ENERGY & FUELS
·
2022
·
IF 4.654
Guodong Zhang,Weiqiang Cao,Haixia Zhang,Ying Hou,Junjie Guo
Polypyrrole (PPy) has great potential for applications as a supercapacitor electrode owing to its excellent pseudocapacitance. However, the large volume changes during the rapid charge and discharge process lead to damage to the structure, which is the main obstacle to practical applications. Here, the core–shell structure composite composed of magnetic ferroferric oxide (Fe3O4) nanoparticles and PPy was prepared by solution polymerization. In the Fe3O4/PPy composite, Fe3O4 nanoparticles play the role of reaction template, which can be arranged in a line under a magnetic field, thereby starting the adhesion polymerization of PPy to form a stable core–shell structure with excellent capacitance. The as-synthesized Fe3O4/PPy electrode presents a significantly enhanced specific capacitance of 697 F g–1 at 1.0 A g–1. In particular, the as-synthesized Fe3O4/PPy composite achieved a high energy density of 96.8 Wh kg–1 at 500 W kg–1. This study paves a way to develop materials with high electrochemical performance and may promote the practical application of high-capacity energy storage materials.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2020
·
IF 3.762
Chen Zhang,Aijuan Xie,Wanqi Zhang,Jianing Chang,Chenyang Liu,Linyang Gu,Xiaoxiao Duo,Fei Pan,Shiping Luo
Copper manganese oxide-graphene (CuMn 2 O 4 -RGO) composite was prepared by sol-gel method and then synthesized by physical grinding, which was further applied to electrode materials for supercapacitors. The structure and morphology of the composites were analyzed by means of characterization, such as X-ray diffraction (XRD), Fourier transform infrared (FT-IR), scanning electron microscope (SEM), transmission electron microscopic (TEM), X-ray photoelectron spectroscopy (XPS), thermogravimetric (TG) analysis, and Raman. The electrochemical tests including cyclic voltammetry (CV), galvanostatic charge-discharge, electrochemical impedance spectroscopy (EIS) and cyclic life were used to investigate electrochemical properties of CuMn 2 O 4 -RGO so as to optimize its composition. Through the comparison of electrochemical properties at different mass ratios, current densities and scan rates, it was found that when the mass ratio was m (CuMn 2 O 4 ): m (RGO) =1:1, the as-prepared CuMn 2 O 4 -RGO exhibited the excellent electrochemical properties. The capacitance reached 342 F g −1 at the current density of 1.0 A g −1 , which was significantly higher than that of pure CuMn 2 O 4 and RGO. The higher capacitance performance can be comparable with the reported literature value. Meanwhile, the energy density of CuMn 2 O 4 -RGO (1:1) is significantly higher than that of CuMn 2 O 4 and RGO. Therefore, CuMn 2 O 4 -RGO (1:1) composite has a good prospect as electrode material for supercapacitor.
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 SOLID STATE ELECTROCHEMISTRY
·
2024
·
IF 2.6
Yan Yue,Wu Wenrui,Tian Xinyu,Wei Chengzhi,Xu Tao,Li Xianfu
Optimizing the performance of layered double hydroxide (LDH) electrodes by MXene is of significant importance for high-performance asymmetric supercapacitors. In this paper, CoAl-LDH nanosheet-doped s-MXene composites were prepared by a facile hydrothermal method, and two-dimensional layered microstructured CoAl-LDH/s-MXene electrode materials with excellent performance were prepared. The homogeneous growth of CoAl-LDH on s-MXene successfully hinders the agglomeration of CoAl-LDH and provides more layered channels for electron and ion transfer across the electrode material. In addition, CoAl-LDH can effectively suppress the stacking of s-MXene, which increases the electrochemical active site of the material, resulting in an increase in specific capacity. The CoAl-LDH/s-MXene electrode material has a high specific capacity of 1259.9 C g −1 at 1 A g −1 , which has outstanding specific capacity and rate capability. The assembled asymmetric CoAl-LDH/s-MXene//AC supercapacitor achieves the desired energy density of 104 and 88 Wh kg −1 at 1500 and 6000 W kg −1 . After 5000 laps at 10 A g −1 , CoAl-LDH/s-MXene//AC has a capacitance retention rate of 86.6% and a coulomb efficiency of nearly 100%, demonstrating its splendid cycling stability. Therefore, this paper adopts a simple hydrothermal method to prepare CoAl-LDH/s-MXene active material, which provides an effective strategy for constructing supercapacitors with excellent performance. Graphical abstract
