CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Zhanjian Liu,Huaiyuan Wang,Xiguang Zhang,Chijia Wang,Chongjiang Lv,Yanji Zhu
In this work, a novel bistratal gas layer structure has been used to enhance the long-term durability of a superhydrophobic surface. The design of this bistratal structure takes inspiration from the wings of the insect Notonecta glauca and a spider web. It is comprised of an underlying semi-interpenetrating array structure and a superficial microfiber network structure. On modification with 1 H ,1 H ,2 H ,2 H -perfluorooctyltriethoxysilane (POTS), the prepared surface demonstrates an excellent superhydrophobicity with a water contact angle (WCA) of 168 ± 1.4° and a sliding angle (SA) of 4 ± 0.5°. The underlying semi-interpenetrating array structure can capture more gas to form a stable underlying gas layer, which enhances its anti-static pressure capability. When the superhydrophobic surface was impacted by a high-pressure water column (250 kPa), the superficial micro fibers network structure acted as a buffer layer to disperse the impact force that spread over the network. The prepared surface with bistratal gas layer structure was thus able to high speed water jetting (22.4 m s −1 ), which is three times the speed of the heavy rain (7–9 m s −1 ) and four times that reported for polysiloxane/multiwalled carbon nanotubes (POS/MWCNTs) surfaces (5.4 m s −1 ). Furthermore, the superhydrophobic surface designed by this method was also shown to possess self-healing and hot-water-repellent (100 °C) capability. These features demonstrate the practical potential of superhydrophobic surfaces with a bistratal gas layer structure.
研究领域:
材料科学
·
表面工程
·
纳米技术
·
仿生学
·
物理化学
✓ 已验证
DOI
高影响因子
MATERIALS & DESIGN
·
2016
·
IF 3.997
XinRong Liu,Ming Zhang,TingTing Yang,LiNa Wang,Han Zhu,ShunLi Wang,MingLiang Du
Carbon nanofibers served as nanoreactors for the design and construction of PtCo alloy carbon core-shell nanostructures with nitrogen doping (PtCo/NCNF) through a combination of electrospinning and nitrogen doping treatments. The PtCo/NCNF hybrid consists of PtCo alloy nanoparticles surrounded by a few of N-doped carbon layers , demonstrating a typical core-shell structures. The PtCo/NCNF hybrid can both served as electrode materials for electrocatalytic water splitting including hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). For the HER performance, the PtCo/NCNF exhibits very small onset potential of 20 mV, an overpotential of 50 mV at a j (vs RHE) = 10 mA cm − 2 and Tafel slope of 30 mV dec − 1 . The PtCo/NCNF hybrid also exhibits high OER activity with an onset potential of 310 mV, an overpotential of 400 mV at a j of 10 mA cm − 2 and a small Tafel slope of 76 mV dec − 1 . The high catalytic activities of PtCo alloy for HER and OER originate from the 3D hierarchical structures, well-dispersed PtCo alloy, high conductivity of NCNF, protection from the carbon-encapsulated structure, and the introduction of nitrogen.
研究领域:
材料科学
·
纳米技术
·
电化学
·
能源化学
·
催化化学
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Zhenhua Wang,Jing Zhang,Yuxiang Yang,Xinyang Yue,Xiaoming Hao,Wang Sun,David Rooney,Kening Sun
Traditionally polyvinylidene fluoride membranes have been used in applications such as membrane distillation , wastewater treatment , desalination and separator fabrication. Within this work we demonstrate that a novel carbon nanofiber/polyvinylidene fluoride (CNF/PVDF) composite membrane can be used as an interlayer for Lithium Sulfur (Li S) batteries yielding both high capacity and long cycling life. This PVDF membrane is shown to effectively separate dissolved lithium polysulfide with the high electronic conductivity CNF not only reducing the internal resistance in the sulfur cathode but also helping immobilize the polysulfide through its abundant nanospaces. The resulting Li S battery assembled with the CNF/PVDF composite membrane effectively solves the polysulfide permeation problem and exhibits excellent electrochemical performance. It is further shown that the CNF/PVDF electrode has an excellent cycling stability and retains a capacity of 768.6 mAh g −1 with a coulombic efficiency above 99% over 200 cycles at 0.5C, which is more than twice that of a cell without CNF/PVDF (374 mAh g −1 ). In addition, the low-cost raw materials and the simple preparation process of CNF/PVDF composite membrane is also amenable for industrial production.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米复合材料
·
电池技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 86
·45930-45938
·
IF 3.708
Mengmeng Zhang,Hongxia Yan,Xiaowei Yang,Chao Liu
In this paper, graphene oxide (GO) was functionalized with a hyperbranched cyclotriphosphazene polymer, which was synthesized by the repeated reactions of hexachlorotriphosphazene with hexamethylenediamine. Subsequently, the resultant functionalized GO was incorporated into dicyclopentadiene bisphenol dicyanate ester (DCPDCE) to prepare composites. Fourier-transform infrared spectra, X-ray photoelectron spectroscopy, X-ray diffraction and transmission electron spectroscopy were employed to examine the surface functionalization of GO. The effects of functionalized GO on the curing reactivity, mechanical, dielectric, thermal and water resistent properties of DCPDCE resin were investigated systematically. Results show that the addition of modified GO can facilitate the curing reaction of DCPDCE. Meanwhile, the appropriate content of modified GO can enhance the mechanical properties including impact and flexural strengths of DCPDCE resin. When modified GO content is 0.6 wt%, the corresponding composite exhibits slightly higher dielectric constant but lower dielectric loss than pure DCPDCE resin over the testing frequency from 10 to 60 MHz. In addition, the thermal stability and moisture resistance of modified GO/DCPDCE nanocomposties are also superior to that of pure DCPDCE resin.
