Materials
·
2021
·Vol. 14
·期 10
·2481
·
IF 3.623
Zhuo Zhao,Fang Fang,Junsheng Wu,Xinru Tong,Yanwen Zhou,Zhe Lv,Jian Wang,David Sawtell
Research on the preparation and performance of graphene composite materials has become a hotspot due to the excellent electrical and mechanical properties of graphene. Among such composite materials, zinc oxide/graphene (ZnO/graphene) composite films are an active research topic. Therefore, in this study, we used the vacuum thermal evaporation technique at different evaporation voltages to fabricate an amorphous ZnO/graphene composite film on a flexible polyethylene terephthalate (PET). The amorphous ZnO/graphene composite film inherited the great transparency of the graphene within the visible spectrum. Moreover, its electrical properties were better than those of pure ZnO but less than those of graphene, which is not consistent with the original theoretical research (wherein the performance of the composite films was better than that of ZnO film and slightly lower than that of graphene). For example, the bulk free charge carrier concentrations of the composite films (0.13, 1.36, and 0.47 × 1018cm−3corresponding to composite films with thicknesses of 40, 75, and 160 nm) were remarkably lower than that of the bare graphene (964 × 1018cm−3) and better than that of the ZnO (0.10 × 1018cm−3). The underlying mechanism for the abnormal electrical performance was further demonstrated by X-ray photoelectron spectroscopy (XPS) detection and first-principles calculations. The analysis found that chemical bonds were formed between the oxide (O) of amorphous ZnO and the carbon (C) of graphene and that the transfer of the π electrons was restricted by C=O and C-O-C bonds. Given the above, this study further clarifies the mechanism affecting the photoelectric properties of amorphous composite films.Keywords:amorphous;composite film;photoelectric properties;chemical bonds
研究领域:
材料科学
·
物理化学
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产品关联
DOI
PubMed
高影响因子
Energy Storage Materials
·
2020
·
IF 16.28
Chuanliang Wei,Huifang Fei,Yuan Tian,Yongling An,Huanhuan Guo,Jinkui Feng,Yitai Qian
Li metal is regarded as the most promising anode for lithium-based batteries due to its extremely high theoretical capacity and the lowest working potential. However, dendrite caused by uneven Li deposition inhibits its practical application. Here we propose a new concept of utilizing amorphous metallic nucleation seeds to induce the uniform deposition of Li. Amorphous 3 °C liquid metal coated on MXene framework is selected as an example for deep investigation. The results indicate that amorphous liquid metal nucleation seeds are stable against MXene and can induce isotropic nucleation and uniform growth of Li. The Coulombic efficiency and performance of symmetric cells are obviously improved both in ether-based and carbonate-based electrolyte under the regulation of amorphous liquid metal seeds. Full lithium metal cells with LiFePO 4 and crumpled MXene nanosheet encapsulated LiMn 2 O 4 cathodes also exhibit better electrochemical performance after modification. Additionally, the concept may be useful for developing other metal based anodes.
研究领域:
材料科学
·
能源存储
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产品关联
DOI
高影响因子
ChemElectroChem
·
2020
·Vol. 7
·期 7
·1567-1572
·
IF 4.154
Wanchun Qiao,Ang Qiao,Yunhang Tao,Shaoxuan Gu,Yuanzheng Yue,Haizheng Tao
Graphical Mill and heat : A chemo-mechanical milling process is used to prepare a highly conductive amorphous 0.5AgI ⋅ 0.5 Ag 3 PS 4 conductor. The mechanisms of the enhancement in ionic conductivity for the present 0.5AgI ⋅ 0.5 Ag 3 PS 4 amorphous powder together with the heat-treated one are discussed. Through a chemo-mechanical milling process, we prepared a highly conductive (1.1×10 −3 S ⋅ cm −1 ) amorphous 0.5AgI ⋅ 0.5 Ag 3 PS 4 conductor, which is much higher than that of pure amorphous Ag 3 PS 4 (8.5×10 −4 S ⋅ cm −1 ). Detailed structural characterizations indicate that compared to the ionic conductivity of the amorphous Ag 3 PS 4 conductor, the enhancement can be ascribed to the formation of mixed polymeric anions {[PS 4 ] m I n } around Ag + ions. Through heat-treatment at 370 °C for 20 minutes, the room temperature ionic conductivity of the 0.5AgI ⋅ 0.5 Ag 3 PS 4 conductor is further enhanced by about 4 times. This enhancement can be ascribed to the following two aspects: 1) the existence of residual amorphous phase with higher ionic conductivity; 2) the connection of the fast ionic conductive interfaces between the deposited Ag 7 PS 6 nano-crystals and the residual amorphous phase. This work reveals the key roles of both disorder and interface in improving the ionic conductivity of solid-state electrolytes.
