RSC Advances
·
2018
·Vol. 8
·期 44
·24900-24905
·
IF 2.936
Yanjie Wang,Chun Fang,Ying Huang,Qing Liu,Ruirui Zhao,Xuli Ding,Yunhui Huang
Organic compounds have been utilized in rechargeable batteries as electrode materials on account of their designable structures and reversible redox properties. However, most of them suffer from problems with dissolution resulting in poor electrochemical performance. In this work, we adapt a sodium salt of tetracyanoquinodimethane (NaTCNQ) to work as a high redox potential cathode material in sodium ion batteries (SIBs). A porous carbon coated separator is demonstrated to be an adsorption layer and prevents the dissolved active material from migrating to the anode side. The NaTCNQ cell assembled with a carbon layer containing 5% activated carbon (AC) exhibits a higher initial capacity and greatly improved cycling stability. Using a conductive adsorption layer in organic redox batteries is a promising pathway to develop high performance organic electrode materials for SIBs.
研究领域:
电化学
·
能源材料
·
纳米材料
·
电池技术
·
功能材料
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Chuankai Fu,Shuaifeng Lou,Yi Cao,Yulin Ma,Chunyu Du,Pengjian Zuo,Xinqun Cheng,Weiping Tang,Yongmin Wu,Yunzhi Gao,Hua Huo,Geping Yin
Recently, rechargeable lithium metal polymer battery (LMPB) attracts increasing attention because of its high safety and energy density properties. However, the high contact interfacial resistance of solid-state electrode and electrolyte is still an obstacle to satisfy the demand of high current density and long cycle stability, especially at room and lower temperature. Here, we develop a simple and efficient heat treatment method, to improve the interfacial compatibility between electrode and electrolyte in all-solid-state LMPB, successfully realizing workable LMPB at a reduced temperature (30 °C). The LMPB shows excellent cycling performance and rate capability in the voltage range of 2.5–4.2 V. The behavior of Li + plating/stripping on the surface of lithium metal anode is greatly enhanced. Meanwhile, the interfacial resistance of the LMPB decrease significantly after the heat treatment process .
研究领域:
材料科学
·
电化学
·
能源存储
·
固态电池
·
界面工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Xinming Du,Zhe Wang,Wenchang Liu,Jingmei Xu,Zhaoyu Chen,Chunmei Wang
A series of phenolphthalein-based poly (arylene ether ketone) (PEK) copolymer are synthesized to prepare anion exchange membranes (AEMs). The ion group 1-vinyl imidazole is introduced on the unit of phenolphthalein-based as a hydrophilic segment and cross-linking agent. The structure of resulting membranes was investigated by 1 H NMR and FT-IR. The well-defined microphase-separated structures were verified by TEM and SAXS profiles. The cross-linked membrane of ImPEK-0.4 exhibits high hydroxide conductivity (0.0836 S/cm, at 80 °C), excellent mechanical performance (69.6 MPa) and the maximum swelling ratio is only 7.95% at 80 °C. Furthermore, the excellent alkaline stability is demonstrated by immersing the prepared membrane in 1 M NaOH at 40 °C for 400 h. The ionic conductivity is still high to 0.0381 S/cm for ImPEK-0.4. These results indicate that combining phase separation architecture and crosslinking may possess potential applications for alkaline fuel cells (AFCs).