研究领域:
高分子化学
·
复合材料科学
·
材料物理与化学
·
纳米材料
·
绝缘材料
✓ 已验证
DOI
高影响因子
Small
·
2021
·Vol. 18
·期 8
·2105599
·
IF 13.281
Wuhong Xue,Qitao Jiang,Fakun Wang,Ri He,Ruixue Pang,Huali Yang,Peng Wang,Ruilong Yang,Zhicheng Zhong,Tianyou Zhai,Xiaohong Xu
2D ferroelectrics with robust polar order in the atomic-scale thickness at room temperature are needed to miniaturize ferroelectric devices and tackle challenges imposed by traditional ferroelectrics. These materials usually have polar point group structure regarding as a prerequisite of ferroelectricity. Yet, to introduce polar structure into otherwise nonpolar 2D materials for producing ferroelectricity remains a challenge. Here, by combining first-principles calculations and experimental studies, it is reported that the native Ga vacancy-defects located in the asymmetrical sites in cubic defective semiconductor α‑Ga 2 Se 3 can induce polar structure. Meanwhile, the induced polarization can be switched in a moderate energy barrier. The switched polarization is observed in 2D α‑Ga 2 Se 3 nanoflakes of ≈4 nm with a high switching temperature up to 450 K. Such polarization switching could arise from the displacement of Ga vacancy between neighboring asymmetrical sites by applying an electric field. This work removes the point group limit for ferroelectricity, expanding the range of 2D ferroelectrics into the native defective semiconductors.
研究领域:
材料科学
·
凝聚态物理
·
纳米电子学
·
功能材料
·
半导体物理
✓ 已验证
DOI
高影响因子
Advanced Electronic Materials
·
2023
·Vol. 9
·期 11
·2300392
·
IF 6.2
Guangliang Li,Lingxian Kong,Qi Su,Xianhua Tan,Xuning Zhang,Zhiyong Liu,Tielin Shi,Guanglan Liao,Bo Sun
Few-layer black phosphorus (FL-BP) shows great potential in infrared polarization-sensitive photodetection due to its narrow bandgap and strong in-plane anisotropy. However, FL-BP is easy to be oxidized and degraded, which severely restricts its applications. Herein, a simple and scalable in situ interfacial passivation method based on pentacene film is reported to enhance the ambient stability of FL-BP as well as achieve n-type doping for improved polarization-sensitive photoimaging. High crystal quality FL-BP flakes with intrinsic anisotropy are prepared by electrochemical exfoliation. The morphology and Raman spectra of FL-BP/pentacene exhibit excellent stability 28 days after passivation. In addition, the hole mobility is significantly enhanced and dark current is substantially suppressed due to the interfacial passivation and n-type doping effect. The FL-BP/Pentacene based photodetector shows a broadband response from visible to near-infrared with good stability. The photoresponsivity under 915 nm illumination is calculated as 2.2 mA W −1 with an anisotropy ratio of 1.29. Furthermore, the polarization imaging under the irradiation at zigzag and armchair directions directly reveals the strong infrared polarization-sensitive imaging capability of FL-BP/pentacene. This work also opens up new avenues to enhance the photoresponse and stability of various optoelectronics based on similarly unstable 2D materials.
