Current Nanoscience
·
2022
·Vol. 18
·期 1
·94-105
·
IF 1.513
Ailing Yang,Lele Wang
Background: Semiconductor nanomaterials are being employed for the degradation of organic compounds under solar light irradiation. Introduction: Cu2O nanomaterial is suitable for visible-light photocatalysis because the narrow band-gap (∼2.17 eV) allows it to absorb visible light. However, the morphological changes of Cu2O during photocatalysis have been rarely investigated. Methods: Porous Cu2O nanoshells (NSs) with a nearly 100% hollow structure were synthesized by a two-step addition of reducer. The synthesized NSs were characterized and employed for the photocatalysis of methyl orange (MO) in a neutral solution at 30 °C in air. Results: The Cu2O NSs exhibited high adsorption and good photocatalysis rates with respect to the degradation of MO. Certain new phenomena were observed upon photocatalysis. Nearly all the chemical bonds in MO were fractured; however, a portion of the sulfur-containing group in MO remained on the NSs. The morphology of the Cu2O NSs changed and a large amount of nano-debris was produced. Further experimental analysis indicated the presence of some nano-debris after adsorption- desorption equilibrium (ADE). A negligible amount of nano-debris appeared during the light irradiation of the Cu2O suspension in the absence of MO. The results obtained via X-ray diffraction (XRD), scanning transmission electron microscopy (STEM) and high-resolution transmission electron microscopy (HRTEM) proved that the nano-debris was composed of Cu2O, and essentially comprised nanosheets that were discarded from the Cu2O NSs. Conclusion: The porous NSs were composed of Cu2O nanosheets with exposed {111} facets, which resulted in their strong adsorption ability and catalysis performance for the degradation of MO. Light irradiation accelerated this interaction and led to the discarding of Cu2O nanosheets from the Cu2O NSs. Because of the strong interaction between Cu+ and S, a portion of the sulfur-containing group in MO remained on the NSs after photocatalysis.
研究领域:
纳米材料
·
光催化
·
环境化学
·
材料科学
·
半导体物理
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yuzhe Zhang,Zhenhao Fan,Jie Hua,Xin Gao,Liwei Lin,Zhongyu Li
Neodymium is a crucial strategic resource, which requires enhanced adsorption and recovery methods. Various researchers have utilized chitosan as an adsorbent for neodymium element adsorption. However, the low surface negative charge of the chitosan adsorbent affects its adsorption efficiency, and its inadequate mechanical properties hinder reusability. To address these issues, this study developed two composite membranes: the 3D wood imprinted carboxylated chitosan composite membrane (3DW-ICNTs/COOH/CS) and the 3D wood carboxylated chitosan composite membrane (3DW-CNTs/COOH/CS) for the separation and recovery of rare earth Nd(III). Kinetic experimental results indicate that both composite membranes reached 80% of maximum adsorption capacity within 200 min, indicating the significant negative charge on the surface of the carboxylated carbon nanotube-modified chitosan material. Even after ten adsorption and desorption cycles, imprinted composite membranes maintained a removal rate of about 80%. The utilizing delignified wood as a support material preserved the mechanical properties of the composite membrane, thereby providing a favorable condition for its industrial application.
研究领域:
材料科学
·
环境工程
·
化学工程
·
高分子科学
·
纳米技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Minghao Sun,Haoxiang Zhong,Shuren Jiao,Hanqi Shao,Lingzhi Zhang
Carboxymethyl chitosan (C-CTS) was firstly reported as a water soluble binder for LiFePO 4 cathode in Li-ion batteries. The electrochemical performances of LiFePO 4 cathode with C-CTS binder was investigated and compared with the conventional water-soluble sodium carboxymethyl cellulose (CMC) and the commercial non-aqueous polyvinylidene difluoride (PVDF). LiFePO 4 cathode with C-CTS exhibited a comparable cycling performance, but better rate capability than that of CMC and PVDF, retaining 65% capacity of C/5 at 5 C rate as compared with 55.9% and 39.4% for CMC and PVDF, respectively. In addition, LiFePO 4 cathode with C-CTS exhibited excellent cycling performance at 60 °C, retaining 91.8%/62.1% capacity after 80 cycles at 1 C/10 C, respectively.
