 at an extremely high scan rate of 2000 mV s−1 and 208 C g−1 at a discharge current density of 200 A g−1. After electrochemical activation of cycling, the capacity is continuously enhanced and much higher capacitances of 2523 C g−1 at 1 mV s−1 and 1403 C g−1 at 50 A g−1 are achieved after 15 000 cycles at 50 mV s−1. Using the power law, it is evaluated that a surface-controlled capacitive process makes the main contribution to the capacity, which is over 90% when the scan rates are higher than 10 mV s−1 and still high as 73% at 1 mV s−1. From in situ synchrotron XRD, it is found that there is a negligible change in the crystal structure and volume during charging/discharging, reflecting an insertion-type charge storage mechanism.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Honglong Qu,Tiantian Cao,Qiaolin Li,Gang Chen,Hongtao Guan,Chengjun Dong
Reasonably tuning the structure of Ni 2 P based complex electrode is decisive to boost its applications in supercapacitor. Herein, we demonstrate the design and preparation of NiMoO 4 @Ni 2 P nanosheet arrays with unique core–shell architecture on Ni foam (NF) for pseudocapacitor. The directly grown Ni–MOF on NF was used to couple with NiMoO 4 via an ion exchange between BDC 2− and MoO 4 2- , which is crucial to form a stable NiMoO 4 @Ni 2 P/NF core–shell structure during the subsequent phosphatization. The NiMoO 4 @Ni 2 P/NF electrode can deliver a high capacitance of 3655.1 mF cm −2 at 1 mA cm −2 with a remarkable cycling stability (95.35 % over 4000 cycles). Additionally, the assembled NiMoO 4 @Ni 2 P/NF–2//AC/NF device achieves a stable working voltage of 1.7 V and delivers a superior energy density of 0.155 m Wh cm −2 at a power density of 1.705 mW cm −2 . The outstanding performance of pseudocapacitor is mainly ascribed to the stable diffusion channel, rich reactive species and hetero–interface, enabling fast electrochemical reaction kinetics.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 49
·39270-39277
·
IF 3.84
Maiyong Zhu,Xin Zhang,Yong Zhou,Changhui Zhuo,Juncheng Huang,Songjun Li
A facile and cost-effective solvothermal approach to the fabrication of ZnFe2O4 microspheres composed of nanocrystals has been developed. The morphology and structure of the products were characterized by X-ray powder diffraction, transmission electron microscopy, and field-emission scanning electronic microscopy, and N2-adsorption–desorption. Meanwhile, the magnetic properties of the product were investigated via vibrating sample magnetism. Finally, the electrochemical performance of the obtained ZnFe2O4 microspheres was measured by cyclic voltammetry and galvanostatic charge–discharge techniques. The results show that such structured ZnFe2O4 has a specific capacitance of 131 F g−1 and stable cycling performance with 92% capacitance retention after 1000 cycles, which make it have a potential application as a supercapacitor electrode material.
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 Materials Chemistry A
·
2015
·Vol. 3
·期 33
·17217-17223
·
IF 7.443
Liang Huang,Xiang Gao,Qiang Dong,Zhimi Hu,Xu Xiao,Tianqi Li,Yongliang Cheng,Bin Yao,Jun Wan,Dong Ding,Zheng Ling,Jieshan Qiu,Jun Zhou
Pseudocapacitors, which store charge through fast reversible redox reactions occuring at the surface of the electrode, could offer higher specific capacitance than electrochemical double-layer capacitors (EDLCs). However, the prime pseudocapacitive phase, transition metal oxides usually have poor electronic conductivity, limiting their practical application. Here, we fabricated highly conductive HxMoO3−y nanobelts as electrode materials for pseudocapacitors. This electrode has demonstrated great electrochemical activity in various aqueous cation solutions with the highest volumetric capacitance of over 350 F cm−3. Significantly, this electrode has high specific capacitance as well as excellent cycling stability in sea water. Moreover, this hybrid composite also exhibits remarkable ion electrosorptive capacity (4 mg g−1) as a desalination electrode.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2019
·
IF 7.466
Xiaocong Tian,Kang Tang,Hongyun Jin,Teng Wang,Xiaowei Liu,Wei Yang,Zhicheng Zou,Shuen Hou,Kun Zhou
Micro-pseudocapacitors (MPCs) are prospective power source candidates with compatible sizes as well as superior power densities for miniaturized electronic devices; however, their limited capacitive charge storage characteristics are still hindering their further development. Herein, an optimized 3D printing technique is employed to build remarkable reduced holey graphene oxide (rHGO) supported MPC microelectrodes. In such microelectrodes, the presence of macroscale pores introduced through freeze drying is beneficial to the accessibility to electrolyte ions . Moreover, with two additional pore modals including the microscale pores from pseudocapacitive nanoparticles stacking and nanoscale in-plane holes formed by rational HGO engineering, the MPC microelectrodes offer an enhancement in both electrical and ionic transports. The resultant 3D-printed planar MPCs exhibit a remarkable device specific charge storage capacity of 241.3 mC cm −2 , which is approximately 1.7-fold that of a non-optimized one and much higher than most reported planar micro-supercapacitors. Superior rate capability and high capacity retention (91% capacity retention after 11000 charge and discharge cycles) are also achieved. Our porosity engineering strategy combined with 3D printing is expected to serve as a facile and general design in the roadmap for next-generation state-of-the-art customized electrochemical energy storage devices.