研究领域:
纳米材料学
·
光电子学
·
二维材料
·
半导体物理
·
红外成像
·
表面科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Dong Zhang,Xuanxuan Ma,Qi Zhang,Yanru Xie,Qiang Shi,Qiangru Wang,Wenjun Wang
Zn x Al 2 O 4 :Cr 3+ (0.8 ≤ x ≤ 4) phosphors with spinel structure were prepared by using sol-gel method. The structure, morphology and photoluminescence properties were analyzed by using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron paramagnetic resonance (EPR) and photoluminescence (PL). The spinel structure of ZnAl 2 O 4 was formed for all samples, and hexagonal structure of ZnO appeared in the powders with x ≥ 1.1. The results of XRD, SEM and TEM showed that the crystallinity of Zn x Al 2 O 4 :Cr 3+ phosphors was improved with increasing the value of x . The PL spectra showed a series of sharp emission peaks ranging from 650 nm to 730 nm assigned to spin-forbidden 2 E g → 4 A 2 g transition of Cr 3+ ions in spinel lattices. The most intense emission was observed in Zn 1.2 Al 2 O 4 :Cr 3+ powders, and the results of EPR showed that this enhancement resulted from the best dispersity of Cr 3+ ions in Zn x Al 2 O 4 lattices.
研究领域:
材料科学
·
无机化学
·
固体物理
·
发光材料
·
纳米材料
✓ 已验证
DOI
高影响因子
Small
·
2023
·Vol. 20
·期 9
·2306758
·
IF 13.3
Chen Li,Ke Liu,Dequan Jiang,Huacai Yan,En Chen,Yingying Ma,Haoming Cheng,Ting Wen,Binbin Yue,Yonggang Wang
Polymorphic phase transition is an essential phenomenon in condensed matter that the physical properties of materials may undergo significant changes due to the structural transformation. Phase transition has thus become an important means and dimension for regulating material properties. Herein, this study demonstrates the pressure-induced multi-transition of both structure and physical properties in violet phosphorus, a novel phosphorus allotrope. Under compression, violet phosphorus undergoes sequential polymorphic phase transitions. Concomitant with the first phase transition, violet phosphorus exhibits emergent insulator–metal transition, superconductivity, and dramatic switching from positive to negative photoconductivity. Remarkably, the resistance of violet phosphorus shows a sudden drop of around 10 7 along with the phase transition. In addition, piezochromism from translucent red to opaque black and suppression of photoluminescence are observed upon compression. Of particular interest is that the sample irreversibly transforms into black phosphorus with a pronounced discrepancy in physical properties from the pristine violet phosphorus after decompression. The abundant polymorphic transitions and property changes in violet phosphorus have significant implications for designing novel pressure-responsive electronic/optoelectronic devices and exploring concealed polymorphic transition materials.
研究领域:
凝聚态物理
·
材料科学
·
高压物理
·
半导体物理
·
光学材料
·
相变动力学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Baifeng Wu,Xiaofeng Wang,Xuefeng Xia,Qixin Wan,Yangsheng Li,Fan Li
The power conversion efficiency (PCE) of the perovskite solar cell (PSC) has made an illustrious breakthrough in the past ten years. However, it is still a great challenge to fabricate high-quality perovskite films due to the intrinsic high defect-density and internal non-radiative recombination, which has severely hindered the development of PSCs . Herein, a new-type additive guanidinium tetrafluoroborate (GuaBF 4 ) is introduced to improve the perovskite films quality, thus boosting photovoltaic performance of resultant PSCs . It is demonstrated that owing to the synergistic effect of Gua + and BF 4 − , the introduction of GuaBF 4 can improve the quality of CH 3 NH 3 PbI 3 (MAPbI 3 ) films. Through optimizing the concentration of GuaBF 4 , the MAPbI 3 film with GuaBF 4 displays higher crystallinity , enlarged crystal grain and smoother surface. Furthermore, by virtue of the strong interaction between MAPbI 3 and GuaBF 4 , the inclusion of GuaBF 4 can effectively passivate traps/defects in perovskite films, thereby diminishing the non-radiative recombination and promoting the charge carrier transportation. Consequently, a high-performance MAPbI 3 PSC with a PCE of 20.62 %, lessened hysteresis behavior and improved moisture stability is achieved. Our research emphasizes on the significance of the synergistic effect in additives for high-performance PSCs.