研究领域:
高分子材料科学
·
电化学能源材料
·
燃料电池技术
·
膜分离工程
·
聚合物化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 28
·期 17
·12747-12754
·
IF 2.019
Huang Feng,Yan Aihua,Sui Yanwei,Wei Fuxiang,Qi Jiqiu,Meng Qingkun,He Yezeng
Ni 3 S 4 @MoS 2 nanosheets grown on the carbon fiber paper (Ni 3 S 4 @MoS 2 /CFP) were successfully prepared via a facile one-step hydrothermal technique. Serving as a supercapacitor electrode, the obtaining Ni 3 S 4 @MoS 2 /CFP exhibits a remarkable specific capacitance of 1296 F/g, high rate capability of 57.8%, and excellent cycling stability of 96.2% retention after 5000 cycles. The superior electrochemical properties of Ni 3 S 4 @MoS 2 /CFP nanocomposite is attributed to the synergistic effects of the layeredNi 3 S 4 , MoS 2 and the conductive CFP.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
功能材料
·
复合材料
✓ 已验证
DOI
高影响因子
POWDER TECHNOLOGY
·
2018
·
IF 3.23
Zhilin Xi,Liwei Jin,J.Y. Richard Liew,Ding Li
A foam sol clay (FSC) mixture, mainly composed of fly ash (FA), surfactant ( n -amylamine) and polyethylene oxide (PEO), was proposed for coal dust control. The FA surface, modified by a FSC solution, stability and foamability were investigated. It was found that the FA surface in alkaline solution was deprotonated to form a negative charge, which could be adsorbed by the polar head group of n -amylamine via electrostatic interactions . As a result, with increasing surfactant, the particles gradually converted from hydrophilic to hydrophobic and attached at gas-liquid interfaces so that the contact angle, zeta potential , froth stability and foamability increased. At a surfactant concentration (c a ) of 35 g/L, a monolayer three-dimensional network was formed and the maximum foamability and half-life were obtained. Upon further increasing c a , a bilayer and particle clusters were formed by surfactant chain-chain interaction, resulting in particles becoming hydrophilic again, and the FSC solution having stronger mechanical resistance against flowing, so that the viscosity rapidly increased and the diffusion of free surfactant molecules was hindered at the froth surfaces. Thus, the contact angle, froth stability and foamability decreased. PEO could bond sodium dodecyl sulfate and water to form a dual adsorption layer and hydrogen, respectively, which enhanced the wettability of the FSC on coal dust surfaces. PEO could adsorb and curl FA particles to form a thin layer of armor after froth air-drying. It was concluded that the froth generated by the FSC solution, including 200 g/L FA, 35 g/L c a and 1 g/L PEO, could control coal dust with a long-term effect.
研究领域:
环境工程
·
矿物加工
·
胶体与界面化学
·
粉尘防治
·
资源利用
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Zhongxu Li,Shengzhao Zhang,Zhao Jiang,Dan Cai,Changdong Gu,Jiangping Tu
A novel cheap eutectogel (ETG) membrane based on the deep eutectic solvent (DES) immobilized poly (vinylidene fluoride-hexafluoro propylene) (PVDF-HFP) is proposed as a solid electrolyte for safe lithium metal batteries in this study. The composition of DES is optimized, which is prepared by mixing the N-methylacetamide (NMAC) and the lithium bis [(trifluoromethyl)sulfonyl]imid (LiTFSI) with a molar ratio of 4:1. The eutectogel is formed by incorporating 70 wt% DES into the PVDF-HFP, which is non-flammable and shows excellent mechanical properties. This ETG membrane electrolyte with a thickness about 25 μm possess a high ionic conductivity (3.05 × 10 −4 S cm −1 ) at room temperature and a wide electrochemical stability window (~5 V). The Li//ETG//LiFePO 4 full cells deliver an acceptable discharge capacity of ~133.9 mAh g −1 at 0.1C and room temperature after 100 charge-discharge cycles. The ETG membrane electrolyte can also endow the Li//ETG//LiFePO 4 pouch cell with flexibility and withstanding abuse operations, like nail penetration and cutting. We expect that the flexible and non-flammable eutectogel membrane will have implications for the use of DES based ionic liquids in the synthesis of advanced solid-state electrolytes for safer lithium batteries .
研究领域:
材料科学
·
电化学
·
能源存储
·
高分子物理
·
电池技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2013
·Vol. 1
·期 47
·14943-14950
·
IF 0
Hai Fu,Zhong-jie Du,Wei Zou,Hang-quan Li,Chen Zhang
A carbon nanotube reinforced polypyrrole nanowire network was constructed by in situ polymerization of pyrrole in the presence of carbon nanotubes using cetyltrimethylammonium bromide micelles as a soft template. Carbon nanotubes as a reinforcer were embedded into a network of polypyrrole nanowires, thus retaining in the latter a complete network. The resulting network possessed a specific surface area of 112.1 m2 g−1 and a rough porous structure. The embedding of carbon nanotubes decreased the charge transfer resistance in the polypyrrole nanowires and allowed easy access and rapid diffusion of ions/electrons. When applied as a capacitive electrode, a specific capacitance of 183.2 F g−1 was observed at a current density of 8 A g−1. The specific capacitance retention was 85% after 1000 cycles at 1 A g−1. An asymmetric supercapacitor was fabricated using the network as a positive electrode and active carbon as a negative electrode, and when operated at a maximum voltage of 1.5 V, had a high energy density (15.1 W h kg−1 at 3000 W kg−1). A long-term cycling test of the asymmetric supercapacitor at a current density of 1 A g−1 displayed a capacitance retention of 72% even after 3000 cycles of charge and discharge.
