APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Shuai Zhou,Xiang Zhou,Gazi Hao,Wei Jiang,Tianhe Wang
Modulation of the density (from 3.5 to 64 mg cm −3 ), hydrophobicity and oil-uptake capability of graphene aerogels in extensive ranges were achieved by reacting (3-Mercaptopropyl)trimethoxysilane (MPS) with graphene oxide solutions under heating. The reaction allowed a characteristic silicone substructure to be formed on graphene and joint the graphene layers firmly together. With the increase of MPS concentrations (≤ca. 0.2 vol%), the nano silicone polymer grown on graphene functioned as a “linker” and “spacer”, leading to a substantial decrease of the aerogel density. Because of the formation of silicone polymer and the characteristic nano-micro substructures on the backbones of graphene aerogels, the graphene aerogels exhibited a high hydrophobicity with the water contact angle consistently exceeding 142 degrees. Functionalized graphene aerogels with a density of 3.5 mg cm −3 were conveniently fabricated that displayed an extraordinary oil absorption capacity, 182 times for lubricating oil and 143 times for n-hexane of its own weight. Furthermore, the aerogels maintained their ultra-high absorption capability even after 20 absorption-distillation cycles, due to structural integrity held by the strong interfacial adhesion between graphene sheets and polymer chains of aerogels. This study offers a promising graphene aerogels and also provides a strategy for fabricating extra low dense functional materials.
研究领域:
材料科学
·
纳米科技
·
高分子化学
·
环境功能材料
·
表面与界面工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Gang Peng,Xiayin Yao,Hongli Wan,Bingxin Huang,Jingyun Yin,Fei Ding,Xiaoxiong Xu
An insightful study on the fundamental lithium storage behavior of all-solid-state lithium battery with a structure of LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA)/Li 10 GeP 2 S 12 /Li-In is carried out in this work. The relationship between electrochemical performances and particle size, surface impurities and defects of the NCA positive material is systematically investigated. It is found that a ball-milling technique can decrease the particle size and remove surface impurities of the NCA cathode while also give rise to surface defects which could be recovered by a post-annealing process. The results indicate that the interfacial resistance between the NCA and Li 10 GeP 2 S 12 is obviously decreased during the ball-milling followed by a post-annealing. Consequently, the discharge capacity of NCA in the NCA/Li 10 GeP 2 S 12 /Li-In solid-state battery is significantly enhanced, which exhibits a discharge capacity of 146 mAh g −1 at 25 °C.
研究领域:
材料科学
·
电化学
·
能源存储
·
固态离子学
·
电池技术
✓ 已验证
DOI
高影响因子
SOLID STATE IONICS
·
2017
·
IF 2.354
Leyu Zhan,Yao Zhang,Xiangyang Zhuang,Hui Fang,Yunfeng Zhu,Xinli Guo,Jian Chen,Zengmei Wang,Liquan Li
The x LiBH 4 -Li 3 N ( x = 1, 2, 4) composites were investigated on their lithium ionic conductivities . They maintained the original phase structures of orthorhombic LiBH 4 and hexagonal β-Li 3 N during ball milling according to the analyses by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). Electrochemical impedance spectra (EIS) tests showed that LiBH 4 -Li 3 N composites lift the lithium ionic conductivities from that of bulk LiBH 4 by nearly 100 times at low temperature. LiBH 4 -Li 3 N offers 1.06 × 10 − 5 S cm − 1 of conductivity while bulk LiBH 4 possesses only 2.05 × 10 − 7 S cm − 1 at 323 K. Cyclic voltammetry (CV) tests indicated that the voltage window of composites could attain 3 V, which is much more stable than Li 3 N (< 1 V). No thermodynamic incident appears in DSC curves except for the orthorhombic-hexagonal transition endothermic peak of LiBH 4 in the x LiBH 4 -Li 3 N composites. It confirms the phases stabilities of the x LiBH 4 -Li 3 N ( x = 1, 2, 4) composites before and after CV tests. In-situ solid state Nuclear Magnetic Resonance (NMR) tests on LiBH 4 -Li 3 N illustrated that the high conductivity in low temperature should not come from high-temperature phase of LiBH 4 . Therefore, the enhancement of lithium ionic mobility of the composite might be attributed to both Li 3 N and the interfaces between small crystallites where transmission electron microscope (TEM) morphology showed the appearance of amorphous grain boundary.