研究领域:
材料科学
·
能源科学
·
半导体器件
·
表面化学
·
光电子学
✓ 已验证
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Xingyan Liu,Tianrong Xiong,Yonggang Xu,Kunhe Yang,Youzhou He,Haifeng Yang,Hong Wu,Jiajia Jing,Siqi Li,Siping Wei
Defect engineering for MOFs is a promising approach to accelerate the charge transfer to further enhance the photocatalytic performance. Up to now, the current defect engineering strategy for MOFs mainly focuses on a single adjustment mode with the apparent ceiling effect, whether the further break out of the ceiling effect could be achieved through the combination of two or more adjustment modes is still in its infancy. In this work, the original NH 2 -MIL-125 was firstly adjusted by a single adjustment mode in ethanol solvothermal method to obtain partially linker defective NM-125-X (where X signifies the distinct temperatures used in the solvothermal treatment, with optimal results observed at X = 120). Subsequently, the NM-125-120 was further re-regulated by adjusting the ligand defects through another adjustment mode in water heating agitation, resulting in the ultimate defective NM-125-120-65. The NM-125-120-65 obtained through double defect engineering avenue showed superior photocatalytic performance with the hydrogen production rate of 11585.23 μmol·g −1 , which was 1.23 and 14.05 times as those of partially defective NM-125-120 (9427.65 μmol·g −1 ) and original NH 2 -MIL-125 (824.85 μmol·g −1 ), respectively. In addition, the NO removal rate of NM-125-120-65 was 64.8 % also higher than that of NM-125-120 (37.8 %) and NH 2 -MIL-125 (23.6 %). Through a series of comparative experiments, especially TGA and XPS, it was noted that the ligand defective NH 2 -MIL-125 can be formed by ethanol solvothermal method, and it was also confirmed that through further re-regulating the ligand defects in water heating agitation, the linker defects could also be further expanded. The PL emission spectra, IT diagrams, and EIS measurements displayed that the NM-125-120-65 had outstanding conductivity and excellent electron mobility compared to NM-125-120 and NH 2 -MIL-125. This work provided a novel approach for the subsequent defect engineering by another adjustment mode based on the existing defective MOFs via double linker defect engineering adjustment modes, so as to further obtain better photocatalytic performance for solving the environmental and energy crisis.
研究领域:
材料科学
·
环境化学
·
能源化学
·
光催化
·
纳米材料
·
物理化学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2019
·
IF 15.548
Xiaodong Li,Sheng Fu,Shiyu Liu,Yulei Wu,Wenxiao Zhang,Weijie Song,Junfeng Fang
Operational stability remains the foremost concern delaying the commercialization of perovskite solar cells (PSCs). Ions diffusion from iodine-rich perovskite layer to metal electrode is one main reason for the irreversible devices degradation. Here we introduce chemically crosslinked TMTA (trimethylolpropane triacrylate) at both bulk perovskite layer and perovskite/PCBM interface to suppress the ions diffusion toward electrode. The TMTA in perovskite layer suppresses ions migration along grain boundaries and TMTA at perovskite/PCBM interface blocks ions diffusion toward electrode, owing to its continuous network structure and chemically inert nature. Diffusion experiment, permeation experiment and resistive random-access memory (RRAM) investigation confirm the effectively blocked ions diffusion in PSCs with TMTA whether under heat, light or electric field conditions. The resulting PSCs exhibit 7-fold improvement in operational stability at elevated temperature of 60 °C, retaining ~80% of initial efficiency after maximum power point tracking for 1000 h under continuous illumination. The PSCs with TMTA also exhibit good thermal stability and retain over 90% of the initial efficiency after aging at 60 °C for 1000 h.
研究领域:
材料科学
·
光伏技术
·
纳米材料
·
能源化学
·
器件物理
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Shaopei Jia,Yanhui Wang,Pengfei Tian,Shuyu Zhou,Haixia Cai,Hongwei Gao,Jianbing Zang
Nitrogen-doped mesoporous carbon (NMC) was synthesized via pyrolysis of cobalt-containing casein obtained by extraction from pure milk with the auxiliary of cobalt ions. The cobalt element in casein promoted specific surface area and N element doping amount of casein-derived porous carbon. The N-doped porous carbon obtained by carbonization at 800 °C (NPC-800) possessed a specific surface area of ∼886.7 m 2 g −1 , and the mesoporous size was centered at 2.7 and 7 nm. X-ray photoelectron spectroscopy analysis showed that the nitrogen content of NPC-800 was 3.29 at%. The NPC-800 was explored as a symmetric supercapacitor, which exhibited specific capacity of 380 F g −1 at a current density of 0.5 A g −1 , 218 F g −1 at a current density of 20 A g −1 , and high capacitance retention of 91.3% after charging/discharging 5,000 cycles.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
功能材料
·
碳材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）