研究领域:
材料科学
·
电化学
·
能源存储
·
高分子化学
·
电池技术
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2019
·Vol. 12
·期 4
·858-865
·
IF 7.804
Xinxin Li,Qingshan Zhao,Xiang Feng,Lei Pan,Zhuangzhuang Wu,Xiaocui Wu,Tianwen Ma,Jialiang Liu,Yuanyuan Pan,Yan Song,Mingbo Wu
Graphical Nitrogen-doped graphene nanoshells supporting palladium nanoparticles (Pd/N-GNS) have been developed as a superior catalyst for the N -allylation reaction. Experimental results and DFT calculations reveal strong metal–support interactions between the pyridinic N and palladium species, which significantly boost the catalytic efficiency and stability of the catalyst. In this study, nitrogen-doped graphene nanoshells (N-GNS) were developed to support palladium nanoparticles (Pd/N-GNS) as an efficient and recyclable catalyst for the N -allylation reaction. N-GNS was synthesized through a facile hard-template method by using petroleum asphalt, followed by nitrogen doping by thermal annealing with urea, the contents and species of which could be altered by the calcination temperature. Palladium nanoparticles (Pd NPs) with an average diameter of 3.3 nm were homogeneously deposited onto the N-GNS support through a mild solvent-growth approach. The Pd/N-GNS exhibited a superior activity towards the N -allylation reaction, 6-fold higher than that of the pristine graphene nanoshells supporting the palladium catalyst. The Pd/N-GNS could be recycled several times without activity deterioration and metal leaching. The catalytic activity showed a linear correlation relationship with the pyridinic N content. Experimental and theoretical studies reveal strong metal–support interactions between the pyridinic N and palladium species, which can downsize the Pd NPs, modulate the electronic properties, and promote the adsorption of reactant, thereby significantly boosting the catalytic efficiency and stability for the N -allylation process. The present work could help unravel the roles of nitrogen-doped carbon supports and provides a feasible strategy to rationally design superior palladium catalysts for chemical transformations.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
KINETICS AND CATALYSIS
·
2013
·Vol. 54
·期 6
·716-723
·
IF 0.543
Zeng Minfeng,Sun Xudong,Qi Chenze,Zhang Xian-Man
A novel and environmentally friendly heterogeneous catalyst has been prepared through the wet impregnation of copper(I) species onto the highly porous chitosan microspheres (CuI/PCMS). This novel CuI/PCMS heterogeneous catalyst with no additional ligands is much better than CuI homogeneous catalysts when applied in Heck reactions. Moreover, the reaction conditions are much milder than those for the similar copper catalysts mediated cross-coupling reactions reported in the literature. PCMS has been demonstrated not only the excellent solid support, but also have many unique functional groups to chelate the copper (I) species to enhance its catalytic activity.
研究领域:
催化化学
·
有机合成
·
材料化学
·
环境友好化学
·
功能高分子材料
✓ 已验证
DOI
高影响因子
Small
·
2019
·Vol. 15
·期 7
·1804974
·
IF 10.856
Na Li,Pingping Wei,Linan Yu,Junyi Ji,Jiupeng Zhao,Chuanbo Gao,Yao Li,Yadong Yin
The dynamic optical switch of plasmonic nanostructures is highly desirable due to its promising applications in many smart optical devices. To address the challenges in the reversibility and transmittance contrast of the plasmonic electrochromic devices, here, a strategy is reported to fabricate color switchable electrochromic films through electro-responsive dissolution and deposition of Ag on predefined hollow shells of Au/Ag alloy. Using the hollow Au/Ag alloy nanostructures as stable seeds for site-specific deposition of Ag, elimination of the random self-nucleation events is enabled and optimal reversibility in color switching is allowed. The hollow structure further enables excellent transmittance contrast between the bleached and colored states. With its additional advantages such as the convenience for preparation, high sensitivity, and field-tunable optical property, it is believed that this new electrochromic film represents a unique platform for designing novel smart optical devices.