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
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xing Gao,Tao Shi,Lei Zu,Huiqin Lian,Xiuguo Cui,Xiaodong Wang
Aqueous zinc-ion batteries (ZIBs) are regarded as a type of promising energy-storage device because of their high safety and low cost, and polyaniline (PANI) is normally employed as a cathode material for ZIBs owing to its unique electrochemical properties and high environmental stability. However, a low specific capacity and a short cycle life limit the development and applications of PANI-based electrodes. Herein, we have developed a novel type of highly stable PANI-based cathode material enabled by phosphene (PR) for aqueous Zn-PANI batteries through in situ chemical oxidative polymerization. The introduction of PR nanoflakes not only inhibits the degradation of PANI and generates more active sites for Zn2+ storage but also enables a synergistic effect of the Zn2+ insertion/extraction and P–Zn alloying reaction. This promotes a high reversible specific capacity of 240.2 mAh g–1 at 0.2 A g–1 and excellent rate performance for the PR/PANI nanocomposite cathode material. Compared to the pristine PANI cathode material, the PR/PANI nanocomposite cathode material is more suitable for the Zn-PANI battery, thanks to its higher specific capacity and better cycle stability. This study provides an innovative approach for developing the next generation of reliable PR-based electrode materials for aqueous energy-storage devices.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jiuli Chang,Wenfang Liang,Wenyu Wang,Dapeng Wu,Kai Jiang,Gongke Wang,Fang Xu,Zhiyong Gao
Aqueous alkaline batteries (AABs) represent a prospective category of rechargeable energy devices that can ensure both high energy and power densities. The high capacity negative material is urgently needed to match with the positive electrode and maximize the overall charge storage ability of AAB. Herein, an oxygen vacancies (O v ) enriched Bi 2 O 3 was prepared as efficient negative material for AAB via solvothermal hydrolysis of Bi salt and calcination in inert atmosphere. The resultant Bi 2 O 3 electrode demonstrated high specific capacity ( C s ) of 249 mAh g −1 at 1 A g −1 and ultrahigh rate capability (230 mAh g −1 at 10 A g −1 ) in a wide negative potential range, which was higher than those of other battery materials. When paired with Co, Ni layered double hydroxide (CoNi-LDH) positive electrode, the AAB based on the Bi 2 O 3 negative electrode delivered high energy density ( E cell , 87.1 Wh kg −1 at power density ( P cell ) of 1037 W kg −1 ) and good durability, manifesting the potential of O v enriched Bi 2 O 3 in battery typed charge storage.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Jing Luo,Qiang Ma,Huahao Gu,Yuan Zheng,Xiaoya Liu
A novel kind of three-dimensional graphene-polyaniline hybrid hollow sphere (RGO-PANI HS) has been prepared via layer-by-layer (LBL) assembly of negatively-charged reduced graphene oxide (RGO) and positively charged polyaniline (PANI) on polystyrene (PS) microsphere , followed by the removal of the PS template. The hollow structure of the obtained RGO-PANI HS is confirmed by transmission electron microscopy (TEM). When used as the electrode materials for supercapacitor , the specific capacitance of the RGO-PANI HS reaches 381 F/g at a current density of 4.0 A/g, which is much higher than 251 F/g of the stacked RGO-PANI LBL film. The higher specific capacitance of RGO-PANI HS should be attributed to its unique hollow structure which provides a larger accessible surface area and facilitate the charge and ion transport. In addition, its specific capacitance can be facilely tailored by changing the assembly cycle number. Furthermore, good cycling stability is also demonstrated with 83% of the original capacitance value maintained after 1000 charging/discharging cycles.