研究领域:
材料科学
·
纳米科技
·
电化学
·
能源存储
·
高分子科学
✓ 已验证
DOI
Energy & Environmental Materials
·
2020
·Vol. 3
·期 4
·529-534
·
IF 0
Yanyou Yin,Yu Zhang,Nannan Liu,Lishuang Fan,Naiqing Zhang
Transitional metal phosphides (TMPs) anode materials usually have large volume change and weak diffusion kinetics, leading to poor cycle stability. Combining TMPs with conductive carbon matrix has been widely used to boost sodium storage. However, it still needs to make efforts in the rational and facile design of nano/micro-structural TMPs/carbon hybrid anode material. Herein, a MOFs-derived strategy is developed to synthesize porous yolk–shell MoP/Cu 3 P@carbon microcages (MoP/Cu 3 P@C) through in situ and confined phosphidation reaction as a high-performance sodium-ion batteries anode. This yolk–shell structure can offer adequate internal space to buffer the large volume expansion, shorten diffusion distance, and create more active sites of Na + . Especially, the Cu nanoparticles generated from Cu 3 P have remarkable electronic conductivity of 5.7 × 10 7 S m −1 (the second most conductive metal) to benefit transporting electrons. And the introduction of Mo (MoP has high theoretical capacity of 633 mA h g −1 ) can enhance the reversible capacity of the whole anode material. Therefore, these porous yolk–shell MoP/Cu 3 P@carbon microcages possess excellent reversible capacity of 307.8 mA h g −1 at 1.0 A g −1 and extraordinary cycle stability of 132.1 mA h g −1 at 5.0 A g −1 even after 6000 cycles.
研究领域:
材料科学
·
电化学
·
纳米能源
·
储能技术
·
无机功能材料
✓ 已验证
DOI
Green Energy & Environment
·
2021
·Vol. 8
·期 2
·589-600
·
IF 8.207
Liuting Zhang,Farai Michael Nyahuma,Haoyu Zhang,Changshan Cheng,Jiaguang Zheng,Fuying Wu,Lixin Chen
Nb 2 O 5 nanoparticles with an average particle size of 10 nm supported on a rhombic dodecahedral metal organic framework (MOF) were successfully synthesized by a facile one-pot hydrothermal reaction and subsequent calcination process. Experimental results demonstrated that the prepared catalyst drastically improved the hydrogen storage behavior of MgH 2 . 7 wt% Nb 2 O 5 @MOF doped MgH 2 started to desorb hydrogen at 181.9 °C and 6.2 wt% hydrogen could be released within 2.6 min and 6.3 min at 275 °C and 250 °C, respectively. The fully dehydrogenated composite also displayed excellent hydrogenation by decreasing the onset absorption temperature to 25 °C and taking up 4.9 wt% and 6.5 wt% hydrogen within 6 min at 175 °C and 150 °C, respectively. Moreover, the corresponding activation energy was calculated to be 75.57 ± 4.16 kJ mol −1 for desorption reaction and 51.38 ± 1.09 kJ mol −1 for absorption reaction. After 20 cycles, 0.5 wt% hydrogen capacity was lost for the MgH 2 +7 wt% Nb 2 O 5 @MOF composite, much lower than 1.5 wt% of the MgH 2 +7 wt% Nb 2 O 5 composite. However, the addition of Nb 2 O 5 @MOF had limited effect on reducing the dehydrogenation enthalpy of MgH 2 . Microstructure analysis revealed that Nb 2 O 5 particles were uniformly distributed on surface of the MgH 2 matrix and synergistically improved the hydrogen storage property of MgH 2 with MOF.
