ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yanfei Xin,Xin Dai,Guangjun Lv,Xuedong Wei,Sai Li,Zhiqiang Li,Tong Xue,Ming Shi,Kunyang Zou,Yuanzhen Chen,Yongning Liu
α-Ni(OH)2 is an ideal candidate material for a supercapacitor except for its low conductivity and poor stability. In this work, BO2–-intercalated α-NixCo(1–x)(OH)2 is synthesized by a hydrothermal method at a low cost. The Co dopant can decrease the charge-transfer resistance and enhance the cyclic stability. The special unsaturated electronic state of BO2– enhances the bonding with metal ions and attracts water molecules. Thus, the BO2– ions support the hydroxide layers as pillars and create efficient paths for proton transportation, optimizing the utilization of α-Ni(OH)2. The three-dimensional (3D) flowerlike morphology supplies an enormous number of active sites, and r-GO is added to improve the conductivity. As a result, the modified α-Ni(OH)2 exhibits the specific capacitance of 2179, 1592, and 1423 F·g–1 at 1, 20, and 40 A·g–1, respectively, showing improved rate performance. Matching with the commercial activated carbon (AC) as an anode, the asymmetric capacitor delivers an energy density of 40.66 W·h·kg–1 when its power density is 187.06 W·kg–1. Meanwhile, it retains 81.5% capacitance of the initial cycle at 5 A·g–1 after 3000 cycles. With conductivity enhanced and structure stabilized, the modified α-Ni(OH)2 confronts broader fields of application.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Handan Liu,Yanyan Liu,Dan Xu,Long Chen,Wen Guo,Tiantian Gu,Feng Yu,Gang Wang
Ti 3 C 2 T x , a member of the MXene, has attracted extensive interest because of its high conductivity, unique two-dimensional (2D) structure and intrinsic pseudocapacitance for supercapacitors. Flexible and freestanding Ti 3 C 2 T x films are promising electrodes for functioned supercapacitors used in wearable and portable electronic devices. However, the severe self-restacking of 2D Ti 3 C 2 T x nanosheets restraints their practical application. Herein, freestanding and flexible three-dimensional (3D) cross-linked Ti 3 C 2 T x -Ca-SA (sodium alginate) films with expanded Ti 3 C 2 T x interlayer spacing are reported. The expanded interlayer spacing allows more electrolyte ions to quickly intercalate providing more intercalation pseudocapacitance, while the 3D cross-linked microstructure ensures a continuous conductive network facilitating charges transport. Attributing to the unique structure, the Ti 3 C 2 T x -Ca-SA film delivers an outstanding areal capacitance (633 mF cm −2 at 5 mV s −1 ). Meanwhile, the assembled all-solid-state pseudocapacitor shows good flexibility and capacity stability under various bending conditions. The device exhibits a high energy density up to 12.6 µWh cm −2 at the power density of 375 µW cm −2 and excellent cycling stability, which are much better than prior reported state-of-the-art supercapacitors. This research exploits a simple method to optimize the structure of MXene as state-of-the-art electrodes for high-performance flexible energy-storage devices.
