MATERIALS CHEMISTRY AND PHYSICS
·
2013
·
IF 2.072
De-Kun Ma,Shu-Mei Zhou,Xia Hu,Qiao-Rong Jiang,Shao-Ming Huang
We present here a facile one-pot surfactant-free solvothermal route to synthesize hierarchical BiOI microspheres assembled from nanosheets at 120 °C for 16 h. The as-synthesized BiOI microspheres could be topochemically converted into hollow hierarchical Bi 2 WO 6 ones built by nanoplates for the first time under hydrothermal condition because of the analogies of crystal structures. The transformation process of hierarchical BiOI microspheres to hollow Bi 2 WO 6 ones was surveyed through XRD analyses and FE-SEM observations of the intermediates at different reaction stages. Rhodamine B (RhB) was selected as pollutant model and visible-light-driven photocatalytic activities of hierarchical BiOI and Bi 2 WO 6 microspheres under the same measurement conditions were comparatively studied. As a result, the photocatalytic activities of BiOI obviously outshone Bi 2 WO 6 . The present study not only develops a new method for fabricating hierarchical architectures but also provides some useful information on relative visible-light-responding photocatalytic activity of hierarchical BiOI and Bi 2 WO 6 microspheres.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Discover Nano
·
2024
·Vol. 19
·期 1
·1-8
·
IF 0
Xiong Yuanpeng,Wu Bo,Lin Yuanzhi,Zhang Mingwen,Chen Jintian
In this study, a simple route for the synthesis of hierarchical W 18 O 49 assembled by nanowires is reported. The morphologies and formation of W 18 O 49 single-crystal could be controlled by changing the concentration of WCl 6 -ethanol solution. This synthesis strategy has the advantages that the hierarchical W 18 O 49 microspheres could be economic synthesized at 180 °C without adding additives. Furthermore, efficient optical absorption properties in ultraviolet, visible and near-infrared region were obtained for the hierarchical W 18 O 49 microspheres comparing with nanowires. These results will further promote the research of tungsten-based oxide nanomaterials. Graphical abstract
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
RSC Advances
·
2020
·Vol. 10
·期 19
·11182-11187
·
IF 3.119
Yong Li,Jiyang Xie,Changjin Guo,Jian Wang,Huan Liu,Wanbiao Hu
Sodium titanate nanowire-assembled microspheres on titanium mesh have been synthesized through controlling an over the surface acidification and hydrothermal process in terms of a proposed in situ “nucleation-cum-growth” solution chemistry strategy. These directly grown microspheres crystallize in an orthorhombic lepidocrocite layered structure of sodium titanate with the composition of Na1.8Ti1.95□0.05O4.8 (□ ∼ vacancy) determined by the XRD, Raman and SEM-EDX techniques. An individual microsphere has a uniform size of around 10 microns while the constituent nanowires have a diameter of 100 nm growing along the [110] orientation. Owing to the specially well-defined hierarchical structure and robust in situ interfaces, these titanate nanowire-assembled microspheres, after 2,2,3,3,4,4,5,5-octafluoro-1-pentanol (OFP) surface modification, could achieve superhydrophobicity. This work demonstrates an in situ “nucleation-cum-growth” synthesis strategy and facile functionalization towards superhydrophobicity for oil–water separation, which might extend to a broad variety of oxide nanowire systems to fabricate well-defined structures for wettability tailoring and multi-functional applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2017
·Vol. 33
·期 6
·965-970
·
IF 1.024
Liu Shankui,Liu Pengcheng,Niu Ruyue,Wang Shuang,Li Jinping
Flower-like Co 3 O 4 hierarchical microspheres composed of self-assembled porous nanoplates were prepared by employing Pluronic F127 block-copolymer as template. The samples were characterized by powder X-ray diffraction(PXRD), scanning/transmission electron microscopy(SEM/TEM), and nitrogen adsorption-desorption at 77 K. The results show that the catalytic activity of Co 3 O 4 nanoflowers for the combustion of ventilation air methane is higher than that of commercial Co 3 O 4 . The superior catalytic performance of this material can be related to its dominantly exposed {112} crystal planes and higher content of surface Co 3+ .
