ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 19
·2011073
·
IF 18.808
Huiying Chen,Linlin Zhou,Zhi Fang,Shuize Wang,Tao Yang,Laipan Zhu,Xinmei Hou,Hailong Wang,Zhong Lin Wang
Inorganic lead halide perovskite has become an emerging material for modern photoelectric and electronic nanodevices due to its excellent optical and electronic properties. In view of its huge dielectric and electrical properties, inorganic CsPbBr 3 perovskite is introduced into the piezoelectric nanogenerator (PENG). Based on one-step electrospinning of solutions containing CsPbBr 3 precursors and polyvinylidene difluoride (PVDF), in situ growth of CsPbBr 3 nanocrystals in PVDF fibers (CsPbBr 3 @PVDF composite fibers) with highly uniform size and spatial distribution are synthesized. The CsPbBr 3 @PVDF composite fibers based PENG reveals an open-circuit voltage ( V oc ) of 103 V and a density of short-circuit current ( I sc ) of 170 µ A cm −2 , where the V oc is comparable to the state-of-the-art hybrid composite piezoelectric nanogenerators (PENGs) and the density of I sc is 4.86 times higher than that of lead halide perovskites counterpart ever reported. Moreover, CsPbBr 3 @PVDF composite fibers based PENG exhibits fundamentally improved thermal/water/acid–base stabilities. This study suggests that the CsPbBr 3 @PVDF composite fiber is a good candidate for fabricating high-performance PENGs, promising application potentials in mechanical energy harvesting and motion sensing technologies.
研究领域:
材料科学
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纳米技术
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能源 harvesting 技术
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Shumao Qi,Lu Xu,Haiyang Shao,Chen Huang,Lin Ma,Jiaguang Han,Xiaogang Xue,Mingjin Zhang,Hongjuan Ma
With the rapid expansion of the new energy industry and electronics market, the demand for lithium is growing rapidly, leading to a significant increase in the price of the metal. There has been great interest in lithium extraction from salt lakes. The powdered lithium ion-sieve (LIS) suffers from poor dispersion and difficult recovery. Composite polyvinyl alcohol (PVA) nanofiber mats with H 1.6 Mn 1.6 O 4 (HMO) were prepared by electrostatic spinning and radiation induced cross-linking. HMO was immobilized in the nanofiber mats by covalent attachment, cross-linking and entrapment. Hydrophilicity of PVA, high porosity of nanofiber and cross-linked 3D network endow the HMO/PVA nanofiber mats good mechanical strength, excellent Li + adsorption performance and long service life. 1/1-HMO/PVA nanofiber mats exhibit Li + adsorption capacity of 30.1 mg/g in salt-lake brine, which was superior to most LIS-containing adsorbents. Even in real salt-lake water with very low Li concentration of 15.45 mg/L and high Mg/Li ratio of 1260/1, the nanofiber mats have an excellent adsorption capacity of 24.2 mg/g and high distribution coefficient of 9713.34 mL/g, which was close to that of HMO powder. After ten adsorption and elution repetitions Li + adsorption capacity decreased less than 10%, which indicates the long-term stability of the HMO/PVA nanofiber mats. The loss rate of Mn is less than 5% and gradually decreases with the increase of the number of cycles. The present study demonstrates the potential application of HMO/PVA nanofiber mats for direct recovery of Li + from salt-lake especially in low-grade high Mg/Li ratio liquid lithium ore where holds a large proportion of the typical salt-lakes in China.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2023
·Vol. 41
·期 23
·3197-3204
·
IF 5.4
Hui Zhang,Yuan Zhou,Tonghui Guo,Xiang Zhang,Zhenkun Zhu,Junjun Jin,Xiaxia Cui,Dan Zhang,Zhen Wang,Lin Li,Nai Wang,Guanqi Tang,Qidong Tai
Comprehensive Summary Formamidinium (FA)-based Sn-Pb perovskite solar cells (FAPb 0.5 Sn 0.5 I 3 PSCs) with ideal bandgap and impressive thermal stability have caught enormous attention recently. However, it still suffers from the challenge of realizing high efficiency due to the surface imperfections of the transport materials and the energy-level mismatch between functional contacts. Herein, it is demonstrated that the modification on buried interface with alkali metal salts is a viable strategy to alleviate these issues. We systematically investigate the role of three alkali metal bromide salts (NaBr, KBr, CsBr) by burying them between the NiO x hole transport layer (HTL) and the perovskite light-absorbing layer, which can effectively passivate interface defects, improve energy-level matching and release the internal residual strain in perovskite layers. The device with CsBr buffer layer exhibits the best power conversion efficiency (PCE) approaching 20%, which is one of the highest efficiencies for FA-based Sn-Pb PSCs employing NiO x HTLs. Impressively, the long-term storage stability of the unencapsulated device is also greatly boosted. Our work provides an efficient strategy to prepare desired FA-based ideal-bandgap Sn-Pb PSCs which could be applied in tandem solar cells.
