Energies
·
2023
·Vol. 16
·期 21
·7232
·
IF 3.2
Congxiu Guo,Guilin Li,Yujia Wu,Xuhui Wang,Yu Niu,Jiao Wu
Porous carbon materials derived from ZIF-8 have attracted extensive research attention on account of their large surface area, tunable mesoporosity and abundant nitrogen content. However, directly carbonized ZIF-8 usually suffers from a low electronic conductivity, poor wettability and relatively low mesoporosity, which severely restricts their capacitive performance. Herein, P-doped modified carbon materials derived from ZIF-8 (ZPCs) were synthesized by using nontoxic phytic acid as a phosphorus source, followed by carbonization at high temperature. Benefiting from its relatively high specific surface area of 911.7 m2g−1and higher ratio of mesopores, as well as N, O and P doping, ZPC-1000 delivers the largest specific capacity, up to 219.4 F g−1at 1 A g−1, among the prepared samples and an outstanding cycle span, retaining 100% capacity after 2000 cycles at 5 A g−1. In this work, we highlight the strategy of constructing a synergistic effect between high mesoporosity and heteroatom doping, which can greatly boost the capacitive performance of carbon materials.Keywords:P doping;ZIF-8;porous carbon;capacitive performance
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 SCIENCE
·
2019
·Vol. 54
·期 20
·13247-13254
·
IF 3.442
Liu Hao,Chen Bochao,Liao Libing,Fan Peng,Hai Yun,Wu Yuanyuan,Lv Guocheng,Mei Lefu,Hao Huiying,Xing Jie,Dong Jingjing
Metallic 1T MoS 2 greatly benefits the supercapacitance of MoS 2 due to its considerably higher conductivity as compared to semiconducting 2H MoS 2 . Alkali metals, such as Li, Na and K, are always used to prepare 1T MoS 2 through intercalation of alkali metal ions into the interlayer of 2H MoS 2 . Nevertheless, the influences of the alkali-earth metals as the guest in the interlayer of MoS 2 on its structure and electrochemical capacitor performance are rarely investigated. Herein, we introduced hydrated Mg ions as the guest into MoS 2 nanosheets. The interlayer spacing was increased to 1.144 nm after the introduction of hydrated Mg ions, larger than that of the pristine MoS 2 (0.620 nm) and restacking MoS 2 (0.626 nm). The enlarged interlayer spacing can accommodate more ions during intercalation process. Moreover, the 1T phase concentration after the introduction of hydrated Mg ions was as high as ~ 90%, which benefits the charge transfer during the charging/discharging processes. Consequently, the specific capacitance of the MoS 2 with Mg guest ions as well as the energy densities and power densities was greatly improved as compared to those of the restacking MoS 2 or pristine MoS 2 counterparts. The present work not only demonstrated a new strategy for engineering the physical properties and improving the electrochemical performance of MoS 2 supercapacitor electrode through pre-intercalation of alkali-earth metal ions in the interlayer of MoS 2 , but also has directive significance for the design of other layered electrode materials for energy storage systems.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Batteries-Basel
·
2023
·Vol. 9
·期 6
·304
·
IF 4
Ruixue Liu,Wenkang Liu,Jichao Chen,Xiangli Bian,Kaiqi Fan,Junhong Zhao,Xiaojing Zhang
Ionic conductive hydrogels with good conductivity and biocompatibility have become one of the research highlights in the field of wearable flexible sensors and supercapacitors. In this work, poly(methacrylic acid–methyl methacrylate)-reinforced poly(sodium acrylate–vinyl phosphonic acid) composite hydrogels (P(AAS-VPA)/PMMS) were designed and tested for strain sensor or supercapacitor applications. The results showed recoverability for 20 cycles of tension and compression experiments, an excellent breaking strain of 2079%, and ionic conductivity of 0.045 S·cm−1, demonstrating strong support for the application of the P(AAS-VPA)/PMMS hydrogel in strain sensors and supercapacitors. The composite hydrogel exhibited outstanding sensing and monitoring capability with high sensitivity (GF = 4.0). The supercapacitor based on the P(AAS-VPA)/PMMS composite hydrogel showed excellent capacitance performance (area capacitance 100.8 mF·cm−2and energy density 8.96 μWh·cm−2) at ambient temperature and even −30 °C (25.3 mF·cm−2and 2.25 μWh·cm−2). The hydrogel has stable electrochemical stability (1000 cycles, Coulomb efficiency > 97%) and exhibits electrochemical properties similar to those in the normal state under different deformations. The excellent results demonstrate the great potential of the P(AAS-VPA)/PMMS composite hydrogel in the field of strain sensors and flexible supercapacitors.Keywords:supercapacitors;latex particles;sensitivity;capacitance performance