研究领域:
材料科学
·
固态离子学
·
能源化学
·
电化学
·
纳米材料
·
固体电解质
·
锂离子电池
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Dapeng Zhang,Zicheng Yao,Han Zhang,Guiru Zhu,Lu Liu,Congjie Gao
A novel strategy to fabricate thin film nanocomposite (TFN) membrane was reported by dispersing nanofillers in the aqueous and organic phase simultaneously via interfacial polymerization of m-phenylenediamine and trimesoyl chloride. Two different nanofillers (hydrophilic MCM-48 and hydrophobic ZIF-8) were used to investigate the new strategy. Both hydrophilic MCM-48 and hydrophobic ZIF-8 can effectively improve the separation performance of the TFN membrane with higher water flux value maintaining high salt rejection via the novel strategy than conventional TFN membrane prepared with same total amount nanoparticles in singly organic phase or aqueous phase. It indicates that the new strategy is feasible to obtain the TFN membrane with excellence separation performance compared with the conventional method by dispersing nanofillers in singly phase. The new strategy is realized by dispersing less amount nanofillers in both phases simultaneously, which is possible to avoid the aggregation of nanoparticles and maximize the effect of nanoparticles.
研究领域:
材料科学
·
膜分离技术
·
纳米复合材料
·
环境工程
·
化学工程
✓ 已验证
DOI
高影响因子
Small
·
2024
·Vol. 20
·期 26
·2310387
·
IF 13
Wei Luo,Yanli Yu,Yucheng Wu,Wenbin Wang,Yimin Jiang,Wei Shen,Rongxing He,Wei Su,Ming Li
Rational design of heterostructure catalysts through phase engineering strategy plays a critical role in heightening the electrocatalytic performance of catalysts. Herein, a novel amorphous/crystalline (a/c) heterostructure (a-CoS/Ni 3 S 2 ) is manufactured by a facile hydrothermal sulfurization method. Strikingly, the interface coupling between amorphous phase (a-CoS) and crystalline phase (Ni 3 S 2 ) in a-CoS/Ni 3 S 2 is much stronger than that between crystalline phase (c-CoS) and crystalline phase (Ni 3 S 2 ) in crystalline/crystalline (c/c) heterostructure (c-CoS/Ni 3 S 2 ) as control sample, which makes the meta-stable amorphous structure more stable. Meanwhile, a-CoS/Ni 3 S 2 has more S vacancies (S v ) than c-CoS/Ni 3 S 2 because of the presence of an amorphous phase. Eventually, for the oxygen evolution reaction (OER), the a-CoS/Ni 3 S 2 exhibits a significantly lower overpotential of 192 mV at 10 mA cm −2 compared to the c-CoS/Ni 3 S 2 (242 mV). An exceptionally low cell voltage of 1.51 V is required to achieve a current density of 50 mA cm −2 for overall water splitting in the assembled cell (a-CoS/Ni 3 S 2 || Pt/C). Theoretical calculations reveal that more charges transfer from a-CoS to Ni 3 S 2 in a-CoS/Ni 3 S 2 than in c-CoS/Ni 3 S 2 , which promotes the enhancement of OER activity. This work will bring into play a fabrication strategy of a/c catalysts and the understanding of the catalytic mechanism of a/c heterostructures.
研究领域:
材料科学
·
电化学
·
催化化学
·
纳米材料
·
能源材料
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Peilin Cao,Cong Wang,Linpeng Liu,Kaiwen Ding,Jiahua He,Dejin Yan,Nai Lin,Ji'an Duan
The reliability of Cu bonding technology in three-dimensional integration packaging is limited by high sintering temperatures and the growth of oxide at the joining interface. Hence, we propose a bionic adhesion interface of creeper sucker on the Cu substrate and covered with monolayer graphene, which increases the shear strength by 3 times compared to the conventional flat Cu substrate. The covered graphene layer effectively inhibits the generation of oxide at the joint interface and maintains a high shear strength after aging at 300 °C for 48 h Nanoscale Cu particles could reduce the chemical potential energy of the substrate surface , and stable bonding was achieved at 200 °C under a pressure of 2 MPa. Molecular dynamics simulation models reveal crystal structure evolution and residual stresses during the sintering process . This work demonstrates that bionic microstructures applied to copper bonding play an important role in interface enhancement, resulting in reliable bonding of Cu substrate at low temperatures. The method proposed here can provide insight into diversified applications including high-power light-emitting diodes soldering, SiC electronic devices, and flexible electrode interconnects.