研究领域:
材料科学
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Yingying Wang,Hui Pan,Jiaojiao Bi,Peng Kang
The efficiency of hydrogen generation is constrained by oxygen evolution reaction (OER), which involves complex electron transfer processes. In order to design an efficient and stable catalyst for OER, we prepared a series of Ru-based catalysts by interface engineering and defect engineering. Among them, Ru–Co 3 O 4 -TM-8h demonstrated excellent OER activity (η = 243 mV @10 mA cm −2 ) and long-term stability (200 h @100 mA cm −2 ) in 1 M KOH. Besides, Ru–Co 3 O 4 -TM-8h || Pt/C can continuously operate for 100 h at 500 mA cm −2 . The loose and porous nano-flower morphology of Ru–Co 3 O 4 -TM-8h facilitates gas release and enhances electrolyte accessibility, exposing the active sites. The heterojunction interface between Ru and Co 3 O 4 optimizes the electronic structure of Ru sites, thereby suppressing the peroxidation reaction of Ru and improving the OER stability of Ru–Co 3 O 4 -TM-8h. This study offers valuable insights for the design of Ru-based catalysts with long-term stability in alkaline media.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Weijun Zhou,Ping Wang,Zhipeng Chen,Xuefei Wang,Huogen Yu
Traditionally, nano-titanium dioxide (TiO 2 ) is widely regarded as an effective hydrophilic material due to its certain amount of hydroxyl groups. However, the limited hydroxyl groups and the poor network structure of the TiO 2 surface result in suboptimal hydrophilicity and stability. In this study, a stable and long-lasting superhydrophilic Fe-coordinated tannic acid (TA) network is constructed by introducing TA and Fe 3+ to form a hydroxyl-rich 3D network on the surface of TiO 2 . The hydrophilicity test results demonstrated that the Fe-TA/TiO 2 film exhibited exceptional superhydrophilic property with a water contact angle of 1.3°, significantly lower than that of the TA/TiO 2 film (18.2°) and the TiO 2 film (65°). Importantly, it maintained long-lasting superhydrophilicity (water contact angle < 10°) for more than 16 days. The superhydrophilicity and long-term stability of the Fe-TA/TiO 2 film can be attributed to the abundance of hydroxyl groups and the stable Fe-coordinated TA 3D networks. This study presents a promising methodology for optimizing the TiO 2 surface through metal-organic coordination for enhanced long-term superhydrophilicity.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Qiang Xue,Wenqiao Meng,Yi Li,Qing Fang,Kaisong Zhang
The traditional 2D nanosheets, given its relatively large size, has obstacles in water transmission and may also cause non-selective defects in polyamide membranes. To account for size effects, we successfully synthesized MXene quantum dots (MQDs) with ultra-small size through simple hydrothermal reaction, which were then utilized to construct MQDs polyamide nanofiltration membranes. Compared to the blank membrane, the MQDs membranes prepared obtained remarkable improvements in permeance and salt rejection, achieving a water permeance of 16.3 Lm −2 h −1 bar −1 and Na 2 SO 4 rejection of 98.2%. Furthermore, MQDs membranes demonstrate exceptional antifouling properties and long-term performance stability. Molecular simulation reveals that the incorporation of MQDs effectively restricts the diffusion of piperazine (PIP) into the organic phase, thereby forming a loose membrane structure. Simulation of the transport process confirms that the loose membrane structure is more conducive to water transport, and exhibits reduced contact force between bovine serum albumin (BSA) pollutants and the surface of MQDs membranes. This work sheds light on high-performance nanofiltration via MQDs-regulated interfacial polymerization strategy.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Environmental Technology & Innovation
·
2024
·
IF 6.7
Qiaocheng Feng,Mei Cui,Jingru Chen,Xueyi Zheng,Liangqia Guo
