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Dive into the research topics where Meng Shang is active.

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Featured researches published by Meng Shang.


Chemistry: A European Journal | 2009

Bi2O3 Hierarchical Nanostructures: Controllable Synthesis, Growth Mechanism, and their Application in Photocatalysis

Lin Zhou; Wenzhong Wang; Haolan Xu; Songmei Sun; Meng Shang

By introducing VO(3)(-) into the reaction system, uniform hierarchical nanostructures of Bi(2)O(3) have been successfully synthesized by a template-free aqueous method at 60-80 degrees C for 6 h. The as-prepared hierarchitectures are composed of 2D nanosheets, which intercross with each other. Based on the electron microscope observations, the growth of such hierarchitectures has been proposed as an Ostwald ripening process followed by self-assembly. The nucleation, growth, and self-assembly of Bi(2)O(3) nanosheets could be readily tuned, which brought different morphologies and microstructures to the final products. Pore-size distribution analysis revealed that both mesopores and macropores existed in the product. UV-vis spectroscopy was employed to estimate the band gap energies of the hierarchical nanostructures. The photocatalytic activities of as-prepared Bi(2)O(3) hierarchitectures were 6-10 times higher than that of the commercial sample, which was evaluated by the degradation of RhB dye under visible light irradiation (lambda>420 nm).


Journal of Hazardous Materials | 2009

Preparation of BiOBr lamellar structure with high photocatalytic activity by CTAB as Br source and template.

Meng Shang; Wenzhong Wang; Ling Zhang

Visible-light-induced photocatalyst BiOBr has been synthesized by a hydrothermal method, in which cetyltrimethylammonium bromide (CTAB) acted not only as the template but also the Br source. A possible formation mechanism of BiOBr lamellar structure with the assistance of CTAB under hydrothermal condition was proposed. The photocatalytic activities were evaluated by the degradation of methyl orange (MO) at pH 4.5 under visible-light irradiation (lambda>420 nm). The lamellar BiOBr prepared in 100mL CTAB solution with the molar ratio of CTAB/Bi(NO(3))(3) (R)=2:1 at the hydrothermal temperature of 160 degrees C for 24h exhibited excellent visible-light-driven photocatalytic efficiency, which was up to 96% within 120 min. This was about four times higher than that of the BiOBr synthesized by KBr. After five recycles, the catalyst did not exhibit any significant loss of photocatalytic activity, confirming the photocatalyst is essentially stable. Close investigation revealed that the size, the band gap, and the structure of as-prepared BiOBr affected the photocatalytic activities.


Science | 2015

Readily processed protonic ceramic fuel cells with high performance at low temperatures

Chuancheng Duan; Jianhua Tong; Meng Shang; Stefan Nikodemski; Michael D. Sanders; Sandrine Ricote; Ali Almansoori; Ryan O’Hayre

Cooler ceramic fuel cells Ceramic ion conductors can be used as electrolytes in fuel cells using natural gas. One drawback of such solid-oxide fuel cells that conduct oxygen ions is their high operating temperatures (at least 600°C). Duan et al. have made a proton-conducting ceramic fuel cell with a modified cathode material that exhibits high performance on methane fuel at 500°C (see the Perspective by Gorte). Science, this issue p. 1321; see also p. 1290 A proton-conduction cathode and simpler fabrication enable lower-temperature operation of methane-fueled ceramic fuel cells. [Also see Perspective by Gorte] Because of the generally lower activation energy associated with proton conduction in oxides compared to oxygen ion conduction, protonic ceramic fuel cells (PCFCs) should be able to operate at lower temperatures than solid oxide fuel cells (250° to 550°C versus ≥600°C) on hydrogen and hydrocarbon fuels if fabrication challenges and suitable cathodes can be developed. We fabricated the complete sandwich structure of PCFCs directly from raw precursor oxides with only one moderate-temperature processing step through the use of sintering agents such as copper oxide. We also developed a proton-, oxygen-ion–, and electron-hole–conducting PCFC-compatible cathode material, BaCo0.4Fe0.4Zr0.1Y0.1O3-δ (BCFZY0.1), that greatly improved oxygen reduction reaction kinetics at intermediate to low temperatures. We demonstrated high performance from five different types of PCFC button cells without degradation after 1400 hours. Power densities as high as 455 milliwatts per square centimeter at 500°C on H2 and 142 milliwatts per square centimeter on CH4 were achieved, and operation was possible even at 350°C.


Journal of Hazardous Materials | 2010

Low-temperature combustion synthesis of Bi2WO6 nanoparticles as a visible-light-driven photocatalyst.

Zhijie Zhang; Wenzhong Wang; Meng Shang; Wenzong Yin

Visible-light-induced Bi(2)WO(6) photocatalyst has been successfully synthesized via a facile low-temperature combustion synthesis method, using glycine as the fuel. The photocatalytic activities of the as-synthesized samples were evaluated by the photodegradation of rhodamine B (RhB) and phenol under visible-light irradiation (lambda>420 nm). The results showed that the molar ratio of fuel to oxidizer had an important influence on the photocatalytic activities of the products. When the molar ratio of fuel to oxidizer was 1, the photocatalyst exhibited the highest degradation efficiency, which can completely degrade RhB with a concentration up to 10(-4)M within 75 min. Besides decoloring, the markable reduction of chemical oxygen demand (COD) was also observed in the degradation of RhB, further demonstrating the photocatalytic performance of Bi(2)WO(6). Additionally, the photocatalyst showed much enhanced visible photocatalytic efficiency, up to 94.2% in 4h, than the bulk Bi(2)WO(6) powder (SSR) in the degradation of phenol.