研究领域:
材料科学
·
固态离子学
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DOI
高影响因子
Science China-Materials
·
2023
·Vol. 66
·期 4
·1383-1388
·
IF 8.1
Cheng Changgen,Ao Weidong,Ren Huijun,Fan Zhishuai,Xu Tingting,Dai Lei,Yin Peiqun
In this work, we have successfully constructed carbon nanotube (CNT)-a-CoS x amorphous heterostructured catalysts using a two-step method. The abundant active sites, superior electron transport properties, and large electrochemically active specific surface area enable amorphous CNT-a-CoS x to exhibit higher hydrogen evolution reaction performance than crystalline CNT-c-CoS x in acidic conditions. To deliver a cathodic current density of 10 mA cm −2 , the required overpotential is only 76 mV. No significant performance degradation is observed after 60,000 s of electrochemical durability test. This facile strategy provides technical support for the design and construction of amorphous heterostructured electrocatalysts with high activity and stability for the generation of green hydrogen.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Yujie Wang,Jiaying Liu,Yongbo Cui,Meng Liu,Wenxia Chen,Wei Wei,Haifeng Lu,Dongyun Han
The semi-hydrogenation of alkynes with high chemo and regioselectivity represents a significant yet challenging aspect in the synthesis of functionalized alkenes. A straightforward hydrothermal technique was utilized to synthesize amorphous cobalt sulfide polyhedra (CoS x ). This material facilitates the electrocatalytic semi-hydrogenation of terminal alkynes in water, particularly those possessing reducible groups such as C-I, C-Br, C-Cl, and C-O. The process yields impressive results, with a conversion rate of up to 99 % and a selectivity of as high as 95 %. Moreover, it demonstrates a wide substrate scope and excellent compatibility with a variety of functional groups. The high conversion rate of alkynes, coupled with the high selectivity for alkenes, and the catalyst's excellent versatility, collectively underscore the potential of our method.
研究领域:
化学
·
材料科学
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催化反应
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Ming Li,Xiandong Wang,Haoran Ruan,Qingyan Zhang,Zhenjun Wu,Yongping Liu,Zhenhuan Lu,Jiefeng Hai
Constructing heterojunction is one of the methods for improving the photocatalytic activity by restraining the electron-hole recombination. In this work, a simple cation-exchange approach was employed to grow amorphous MoS x (a-MoS x ) on PbS surface to fabricate PbS/a-MoS x heterojunction for the first time. The formation of a-MoS x has been confirmed by XRD, Raman, TEM, EDS and XPS analysis . PbS/a-MoS x composites showed improved light harvesting ability compared with pristine PbS. The optimized composite exhibited greatly enhanced photocatalytic activity using methylene blue as the target of elimination, and displayed a photocurrent about 9 times higher than pristine PbS due to the efficient separation of photogenerated electron-hole pairs.
研究领域:
材料科学
·
光催化
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DOI
高影响因子
APPLIED SPECTROSCOPY
·
2023
·
IF 3.5
Xinyuan Chen,Xiuzhi Chen,Hongyan Sun,Xiumin Li,Shizhao Ren,Can Jin,Hongjun Jin,Fenghua Chen,Rongrong Xue
Amorphous simvastatin (amorphous SIM) and Form I of SIM were prepared separately from SIM acetone (AC)/ethyl acetate (ETAC)/ethanol (ET) solutions by simply controlling the solvent evaporation rate, and the kinetic formation of amorphous SIM from SIM AC/ETAC/ET solutions was explained using mid-frequency Raman difference spectra analysis. The mid-frequency Raman difference spectra analysis results indicate that the amorphous phase has close connections with solutions and might be the bridge, playing an important role in the intermediate phase, between solutions and their outcome polymorphs.
研究领域:
药学
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材料科学
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光谱学
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DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 30
·2202928
·
IF 19.924
Jing-Shi Lei,Yi Zheng,Yu-Feng Meng,Fei Wang,Yan-Hui-Zhi Feng,Hai-Cheng Wang,Li-Bo Mao,Shu-Hong Yu,Zuo-Lin Wang
Minerals such as calcium carbonates and calcium phosphates are often used as drug protein carriers, which are urgently required for drug protein-based therapy, due to their high biocompatibility. However, their performance is constrained by some obstacles, such as the low loading capacity and short circulation half-life. Inspired by the in vivo growth of biominerals via the soluble protein-stabilized amorphous precursors, herein drug proteins are directly used to stabilize amorphous carbonated calcium phosphate (ACCP) in a controlled mineralization environment. The bioactivity of the drugs in the ACCP carrier is preserved due to the mild synthesis condition. The intrinsically high absorption capability of the ACCP nanoparticles (NPs) leads to an ultra-high protein loading capacity. In addition, the amorphous nature of the carrier ensures the homogeneous distribution of the protein molecules in the carrier, by which the drugs exhibit long-term release in vitro. The effectiveness of this strategy by the high osteogenic ability of insulin-like growth factor-1 loaded ACCP NPs is demonstrated. Therefore, this biomimetic strategy provides a promising nanoplatform for drug protein-based applications.