研究领域:
材料科学
·
纳米科技
·
光学工程
·
功能材料
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 34
·13859-13867
·
IF 0
Chengxin Peng,Huixin Chen,Qiongyu Li,Weiwei Cai,Qin Yao,Qingsheng Wu,Jinhu Yang,Yong Yang
The silicon material is the most promising candidate for developing new-generation lithium-ion batteries with high energy and power output. However, there remains a significant challenge due to poor electrical conductivity and pulverization of the silicon based anode during cycles. Aiming to solve these problems, in this work we fabricate a novel 3D composite architecture made of a Si@SiOx core–shell nanowire array grown on a 3D graphitic foam (Si CNW–3D GF) substrate by a well-designed multiple-step approach. The prepared Si CNW–3D GF composite shows the integrated advantages for high-performance lithium ion batteries, including its light weight, open macroporosity, high conductivity, high Si NW loading, excellent flexibility as well as SiOx buffer layers. As a result, the Si CNW–3D GF composite exhibits excellent performance such as high reversible lithium storage capacity (3603 mA h g−1 at a current density of 840 mA g−1), excellent cycling performance (up to 100 cycles) and superior rate capability (2299 mA h g−1 at 4200 mA g−1 and 1206 mA h g−1 at 8400 mA g−1), which is 2 times that of the Si CNW electrode where Si CNWs were grown directly on a stainless steel current collector without the presence of 3D GF.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
功能材料
·
电池技术
✓ 已验证
DOI
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2015
·Vol. 26
·期 6
·4062-4068
·
IF 1.569
Cheng Tao,Li Dongmei,Li Jie,Ren Bing,Wang Gang,Cheng Jingwei
High fluorescence ZnTe quantum dots (QDs) were prepared by one-step aqueous method in faintly acid solution. The detailed microstructure and morphology of the prepared ZnTe QDs has been characterized by X-ray powder diffraction and high resolution transmission electron microscopy, respectively. The average size of as-prepared ZnTe QDs is about 5 nm, which is hexagonal wurtzite structure. The PL spectra consists of a strong peak around 550 nm originating from surface state emission and a weak peak around 470 nm via band edge emission. Meanwhile, ZnTe/ZnSe QDs were prepared by passivating ZnSe shell on surface of ZnTe core, which effectively prevent the Tellurium ion oxidation to reduce the zinc carrier trap and the emission peak at about 470 nm has been strengthened. ZnTe/ZnSe QDs show a higher quantum yield (21.90 %) than ZnTe QDs (10.19 %). Moreover, ZnTe/ZnSe QDs exhibit excellent stability against time.
研究领域:
材料科学
·
纳米技术
·
半导体物理
·
光电子学
·
胶体化学
·
荧光材料
·
量子点合成
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2017
·
IF 3.012
Yinxiu Zuo,Jingkun Xu,Fengxing Jiang,Xuemin Duan,Limin Lu,Huakun Xing,Taotao Yang,Youshan Zhang,Guo Ye,Yongfang Yu
A sensitive Pb(II) sensor was fabricated based on Co 3 O 4 /reduced graphene oxide/chitosan (Co 3 O 4 /rGO/chitosan) nanocomposite modified glassy carbon electrode (GCE). The Co 3 O 4 /rGO material was synthesized through in situ growth of Co 3 O 4 nanoparticles (NPs) on GO and subsequent hydrazine reduction process. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) show that Co 3 O 4 NPs with a diameter of around 100 nm are attached on rGO sheets. The structures and compositions of Co 3 O 4 /rGO were further characterized by X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). Many experimental parameters, such as pH value, deposition time and deposition potential were optimized. Under optimal conditions, the calibration plot for Pb(II), with data acquired at − 0.556 V ( vs . SCE) is linear in the concentration range from 1.0 to 200.0 nM. Combining the good conductivity and high surface area of rGO, strong Pb(II) adsorption ability of Co 3 O 4 NPs, and excellent Pb(II) complex-forming ability of chitosan, the nanocompsite provides a sensitive Pb(II) senor with a detection limit of 0.35 nM. Moreover, the positively charged chitosan can interact with the negatively charged rGO to increase the stability of Co 3 O 4 /rGO nanocomposite. The hybrid nanocomposite Pb(II) senor provides new opportunity for vegetable analysis.
