ChemNanoMat
·
2025
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IF 2.6
Kui Cao,Xun Yang,Fanen Zeng,Zhen Tan,Qi Lv,Yaning Zhang,Qinyi Yang,Bing Xu
Carbon nanospheres (CNSs) are synthesized through the direct hydrothermal method by using the polyelectrolyte polydiallyldimethylammonium chloride (PDDA) as a cationic surfactant and high concentration glucose as a carbon source. The produced samples are systematically characterized by scanning electron microscope, transmission electron microscope, X-ray photoelectron spectroscopy, zeta potential analysis, X-ray diffraction, and Brunner–Emmet–Teller measurements. The obtained CNSs are well dispersed with particle size ranging from 70 to 100 nm. Their specific surface area increases remarkably to 1597 m 2 g −1 after activated by potassium hydroxide, together with the formation of hierarchical micropores and mesoporous structures (an average pore size of ≈3 nm). The possible reaction mechanism of the CNSs is deduced on the basis of the above characterizations, and the size of the CNSs can be regulated by the PDDA with different molecular weight. The CNSs material exhibits a specific capacitance of 121.1 F g −1 when used as a supercapacitor electrode at a current density of 0.5 A g −1 . Remarkably, the CNSs electrode shows excellent rate capability and outstanding cycling stability with almost no degradation over 7,000 cycles. These data reflect their excellent electrochemical performance for supercapacitor.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 19
·9598-9607
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IF 6.97
Shiyu Zhang,Zhendong Yang,Ke Gong,Ben Xu,Hao Mei,Haobing Zhang,Jiaxin Zhang,Zixi Kang,Youguo Yan,Daofeng Sun
Conformal hydrolysis of MOF precursors is a promising strategy to prepare hierarchical metal hydroxide electrode materials on a large scale with low cost and high efficiency. However, a complete transformation is challenging due to the normal “outside-in” conversion process. After studying the hydrolysis of Ni-MOF-74, which has regular 1D channels, we suggest that the transformation to Ni(OH)2 can occur simultaneously outside and within the precursor depending on the treatment temperature. Molecular dynamics simulations reveal that a higher temperature weakens the steric effects of OH− ions and facilitates the diffusion in the regular channels, and therefore, a complete transformation from Ni-MOF-74 to Ni(OH)2 is achieved. It is for the first time demonstrated that the 1D channels of MOFs are utilized for the complete conformal hydrolysis of Ni-MOF-74 to Ni(OH)2 electrode materials. Meanwhile, we also perform pioneering work illustrating that the complete conformal hydrolysis is the key to the improved supercapacitor performances of the MOF-derived Ni(OH)2 electrodes. The prepared Ni(OH)2 electrode under the optimized conditions has a specific capacity of 713.2 C g−1 at a current density of 1 A g−1, which is at least 28% larger than those of the Ni(OH)2 prepared at other temperatures. The detailed analyses based on CV and EIS of the obtained Ni(OH)2 electrodes indicate that the residual MOFs within electrodes due to incomplete hydrolysis significantly influence the diffusion length and diffusion efficiency of OH−, drastically lowering the supercapacitor performances.