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Binbin Zhang,Xin Li,Jianli Zou,Franklin Kim
Diffusion-driven layer-by-layer (dd-LbL) assembly is a simple yet versatile process that can be used to construct graphene oxide (GO) into a three-dimensional (3D) porous framework with good mechanical stability. In particular, the oxygen functional groups on the GO surface are well retained, providing nucleation sites for further chemical reactions to be performed upon. Therefore, such a scaffold should serve as a promising starting material for creating a wide range of 3D graphene-based composites while maintaining a high accessible surface area. Herein, we demonstrate the use of the porous GO macrostructure derived from dd-LbL assembly for the preparation of graphene–MnCO3 hybrid structures. MnCO3 is a newly reported pseudocapacitive material for supercapacitors; however, its electrochemical performance is hampered by its low electrical conductivity and poor chemical stability. Through reaction between KMnO4 and GO during a hydrothermal process, the surface of the porous scaffold was rendered with uniform MnCO3 nanoparticles. With the reduced graphene oxide (rGO) sheets serving as the conductive backbone, the resultant MnCO3 nanoparticles exhibited a capacitance of 698 F g–1 at a charge/discharge current of 0.5 mA (320 F g–1 for the combined rGO and MnCO3 composite). Furthermore, the electrode maintained 77% of its initial capacity even after 5000 cycles of charge/discharge tests at 20 mA.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 5
·期 3
·1035-1042
·
IF 8.262
Ming Liu,Zhaojie Wang,Junxue Liu,Guijuan Wei,Jiao Du,Yanpeng Li,Changhua An,Jun Zhang
The synthesis of layered transition metal dichalcogenide nanocrystals with excellent properties in energy conversion and storage has been well documented in the past several years. However, due to the metallic character of Te, the realization of the chemical synthesis of uniform well-defined MoTe2 nanostructures still remains a challenge, especially to achieve metastable 1T′-MoTe2. In this work, we have developed a colloidal chemical strategy for the synthesis of ultrathin 1T′-MoTe2 nanosheets. The as-achieved sample was characterized by a layered-expanded feature with an interlayer distance of 0.723 nm and rich defects. The shapes of 1T′-MoTe2 can be controlled by varying Mo precursors and the reaction atmosphere, where CO plays an essential role in determining the nanosheet feature. Interestingly, the optimized few-layer 1T′-MoTe2 nanosheets can be used as an efficient supercapacitor electrode with specific capacitances of 1393 F g−1 and 714 F g−1 at current densities of 1 A g−1 and 100 A g−1, respectively. An asymmetric 1T′-MoTe2//activated carbon supercapacitor exhibits a maximum specific capacitance of 158.9 F g−1 with an energy density up to 56.4 W h kg−1. To the best of our knowledge, it is the first time that ultrathin MoTe2 nanosheets have been used as ideal electrode materials for supercapacitors. The present work highlights a facile synthetic strategy to realize uniform transition metal telluride nanostructures for enhancing their electrochemical performances.
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
·
2014
·Vol. 5
·期 12
·9221-9227
·
IF 3.708
Wei Ni,Jianli Cheng,Xiaodong Li,Guifang Gu,Ling Huang,Qun Guan,Demao Yuan,Bin Wang
For electrochemical capacitors or supercapacitors, pseudo-capacitors via fast surface reactions are able to store/harvest more electrical energy when compared with electrochemical double layer capacitors (EDLCs) using an ion adsorption route. A combination of pseudo-capacitive materials, including oxides, nitrides and polymers, as well as understanding the charge storage mechanism and the development of advanced nanostructures with the latest generation of nanostructured lithium electrodes has brought the energy density of electrochemical capacitors closer to that of batteries. Electroactive polymeric cathodes with designed structures via electrospinning (without polymeric additives) and surfactant-free precipitation polymerization routes were herein fabricated for the abovementioned goals. The as-prepared polymeric active materials show an electrochemical capacitance of around 200 F g−1 with a higher cut-off voltage up to 4.2 V and an energy density up to 370 Wh kg−1 and power density up to 34 kW kg−1 in an organic electrolyte system.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2020
·Vol. 7
·期 19
·2000831
·
IF 4.948
Zhilin Zhao,Xinming Wu
Multifarious layered electrode materials are attracting increased attention in the field of energy storage because of their high specific surface and interlayer modifiability. However, the natural tendency to be re-superimposed and the inherent disadvantages of a single layered electrode significantly affect electronic transport and ion migration. Considering the poor electrochemical performance and low structural stability, a novel MXene@PDDA/NiAl-LDHs hybrids as supercapacitor electrode via an electrostatic-assembled approach is elaborately designed. The alternate MXene and PDDA/NiAl-LDHs layers with 3D interconnected networks architectures could ensure intimate contact to efficiently take advantage of high electron conductivity of MXene and high pseudocapacitance activity of PDDA/NiAl-LDHs, thus effectively accelerating the ionic/electronic transport rates and improving the electrochemical storage of hybrid electrodes. As a consequence, as an electrode for supercapacitor, the MXene@PDDA/NiAl-LDHs exhibits a high specific capacitance of 1825.8 F g −1 at a current density of 1.0 A g −1 , a remarkable synergetic effect, leading to a high rate capability after 100 cycles at different current densities and long cycling stability with only 0.9% degradation after 5000 cycles at 5.0 A g −1 . This work provides a strategy for 2D layered materials to design electrodes with excellent electrochemical performance in the field of energy storage.