研究领域:
材料科学
·
电化学储能
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2014
·
IF 5.211
Xuefei Gong,J.P. Cheng,Fu Liu,Li Zhang,Xiaobin Zhang
Nickel–Cobalt hydroxide microspheres are electrodepositioned on the films of NiCo 2 O 4 nanowires grown on the current collector through a facile approach and the hierarchical structures are then investigated as an electrode material for high-performance supercapacitors . Owing to the superior electrical conductivity of NiCo 2 O 4 nanowires, the porous structure of the (Ni–Co)(OH) 2 microspheres and the synergic effect of the multi-components, the electrode can deliver a high areal capacitance of 6 F cm −2 and a corresponding specific capacitance of 1132 F g −1 at a current density of 2 mA cm −2 , as well as a good rate capability (61.8% capacitance retention from 2 mA cm −2 to 50 mA cm −2 ), and excellent cycling stability (90% capacitance retention after 2000 cycles). The results suggest that our research opens up the possibility for the fabrication of high-performance energy-storage devices of binder-free electrodes.
研究领域:
材料科学
·
能源存储
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Xiangcun Li,Le Wang,Jianhang Shi,Naixu Du,Gaohong He
Nickel–cobalt oxides/hydroxides have been considered as promising electrode materials for a high-performance supercapacitor. However, their energy density and cycle stability are still very poor at high current density. Moreover, there are few reports on the fabrication of mixed transition-metal oxides with multishelled hollow structures. Here, we demonstrate a new and flexible strategy for the preparation of hollow Ni–Co–O microspheres with optimized Ni/Co ratios, controlled shell porosity, shell numbers, and shell thickness. Owing to its high effective electrode area and electron transfer number (n3/2A), mesoporous shells, and fast electron/ion transfer, the triple-shelled Ni–Co1.5–O electrode exhibits an ultrahigh capacitance (1884 F/g at 3A/g) and rate capability (77.7%, 3–30A/g). Moreover, the assembled sandwiched Ni–Co1.5–O//RGO@Fe3O4 asymmetric supercapacitor (ACS) retains 79.4% of its initial capacitance after 10 000 cycles and shows a high energy density of 41.5 W h kg–1 at 505 W kg–1. Importantly, the ACS device delivers a high energy density of 22.8 W h kg–1 even at 7600 W kg–1, which is superior to most of the reported asymmetric capacitors. This study has provided a facile and general approach to fabricate Ni/Co mixed transition-metal oxides for energy storage.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xiaoxu Xu,Zhaoqing Lu,Li Hua,Jiayue Dong,Zizhan Guo,Yajie Kou,Jinlong Wu,Hang Yu,Yuanming Wang
Micro-supercapacitors (MSCs) are gradually emerging as a strong contender for the next wearable and portable micro-energy storage devices. Low energy density and poor stability are significant challenges to their widespread application. Based on this, a novel asymmetric all-solid-state Micro-pseudocapacitors (AMPCs) is designed elaborately, in which all the active materials are based on conducting two-dimensional (2D) materials with thin lamellar thickness and active covalent groups on the surface. The positive electrode was made of covalently graft-modified GO with p-phenylenediamine (PrGO), while the negative electrode was made of MXene material. Besides, electrochemically exfoliated graphene (EG) was incorporated into the positive electrode to further improve the electrochemical performance of the PrGO@EG hybrid film electrode due to its excellent conductivity and favorable π-π stacking effects. As a result, the PrGO@EG-30 % electrode demonstrates a high specific capacity of 571 F cm −3 (411 F/g) and maintains excellent stability, retaining 100 % of its capacity even after 10,000 cycles. Surprisingly, the assembled-designed PrGO@EG//MXene AMPCs achieved remarkable electrochemical performance in solid-state electrolytes with a notable capacity of 185.4 F cm −3 (84.6 F/g), impressive stability with 100 % retention after 10,000 cycles, and outstanding volumetric energy density up to 50.5 μWh cm −3 , exceeding the majorities of other state-of-the-art MSCs. Moreover, the microdevices can be easily integrated and electrochemically stable under various bending conditions, demonstrating their significant potential as flexible micro-energy storage devices.