研究领域:
材料科学
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电化学
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计算模拟
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2018
·Vol. 165
·期 11
·A2415
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IF 3.662
Lei Liu,Xinyu Fu,Guoxu Wang,Kehan Liang,Lili Zhang,Wei Wang,Aibing Chen
Carbon monolith is of particularly great interest in electrochemical applications due to its high surface area, controllable morphology and excellent electronic conductivity. Herein, a novel three-dimensional hierarchically porous carbon monolith (TD-HPCM) was synthesized by a "pyrolysis-capture" strategy. The commercial polyurethane (PU) foam concurrently acted as a template and carbon precursor. Carbonaceous organic gas pyrolyzed from PU foam was captured by mesoporous silica which coated on the branches of PU foam uniformly then converted into carbon under catalysis of Ni species at high temperature. The geometric shape and interconnected network of PU foam were preserved in TD-HPCM, with a large specific surface area (1111 m2 g−1) and uniform mesoporous size (6.7 nm). The TD-HPCM was explored as binder-free electrode in supercapacitors, with capacitance up to 162 F g−1 at 1.0 A g−1 in 6 M KOH electrolyte and favorable capacitance retention (92.7% capacitive retention after 5000 cycles). This strategy provides a controllable, energy efficient and highly repeatable method to prepare TD-HPCM with micro/meso/macroporous structures as binder-free electrodes in electrical double layer capacitors.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yuye Dou,Xiangyi Zhang,Guobo Chen,Xiaohui Jiang,Xia Li,Liangmin Yu
Herein, we introduce a novel and controllable self-template approach for fabricating hierarchical porous carbon microspheres with cavities (CPCMs). This approach uses polyacrylonitrile (PAN) and acrylamide (AM) microspheres as templates, which feature small anisotropic bumps on their surface. These bumps are encapsulated by divinylbenzene (DVB) during the coating polymerization process. The subsequent hydrolysis of PAN and AM led to the formation of a hierarchical porous structure. Specifically, mesopores mainly arose from PAN hydrolysis, whereas AM contributed additional micropores and macropores, generating an intricate pore structure within the DVB shell. This method differs from traditional pore-making approaches. Additionally, in situ doping of nitrogen (N) and oxygen (O) atoms was achieved. The amount of DVB coating can be adjusted to vary the shell thickness, allowing for the modulation of the pore size distribution and surface micromorphology. Owing to the synergistic effects of an ultrahigh specific surface area (1151.9 m 2 g −1 ), extensive pore volume (1.2575 m 3 g −1 ), and well-structured micro-meso-macropore hierarchy, along with N/O codoping, the resulting carbon material exhibited outstanding electrochemical energy storage performance. Notably, the optimal CPCMs-2 electrode achieves an exceptional specific capacitance of 377 F g −1 at a current density of 0.5 A g −1 . This study proposes a novel avenue for designing hierarchical porous carbon materials, and CPCMs could be expanded to a wide range of applications.
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
Nanomaterials
·
2024
·Vol. 14
·期 7
·573
·
IF 4.4
Zhou Wang,Yijie Lian,Xinde Zhu,Qi Wang
The application of transition metal hydroxides has long been plagued by its poor conductivity and stability as well as severe aggregation tendency. In this paper, a novel hierarchical core–shell architecture, using an F-doped Co(OH)2nanorod array (Co(OH)F) as the core and Mn/Ni co-doped Co(OH)2nanosheets (NiCoMn-LDH) as the shell, was constructed via an MOF-mediated in situ generation method. The obtained Co(OH)F@ NiCoMn-LDH composites exhibited excellent supercapacitive performance with large specific capacitance as well as improved rate capability and long-term stability. The effect of the Ni/Mn ratio on the supercapacitive performance and energy storage kinetics was systematically investigated and the related mechanism was revealed.
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
PubMed
高影响因子
National Science Review
·
2024
·Vol. 11
·期 8
·
IF 16.3
Li Haoran,Wu Zhitan,Liu Xiaochen,Lu Haotian,Zhang Weichao,Li Fangbing,Yu Hongyuan,Yu Jinyang,Zhang Boya,Xiong Zhenxin,Tao Ying,Yang Quan-Hong
Thickening of electrodes is crucial for maximizing the proportion of active components and thus improving the energy density of practical energy storage cells. Nevertheless, trade-offs between electrode thickness and electrochemical performance persist because of the considerably increased ion transport resistance of thick electrodes. Herein, we propose accelerating ion transport through thick and dense electrodes by establishing an immobile polyanionic backbone within the electrode pores; and as a proof of concept, gel polyacrylic electrolytes as such a backbone are in situ synthesized for supercapacitors. During charge and discharge, protons rapidly hop among RCOO− sites for oriented transport, fundamentally reducing the effects of electrode tortuosity and polarization resulting from concentration gradients. Consequently, nearly constant ion transport resistance per unit thickness is achieved, even in the case of a 900-μm-thick dense electrode, leading to unprecedented areal capacitances of 14.85 F cm−2 at 1 mA cm−2 and 4.26 F cm−2 at 100 mA cm−2. This study provides an efficient method for accelerating ion transport through thick and dense electrodes, indicating a significant solution for achieving high energy density in energy storage devices, including but not limited to supercapacitors.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Limin Wang,Zhenxiang Chen,Yongchun Liu,Rajkumar Devasenathipathy,Dan Li,Dujuan Huang,Qiulan Huang,Liujie Lu,Ziyi Huang,Du-Hong Chen,Youjun Fan,Wei Chen
The practically low energy density limits the large-scale application of graphene in supercapacitors. Here, we propose a space-confined method for the preparation of fluorine-modified graphene (FG) by using fluorine-containing groups (PF 6 – or BF 4 – ) as co-intercalated ions and reactants. The semi-ionic C–F bonds in FG contribute a brilliant capacitive performance in both acidic and alkaline electrolytes. Particularly, in alkaline medium, the FG electrode exhibited an ultrahigh specific capacitance (1210 F g −1 ), surpassing 2 orders of the theoretical capacitance value of graphene. Meanwhile, the FG-assembled symmetrical supercapacitor device (FG-SSD) possesses ultrahigh energy density (418.7 Wh kg −1 ) and power density (2 kW kg −1 ) in acidic medium, highlighting the practical application of supercapacitors. Theoretical calculations revealed an increased electrochemical double layer capacitance and amplified the electrochemical window of FG-SSD. This work demonstrates a spatially confined method for the preparation of functional graphene and its spectacular potential for supercapacitor-related electronics.