Fluorescent labeling and imaging is a useful tool to track the temporal and spatial distribution of microplastics (MPs) with size and shape features. However, the limited fluorescently labeled MPs spheres, photo-bleaching and leaching of organic small molecular dyes hamper the tracking of MPs in the environment. In this work, phenyl-modified carbon nitride (PMCN) fluorescent polymer was prepared and applied for the staining of eight different types of MPs. The interface interaction mechanism between PMCN fluorescent polymer and MPs was investigated by the desorption experiments. The long-time photo-stability of the stained MPs against ultraviolet (UV) light irradiation, freeze-thaw cycles, various environmental factors and real environmental water samples was evaluated. The MPs stained with PMCN fluorescent polymer showed more robust stability than the common dye (Nile red) against the damage when exposure to UV light for 72 h, treatment with freeze-thaw cycles for 60 days, exposure to strong acid, strong alkali, high salinity, freshwater (river and lake) or seawater for 60 days. Results indicate PMCN fluorescent polymer is promising as a convenient, efficient and universal fluorescent tracer for visually tracking the migration and distribution of MPs in environmental water system.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Zhijuan Zheng,Wenjing Xu,Yang Wang,Weijie Xiong,Caihua Xiong,Lijun You,Shaoyun Wang
Conductive hydrogels as promising candidates of wearable electronic have attracted considerable interest in health monitoring, multifunctional electronic skins, and human-machine interfaces. However, to simultaneously achieve excellent electrical properties, long-term stability, and water vapor permeability of conductive hydrogels remains a challenge. Herein, a highly conductive hydrogel (MPRS) with high breathability (5.90 mg∙cm −2 ∙h −1 ), excellent electrical conductivity (6.67 S/m), high elongation (315%), and remarkable water retention properties was prepared adopting cold freeze-thawing method. MXene, poly (3, 4-ethylenedioxythiophene): poly (styrenesulfonate) (PEDOT: PSS), and reduced graphene oxide were used as conductive materials, while silk fibroin (SF) and polyvinyl alcohol (PVA) were used as the gel matrix. Lithium chloride solution was used as a solvent during the preparation process. The strain sensor based on this hydrogel demonstrates rapid response (0.33 s) and recovery ability (0.31 s) to strain stimuli. Upon 250 cycles of stretching at 35% strain, the output signal remains stable and highly repeatable, ensuring accurate detection of human joint movements and facial expressions. The fabrication of flexible electrodes using the hydrogel enabled real-time monitoring of human electromyography and electrocardiogram signals. The applications in a 2D sensor array and human-machine interaction interfaces also proved the excellent performance of this conductive hydrogels in wearable sensor.
研究领域:
材料科学
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生物医学工程
·
可穿戴设备
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
·
2015
·
IF 3.615
Miao Jiang,Li Yan,Yunjie Ding,Qi Sun,Jia Liu,Hejun Zhu,Ronghe Lin,Fengshou Xiao,Zheng Jiang,Jingyue Liu
The heterogenization of homogeneous catalysts is of critical importance for both fundamental research and practical applications. The key obstacle to industrial applications of heterogenized homogeneous catalysts is the long-term stability of the immobilized molecular complexes. We unambiguously demonstrate in this report that the vinyl-functionalized PPh 3 polymers supported single Rh sites (Rh/POL–PPh 3 ) catalyst provided not only excellent catalytic activity but also ultrahigh stability for fixed-bed olefins hydroformylation , which is one of the most important industrial homogeneous catalytic processes for the synthesis of aldehydes and alcohols. HAADF-STEM and EXAFS results indicated that the Rh atoms were present in single Rh sites which were strongly coordinated with the exposed phosphorous atoms of the POL–PPh 3 support. The Rh/POL-PPh 3 catalyst provided high activity and selectivity because it maintained the catalytic functionalities similar to the homogeneous HRh(CO)(PPh 3 ) 3 complex, as demonstrated both by 31 P MAS NMR and in situ FT-IR experiments. Thus a reaction mechanism, similar to that over the homogeneous HRh(CO)(PPh 3 ) 3 complex, was proposed for olefin hydroformylation over the novel Rh/POL–PPh 3 catalyst.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
2D Materials
·
2020
·Vol. 7
·期 4
·045016
·
IF 7.14
Yi-Hang Gu,Xi Yan,Yan Chen,Xiao-Jing Guo,Wan-Zhong Lang