研究领域:
材料科学
·
能源存储技术
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 21
·19477-19486
·
IF 2.195
Xu Chen,Feng Yan,Mao Zemin,Zhou Yingjie,Liu Li,Cheng Weihao,Wang Jinpei,Shi Hao,Liu Xiang
Metal–organic frameworks as electrode materials have attracted significant attention due to their high specific surface area and flexible structures. Compared with the metal–organic frameworks derived products, the direct applications of metal–organic frameworks as electrode materials are rather seldom because of their insufficient conductivity. Herein, binary nickel–cobalt based metal–organic frameworks are developed as electrode materials for supercapacitor. The binary metal based metal–organic frameworks behave better electrochemical performance than the sole metal base metal–organic frameworks, and this is majorly due to the synergistic effect between the binary metals. The highest capacitances of 978.9 F g −1 at 1 A g −1 at a nickel/cobalt ratio of 2:4 can be obtained. Meanwhile, the nickel–cobalt metal–organic framework presents excellent stability even after being run for 3000 cycles. The Ni–Co-2-4-MOF//AC asymmetric capacitor shows a high energy density of 14.77 Wh kg −1 and power density of 8477 W kg −1 . These results show that Ni–Co-MOFs have a promising applications in supercapacitor electrode.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Wangda Qu,Pengyu Hu,Jing Liu,Hong Jin,Keliang Wang
Lignin-based carbon fiber (LCF) is originally developed to substitute PAN-based CF for structural applications. Nevertheless, the intrinsic heterogeneous structure of lignin renders the derived LCF with relatively inferior mechanical properties. The mechanical properties as well as other features (sustainable precursor, small diameter, good scalability, low-cost, high flexibility, etc.), however, is promising for functional applications such as fiber-shaped electrodes. In this work, LCF was produced from 100% lignin via melt-spinning, stabilization, and carbonization . The LCF shows high tensile strength of 401 MPa with superior flexibility. To develop the fabrication strategy of LCF-based pseudocapacitors , the mechanism of polyaniline (PANI) electrochemically depositing on LCF was investigated. It was found low CV scan rate (10 mV s −1 ) was necessary to allow the well-distributed deposition of PANI on LCF. Electrochemical tests prove that LCF-PANI can be used as a low-cost but high-performance electrode, which delivered high areal specific capacitance of 136.26 mF cm −2 at 0.19 mA cm −2 . Upon assembling, the device can be bended and twisted (real-time) at arbitrary angles without sacrificing its capacitance. This work is the first attempt to apply LCF towards the fiber-shaped pseudocapacitor electrodes and will define further opportunities for LCF valorization.
研究领域:
材料科学
·
能源存储
·
可持续发展
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jiawei Wang,Mingzhao Li,Yi Zhai,Fumin Wang,Xubin Zhang,Huihui Lv,Tiantian Yu,Weike Zhang
Constructing porous three dimensional (3D) structure is an effective strategy for electrode materials to solve the urgent problem of low utilization of active sites in pseudocapacitors. Herein, the in situ scaffolding formation of well-distribute 3D NiFe Prussian blue analogue (NiFe PBAs) nanocubes penetrated 2D NiFe-layered double hydroxides (NiFe LDHs) on stainless steel mesh (SS) are synthesized, and then the precursors are transferred into 3D oxide arrays (SS@NiFe NSs@NiFe NCs) via thermal annealing in air. The 3D arrays show high specific surface area as well as excellent electrochemical performance including a high specific capacity and an outstanding cycling performance. Density functional theory (DFT) is also used to investigate reasons for the enhanced electrochemical performance of SS@NiFe NSs@NiFe NCs, and results show that the self-built heterointerfacial can form a long-range continuous interfaces, thereby increasing the conductivity and facilitate the charge transfer. In addition, a hybrid supercapacitor (HSC) SS@NiFe NSs@NiFe NCs//SS@Fe 2 O 3 device is assembled and show an impressive electrochemical performance. This work gives a new insight for rational design of 3D PBA-based functional nanomaterials and can be used to explore the mass transfer mechanism of supercapacitor based on the special open structure of PBAs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 12
·16866-16880
·
IF 2.478
Chen Han Xiang,Gui Yang
We report a template method by rationally designing a self-supported Ni 3 S 2 nanosheet-wrapped ZnO nanorod (Ni 3 S 2 @ZnO) standing vertically on Ni foam surface. In this work, an organic molecule of 2-methylimidazole (2-MI) using as a structural director, which is commonly used in metal–organic frameworks(MOFs), has been adopted to link those Ni 3 S 2 nanosheets forming a shear-wall structure. This special morphology with multi-dimension (2D with 1D) exhibits advantages on the high capacitance of about 3546 F g −1 at a current density of 0.5 A g −1 . Besides this, Ni 3 S 2 @ZnO can deliver an extraordinarily capacitance of 1872 F g −1 even at a high current density of 25 A·g −1 , which in the meantime displayed a good capacity retention of 70.3% after 10,000 cycles. An asymmetric supercapacitor was then constructed, performing a quite stable capacitance of about 197 F g −1 at a high current density of 15 A g −1 for 5000 cycles and a sufficient energy density of 140 Wh kg −1 , which proves its potential on lighting up six red LEDs in practical usage.
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）