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
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2018
·
IF 3.235
Qingfeng Zhou,Yun Gong,Jianhua Lin
NiV 2 O 6 /C composites are prepared via a solid-state conversion process by low temperature (150 °C) annealing nickel‑vanadium-based coordination polymer , [Ni(phen)H 2 O][V 2 O 6 ]. The obtained NiV 2 O 6 /C nanoribbons are interconnected to form a sponge-like morphology, when the composites are first used as supercapacitor electrode, it exhibits a specific capacitance of 745.6 F g −1 at 0.5 A g −1 with a good rate capability of 520.0 F g −1 (69.7% retention) at 10 A g −1 (20-folds). The NiV 2 O 6 /C composite exhibits good cycling performance, the capacitance retentions at 6000th and 12000th charging/discharging cycles at 2 A g −1 are 81.5% and 77.8% relative to the original capacitances, respectively. The morphological and compositional changes of the NiV 2 O 6 /C composite electrode before and after 12,000 GCD cycles (two-electrode system) are carefully elaborated through a series of characterization (SEM, EDS , and XPS). Furthermore, the NiV 2 O 6 /C nanoribbons possess reversible electrochromism , which is probably related to the intervalence charge transfer (IVCT, V IV → V V ).
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 ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Jia Yan,Sichao Wang,Yuan Chen,Ming Yuan,Yunpeng Huang,Jiabiao Lian,Jingxia Qiu,Jian Bao,Meng Xie,Hui Xu,Huaming Li,Yan Zhao
NiS/MoS 2 composite nanosheets were designed and prepared via facile ion-exchange, freeze-drying, and Ostwald ripening processes. MoS 2 nanosheets served as backbones to absorb Ni 2+ ions and form NiS nanosheets. The electrode based on the NiS/MoS 2 composite nanosheets exhibited an ultrahigh specific capacity of 343.5 mA h g −1 at 9 A g −1 , which was superior to that of as-prepared MoS 2 nanosheets (125.8 mA h g −1 ) and Ni(OH) 2 nanosheets (148.9 mA h g −1 ). In addition, NiS/MoS 2 composite nanosheets presented an enhanced rate performance and good life cycle due to their hierarchical structure, high surface area with numerous active sites, and synergistic performance. A NiS/MoS 2 //AC asymmetric supercapacitor device operated in a large potential window (0–1.5 V) delivered a high capacitance of 48.4 F g −1 at 0.1 A g −1 , an excellent energy density of 15.1 Wh kg −1 and a very high power density of 2.25 kW kg −1 . This smart in situ construction process opens a new route to synthesize binary metal sulfides for high-performance energy storage devices.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Antai Zhu,Jun Huang,Haibo Xie,Wang Yue,Shangdong Qin,Fazhi Zhang,Qinqin Xu
The facile preparation of sustainable polymer gel electrolyte by using renewable natural polymers has attracted much attention, and the development of new polymer gel electrolyte materials largely depends on the facile design and preparation of a polymer network capable of effectively loading external high-performance electrolyte. In this study, taking the advantages of a newly developed solvent system superbase/DMSO/CO 2 for cellulose, a new and facile “all-in-one” strategy to engineer cellulose into flexible cellulosic poly (protic ionic liquids)/PVA-based composite organic ionogel electrolyte (CPOIE) has been developed through in situ derivatization, chemical cross-linking and compositing strategy using succinic anhydrides, epichlorohydrin, and polyvinyl alcohol, respectively. The findings show that CPOIEs exhibit both excellent mechanical properties and superior electrochemical properties (high ionic conductivity up to 4.2 mS/cm at room temperature with a wide electrochemical window of 2.0 V for C 1 P 1 OIE sample). A supercapacitor assembled by using the as-prepared C 1 P 1 OIE sample delivers a good specific capacitance of 122 F/g at 0.5 A/g, a high energy density up to 17.38 Wh/Kg at room temperature and an excellent cyclic stability up to 8000 cycles.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ChemElectroChem