研究领域:
材料科学
·
环境催化
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2019
·Vol. 12
·期 19
·4412-4420
·
IF 7.804
Da Li,Wei Zhao,Lei Cao,Yiying Gao,Yahui Liu,Weijing Wang,Tao Qi
Graphical In the mix : A mixed-surfactant-assisted synthesis of dual-phase Li 4 Ti 5 O 12 -TiO 2 hierarchical microspheres is proposed. The ratio of anionic/cationic surfactant regulates the dual-phase ratio and primary structure morphology of the final product. The optimal sample obtained has a better electrochemical performance than similar state-of-the-art materials. A mixed-surfactant-assisted method was developed to synthesize dual-phase Li 4 Ti 5 O 12 -TiO 2 hierarchical microspheres. The ratio of anionic/cationic surfactant could regulate the primary structure morphology and the dual-phase ratio of the final product, in which the primary structure morphology could be stacked nanosheets, small nanoparticles, or large nanoparticles. The sample with a primary structure morphology of small nanoparticles had the highest specific surface area of 79.38 m 2 g −1 and the best electrochemical performance because of its high Li + migration rate, low polarization, and appropriate TiO 2 content. Its capacity reached 153.5 mA h g −1 at a current rate of 40 C, and it retained nearly 100 % of its capacity after 100 cycles. A self-assembly mechanism of the mixed surfactant was highlighted to explain the formation of hierarchical microspheres. The physical and electrochemical properties of obtained material were correlated effectively.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Ai-Min Yang,Yang Han,Shan-Shan Li,Hong-Wei Xing,Yu-Hang Pan,Wei-Xing Liu
Bi 2 WO 6 nanofibers and hierarchical microspheres were synthesized by an electrospinning process and a hydrothermal method . The phase, microstructure and photocatalytic performance of the obtained Bi 2 WO 6 photocatalysts were investigated. The X-ray powder diffraction and Fourier transform infrared spectroscopy suggest that Bi 2 WO 6 nanofibers and hierarchical microspheres have the single orthorhombic phase. The scanning electron microscope and transmission electron microscope images show that Bi 2 WO 6 nanofibers are composed of nanoparticles and Bi 2 WO 6 hierarchical microspheres consist of a large number of nanosheets . The Barrett−Emmett−Teller results, X-ray photoelectron spectroscopy, ultraviolet–visible diffuse reflectance spectra, emission spectra, photocurrent and electrochemical impedance spectroscopy reveal that Bi 2 WO 6 hierarchical microspheres have a higher photocatalytic activity than that of Bi 2 WO 6 nanofibers. This is confirmed by the photo decomposition of Rhodamine B under light irradiation. The Bi 2 WO 6 hierarchical microspheres show a faster and higher efficiency decomposition of Rhodamine B under light irradiation. The higher photocatalytic activity of Bi 2 WO 6 hierarchical microspheres results from the larger specific surface area. The large specific surface area provides more surface active sits and makes an easier charge carrier transport.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2014
·
IF 6.007
Ruiping Hu,Xin Xiao,Shunheng Tu,Xiaoxi Zuo,Junmin Nan
Novel flower-like heterostructured β-Bi 2 O 3 /Bi 2 O 2 CO 3 microspheres are synthesized by calcining a Bi 2 O 2 CO 3 self-sacrifice precursor for the visible-light photocatalytic degradation of o -phenylphenol (OPP, is a widely used fungicide and preservative agent). The Bi 2 O 2 CO 3 microspheres are firstly prepared under hydrothermal conditions, and then converted to Bi 2 O 3 by thermal treatment. With increasing the calcining temperature from 250 to 500 °C, an in situ stepwise decomposition reaction take place during the course of calcination , described as: Bi 2 O 2 CO 3 → β-Bi 2 O 3 /Bi 2 O 2 CO 3 → β-Bi 2 O 3 → β-Bi 2 O 3 /α-Bi 2 O 3 → α-Bi 2 O 3 . The β-Bi 2 O 3 /Bi 2 O 2 CO 3 microspheres synthesized at 300 °C exhibit excellent photocatalytic activity under visible-light irradiation, which can degrade 99.8% OPP in 45 min. And the degradation rate of the heterostructured photocatalyst is approximately 2, 2.6, 6, 13, 80, and 827 times higher than that of single β-Bi 2 O 3 , mixed β-Bi 2 O 3 and Bi 2 O 2 CO 3 , commercial β-Bi 2 O 3 , α-Bi 2 O 3 , N-doped TiO 2 , and Bi 2 O 2 CO 3 , respectively. The superior photoreactivity of the β-Bi 2 O 3 /Bi 2 O 2 CO 3 is attributed to the enhanced charge separation and transfer due to the formation of p–n junction with large heterojunction interface, favorable band gap energy (2.27 eV), relatively high specific surface areas (12.5 m 2 g −1 ), and flower-like hierarchical micro/nano structures. In addition, the degradation intermediates including ethyl phenethyl ether, phenyl acetaldehyde, and phenylacetic acid are identified. And the results also reveal that the photogenerated holes and •O 2 − radicals are primarily reactive species in the photocatalytic system, which are the key factors responsible for the nearly complete mineralization of OPP.