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
·
2017
·
IF 4.798
Tongkun Zhao,Jiakui Zhang,Zheng Du,Yahua Liu,Guoli Zhou,Jingtao Wang
Two-dimensional transition metal carbides, MXenes, with large surface area, excellent electrical conductivity and chemical stability, have proved promising for energy storage. However, the irreversible re-stacking and low capacity of MXenes restrict their development and practical applications. Here, the N-doped carbon decorated MXene (Ti 3 C 2 T x @NC) composites were synthesized via an in-situ self-polymerization of dopamine on the surface of Ti 3 C 2 T x followed by a carbonization process. The Ti 3 C 2 T x and Ti 3 C 2 T x @NC were systematically characterized, which have been manifested that NC were equably decorated on the surface and interlayer of Ti 3 C 2 T x sheets and a unique three-dimensional composited nanostructure was fabricated. Such nanostructure can confer both high surface area of NC layer and effective avoidance of the restacking of Ti 3 C 2 T x sheets, whilst, importantly, rendering the composites good conductivity and additional pseudocapacitance. As a result, the optimized Ti 3 C 2 T x @NC-2 composite exhibited a high specific capacitance of 442.2 F g −1 under a current density of 1 A g −1 , which is 281% higher than that of Ti 3 C 2 T x . As a further description, Ti 3 C 2 T x @NC achieved an excellent cycling stability with capacitance retaining 91.9% after 5000 cycles and a high rate capability of 92.5% at 10 A g −1 . Besides, the Ti 3 C 2 T x @NC-2-based symmetric supercapacitor presents a delighted energy density and power density. Therefore, the elaborately designed Ti 3 C 2 T x @NC composites provided a pregnant exploration for energy-related 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
·
2020
·
IF 6.215
Zhirong Zhang,Zhongping Yao,Xiao Zhang,Zhaohua Jiang
MXene, as an emerging class of conductive two-dimensional materials, have extraordinary applications in the field of electrochemical energy storage . However, the intrisic capacity of MXene still need to be improved due to the large gap to their theoretical capacity. Here, we provide a facile and new strategy to enhance their electrochemical performance—postetch low-temperature annealing (below 400 °C) under Ar atmosphere. Due to the formation of more C-Ti-O active sites and larger interlayer voids, the Ti 3 C 2 T x freestanding film annealed under 200 °C exhibits a high capacitance of 429 F/g and energy density of 29.2 Wh/Kg in 1 M H 2 SO 4 electrolyte, it could withstand 5000 cycles with 89% of the capacitance retention. By comparison, the Ti 3 C 2 T x annealed at higher temperature (400 °C), presented a high resistance and poor electrochemical property because of partial oxidation and breaking of Ti-C bond on the surface of MXene nanosheets , despite the larger interlayer voids and low –F contents, . This work is not only probing the importance to maintain the original structure of MXene but also proposing a new strategy to realizing a high capacitance of pure MXene electrode.
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 Energy Storage
·
2024
·
IF 8.9
Lupeng Zhang,Wen Liu,Chenxi Liang,Yiyang Liu,Haining Wang,Shanfu Lu,Yan Xiang
Potassium-ion batteries (PIBs) have garnered considerable interest for promising stationary energy storage devices. However, the current researches of carbon anode for PIBs still face the severe challenge of low areal capacity, unsatisfactory kinetics rate and low initial coulombic efficiency from the practical application perspective. To solve these issues, we design Fluorine-doped Typha orientalis fibre (FTOF) membrane by constructing integrated architecture and regulating electronic structure, and this FTOF membrane is used as freestanding carbon anode. This novel carbon anode not only retains integrated architecture with bamboo-like microfiber, but also presents abundant F-doped site and vacancy defects. As a result, the FTOF electrode delivers high areal capacity (1.12 mAh cm −2 ) with initial coulombic efficiency (62.5 %), stable cycling performance (0.41 mAh cm −2 after 500 cycles) and excellent rate performance (0.50 mAh cm −2 at 4 mA cm −2 ), overmatching most of the reported studies. Theoretical calculations on K adsorption affinities at various configurations illuminate the synergistic effects of F-doping and vacancy defects in improving K + adsorption kinetics. Moreover, full cells deliver superior cycling performance with high capacity retention of 90.2 % after 1000 cycles. This work provides a rational electrode design strategy and theoretical guidance to achieve ultra-high areal capacity carbon anode for PIBs.