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
ADVANCED FUNCTIONAL MATERIALS
·
2016
·Vol. 26
·期 46
·8487-8495
·
IF 11.382
Jinfeng Cui,Yunlong Xi,Shuai Chen,Daohao Li,Xilin She,Jin Sun,Wei Han,Dongjiang Yang,Shaojun Guo
The increasing demand for efficient energy storage and conversion devices has aroused great interest in designing advanced materials with high specific surface areas, multiple holes, and good conductivity. Here, we report a new method for fabricating a hierarchical porous carbonaceous aerogel (HPCA) from renewable seaweed aerogel. The HPCA possesses high specific surface area of 2200 m 2 g −1 and multilevel micro/meso/macropore structures. These important features make HPCA exhibit a reversible lithium storage capacity of 827.1 mAh g −1 at the current density of 0.1 A g −1 , which is the highest capacity for all the previously reported nonheteroatom-doped carbon nanomaterials. It also shows high specific capacitance and excellent rate performance for electric double layer capacitors (260.6 F g −1 at 1 A g −1 and 190.0 F g −1 at 50 A g −1 ), and long cycle life with 91.7% capacitance retention after 10 000 cycles at 10 A g −1 . The HPCA also can be used as support to assemble Co 3 O 4 nanowires (Co 3 O 4 @HPCA) for constructing a high performance pseudocapacitor with the maximum specific capacitance of 1167.6 F g −1 at the current density of 1 A g −1 . The present work highlights the first example in using prolifera-green-tide as a sustainable source for developing advanced carbon porous aerogels to achieve multiple energy storage.
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
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yan Li,Jipeng Xu,Huibin Liu,Xuewen Hu,Qicheng Zhang,Wenchao Peng,Yang Li,Fengbao Zhang,You Han,Xiaobin Fan
Low-cost sodium-ion-based electrochemical energy storage devices, especially vanadium-based sodium-ion pseudocapacitors, are receiving increasing attention. However, the inevitable dissolution of vanadium in aqueous electrolytes usually leads to poor cycling stability and a narrow electrochemical stability window (ESW). In this study, we prepared layered (NH4)2V10O25·8H2O with a hierarchical flower-like structure and an ultralarge layer spacing and evaluated its potential as a sodium-ion pseudocapacitive material. Ex situ X-ray diffraction (XRD) measurement and kinetic analysis demonstrate the reversible intercalation and deintercalation of Na+ in (NH4)2V10O25·8H2O in NaClO4 electrolytes. Significantly improved durability and a large voltage window of 3.2 V are achieved in the high-concentration NaClO4 electrolyte. Inductively coupled plasma-optical emission spectroscopy (ICP-OES) analysis and molecular dynamics (MD) simulations reveal that the dissolution of vanadium in the high-concentration NaClO4 electrolyte can be effectively suppressed. An asymmetric sodium-ion capacitor with a wide voltage window of 3.2 V was successfully assembled, and it delivered a high energy density of 53.1 Wh kg–1 at a power density of 3.2 kW kg–1.
研究领域:
材料科学
·
电化学储能
✓ 已验证
DOI
高影响因子
Energy Technology
·
2021
·Vol. 9
·期 7
·2001136
·
IF 3.631
Yang Gui,Pengcheng Li,Junsong Chen,Baoan Fan,Daniel John Blackwood
Recently, a multicomponent system in the electrochemical energy-storage field exhibits advantages of both electrochemical activity and electronic conductivity due to its synergistic effects. Herein, a trimetallic oxide thin film of Ni−Mn−Fe is obtained through a facile cyclic voltammetric electrodeposition method. The obtained thin film is grown vertically on Ni substrate to form a unique nanosheet morphology with shear-wall structure. This less crystalline structure is beneficial for the observed faster kinetics due to the rational transport channels, avoiding sluggish charge diffusion. This trioxide thin film displays a maximum capacitance of 3950 F g −1 at a current density of 1 A g −1 , with 1250 F g −1 being obtained at a higher current density of 25 A g −1 and maintaining a capacitance of 865 F g −1 after 10 000 cycles. In addition, by paring this film as a cathode with activated carbon, it delivers a considerable energy density of 194.2 Wh kg −1 at a power density of 0.75 kW kg −1 and still outputs an energy density of 33.2 Wh kg −1 at its highest power density of 19 kW kg −1 . When applied to a practical condition, the cell lights up three red light-emitting diodes (LEDs).