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Zhengjiong Li,Haonan Peng,Rurong Liu,Yan Mo,Bokai Cao,Wende Lai,Xiran Li,Lisha Pan,Yong Chen
Activated carbon is widely used as electrode materials in supercapacitors , and its capacitive performance is significantly influenced by the specific surface area. However, different types of wall surfaces, such as basal-, edge- and defect-surfaces, exist in carbonaceous materials due to the complex structure and atomic distribution of carbon atoms, rendering different influences on capacitive charge storage behavior. Therefore, it is of utmost significance to quantitatively determine their contribution to the capacitive performance. Herein, the commercial graphite powder is ball milled to introduce different types of edges and defects, resulting in different proportions of basal-, edge- and defect-surfaces. Moreover, a modified non-local density functional theory calculations method is adopted to quantitatively evaluate the basal-, edge- and defect-surface area. Then, a relationship is established between the electrode capacitance and wall surface area by the linear regression method. The results reveal that the basal-, edge- and defect-surfaces contributed an areal capacitance of 0.04 μF cm −2 , 1.65 μF cm −2 and 7.95 μF cm −2 , respectively. Hence, the capacitance is mainly provided by the defects of wall surfaces.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 24
·13458-13464
·
IF 3.049
Hao Guo,Mingyue Wang,Rui Xue,Jing Yao,Xuejiao Wang,Longwen Zhang,Jianfeng Liu,Wu Yang
A new COF (NWNU-COF-4) linked by an aryl ether bond (Ar–O–Ar) was synthesized by the condensation reaction of 2,4,6-trihydroxypyrimidine and trinitrophenol under simple and easy reaction conditions. Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), N2 adsorption–desorption, thermogravimetric analysis (TGA), powder X-ray diffraction (XRD) and scanning electron microscopy (SEM) were utilized to characterize the product. The BET specific surface area of NWNU-COF-4 was 21.33 m2 g−1, and its pore size was about 1.351 nm. Additionally, this method of preparation was simple and cheap. The electrochemical measurements showed that the synthesized NWNU-COF-4 had excellent pseudocapacitive performance with maximum specific capacitance of 133.44 F g−1 at 0.3 A g−1 in 6 mol L−1 KOH electrolyte. When the current density increased by 10 times (3.0 A g−1), the specific capacitance was 114.12 F g−1, and the retention rate was 82%. After 10 000 GCD cycles, the capacitance still kept 94% of its initial capacitance.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 27
·10609-10617
·
IF 8.262
Dewei Liang,Shouliang Wu,Jun Liu,Zhenfei Tian,Changhao Liang
Morphology control and impurity doping are two widely applied strategies to improve the electrochemical performance of nanomaterials. Herein, we report an environmentally friendly approach to obtain Co-doped Ni(OH)2 nanosheet networks using a laser-induced cobalt colloid as a doping precursor followed by an aging treatment in a hybrid medium of nickel ions. The shape and specific surface area of the doped Ni(OH)2 can be successfully adjusted by changing the concentration of sodium thiosulfate. Furthermore, a Co-doped Ni(OH)2 nanosheet network was further converted into Co-doped NiO with its pristine morphology retained via facile thermal decomposition in air. The structure and electrochemical performance of the as-prepared samples are investigated with scanning and transmission electron microscopy, energy dispersive X-ray analysis, X-ray diffraction, Fourier transform infrared spectroscopy, the nitrogen adsorption–desorption isotherm technique, and electrochemical measurements. The Co-doped Ni(OH)2 electrode shows an ultrahigh specific capacitance of 1421 F g−1 at a current density of 6 A g−1, and a good retention level of 76% after 1000 cycles, in sharp contrast with only a 47% retention level of the pure Ni(OH)2 electrode at the same current density. In addition, the Co-doped NiO electrode exhibits a capacitance of 720 F g−1 at 6 A g−1 and 92% retention after 1000 cycles, which is also superior to the corresponding values of relevant pure NiO electrodes. The Co2+ partially substitutes for Ni2+ in the metal hydroxide and oxide, resulting in an increase of free holes in the valence band, and, therefore, enhancement of the p-type conductivity of Ni(OH)2 and NiO. Moreover, such novel mesoporous nanosheet network structures are also able to enlarge the electrode–electrolyte contact area and shorten the path length for ion transport. The synergetic effect of these two results is responsible for the observed ultrahigh pseudocapacitor performance.
