Chem
·
2020
·
IF 19.735
Fenglei Shi,Wenpei Gao,Hao Shan,Fan Li,Yalin Xiong,Jiaheng Peng,Qian Xiang,Wenlong Chen,Peng Tao,Chengyi Song,Wen Shang,Tao Deng,Hong Zhu,Hui Zhang,Deren Yang,Xiaoqing Pan,Jianbo Wu
Summary Corrosion of nanoparticles during electrocatalysis, such as oxygen reduction reaction (ORR), occurs at the nanoscale and is vital for catalyst stability. Here, using liquid cell (LC) transmission electron microscopy (TEM), we study the corrosion process of palladium@platinum (Pd@Pt) core-shell octahedra in real time and reveal that both the static local strain and the evolving curvature synergistically control the nanoscale corrosion kinetics. Specifically, in locations with tensile strain and high local curvature, the etching process is much faster. Density functional theory (DFT) calculation suggests that the dissolution potential of the Pd nanocrystal decreases as the strain increases; meanwhile, Pd atoms tend to be corroded more easily on a surface under tensile strain than on one under compressive strain. With these insights on the corrosion mechanism at the nanoscale, we subsequently designed and synthesized nanoparticles with smaller strain, and these showed higher durability in both an in situ LC study and an ex situ ORR stability test.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
Matter
·
2024
·
IF 17.3
Xuechun Sun,Pengju Shi,Jiahui Shen,Jichuang Shen,Liuwen Tian,Jiazhe Xu,Qingqing Liu,Yuan Tian,Donger Jin,Xiaohe Miao,Jingjing Xue,Rui Wang
Compressive strain is often considered as a key factor in stabilizing formamidinium (FA)-based perovskites. However, the compression along which direction stabilizes perovskite remains unclear due to the presence of non-uniform strain within the material. Here, we introduce a metal encapsulation method to apply compressive strain along the in-plane or out-of-plane direction of perovskite film. According to the grazing-incidence wide-angle X-ray scattering (GIWAXS) results, in-plane compression enhances the stability of perovskites, whereas out-of-plane compression has a detrimental effect. Specifically, out-of-plane compression can lead to the formation of an inactive δ-phase, which compromises the stability of the perovskite. Finally, we develop a general process to integrate in-plane compression into perovskite solar cell (PSC) devices, thereby improving their stability. Our study clarifies the mechanism by which compressive strain affects perovskite stability, offering valuable guidance for strain engineering to optimize perovskite performance.
研究领域:
材料科学
·
光伏技术
✓ 已验证
DOI
高影响因子
Physica Status Solidi-Rapid Research Letters
·
2024
·Vol. 18
·期 4
·2300346
·
IF 2.5
Dingbang Yang,Xiao Guo,Junjie Jiang,Yongsong Wang,Yuedong Wang,Jindong Bai,Haipeng Xie,Jin Li,Fangping Ouyang,Han Huang
Interfacial interactions, including interfacial charge transfer and strain, play important roles in the applications of 2D layered materials. Recently, MoO 2 have been widely used as precursors or substrates for growth of high-quality MoS 2 . Herein, photoluminescence (PL) and Raman spectroscopy are used to investigate the dependence of epitaxial monolayer MoS 2 PL properties on MoO 2 nanoflakes in different thicknesses on c-sapphire. On all MoO 2 nanoflakes, the trion exciton of MoS 2 disappears due to the interfacial charge transfer from MoS 2 to MoO 2 . The neutral exciton of MoS 2 exhibits a ≈60 meV redshift on thick MoO 2 nanoflakes compared to those either on c-sapphire or on thin MoO 2 nanoflakes, which is attributed to the relaxation of c-sapphire-induced compressive strain in MoO 2 over a critical thickness. Temperature-dependent PL measurements reveal a stronger electron–phonon interaction in MoS 2 on MoO 2 than on c-sapphire. The findings provide an easy way to tune the properties of MoS 2 via tuning the thickness of MoO 2 buffer layer on c-sapphire.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2018
·Vol. 29
·期 17
·175502
·
IF 3.404
Hui Pan,Zhixin Chen,Shenmin Zhu,Chun Jiang,Di Zhang
Nanoparticles, having the ability to self-assemble into an ordered structure in their suspensions, analogous to liquid crystals, have attracted extensive attention. Herein, we report a new type of colloidal gel with an ordered crystal structure assembled from 1D and 2D nanoparticles. The material has high elasticity and, more interestingly, it shows significant photoelasticity. Its refractive index can be tuned under external stress and exhibits an ultra-wide dynamic range (Δn) of the order of 10−2. Due to the large Δn, the material shows an extremely high strain sensibility of 720 nm/ε, an order of magnitude higher than the reported ones.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