研究领域:
材料科学
·
微电子封装
·
纳米技术
·
表面工程
·
固态物理
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2016
·Vol. 122
·期 5
·515
·
IF 1.444
Huang Liang,Zhu Pengli,Li Gang,Sun Rong
The partial reduced graphene oxide (P-rGO) sheets-wrapped nickel foams (NF@P-rGO) were prepared by hydrothermal method, and then their epoxy composites were fabricated via a simple drop-wetting process. The P-rGO sheets on the metal networks could effectively improve the compatibility between nickel foam and epoxy resin, thus greatly accelerate the wetting of epoxy resin on the foams and avoid cracks in the network–polymer interface. Owing to the existence of high-efficiency conductive metal networks, the NF@P-rGO/epoxy composite has a high thermal conductivity of 0.584 W m −1 K −1 , which is 2.6 times higher than that of neat epoxy resin. Additionally, owing to the improved wetting ability, NF@P-rGO-10 wt% boron nitride (BN) microsheets/epoxy composites could be fabricated and have a further higher thermal conductivity of 0.71 W m −1 K −1 . We believe the use of P-rGO as a novel surface modifier and the following liquid polymer drop-wetting could be an effective method to obtain novel and outstanding metal foam/polymer composites.
研究领域:
材料科学
·
高分子复合材料
·
热管理材料
·
表面与界面工程
✓ 已验证
DOI
高影响因子
CEMENT & CONCRETE COMPOSITES
·
2022
·
IF 9.93
Qiaomu Zheng,Chen Li,Facheng Song,Bei He,Wenting Li,Zhengwu Jiang
Secondary hydration is the main driving force of autogenous self-healing and directly impacts the closure of cracks in damaged cementitious materials . In fiber-reinforced cement composites , secondary hydration also dominates the regeneration of the fiber-matrix interface during the self-healing processes. As an important factor influencing the cement hydration , silica fume (SF) addition can be crucial to the self-healing performance of cementitious materials and composites. In this paper, the effect of SF on the autogenous self-healing of ultra-high-performance fiber-reinforced concrete was investigated. With a ≥20% SF addition, the secondary hydration the cement matrix adjacent to the cracks was accelerated. The dissolution of amorphous silica and the formation of Si-containing healing phases was observed. These effects predominated the closure of the mouth and the inner part of the cracks. SF addition also enhanced the regeneration of fiber-matrix interface by promoting the growth of self-healing products in these areas. The closure of cracks and the regeneration of fiber-matrix interface are both responsible for the restoration of flexural properties.
研究领域:
建筑材料
·
水泥基复合材料
·
土木工程材料
·
自修复材料
·
结构工程
✓ 已验证
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Jinhui Wang,Ruisong Wang,Xiaoxiao Ji,Chunde Jin,Yutao Yan
Phenol formaldehyde (PF) resin adhesives are widely used in the production of bamboo-based composites owing to their excellent bonding strength and durability. However, the inherent brittleness of cured PF resin may result in notable stress concentration at the interface between PF resin and bamboo bonding, leading to the generation of cracks. In this study, a hyperbranched compound polyethyleneimine (PEI) with high reaction activity was incorporated into a PF resin adhesive to toughen the adhesive and the bonding interface. And the effects of PEI incorporation on the properties of the adhesive and the bonding performance between PF resin and bamboo were comprehensively investigated. The results showed that introduction of flexible PEI chains could effectively facilitated stress transfer, avoiding stress concentration, thus enabling efficient energy release and play a toughening effect. In addition, PEI could react with PF resin and bamboo components during hot pressing, forming a three-dimensional network structure and enhancing the bonding interface, which was proved by FT-IR and XPS analysis. When 1 wt% PEI was incorporated, the bending strength and Charpy impact toughness of the modified PF resin was significantly increased by 38.88% and 76.02%, respectively, compared with the pure PF resin. While the dry and wet shear strength of the bamboo composite bonded by the PEI modified PF resin were also obviously increased. This study is expected to address the problem of cracking in the bonding interface of bamboo composite, and endow the composites with high strength and durability, which can prolong its service life and contribute to the healthy and sustainable development of the bamboo industry.