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
·
2020
·
IF 6.215
Man Zhang,Haihua Hu,Jiqiu Qi,Fuxiang Wei,Qingkun Meng,Yaojian Ren,Zhenzhen Zhan,Yanwei Sui,Zhi Sun
Copper sulfide as a typical example of transition metal sulfides is of great significance for practical application. Owing to maintain the structural stability of the converted reactive anode materials to alleviate their inherent poor conductivity and low specific capacitance have been considered as the most promising supercapacitors materials. The stoichiometric ratio and crystal structure of CuS are very sensitive, hence, it is extraordinarily imperative to regulate the morphology via controllable Ni ion functionalization for pseudocapacitors. Herein, the morphology of the prepared irregular mesh-like network CuS 2 @LSC (Longans shell carbon) composites transforms into micron flower-like Cu 7 S 4 @LSC by effective surface modification strategies. Furthermore, the LCC (Longans core carbon) was successfully prepared with compound granular alpha-Fe 2 O 3 as a negative material to assemble water-system Button Asymmetric Supercapacitors (BASC). Benefiting from the unique morphology design of the micron flower-like structure, the Cu 7 S 4 @LSC manifests exceptional remarkable storage performance. The maximum specific capacitance of 1431.1 F g − 1 at 1 A g − 1 , with energy density of 42.47 Wh kg −1 at the power density was 800 W kg −1 . Additionally, a single BASC lights up the LED and keeps it for 10 min. This demonstrates our study provides new strategy and insights of developing cost-effective, reliable and exceptional electrochemical performance asymmetric supercapacitor for auxiliary energy storage devices in a general sense.
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
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Yu Zhao,Shenggong He,Yuping Wu,Xiang Liu,Lingzhi Zhao,Yuzuo Ye,Shaofeng Wang,Xianhua Hou
Lithium dual-ion pseudo-capacitors (L-DICs) are attracting more and more attentions as electrochemical energy storage facilities, owing to high working plateaus, low cost, and environment friendly. In this work, three-dimensional (3D) urchin-like NiFe 2 O 4 with one-dimensional (1D) radially oriented nanorods is synthesized via hydrothermal method , which is used as anode material in L-DICs. The coordinated buffer space of the 3D microsphere and large length-to-diameter ratio of the 1D nanorods guarantee the capacitive-controlled Li storage and ensure the cycle stability of the electrode. By applying graphite as cathode, the L-DICs based on the urchin-like NiFe 2 O 4 as anode deliver a high reversible discharge capacity of ∼66 mAh g −1 at 1 A g −1 for over 350 cycles with 82.5% capacity retention.
研究领域:
材料科学
·
电化学能源存储
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Qingteng Lai,Yanke Zhang,Wei Chen,Zhengchun Liu
In this study, an ultrasensitive electrochemical-detection system based on a target “turn-on” signal-enhancement pseudocapacitor was established for microRNA-141 (miRNA-141) detection. A three-dimensional porous film was constructed on the electrode surface in situ by chitosan, catechol and nanomaterials (gold nanoparticles and nitrogen-doped carbon nanotubes). When miRNA-141 hybridized with the probe on the electrode, ferrocene (Fc) was specifically introduced into the electrode surface, and then a pseudocapacitor containing Fc, ruthenium ion (Ru 3+ ), catechol, and electrode formed (“turn on”). Fc and Ru 3+ consumed in the electrode reaction can quickly recover to the original valence state on the surface of catechol/quinone and again participated in the electrode reaction. A "one to many" relationship existed between the target and the signal molecule Fc, which contributed to the improvement of the sensor sensitivity. The signal strength and stability of Fc improved and thus improved the sensitivity and stability of miRNA-141 detection. The concentration information of miRNA-141 was collected from the change in Fc signal strength. The linear detection range was 0.5 fM to 800 pM, and the detection limit can be calculated as 43.73 aM. This system overcame the problems of low reliability and weak signal of the traditional electroactive-ion labeling method, which relied on the change in electrostatic attraction/repulsion before and after probe–target hybridization.
研究领域:
生物化学
·
纳米技术
·
电化学
·
生物传感器
·
癌症诊断
✓ 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）