研究领域:
药学
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材料科学
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生物技术
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纳米技术
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2024
·
IF 15.7
Jieting Ding,Hao-Fan Wang,Kui Shen,Xiaoming Wei,Liyu Chen,Yingwei Li
The applications of metal-organic frameworks (MOFs) in electrocatalysis are limited by the perfect crystalline nature with insufficient coordinatively unsaturated sites and low electronic conductivity. Here, we report an electrosynthesis method to induce rapid assembly of amorphous MOFs on carbon cloth (denoted as a MnFc’/CC), achieving the amorphization of MOFs with rich active sites and high electronic conductivity. The long-range disordered structure of a MnFc’/CC forms a large number of oxygen vacancies to modify the coordination and electronic structures of Mn sites. In the electrocatalytic hydrazine oxidation reaction (HzOR), the a MnFc’/CC electrocatalyst exhibits superior activity to its crystalline MOF counterparts. Density functional theory calculations reveal that the unsaturated Mn centers present in aMnFc’/CC facilitate efficient electron transfer while simultaneously lowering the free energy of the rate-determining step in the HzOR process.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Meijia Liu,Lin Wu,Yafeng Li,Shuai Chen,Yuhang Lei,Zhuang Huo,Lin Tao,Lixiang Li,Chengguo Sun,Han Zhang,Baigang An
Non-precious metals with tailored phase structures show promise as oxygen evolution reaction (OER) catalysts due to their high inherent catalytic activity and extensive exposed active surface area. However, the mechanisms by which phase structures enhance catalytic performance remain unclear. Herein, we synthesized an amorphous cobalt boride (CoB) catalyst via a magnetic field-assisted method, yielding uniform nanoparticles that self-assemble into a nanobead structure. This material undergoes heat treatment to transition from an amorphous phase to a crystalline phase. The catalyst demonstrated exceptional OER activity and long-term stability in an alkaline electrolyte, requiring only 350 mV overpotential at 10 mA cm −2 . The amorphous CoB demonstrates remarkable durability by maintaining stable operation for 100 h under harsh conditions characterized by high alkalinity and elevated temperature without any observable performance degradation. We demonstrate that electrochemical activation of an amorphous catalyst can unveil active sites within the bulk material, leveraging the short-range order characteristic of amorphous structures. This process significantly amplifies the active site density, consequently enhancing the electrocatalytic performance of the amorphous catalyst in the oxygen evolution reaction within water oxidation. Furthermore, in situ Raman spectroscopy reveals that amorphous CoB rapid self-reconstruction upon electrochemical activation, leading to the formation of a metal (oxy)hydroxide active layer. This study offers valuable insights into the design of high-efficiency OER catalysts by elucidating the mechanisms underlying amorphous and crystalline materials.
研究领域:
材料科学
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电化学
·
能源转换
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2019
·Vol. 140
·期 4
·1791-1800
·
IF 2.471
Wang Xuan,Xiao Kesong,Liu Xiangnong,Wu Hao,Gao Cai
The phenomenological models based on fictive temperature and nonlinear Adam–Gibbs formulation have been widely used to describe the enthalpy relaxation kinetics. Although the parameters in Adam–Gibbs formulation are physically explicable, the reasonabilities of the parameters obtained from curve-fitting procedures have not been systematically discussed yet. In this work, differential scanning calorimetry was employed to measure the heat capacities of maltitol in both the amorphous and the crystalline states, and the data were used to generate the model parameters. Results showed that the configurational ground state plays an important role in extracting the model parameters. Selecting the crystal rather than the glass as the ground state seems to be effective to improve the reasonabilities of the fitted parameters. It suggested that even if the fit quality seems sound, the physical reasonability of the best-fit parameters still needs to be treated with caution.
研究领域:
材料科学
·
热力学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Juan Xie,Chen Yang,Ming Duan,Junlei Tang,Yingying Wang,Hu Wang,Jérémie Courtois
As a new photocatalyst , the photocatalytic hydrogen production performance of strontium titanate (SrTiO 3 , STO) modified by amorphous NiP was studied. The main purpose was to study the effect of amorphous NiP on hydrogen generation of STO under ultraviolet (UV) light irradiation. In this paper, STO catalysts were synthesized by hydrothermal method and the amorphous NiP was modified on the surface of STO by chemical plating method. The photocatalysts were characterized by X-ray diffraction (XRD), ultraviolet visible diffuse reflectance spectroscopy (DRS), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS). The results show that hydrogen generation rate of STO modified by amorphous NiP (NiP/STO) is much higher than that of STO. Furthermore, the deposition time of chemical plating affects the hydrogen generation performance a lot. The results demonstrate that when the deposition time is 10 s, the hydrogen generation rate reaches almost 3 times higher than the other deposition time. The DRS results indicate that NiP/STO has narrower band gap than STO. Combination of the results of DRS, Mott-schottky (M-S) and XPS, the mechanism of photocatalytic hydrogen generation was obtained. The cause of higher hydrogen generation rate may be ascribed to the different electronic migration path in NiP/STO.
研究领域:
材料科学
·
能源科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）