研究领域:
材料科学
·
无机化学
·
纳米催化
·
能源存储
·
氢能源
·
固态储氢
✓ 已验证
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 64
·40462-40469
·
IF 3.108
Yingxia Wang,Zhong Xiong,Yanzhi Xia
In this work, novel branched palladium–gold (PdAu) bimetallic nanowires supported on graphene (PdAu/graphene) were fabricated at relatively low temperatures for the first time by a one-pot co-reduction method with the aid of poly(diallyldimethyl-ammonium chloride). The structural characteristics of PdAu/graphene were confirmed by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, high-angle annular dark-field scanning transmission electron microscopy and element mapping observations. The electrochemical properties of the PdAu/graphene were characterised by cyclic voltammetry and chronoamperometry (CA) in the formic acid oxidation reaction. Compared with a commercial Pd/C catalyst, the PdAu/graphene catalyst prepared in this work exhibited enhanced electrocatalytic activity including a higher oxidation current density, enhanced CO tolerance, and a more negative onset potential. Moreover, CA analyses demonstrated that PdAu/graphene shows higher stability than the Pd/C catalyst. The PdAu/graphene catalyst exhibited higher activity and strong poisoning resistance, which could be attributed to its special branched structure from PdAu nanowires.
研究领域:
纳米催化
·
电化学
·
材料科学
·
能源化学
·
表面科学
·
电分析化学
✓ 已验证
DOI
高影响因子
CARBON
·
2018
·
IF 7.082
Yiwen Hu,Yongxin Wang,Zhixiang Zeng,Haichao Zhao,Xuewu Ge,Kai Wang,Liping Wang,Qunji Xue
Dispersion of Graphene in water is conducive to their practical applications as lubricating additive in water-based fluids due to their safety, low cost and environmental-friendliness. But owing to its hydrophobicity , it is difficult to achieve stable aqueous graphene suspension. Here, we use the Toluene-2,4-diisocyanate as bridging agent between hydrophilic Poly (ethylene glycol) (PEG) and ethanolamine to prepare the amino-containing PEG (PEG-NH 2 ), followed by covalently grafting PEG-NH 2 onto the surface of carboxylaed graphene (G-COOH) nanosheets to synthesize the PEGlated graphene (PEG-G) via facile amidation under mild conditions. The physical, chemical properties of product were characterized by Fourier transformed infrared spectra (FTIR), Raman spectra , X-ray photo electron spectroscopy (XPS) and so on. Transmission electron microscopy (TEM) and scanning probe microscope (SPM) were utilized to observed the morphology of G-COOH and PEG-G. The frictional properties of PEG-G as nanoadditive of water-based lubricant were characterized by UMT-3 tribometer, following with analyzes on wear surfaces by 3D laser scanning confocal microscopy . Based on the results of characterization, the PEG-G was prepared successfully and the dispersion shows superior friction-reducing and anti-wear properties owing to the formation of fluid adhesive film and carbon protective film, especially the concentration of PEG-G in water is 0.05 wt%.
研究领域:
材料科学
·
纳米科技
·
表面工程
·
摩擦学
·
高分子化学
·
应用化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jingsheng Xu,Zhiyuan Wang,Runguo Zheng,Hongyu Sun,Yanguo Liu,Junhua You
Ni-rich cathodes especially with Ni content over 90 % are promising next-generation cathode materials for advanced high energy lithium − ion batteries. However, in comparison with Ni ≤ 80 % Ni-rich cathodes, these ultrahigh Ni-rich materials face more severe challenges in terms of harmful H2 − H3 phase transformations and structural degradation during cycling. Herein, we present a robust surface structure composted of defect-rich disordered structures and LiF/Li 2 SiO 3 coating for stabilizing the ultrahigh Ni-rich cathode LiNi 0.96 Co 0.03 Mn 0.01 O 2 (NCM96) by modification with (NH 4 ) 2 SiF 6 . The surface disordered structures including Li/TM mixing, spinel, and rock salt structure play a crucial role in inhibiting the irreversible H2-H3 phase transition and reducing lattice volume changes by lattice coherence effect. Moreover, the disordered surface in collaboration with the co-coating restrains the rapid growth of surface rock salt phase into the bulk, enhancing structural stability. The modified sample NSF-0.5 delivers a capacity of 238 mAh/g at 0.1C and maintains a capacity retention of 88.5 % at 0.5C after 100 cycles in half cell as well as 82.3 % at 1C after 300 cycles in full cell, significantly superior to the NCM96. The findings provide a simple and cost-effective surface modification strategy to enhance the structural stability and electrochemical performance of ultrahigh nickel cathodes for high-energy density LIBs.
研究领域:
材料科学
·
电化学
·
能源存储
·
锂离子电池
·
固态化学
·
表面工程
·
电池材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）