The Graphene oxide (GO) membranes, as the most studied and accessible two-dimensional (2D) membranes, have performed their expected separation performance, but instability of these delicate membranes still hinders their development. Layer-by-layer (LBL) self-assembly is one smart method for preparing versatile 2D membranes with stable structure by chemical bonds or other forces. Herein, the 2D GO laminar membranes were prepared on the modified Nylon-6 substrates via LBL method by employing positively charged P–GO (guanidine modified GO nanosheets) and negatively charged S–GO (sulfonated GO nanosheets) as assembly flakes. This smart strategy was established on the superiority of LBL method by adjusting the assembly layer number and outermost charge when faced up with the different targeted contaminants. Benefited from the compact structures and intense charge, the LBL membranes can almost remove all the employed dyes (above 98% rejection for ML11 membrane). Furthermore, these membranes also show the high selectivity to water molecular in desalination (93.4% rejection to Na2SO4 and 72.7% rejection to NaCl for ML11 membrane). The membranes can endure the filtration of dye wasterwater and salt solution for above 168 h under cross-flow mode without rejection decline. Also, these versatile LBL membranes reveal high resistance to both chemical corrosion and bacterial attack, which is suitable for the continuous separation even under hostile external environment.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Yang Ding,Benlin He,Jingwei Zhu,Wenyu Zhang,Guodong Su,Jialong Duan,Yuanyuan Zhao,Haiyan Chen,Qunwei Tang
An all-inorganic cesium lead bromide (CsPbBr3) halide has attracted growing attention for carbon-based perovskite solar cells (PSCs) owing to its inherent stable lattice in thermal and/or moisture ambient. The main drawback for carbon-based CsPbBr3 PSCs is the low power conversion efficiency (PCE) caused by serious charge recombination at perovskite surfaces and/or device interfaces. To address this problem, an interface engineering strategy by modifying a polyvinyl acetate (PVAc) polymer with a carbonyl group at the interface of CsPbBr3/carbon is implemented to passivate perovskite surface defect states and also to improve energy-level alignment between the valence band of CsPbBr3 and work function of carbon, suppressing charge recombination and accelerating charge separation. By introducing the graphene oxide (GO) layer for further promoting hole extraction and decreasing energy-level difference, the PSC with an architecture of FTO/c-TiO2/m-TiO2/CsPbBr3/PVAc/GO/carbon achieves a champion PCE as high as 9.53%, yielding an improvement by 44.0% compared with 6.62% for the original device. Furthermore, the optimal device free of encapsulation exhibits remarkable long-term stability under high humidity, high temperature, and continuous illumination in air. This work provides a new polymer as the interface modification material for reducing defect states as well as enhancing energy-level alignment and suggests an effective approach for fabricating efficient and stable carbon-based CsPbBr3 PSCs.
研究领域:
材料科学
·
光伏技术
·
表面化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 9
·期 6
·2145-2155
·
IF 7.059
Yongjin Long,Chenyang Wang,Xiaohui Liu,Jiahao Wang,Shiqiang Fu,Jing Zhang,Ziyang Hu,Yuejin Zhu
The all-inorganic CsPbIBr2 perovskite solar cell (PSC) has received tremendous attention due to its favorable photoelectric properties and superior stability against moisture and heat attack. Nevertheless, the reported power conversion efficiency (PCE) of CsPbIBr2 PSC is still far from its counterparts, mainly because of the inferior film crystallization and morphology of the CsPbIBr2 light-absorbing layer, along with much trap defects and severe charge recombination. Herein, all-inorganic perovskite CsPbIBr2 is doped with ZnBr2 to improve crystallinity and morphology, optimize energy level alignment and enhance photovoltaic performance of PSC. Consequently, with the optimized concentration of Zn2+ (1%, at.), CsPb0.99Zn0.01IBr2-based PSC shows the highest PCE of 10.51%, which is 34% higher than that of CsPbIBr2-based PSCs (7.84%). Furthermore, the unencapsulated CsPb0.99Zn0.01IBr2-based device exhibits superior long-term stability in ambient atmosphere and against heat. This study provides a feasible strategy for preparing a high quality perovskite film and improving the photovoltaic performance and long-term stability of CsPbIBr2 PSCs, aiming at promoting the potential applications of CsPbIBr2-based PSCs.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）