·
2020
·
IF 2.69
Ruixue Liu,Yingbo Li,Jichao Chen,Xiaojing Zhang,Zhibin Niu,Yadong Sun
Chitosan adhesive hydrogels have attracted interest because of their unique properties. However, it is still a challenge to use simple and unmodified chitosan to synthesize multifunctional hydrogels with adhesive, self-healing and strain sensing properties. Here, a multifunctional hydrogel of Ca2+-chitosan/polyacrylamide（Ca2+- CS/PAAm）with adhesive self-healing and strain sensing properties was carried out by one-step preparation method. The hydrogel has the ability to adhere to a variety of materials, wherein the adhesion strength to rubber surface is 48.4 kPa. The hydrogel has excellent strain sensing capability on finger bending or cyclic stretching, the sensitivity factor is 0.41 ± 0.015. The cut hydrogel healed completely at room temperature within 4 h, and the healing hydrogel can be stretched to 5 times of its original length. This makes Ca2+-CS/PAAm hydrogel to be great potential in the application of strain sensors, wound dressing and skin adhesives.
研究领域:
生物材料
·
医学工程
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Applied Materials Today
·
2019
·
IF 8.013
Lei Tong,Xiaoyan Duan,Luyao Song,Tiande Liu,Lei Ye,Xinyu Huang,Peng Wang,Yuanhui Sun,Xin He,Lijun Zhang,Ke Xu,Weida Hu,Jian-Bin Xu,Jianfeng Zang,Gary J. Cheng
Intrinsic linear polarized optics discovered in anisotropic two-dimensional (2D) materials has attracted intense interest for polarization-sensitive optical and optoelectronic applications , such as black phosphorous, ReSe 2 , etc. However, the lack of matured method to synthesize high-quality, large-scale and air-stable 2D materials with anisotropic properties, is still an obstacle for practical applications. Monolayer molybdenum disulfide (MoS 2 ), which exhibits strong direct-band-gap light-harvesting properties, can be grown maturely. But unfortunately, MoS 2 does not show linear dichroism owing to its in-plane isotropic crystalline symmetry. We, herein, for the first time, report on an artificial control of extrinsic linear polarized photoelectric effect in monolayer MoS 2 , by successfully controlling its anisotropic degree of in-plane crystal symmetry via artificially induced uniaxial tensile strain . Strong linear polarization-sensitive photodetection from visible to near-infrared range is realized for monolayer MoS 2 -based device, and the polarization anisotropic ratio can reach up over 2.0 under 4.5% strain. The observation is supported by combination of experiment-theory study on polarized Raman spectrum and optical absorption under gradually applied strains. Our results have demonstrated that the artificial-controlled symmetry reducing of MoS 2 is a promising strategy to achieve high performance polarization photodetection. This method can also be extended to other 2D materials, which potentially opens up a new field to endow isotropic 2D materials with anisotropic functionalities by artificial structure engineering.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Lisong Hu,Yitong Xie,Shishuai Gao,Xiaoyu Shi,Chenhuan Lai,Daihui Zhang,Chuanwei Lu,Yi Liu,Lei Du,Xuezhi Fang,Feng Xu,Chunpeng Wang,Fuxiang Chu
Stretchable and tough polysaccharide-based functional hydrogels have gained popularity for various applications. However, it still remains a great challenge to simultaneously own satisfactory stretchability and toughness, particularly when incorporating renewable xylan to offer sustainability. Herein, we describe a novel stretchable and tough xylan-based conductive hydrogel utilizing the natural feature of rosin derivative. The effect of different compositions on the mechanical properties and the physicochemical properties of corresponding xylan-based hydrogels were systematically investigated. Owing to the multiple non-covalent interactions among different components to dissipate energies and the strain-induced orientation of rosin derivative during the stretching, the highest tensile strength , strain, and toughness of xylan-based hydrogels could reach 0.34 MPa, 2098.4 %, and 3.79 ± 0.95 MJ/m 3 , respectively. Furthermore, by incorporating MXene as the conductive fillers, the strength and toughness of hydrogels were further enhanced to 0.51 MPa and 5.95 ± 1.19 MJ/m 3 . Finally, the synthesized xylan-based hydrogels were able to serve as a reliable and sensitive strain sensor to monitor the movements of human beings. This study provides new insights to develop stretchable and tough conductive xylan-based hydrogel, especially utilizing the natural feature of bio-based resources.