研究领域:
材料科学
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环境科学
·
光催化
✓ 已验证
DOI
高影响因子
Particuology
·
2021
·
IF 3.067
Ruijuan Lv,Xinming Zhang,Ruimeng Sun,Lixia Chen,Yang Zhang,Rongtian Sheng,Ting Du,Yuhan Li,Yanfei Qi
Hybrid composite materials with hierarchical structures have attracted continuing attention for their enhanced features and various applications. The new hybrid composites XW 9 @PDA (XW 9 means Na 8 H[α-PW 9 O 34 ], Na 10 [α-SiW 9 O 34 ] and Na 10 [α-GeW 9 O 34 ]; PDA means polydopamine) have been synthesized for potential sensing applications. The effect of polyoxometalates on the formation of the hybrid composites was investigated. Scanning electron microscopy (SEM) supported the obtained XW 9 @PDA were hierarchical microsphere . By monitoring the reaction of classical peroxidase substrate o-phenylenediamine (OPD) to form yellow 2, 3-diaminophenazine (DAB) in the presence of H 2 O 2 , the peroxidase-like activity of XW 9 @PDA was calculated. The results showed that XW 9 @PDA still keep the peroxidase-like activity and have 505.98%, 208.58% and 582.78% enhancement in intrinsic catalytic activity for PW 9 @PDA, SiW 9 @PDA and GeW 9 @PDA. Among the three composites, PW 9 @PDA showed the highest peroxidase-like activity. Therefore, PW 9 @PDA was applicable to the colorimetric and electrochemical sensing for H 2 O 2 .
研究领域:
材料科学
·
生物化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 55
·35905-35922
·
IF 4.036
Liyan Wang,Zhiqiang Miao,Fei Bi,Shanshan Xiao,Li Zhao,Yongtao Li,Lingwei Kong,Yingqi Li,Jingxiu Yang,Xuejian Zhang,Guangqing Gai
BiOCl hierarchical microspheres assembled from nanosheets with exposed {001} facets were successfully synthesized using PEG-2000 as template by a one-pot room-temperature hydrolysis method. The PEG-modified BiOCl photocatalyst exhibits a significantly enhanced RhB photosensitized degradation activity under visible light. After 10 min white LED irradiation, the degradation efficiency of RhB by the PEG-modified BiOCl sample S0.07 reaches 99.5%. The degradation rate constant of the PEG-modified sample S0.07 over RhB is 0.4568 min−1, which is 6.76 times that of the unmodified sample S0 (0.0676 min−1). After 4 min of xenon lamp (λ ≥ 420 nm) irradiation, the degradation rate of RhB by S0.07 is almost 100%. The exposed {001} facets with surface defects contribute to the superior adsorption capacity of BiOCl towards RhB, which immensely accelerates the electron transfer efficiency from the excited RhB into the conduction band of BiOCl, forming superoxide radical (˙O2−) active species to degrade the pollutants. Moreover, the superior RhB-sensitized BiOCl system provides high photocatalytic degradation activity over MO. This work provides a facile and efficient BiOCl synthesis method that is conducive to large-scale production and simultaneously opens up new ideas for the synthesis of other photocatalysts.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Jiahong Zheng,Yuhan Wang
In order to break the impasse of limited energy storage capacity in supercapacitors, it is essential to develop advanced electrode materials. In this work, a method for the construction of hierarchical Co x Ni 1-x S 2 microspheres based on MOF template derivatization strategy is proposed, with morphology control achieved through an in-situ solid-state sulfurization reaction. NiCo-LDH (NiCo layered double hydroxides) nanosheets were evenly grown on the surface of CoBTC (cobalt-benzene tricarboxylic acid based MOF) as a sacrificial template, and then sulfided to form Ni-Co sulfides with porous wrinkle structure, which effectively promoted the swift transfer of ions and electrons. Moreover, both of vulcanization temperature and sulfur source content