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
Frontiers in Chemistry
·
2020
·
IF 3.693
Zhang Dong,Gao Hongquan,Hua Guomin,Zhou Haitao,Wu Jianchun,Zhu Bowei,Liu Chao,Yang Jianhong,Chen De
Carbon-ionic liquid (C-IL) supercapacitors (SCs) promise to provide high capacitance and high operating voltage, and thus high specific energy. It is still highly demanding to enhance the capacitance in order to achieve high power and energy density. We synthesized a high-pore-volume and specific-surface-area activated carbon material with a slit mesoporous structure by two-step processes of carbonization and the activation from polypyrrole. The novel slit-pore-structured carbon materials provide a specific capacity of 310 F g−1 at 0.5 A g−1 for C-IL SCs, which is among one of the highest recorded specific capacitances. The slit mesoporous activated carbons have a maximum ion volume utilization of 74%, which effectively enhances ion storage, and a better interaction with ions in ionic liquid electrolyte, thus providing superior capacitance. We believe that this work provides a new strategy of engineering pore structure to enhance specific capacitance and rate performance of C-IL SCs.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
PubMed
高影响因子
IONICS
·
2022
·Vol. 28
·期 7
·3453-3460
·
IF 2.961
Chen Fuhua,Guo Hao,Zhao Lili,Chu Ying,Wang Xueying,Zhu Yongping
Traditional cathode materials can no longer meet the development needs of thermal batteries, and the research of new cathode materials is imminent. In this study, WS 2 was successfully prepared by a simple one-step synthesis method. X-ray photoelectron spectroscopy (XPS) showed that it has good electrical conductivity, its bandgap had been calculated by ultraviolet–visible diffuse reflectance spectroscopy (UV-visDRS), and its thermal decomposition temperature exceeded 1000 °C by thermogravimetric (TG) analysis. Due to the high decomposition temperature and high electronic conductivity of WS 2 , LiBr–LiCl–LiF electrolyte with high ionic conductivity but the high melting point was selected. The structure and composition of WS 2 and LiBr–LiCl–LiF after reaction at high temperature (500 °C) were studied, and WS 2 was found to have good compatibility with ternary lithium electrolyte. Assembling Li–B/LiBr–LiCl–LiF/WS 2 single thermal battery, the discharge specific capacity is 952As g −1 at 300 mA cm −2 and cutoff voltage of 0.97 V. And the internal resistance of the single thermal battery is 11.87 mΩ under the super large pulse current density of 5A cm −2 . This further advances the application of WS 2 in thermal batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Omega
·
2025
·
IF 4.3
Zhihua Xu,Yu Wu,Yangyang Zheng,Yucheng Chen,De Li,Wenting Ji,Yong Chen
As a well-known graphite-like material in superconductivity, lithium borocarbide (LiBC) can also be utilized as an electrode material in Li-ion batteries with a high specific capacity, which is assigned to the B–B bond produced through the aqueous reaction or the initial charge process. In this work, a rod-like LiBC sample (Ti-LiBC) is synthesized with the precursors of LiH + B + graphite in a sealed Ti tube through high-temperature sintering. Compared with the normal SUS-LiBC sintered in a sealed SUS304 tube, the Ti-LiBC possesses a lot of B–B bonds and a strong EPR signal, and it delivers a higher specific capacity (ca. 500 mAh g–1 at a mean discharge and charge potentials of 0.85 and 1.89 V, respectively) with excellent rate and cycle performances. Actually, the Ti metal can react with the H2 gas to produce the TiH2 phase at a high temperature, of which the extent determines the morphology of LiBC product, and the substitution of Li metal for LiH as the precursor can also result in the rod-like structure and the high specific capacity. Therefore, a hydrogen-free atmosphere is the key to synthesizing rodlike LiBC with excellent electrochemical properties, and this strategy might be extended to other graphite-like materials.
研究领域:
材料科学
·
电化学
✓ 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）