Frontiers of Materials Science
·
2020
·Vol. 14
·期 3
·332-340
·
IF 1.747
Wang Wei,Gong Jinhui,Guo Siyu,Jiang Lin,Liu Shaochao,Wang Li
Low-dimensional halide perovskites (HPs) have received considerable attention in recent years due to their novel physical properties such as compositional flexibility, high quantum yield, quantum size effects and superior charge transport. Here we show room temperature solution synthesis of 1D organic-inorganic lead bromide perovskite microwires (MWs). Our method uses acetone as a reactant, and when CH 3 NH 3 PbBr 3 is immersed, acetone reacts with CH 3 NH 3 + cations in the CH 3 NH 3 PbBr 3 single crystal by the dehydration condensation. The reaction generates a large (CH 3 ) 2 C = NHCH 3 + A-site which cannot be accommodated by the cuboctahedron formed by the corner-sharing [PbBr 6 ] 4− octahedral, leading to the transition of corner-sharing octahedra to face-sharing triangular prism and the crystal structure transformation from 3D to 1D. The formation process of (CH 3 ) 2 C = NHCH 3 PbBr 3 MWs does not involve any ligands, templates or catalysts. A two-terminal memory device was constructed using the (CH 3 ) 2 C = NHCH 3 PbBr 3 MWs, showing great potential of the method in fabrication of electronic and optoelectronic devices.
研究领域:
材料科学
·
纳米技术
·
化学
·
物理学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2020
·Vol. 11
·期 1
·1-11
·
IF 12.121
Zhang Ning,Feng Xiaobin,Rao Dewei,Deng Xi,Cai Lejuan,Qiu Bocheng,Long Ran,Xiong Yujie,Lu Yang,Chai Yang
Anodic oxygen evolution reaction (OER) is recognized as kinetic bottleneck in water electrolysis. Transition metal sites with high valence states can accelerate the reaction kinetics to offer highly intrinsic activity, but suffer from thermodynamic formation barrier. Here, we show subtle engineering of highly oxidized Ni 4+ species in surface reconstructed (oxy)hydroxides on multicomponent FeCoCrNi alloy film through interatomically electronic interplay. Our spectroscopic investigations with theoretical studies uncover that Fe component enables the formation of Ni 4+ species, which is energetically favored by the multistep evolution of Ni 2+ →Ni 3+ →Ni 4+ . The dynamically constructed Ni 4+ species drives holes into oxygen ligands to facilitate intramolecular oxygen coupling, triggering lattice oxygen activation to form Fe-Ni dual-sites as ultimate catalytic center with highly intrinsic activity. As a result, the surface reconstructed FeCoCrNi OER catalyst delivers outstanding mass activity and turnover frequency of 3601 A g metal −1 and 0.483 s −1 at an overpotential of 300 mV in alkaline electrolyte, respectively.
研究领域:
电化学
·
催化
·
材料科学
·
表面科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 9
·6779-6785
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IF 2.22
Wu Bao-Shui,Wang Peng,Song Jian
A mixed-solvothermal method was used to synthesize the α-Fe 2 O 3 nanoparticles with nearly spherical, rod-like, disk-like morphologies by varying the precipitant or solvent. When used as the anode material for Li-ion batteries, the nearly spherical α-Fe 2 O 3 nanoparticles with a high monodispersity and an average diameter of about 50.5 nm exhibited much better cycle stability and rate performance than their disk-like and rod-like equivalents. Their reversible capacity reached up to 1500 mAh/g that far exceeded their theoretical value (1007 mAh/g) at a current density of 0.1 A/g. Even after 100 cycles, there was still a capability retention of about 1200 mAh/g. Moreover, the analysis of the Nyquist plots revealed that the nearly spherical α-Fe 2 O 3 nanoparticles presented the lowest charge-transfer resistance among the three samples. The present study provides an effective way to control the morphologies of nanoparticles, and these nanostructures would present great potentials for the applications in LIBs or some other fields.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
BIOTECHNOLOGY LETTERS
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2021
·Vol. 43
·期 8
·1617-1624
·
IF 2.461
Wang Liuzhu,Jiang Shuiqin,Sun Yangyang,Yang Zeyu,Chen Zhi,Wang Hualei,Wei Dongzhi
Objectives Catalytic promiscuity, or the ability to catalyze a secondary reaction, provides new opportunities for industrial biocatalysis by expanding the range of biocatalytic reactions. Some nitrilases converting nitriles to amides, referred to as the secondary activity, show great potential for amides production. And our goal was exploiting the amide-forming potential of nitrilases. Results In this study, we characterized and altered the secondary activity of nitrilase from Acidovorax facilis 72 W (Nit72W) towards different substrates. We increased the secondary activity of Nit72W towards 2-cyanopyridine by 196-fold and created activity toward benzonitrile and p-nitrophenylacetonitrile by modifying the active pocket. Surprisingly, the best mutant, W188M, completely converted 250 mM 2-cyanopyridine to more than 98% 2-picolinamide in 12 h with a specific activity of 90 U/mg and showed potential for industrial applications. Conclusions Nit72W was modified to increase its secondary activity for the amides production, especially 2-picolinamide.