研究领域:
材料科学
·
木材科学与技术
·
高分子化学
·
复合材料工程
·
胶接与界面科学
✓ 已验证
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 41
·2302685
·
IF 13.3
Hancheng Ma,Xiang Huang,Luyu Li,Wei Peng,Sheng Lin,Yao Ding,Liqiang Mai
PtTe 2 , a member of the noble metal dichalcogenides (NMDs), has aroused great interest in exploring its behavior in the hydrogen evolution reaction (HER) due to the unique type-II topological semimetallic nature. In this work, a simple template-free hydrothermal method to obtain the phosphorus-doped (P-doped) PtTe 2 nanocages with abundant amorphous and crystalline interface (A/C-P-PtTe 2 ) is developed. Revealed by density functional theory calculations, the atomic Te vacancies can spontaneously form on the basal planes of PtTe 2 by the P doping, which results in the unsaturated Pt atoms exposed as the active sites in the amorphous layer for HER. Owing to the defective structure, the A/C-P-PtTe 2 catalysts have the fast Tafel step determined kinetics in HER, which contributes to an ultralow overpotential ( η = 28 mV at 10 mA cm −2 ) and a small Tafel slope of 37 mV dec −1 . More importantly, benefiting from the inner stable crystalline P-PtTe 2 nanosheets, limited decay of the performance is observed after chronopotentiometry test. This work reveals the important role of the inherent relationship between structure and activity in PtTe 2 for HER, which may bring another enlightenment for the design of efficient catalysts based on NMDs in the near future.
研究领域:
材料科学
·
电化学
·
纳米催化
·
能源材料
·
计算材料学
✓ 已验证
DOI
高影响因子
IONICS
·
2021
·Vol. 27
·期 8
·3339-3346
·
IF 2.817
Liu Huirong,Li Jianling,Feng Wei,Han Guimei
Commercial lithium-ion batteries have safety risks due to the use of electrolyte-containing flammable organic solvents. The development of all solid-state lithium ion batteries with solid electrolyte is a feasible technical way to improve the safety of batteries. In this work, PVDF-based composite solid-state electrolytes (CSEs) were prepared by coupling Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO) and polyvinylidene fluoride (PVDF). The electrochemical performance and interfacial compatibility between composite electrolyte and electrode were improved by the combination of appropriate amount of Li-ion-conducting particles and the insulating polymer. The corresponding solid-state battery of LiFePO 4 |PVDF-LLZTO-CSE| Li is fabricated and delivers initial discharge capacity of 162.4 mAh g -1 , and coulomb efficiency is approximately 98.5%. And the solid-state battery exhibits satisfactory rate capability and cycling stability at room temperature. This study suggests that a combination of the lithium garnet particles and insulating polymer is one of the promising methods to solve the problem of liquid electrolyte.
研究领域:
材料科学
·
电化学
·
能源存储
·
固态离子学
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Shaosuo Bing,Jiaqian Wang,Hao Xu,Yanyan Zhao,Yong Zhou,Lin Zhang,Congjie Gao,Li’an Hou
Polyamide (PA) thin-film composite (TFC) reverse osmosis membrane is widely used for desalination , but the selectivity-permeability trade-off and oxidation are two major restrictions on the membrane application. By modifying PA TFC membrane with potassium persulfate (K 2 S 2 O 8 ), we overcame the trade-off relation (the water flux and salt rejection increased by 43.2% and 0.2%, respectively) and improved the chlorine resistance. The modification was demonstrated to be a combination of the interfacial crosslinking between PA layer and polysulfone support with the surficial oxidation of PA layer. The dense crosslinked interface enabled the membrane with higher solute rejection, better chlorine tolerance and long-term stability. Meanwhile, the thinner PA layer contributed to the increase of membrane permeability. Furthermore, the modification method has the application potential in high-performance membrane fabrication in terms of simplicity and high efficiency.
研究领域:
材料科学
·
膜分离技术
·
高分子化学
·
环境工程
·
水处理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）