·
2021
·Vol. 8
·期 21
·4083-4090
·
IF 4.59
Mengmeng Zheng,Qibin Chen,Jianqing Bian,Honglai Liu
Graphical A single-phase quaternary M 2 (OH) 3 Cl based composite is prepared, derived from a deep eutectic solvent annealing process, followed by exposure to air at ambient temperature. The quaternary M 2 (OH) 3 Cl composite exhibits an excellent supercapacitive performance, exceeding unary, binary, and ternary metal hydroxychlorides. This strategy offers new possibilities for improving the capacitive performance of metal hydroxychlorides. Metal hydroxychloride, as a new electrode material, shows an excellent electrochemical performance owing to the presence of abundant Cl − ions and hydroxyl groups. Herein, a single-phase quaternary M 2 (OH) 3 Cl based composite is constructed, for the first time, via a simple deep eutectic solvent annealing process, followed by the exposure to air at ambient temperature. Herein, this composite, denoted as M 2 (OH) 3 Cl-4/CoNi/N−C, is made up of ultrafine M 2 (OH) 3 Cl nanoparticles composed of Mn 2+ , Fe 2+ , Co 2+ and Ni 2+ , CoNi alloy nanoparticles and N-doped carbon with a degree of graphitization. M 2 (OH) 3 Cl-4/CoNi/N−C exhibits an excellent specific capacitance of 1576.6 F g −1 at 0.5 A g −1 , exceeding the unary, binary and ternary metal hydroxychlorides, which is attributed to the synergistic effect among the four metals in M 2 (OH) 3 Cl and the formation of CoNi alloy nanoparticles and carbon substrates. Our findings offer promise for creating unique functional materials via combining multiple components with distinctive properties.
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 Materiomics
·
2024
·
IF 8.4
Wei Chen,Ying Wei,Xiuling Dong,Zhong-Xia Wang,Zheng Xing,Qingguo Zhang,Xiang Liu
Ionic gel (IG) electrolytes are emerging as promising components for the development of next-generation supercapacitors (SCs), offering benefits in terms of safety, cost-effectiveness, and flexibility. The ionic conductivity, stability, and mechanical properties of the gel electrolyte are relevant factors to be considered and the key to improving the performance of the SC. However, the structure–activity relationship between the internal structure of IGs and their SC properties is not fully understood. In the current study, the intuitive and regular structure–activity relationship between the structure and properties of IGs was revealed via combining computational simulation and experiment. In terms of conductivity, the ionic liquid (IL) ([EMIM][TFSI]) in the IG has a high self-diffusion coefficient calculated by molecular dynamics simulation (MDS), which is conductive to transfer and then improves the conductivity. The radial distribution function of the MDS shows that the larger the g ( r ) between the particles in the polymer network, the stronger the interaction. For stability, IGs based on [EMIM][TFSI] and [EOMIM][TFSI] ILs have higher density functional theory calculated binding energy, which is reflected in the excellent thermal stability and excellent capacitor cycle stability. Based on the internal pore size distribution and stress-strain characterization of the gel network ([ME3MePy][TFSI] and [BMIM][TFSI] as additives), the highly crosslinked aggregate network significantly reduces the internal mesoporous distribution and plays a leading role in improving the mechanical properties of the network. By using this strategy, it will be possible to design the ideal structure of the IG and achieve excellent performance.
研究领域:
材料科学
·
物理化学
✓ 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）