研究领域:
分析化学
·
环境监测
·
电化学传感
·
纳米材料
·
食品安全
·
重金属毒理学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2018
·
IF 4.7
Ming Zhong,Wei-Wei He,Wei Shuang,Ying-Ying Liu,Tong-Liang Hu,Xian-He Bu
Metal–organic frameworks (MOFs) with diverse structures, adjustable pore sizes, and high surface areas have exhibited awesome potential in many fields. Here we report a simple carbonization strategy to obtain a series of core–shell structured Co/Co3O4 nanoparticles encapsulated into nitrogen-doped carbon shells from cobalt-based metal–organic framework precursors at different carbonization temperatures. When it is applied as an anodes for lithium ion batteries, the Co/Co3O4@N-C-700 electrode delivers a maximum initial discharge capacity of 1535 mAh g–1, the highest reversible capacity (903 mAh g–1 at a current density of 100 mA g–1 after 100 cycles), and the best rate performance (i.e., 774 mAh g–1 at a current density of 1.0 A g–1 after 100 cycles) in comparison with those of Co/Co3O4@N-C-600 and Co/Co3O4@N-C-800 electrodes. The excellent electrochemical performance could be mainly attributed to the unique core–shell structure, abundant graphited carbon, and the well-dispersed Co/Co3O4 nanoparticles which can promote the specific capacity through conversion reactions.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
Energy Storage Materials
·
2018
·
IF 0
Niantao Liu,Jing Liu,Dianzeng Jia,Yudai Huang,Jun Luo,Xamxikamar Mamat,Yan Yu,Yemin Dong,Guangzhi Hu
Various techniques have been developed to mitigate the volume expansion of silicon-based materials and improve their conductivity in lithium ion batteries (LIBs). Here, we have synthesized a novel cobalt and nitrogen co-doped double carbon coated silicon/carbon/metal-organic framework (MOF) multi-core yolk-shell like mesoporous materials through sol-gel and MOF self-template methods. The structure and morphology of the sample was characterized by X-ray diffraction and electron microscopy . The results show that the prepared composite is made up of multiple phenolic resin-based carbon-coated silicon embedded in MOF-derived carbon framework. The composite exhibits excellent lithium storage performance with a reversible capacity of 1107 mA h g −1 at 0.5 A g −1 after 100 cycles and cycling stability capacity of 852 mA h g −1 at a current density of 1 A g −1 over 300 cycles. The improved electrochemical performance could be attributed to double carbon coated multi-core yolk-shell mesoporous structure in conjunction with cobalt and nitrogen co-doping, which can improve electrical conductivity and the cycle performance of silicon. Moreover, as the electrolyte blocking layer, the double-layer carbon coating is beneficial to the formation of stable solid electrolyte interphase films, and empty space inside the MOF-derived carbon multi-core yolk-shell structure can effectively mitigate the volume change of silicon during the lithiation/delithiation process.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
功能材料
✓ 已验证
DOI
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Lingzhi Guo,Hongyan He,Yurong Ren,Chao Wang,Mingqi Li
Core-shell F-doped carbon coated SiO composites with interspaces and some small voids (SiO@F-doped C) are successfully fabricated using bulk SiO as starting material. With the assistance of polytetrafluoroethylene (PTFE), both etching and carbon coating of SiO are firstly performed in a single step, which largely lowers the production cost of materials. The SiO@F-doped C composite obtained by annealing the mixture of SiO and PTFE with a mass ratio of 5:3 at 650 °C shows the highest stable discharge capacity with excellent cycling stability. It delivers a stable discharge capacity of about 975 mAh g −1 at a current density of 100 mA g −1 . Even after the current density increases to 1600 mA g −1 , a stable discharge capacity of about 553 mAh g −1 can be achieved. At a current density of 400 mA g −1 , the composite maintains a discharge capacity of 752 mAh g −1 after 350 cycles, the retention of which is 99.2% versus that in the second cycle. Compared with the annealed SiO, in addition to higher conductivity, the ions diffusion rate of the SiO@F-doped C composite increases 2.94 times while the volume expansion falls by more than half, which should be responsible for its significantly enhanced electrochemical performance.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）