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
·
2024
·
IF 5.8
Haihui Lin,Zilong Zhang,Kexin Wan,Zhenyuan Yang,Cuihong Zhang,Peng Zhang,Kemei Pei,Lei Dong,Zhenghai Chen,Fu-Gang Zhao
To hinder Van der Waals-induced agglomeration between graphene sheets to increase specific surface area, and to supplement pseudocapacitance, graphene processing with active molecules is highly effective. Redox polymers and quinones, instead of aromatic ethers, were popular candidates. They were universally blended with graphene sheets through noncovalent modes, leading to issues of electrochemical stability and rate capability, etc. Herein, we broke through stereotype to develop aromatic ethers–benzidine with two remote methoxyls (i.e. 3,3′–dimethoxybenzidine, DMeOBD)–to covalently functionalize graphene, obtaining the cross-linked and pillared graphene electrode material (DMeOBD-rGO). It exhibited redox activity and featured a combination of electrochemical double layer supercapacitor and pseudocapacitor, thus yielded an enhanced specific capacitance of 363 F g −1 . When assembled into two-electrode solid-state supercapacitors, the whole devices also delivered an impressive specific capacitance of 263 F g −1 , and a high energy density of 13.2 Wh kg −1 , along with excellent rate capability and cycling stability.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yingyi Ma,Kaizheng Xu,Xiaoting Liu,Shun Yao,Xinzheng Li,Yu Si,Xinran Li
3D architectures of conductive polymer, especially PEDOT hold great promise in energy storage and conversion fields. However, the facile construction of 3D PEDOT and its functionalization have still been challenges due to its poor processability. Herein, the fabrication of 3D porous PEDOT:PSS and its functionalization with MXene are realized synchronously through a simple and low-cost self-assembly process. The prominent capacitive performance of MXene, excellent chemical stability of PEDOT:PSS and 3D porous architecture with inhibited aggregation of MXene nanosheets, large amount of active sites, and electrolyte storage chamber endow the PEDOT/MXene-based porous structure with superior capacitive performance than individual PEDOT:PSS or MXene porous and flat structures. Furthermore, the PEDOT/MXene-based porous structure can be applied as a flexible scaffold for the deposition of conductive polymer to construct excellent electrodes for supercapacitors (SCs). When polypyrrole (PPy) is deposited, the prepared porous PEDOT:PSS/MXene/PPy electrode exhibits a high gravimetric specific capacitance of 345 F g −1 at a current density of 0.5 A g −1 and a remarkable capacitance retention of 89 % over 5000 cycles. Based on it, an asymmetric supercapacitor (ASC) with a high energy density of 56.34 Wh kg −1 at the power density of 120 W kg −1 , and a capacitance retention of 75 % after 5000 cycles is developed. Besides, the porous PEDOT:PSS/MXene/PPy can be constructed on various substrates in any pattern with high design freedom, thus enabling customizable electrochemical performance. When constructing on a flexible substrate, excellent deformation-tolerant performance is shown. This work provides a high-performance electrode for SCs, as well as a universal route for the construction and functionalization of 3D PEDOT-based structures.