研究领域:
材料科学
·
生物工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Xiaoyu Shi,Kai Wang,Shishuai Gao,Daihui Zhang,Chenhuan Lai,Can Jin,Mi Li,Chunpeng Wang,Qiang Yong,Fuxiang Chu
As lignin is one of the most abundant renewable resources, utilization to fabricate functional hydrogels has gained increasing attention. However, the heterogeneous structure and the few available functional groups of lignin limited its applications. Herein, we presented a simple strategy to synthesize gallic acid (GA)-modified lignin as a key component to prepare conductive hydrogels. The addition of GA during the organic solvent pretreatment of poplar changed the structure of lignin and increased the total content of phenolic hydroxyl groups from 3.20 to 3.89 mmol/g (EOL-G30). Moreover, the enzymatic hydrolysis of pretreated poplar was enhanced from 49.1 to 55.2% (OP-G30) at a low enzyme loading of 5 FPU/g. When using GA-modified lignin to prepare hydrogels, the resulting hydrogel exhibited excellent self-adhesion to various substrates and demonstrated effective free radical scavenging capabilities. When incorporating sodium chloride (NaCl) as conductive ions, the hydrogels exhibit reliable strain-sensing capability. Moreover, they also displayed robust functionality in a low-temperature environment (−20 °C). This study has presented valuable insights to realize in situ modification of lignin and fabricate lignin-based functional materials, offering new perspectives for the biorefinery industry.
研究领域:
材料科学
·
生物化学
·
可再生资源工程
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2022
·
IF 20.831
Tong Zhou,Xinrun Yu,Fan Li,Jianwei Zhang,Bowen Liu,Longlong Wang,Yuan Yang,Zhiwei Hu,Jun Ma,Chao Li,Guanglei Cui
Nickel-rich layered transition metal oxide is limited by the poor structural stability during cycling as cathode materials for next-generation lithium-based automotive batteries . In the past, the poor electrochemical performance was mainly attributed to cracks and formation of rock-salt phase on the particle surface at high potentials. Rarely is the effect of bulk phase structure evolution on properties discussed. Here, we report a bulk oxygen release induced dynamic accumulative electrochemical–mechanical coupling failure mechanism. Domain-like rock salt phases are generated due to the oxygen release and transition metals migration in the bulk region of LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM622) particles at the first cycle high cutoff voltage. Then, reversible compressive/tensile lattice strain alternately dominate around the domain boundary and accumulate with cycling, leading to capacity fading and becoming the origin of intracrystalline cracks. The results suggest that, in addition to the side effects from the surface, the structural transformation of the bulk plays an important role in the capacity fading. The stabilization of lattice oxygen in bulk region is a feasible solution to suppress the structural transition and the inhomogeneous stress distribution.