研究领域:
生物化学
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工业生物技术
✓ 已验证
DOI
PubMed
高影响因子
Clean Technologies and Environmental Policy
·
2023
·Vol. 25
·期 9
·2929-2949
·
IF 4.3
Soni Ashish,Das Pankaj Kumar,Kumar Sanjay
The recycling of waste plastics has been recognized as an enticing approach towards the circular economy. The post-consumer plastic products with the incorporation of agro-industrial waste were utilized for the advancement of value-added composites for structural applications. The properties of the composites, namely density, water absorption, compressive strength, flexural strength and abrasive wear, were found to influence by the type of plastics which increases the complexity in the material selection. The research proposed an integrated Analytic Hierarchy Process—Weighted Aggregated Sum Product Assessment (AHP-WASPAS) mathematical model for ranking the composites. The research identified the amalgamation of 15 wt % of rice husk ash and 15 wt % of sand with 70 wt % of polyetheretherketone (PEEK) as a suitable composite for structural applications having minimum abrasive wear and water absorption of 0.0937 cm 3 and 0.05059%, respectively. The maximum density, flexural strength and compressive strength were found to be 1.5116 g/cm 3 , 6.564 MPa and 32.7933 MPa, respectively. Spearman's rank correlation coefficient (SRCC) between the proposed AHP-WASPAS model, and AHP-Weighted Sum Method (WSM), AHP-Technique for Order Performance by Similarity to Ideal Solution (TOPSIS), AHP-COmplex PRoportional ASsessment (COPRAS), AHP-Multi-Objective Optimization on the basis of Ratio Analysis (MOORA), AHP-Multi-Attributive Border Approximation area Comparison (MABAC) and AHP-Additive Ratio Assessment (ARAS) was in the range of 0.7854–1. The sensitivity analyses have observed that the ranking is influenced by the changes in criteria weights includes, density, water absorption, compressive strength, flexural strength and abrasive wear. Moreover, the rankings are unaffected by the parameter lambda ( λ ) in the WASPAS method. The research has verified the feasibility of waste plastics and agro-industrial waste as innovative materials. Moreover, the proposed mathematical model is reliable and enhances the material selection process in the development of composites.
Graphical abstract
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Frontiers of Environmental Science & Engineering
·
2020
·Vol. 15
·期 4
·1-10
·
IF 4.053
Liu Xuefeng,You Shijie,Ma Fang,Zhou Hao
Electrode fouling is a problem that commonly occurs during electro-oxidation water purification. This study focused on identifying the fouling behavior of Pt electrode associated with the formation of polymeric layer during electro-oxidation of phenol. The in situ electrochemical measurements and non-destructive observation of the electrode morphology were reported. The results demonstrated that the electrode fouling was highly dependent on thermodynamic process of electrode that was controlled by anode potential. At anode potential lower than 1.0 V vs SHE, the direct electro-oxidation caused the electrode fouling by the formation of polymeric film. The fouling layer decreased the electrochemically active surface area from 8.38 cm 2 to 1.57 cm 2 , indicated by the formation of polymeric film with thickness of 2.3 µm, increase in mass growing at a rate of 3.26 µg/cm/min. The degree to which the anode was fouled was independent of anion in the electrolyte. In comparison, at anode potential higher than 2.7 V vs SHE, the anions (e.g., chloride) could exert a major influence to the behavior of electrode fouling. The presence of chloride was shown to mitigate the fouling of electrode significantly through preventing the formation of polymeric film by active chlorine (e.g., Cl• and Cl 2 ) produced from anodic oxidation of chloride. Since chloride is the most abundant anionic species existing in both natural and engineered water system, this study not only offers a deep insight into the mechanism of electrode fouling, but also suggests strategies for anti-fouling in the presence of chloride in electro-oxidation process.