were further systematically controlled to optimize the structure design and enhance electrochemical efficiency of the electrode materials. The as-prepared composites exhibit excellent specific capacitance (1 A·g −1 at 1243.69 F·g −1 ), along with reliable cycle stability, maintaining 90 % capacity after 1000 cycles, benefit from the synergistic effect between nickel and cobalt and the construction advantages of MOF-derived framework structures. The assembled ASC (asymmetric supercapacitor cell) device demonstrates an energy density of 38.19 Wh·kg −1 at a power density of 800 W·kg −1 and a cycle stability of 88 % after 1000 cycles. This approach offers a practical and efficient route to developing high-performance bimetallic sulfide electrode materials on a scalable level, demonstrating promising potential for widespread use in future energy storage technologies.
研究领域:
材料科学
·
电化学储能
·
纳米材料
·
能源化学
·
功能材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Jiuli Chang,Luyao Ma,Wenfang Liang,Fang Xu,Dapeng Wu,Kai Jiang,Yuming Guo,Zhiyong Gao
Bismuth (Bi) based compounds are promising negative materials in aqueous alkali batteries (AABs) for the 3-electron redox chemistry of Bi element within low potentials, the exploration of new Bi-based negative materials is still a meaningful work in this field. Herein, a hierarchical bismuthyl bromide (BiOBr) microspheres material assembled by laminas was prepared via solvothermal reaction and attempted as negative battery material for AAB. The pronounced redox reactions of Bi species in low potential enable high battery capacity, and the porous texture with high hydrophilicity facilitates diffusion of OH – and participation in faradaic reactions. When used as negative battery electrode, the BiOBr could offer decent specific capacity ( C s , 190 mAh g −1 at 1 A g −1 ), rate capability ( C s remained to 163 mAh g −1 at 8 A g −1 ) and cycleability (85% C s retention after 1000 charge–discharge cycles). The AAB based on BiOBr negative electrode could export an energy density ( E cell ) of 61.5 Wh kg −1 at power density ( P cell ) of 558 W kg −1 and good cycleability. The current work showcases valuable application expansion of a traditional BiOBr photocatalyst in battery typed charge storage.
研究领域:
材料科学
·
电化学
·
储能
·
无机化学
·
纳米技术
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Longqiang He,Xiaohua Wang,Dapeng Hong
Fe-doped BiOCl (Fe-BiOCl) hierarchical microspheres were successfully prepared by using a simple one-step solvothermal approach. The Fe-BiOCl hierarchical microspheres were analyzed by XRD, IR, SEM, XPS, TEM, etc. The analyses confirmed that impurity levels were successfully introduced into the band gap of BiOCl through Fe doping, leading to a decrease in the band gap and an expansion of the light absorption range to the visible region. Moreover, the separation and transfer of photogenerated carriers were more effectively promoted by Fe doping, resulting in a substantially elevated photocatalytic performance of BiOCl. After 40 min of dark adsorption and 60 min of photocatalysis, the removal efficiency of the prepared Fe-BiOCl-3 for methylene blue reached 93.5%, and the degradation reaction was accorded with a first-order kinetic law. After 5 cycles of photodegradation, Fe-BiOCl-3 still maintained its high photocatalytic ability, indicating that it had a certain degree of reusability. The active species capture experiment demonstrated that •O2– and •OH played a predominant role during the photocatalytic degradation process. Combined with the active species capture experiment, the photocatalytic degradation mechanism of Fe-BiOCl-3 was put forward.
研究领域:
材料科学
·
环境科学
·
催化
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）