研究领域:
材料科学
·
电化学
·
储能技术
·
锂离子电池
·
固态物理
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 12
·4235-4242
·
IF 6.4
Linping Wang,Ben-Lin Hu,Fengyuan Zhang,Yinxia Zhang,Junming Li,Tianhua Xu,Run-Wei Li
Electrodes are essential components in electronic devices. One challenge in developing wearable electronics involves obtaining elastic electrodes with high mechanical and electrical stability. Poor mechanical and electrical stability in stretchable polymer electrodes often stems from instability of the nodes in the polymer network based on poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), which has typically been used in elastic electrodes. In this study, soft and long chains were covalently crosslinked to the PSS chains directly via esterification between sulfonic acid and epoxy groups, and is used as the first effective example of the direct covalent-crosslinking of PEDOT:PSS to enhance the mechanical and electrical stability of elastic electrodes. By varying the crosslinking temperature and long chain ratio, the optimal PEDOT:PSS films showed a conductivity of 13 100 S m−1 and a stretchability of up to 50%. The R/R0 values of these films up to 50% strain were lower than 1.5. Elastic capacitive strain sensors using these crosslinked PEDOT:PSS films as electrodes showed a high linearity of up to 50% strain and excellent stability during cyclic testing. Our study provides a valid solution for enhancing the mechanical and electrical stability of elastic electrodes, indicating the potential of stable elastic PEDOT:PSS electrodes in thin film devices for electronic skin applications.
研究领域:
材料科学
·
电子工程
·
可穿戴技术
✓ 已验证
DOI
高影响因子
Cell Reports Physical Science
·
2022
·
IF 7.832
Jigang Du,Yang Zhang,Xubing Wu,Wei Li,Bingxue Jiang,Song Wang,Khak Ho Lim,Qingyue Wang,Pei Zhao,Wen-Jun Wang,Pingwei Liu
Embedding the capability of self-sensing to polymeric materials provides tremendous opportunities for developing smart materials with highly important applications. However, a facile method that can introduce this capability to different polymers beyond strain sensing remains elusive. Here, we report a strategy of incorporating a continuous graphene sheet as an electric probe into polymer matrices for developing self-sensing composites. The resulted composite demonstrates impressively high conductivities of 290 S/m at a graphene volume fraction ( V G ) of 0.00068, a good electrical recovery at a cyclic elastic strain of 30% and a strain-sensing upper limit of 80%. Moreover, the glass transition, melting, and photodegradation process of different polymers can also be monitored in situ , and the corresponding glass transition temperature ( T g ) and melting point ( T m ) can be calculated. Our work paves the way for the development and application of novel self-sensing polymer composites with high sensitivity and versatility based on two-dimensional (2D) materials.
研究领域:
材料科学
·
智能材料
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xiaokun Zhu,Xin Gu,Jiamei Han,Jiabin Jiang,Zimeng Pan,Jiachen Wang,Zihao Chen,Xiang Liu
Facile-prepared films with a high-temperature coefficient of resistivity ( TCR ) are crucial for application in high-sensitivity bolometers. In this study, La 0.7 Ca 0.25 K 0.05 MnO 3 (LCKMO) films were grown on (001)-oriented La 0.3 Sr 0.7 Al 0.65 Ta 0.35 O 3 (LSAT) substrates using the spin-coating method. Various sintering temperatures (900 °C ≤ T s ≤ 1050 °C) were utilized in the film preparation, causing the lattice mismatch between films and substrate degraded. The effect of T s on the strain state of films was investigated through X-ray diffraction (XRD) analysis. The distortion of MnO 6 octahedra and the Mn–O bond were assessed using Raman and FTIR spectra, respectively. The structural perfection and elemental valence of films were adjusted via optimizing T s . Meanwhile, the strain state and defect structure were effectively improved with T s increasing. These results indicate that the LCKMO films with high crystalline quality can be achieved by optimizing the sintering process. The TCR of LCKMO films was modified. When T s at 1000 °C, the LCKMO films exhibit the remarkable TCR of 16.29% K -1 at 269.54 K, indicating the substantial potential of LCKMO films in infrared bolometers.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）