研究领域:
环境科学
·
电化学工程
✓ 已验证
DOI
高影响因子
Frontiers of Materials Science
·
2021
·Vol. 15
·期 2
·266-279
·
IF 2.765
Wang Nannan,Zheng Youbin,Feng Yange,Zhang Liqiang,Feng Min,Li Xiaojuan,Wang Daoai
Adsorption of drug powder is caused by triboelectrification on the surface of starch capsule during filling process. Furthermore, high wear rate and poor water lubricity also hinder the further practical applications of traditional starch capsule. To solve these problems, a glycerol-modified starch capsule with perfect anti-triboelectrification and enhanced lubrication performance was fabricated. Hydrogen bond between glycerol and starch molecules could reduce the bound water content on the capsule surface and thus realizes anti-triboelectrification. By adding glycerol, a three-tier structure composed of starch-glycerol-water is formed through hydrogen bonding on the surface of the starch film, which has been proven to be favorable for lubrication performance. When 5% glycerol is added, the short-circuit current ( I sc ) of starch-based triboelectric nanogenerator (TENG) is reduced by 86%, and the wear volume of the starch film is reduced by 89%. Under water lubrication condition, the lubrication performance of the starch-glycerol film can reach the super lubricated level with a friction coefficient of about 0.005. This work provides a new route to obtain modified starch capsules with improved anti-triboelectrification property, reduced wear rate and superlubricity property.
研究领域:
材料科学
·
制药工程
·
表面化学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-13
·
IF 16.6
Xie Xinjian,Xu Zhonggang,Yu Xin,Jiang Hong,Li Hongjiao,Feng Wenqian
Conductive hydrogels require tunable mechanical properties, high conductivity and complicated 3D structures for advanced functionality in (bio)applications. Here, we report a straightforward strategy to construct 3D conductive hydrogels by programable printing of aqueous inks rich in poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) inside of oil. In this liquid-in-liquid printing method, assemblies of PEDOT:PSS colloidal particles originating from the aqueous phase and polydimethylsiloxane surfactants from the other form an elastic film at the liquid-liquid interface, allowing trapping of the hydrogel precursor inks in the designed 3D nonequilibrium shapes for subsequent gelation and/or chemical cross-linking. Conductivities up to 301 S m −1 are achieved for a low PEDOT:PSS content of 9 mg mL −1 in two interpenetrating hydrogel networks. The effortless printability enables us to tune the hydrogels’ components and mechanical properties, thus facilitating the use of these conductive hydrogels as electromicrofluidic devices and to customize near-field communication (NFC) implantable biochips in the future.
研究领域:
材料科学
·
生物医学工程
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纳米技术
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电气工程
✓ 已验证
DOI
PubMed
高影响因子
Frontiers of Chemical Science and Engineering
·
2021
·Vol. 15
·期 5
·1312-1321
·
IF 4.204
Wang Wei,Lv Haijun,Du Juan,Chen Aibing
In this present work, N-doped carbon nanobelts (N-CNBs) were prepared by a confined-pyrolysis approach and the N-CNBs were derived from a polypyrrole (Ppy) tube coated with a compact silica layer. The silica layer provided a confined space for the Ppy pyrolysis, thereby hindering the rapid overflow of pyrolysis gas, which is the activator for the formation of carbonaceous materials. At the same time, the confined environment can activate the carbon shell to create a thin wall and strip the carbon tube into belt morphology. This process of confined pyrolysis realizes self-activation during the pyrolysis of Ppy to obtain the carbon nanobelts without adding any additional activator, which reduces pollution and preparation cost. In addition, this approach is simple to operate and avoids the disadvantages of other methods that consume time and materials. The as-prepared N-CNB shows cross-linked nanobelt morphology and a rich porous structure with a large specific surface area. As supercapacitor electrode materials, the N-CNB can present abundant active sites, and exhibits a specific capacitance of 246 F·g −1 , and excellent ability with 95.44% retention after 10000 cycles. This indicates that the N-CNB is an ideal candidate as a supercapacitor electrode material.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 4
·1-8
·
IF 5.479
Qu Fengdong,Zhang Shendan,Zhang Bingxue,Zhou Xinxin,Du Shiyu,Lin Cheng-Te,Ruan Shengping,Yang Minghui
Hierarchical Co 3 O 4 @NiMoO 4 core-shell nanowires (NWs) were synthesized utilizing a two-step hydrothermal method. The NWs show a high chemiresistive response (at a temperature of 255 °C) to xylene, with an R gas /R air ratio of 24.6 at 100 ppm xylene, while the response towards toluene, benzene, ethanol, and acetone, CO, H 2 S and NO 2 is much weaker. In contrast, pure Co 3 O 4 nanowires exhibit weak responses to all the vapors/gases and poor selectivity. The new NW sensor displays an almost linear response (1–100 ppm) to xylene and a lower detection limit of 424 ppb. The remarkable gas sensing characteristics are attributed to the synergistic catalytic effect and the formation of a heterostructure between Co 3 O 4 and NiMoO 4 .