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
Science China-Chemistry
·
2011
·Vol. 55
·期 3
·352-358
·
IF 0
Liu Wei,Sun MingLiang,Wang Wei,Song LingXia,Ge HongLun,Sun Miao,Zhang QingJie
Polyfluorene (PF) film has been successfully electropolymerized at lower potential (0.91 V vs. Ag/AgCl) in the mixed electrolyte of boron trifluoride diethyl etherate and trifluoroacetic acid. The PF film is characterized to have about 10 repeat units and no presence of ketonic defect site. UV-vis and photoluminescent spectral studies indicate that the PF film is blue light emitting. From cyclic voltammetry and galvanostatic charge-discharge tests in 1 M lithium perchlorate/acetonitrile electrolyte, the polyfluorene/activated carbon electrode shows a specific capacitance of 227.1 F g −1 (per active layer mass) and reversible redox reaction at the potential of 1.4 V in a three electrode configuration. An asymmetric electrochemical capacitor based on this composite electrode and activated carbon electrode exhibits a specific energy of 14.7 Wh kg −1 (per active layer mass). These results indicate that electrochemically prepared polyfluorene could be used as energy storage component for electrochemical application.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 16
·15130-15138
·
IF 2.195
Liu Wanying,Zhu Yabo,Wang Shasha,Ban Xiaokuan,Xu Xiang,Zhang Xinxi
The composite of polypyrrole and black phosphorus (PPy/BP) has been successfully prepared by the in situ chemical method through the polymerization of pyrrole (Py) on the surface of BP flake. Characterization results show that it present well-dispersed morphological and P–C bonding in PPy/BP. It is evident that the adding of BP exactly brings the changes in morphological and structure. To verify the existence of BP and to obtain the structure relationship between BP and PPy, an auxiliary experiment has been designed and the corresponding XRD and TEM results clearly display that BP is wrapped by PPy. All these morphology and structural characteristics are conductive to the excellent electrochemical performance of PPy/BP. The electrochemical results show that, the capacity of PPy/BP is 515 F/g at 1 A/g, which is ~ 1.7 times (70%) higher than that of PPy and ~ 7.1 times than that of BP. The capacity of PPy/BP reaches stable value within 200 circles, which is faster than that of PPy within 450 circles. The stable value of PPy/BP is still ~ 1.5 times (48%) higher than that of PPy within 1000 circles, presenting better cycling performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Wenhan Jia,Hao Wu,Yunxin Zheng,Ziyi Liu,Gaotuo Cai,Jianfeng Wen,Guanghui Hu,Tao Tang,Xinyu Li,Li Jiang,Zhiyong Wang,Ming Li,Haifu Huang
Herein, we demonstrate the enhanced pseudocapacitive performance of a MoS2-based flexible supercapacitor by the co-doping strategy of cations and anions. The MoS2 nanosheet arrays on carbon cloth are directly doped with N and Co atoms through a simple hydrothermal process. The obtained cation and anion co-modified MoS2 (N-Co-MoS2) shows improved electron transport efficiency and enhanced active sites for MoS2. According to the first-principles calculations, N-Co-MoS2 has a unique band structure and high electrical conductivity. As expected, N-Co-MoS2 shows higher capacitive performance with 5072.5 mF cm–2 and a better cycle life (retaining 100% capacitance after 10,000 cycles) than pure MoS2. Furthermore, a solid-state flexible N-Co-MoS2 supercapacitor device is fabricated to demonstrate excellent mechanical stability with a specific capacitance of 3236 mF cm–2 and a stable cycle capacitance of 75.56% after 5000 cycles. In our work, we have provided a reference for preparing MoS2-based materials with good supercapacitive 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
Micro & Nano Letters
·
2019
·Vol. 14
·期 5
·493-495
·
IF 0.975
Qinghua Yang,Chunni Xiao,Bingbing Chen,Lin Ma,Limei Xu
MoS 2 hierarchical nanoflowers are fabricated through a gelatin-assisted hydrothermal route. The obtained MoS 2 products are characterised by X-ray powder diffraction, scanning electronic microscopy, transmission electronic microscopy and X-ray photoelectron spectra. It is indicated that MoS 2 nanoflowers (MoS 2 NFs) are assembled by nanosheets as building blocks and gelatin plays a crucial role in the formation of these novel structures. Moreover, MoS 2 NF electrode exhibits an enhanced capacitive property because of its unique microstructure.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）