Schematic presentation of a xylene vapor chemiresistive sensor based on Co3O4@NiMoO4 core-shell nanowires. The Co3O4@NiMoO4 core-shell nanowires-based sensor exhibits a high response (24.6) to 100 ppm xylene at 255 °C and high response/recovery speed (13–15 and 25–29 s).
研究领域:
材料科学
·
化学传感器
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2019
·Vol. 35
·期 4
·549-555
·
IF 1.071
Lu Xue,Liu Guocheng,Wang Xiang,Lin Hongyan,Wang Xiuli
We synthesized three new Ni(II) coordination polymers [Ni(L)(HIP)(H 2 O) 2 ]H 2 O(CP 1 ), [Ni(L)(NIP)]·2H 2 O(CP 2 ) and [Ni(L)(NDC)(H 2 O) 2 ](CP 3 )[L= N , N' -bis(pyridine-3-yl)thiophene-2,5-dicarboxamide, H 2 HIP=5-hydroxyisophthalic acid, H 2 NIP=5-nitroisophthalic acid, H 2 NDC=2,6-naphthalenedicarboxylic acid] by hydrothermal method, which were characterized by means of infrared spectra(IR), TG analyses, PXRD and single-crystal X-ray diffraction. The CP 1 is a 1D tubular structure based on [Ni-HIP] 2 loops and pairs of L ligands. CP 2 is a 2D 3,5-connected architecture, which consists of Ni-L linear chains and (Ni-NIP) 2 double chains. CP 3 is a 2D network, which features 4-connected topology. Solid-state luminescent behaviours of CP 1 —CP 3 were investigated. The CP 1 can detect Fe 3+ ions through luminescence quenching. The electrochemical properties of CP 1 buk-modified carbon paste electrode(CP 1 -CPE) has also been investigated, which has bifunctional electrocatalytic activity for oxidation of ascorbic acid and reduction of NO 2 − .
研究领域:
材料化学
·
配位化学
·
分析化学
✓ 已验证
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2019
·Vol. 29
·期 6
·2124-2132
·
IF 1.637
Wang Zirui,Wang Xinyu,Li Jingfang,Li Weizuo,Li Guangming
In this work, a facile and fast luminescence sensing platform for the ratiometric detection of hydrogen sulfide (H 2 S/HS − ) has been constructed by encapsulating the Eu 3+ /β-diketone chromophore into the host framework of MIL-140 (Eu 3+ /TFA@MIL-140C, TFA = 1,1,1-Trifluoro-2,4-pentanedione). It is well known that the energy transfer from the host framework or/and TFA to the Eu 3+ ions can be disturbed easily by some metal ions, such as Cu 2+ ions. Therefore, the ratiometric sensor was constituted with the Eu 3+ /β-diketone moiety as the response signal and the host framework moiety as the reference signal. Furthermore, on the basis of the hard–soft acid–base theory, the Cu 2+ ions could be rapidly caught by HS − , profiting from the low solubility of CuS, realizing the real-time detection by luminescence color change. This sensor shows remarkable property on the detection of H 2 S (HS − in water solution) with low limit of detection (LOD = 7.43 μM) and short response time (< 0.5 min). The good linearity between luminescent intensity and concentration makes the luminescent ratio meter feasible.
研究领域:
材料科学
·
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）