Journal of Hazardous Materials | 2009

Nanosized BiVO4 with high visible-light-induced photocatalytic activity: Ultrasonic-assisted synthesis and protective effect of surfactant

Meng Shang; Wenzhong Wang; Lin Zhou; Songmei Sun; Wenzong Yin

Nanosized BiVO4 with high visible-light-induced photocatalytic activity was successfully synthesized via ultrasonic-assisted method with polyethylene glycol (PEG). The BiVO4 sample prepared under ultrasonic irradiation with 1g PEG for 30 min was consisted of small nanoparticles with the size of ca. 60 nm. The effects of ultrasonic irradiation and surfactant were investigated. The nanosized BiVO4 exhibited excellent visible-light-driven photocatalytic efficiency for degrading organic dye, which was increased to nearly 12 times than that of the products prepared by traditional solid-state reaction. Besides decoloring, the reduction of chemical oxygen demand (COD) concentration was also observed in the degradation of organic dye, further demonstrating the photocatalytic performance of BiVO4. After five recycles, the catalyst did not exhibit any significant loss of photocatalytic activity, confirming the photocatalyst is essentially stable. Close investigation revealed that the crystal size, BET surface area, and appropriate band gap of the as-prepared BiVO4 could improve the photocatalytic activities.


Journal of Hazardous Materials | 2010

Preparation of ordered mesoporous Ag/WO3 and its highly efficient degradation of acetaldehyde under visible-light irradiation.

Songmei Sun; Wenzhong Wang; Shaozhong Zeng; Meng Shang; Ling Zhang

A highly active photocatalyst, silver loaded mesoporous WO(3), was successfully synthesized by an ultrasound assisted insertion method. The photodegradation of a common air pollutant acetaldehyde was adopted to evaluate the photocatalytic performance of the as-prepared sample under visible-light irradiation. The photocatalytic activity was about three and six times higher than that of pure mesoporous WO(3) and nitrogen-doped TiO(2), respectively. The photocatalytic mechanism was investigated to understand the much enhanced photocatalytic activity, which was mainly attributed to the largely improved electron-hole separation in the Ag-WO(3) heterojunction.


ACS Applied Materials & Interfaces | 2011

Heterostructured bismuth molybdate composite: preparation and improved photocatalytic activity under visible-light irradiation.

Jia Ren; Wenzhong Wang; Meng Shang; Songmei Sun; Erping Gao

A heterostructured photocatalyst containing the same Bi, Mo, and O elements (Bi(3.64)Mo(0.36)O(6.55)/Bi(2)MoO(6)) was realized by a facile hydrothermal method. The heterostructured composite was characterized by powder X-ray diffraction, selected-area electron diffraction, scanning electron microscopy, and high-resolution electron microscopy. The Bi(3.64)Mo(0.36)O(6.55)/Bi(2)MoO(6) composite exhibited notable enhanced photocatalytic activity compared to Bi(2)MoO(6) or Bi(3.64)Mo(0.36)O(6.55) in the photocatalytic degradation of rhodamine B and phenol under visible-light irradiation. More interestingly, it is found that the heterostructured composite could mineralize organic substances into CO(2) efficiently. This study offered a clue for the design of an efficient photocatalyst in the application of environmental treatment.


CrystEngComm | 2010

A novel BiVO4 hierarchical nanostructure: controllable synthesis, growth mechanism, and application in photocatalysis

Meng Shang; Wenzhong Wang; Jia Ren; Songmei Sun; Ling Zhang

A novel BiVO4 hierarchical nanostructure assembled by nanorods was realized via a facile and additive-free solvothermal method. Based on the electron microscope observations, the growth of such architectures with “rod to dumbbell to sphere” transformation has been proposed as a crystal splitting growth process. Ethylene glycol (EG) instead of organic surfactant played an important dual role during the process. Different shapes were obtained by controlling the synthetic parameters. The as-prepared BiVO4 hierarchical nanostructures exhibited excellent visible-light-driven photocatalytic efficiency, which was increased to nearly 20 times than that of the products prepared by traditional solid-state reaction (SSR) and the nitrogen doped TiO2 (N–TiO2). Moreover, the photocatalyst could settle immediately, which is beneficial for the separation and recycle considering their future applications in waste water treatment.


Journal of Materials Chemistry | 2009

A practical visible-light-driven Bi2WO6 nanofibrous mat prepared by electrospinning

Meng Shang; Wenzhong Wang; Jia Ren; Songmei Sun; Lu Wang; Ling Zhang

An electrospinning technique was first developed to fabricate Bi2WO6 nanofibrous mat with excellent photoactivity under visible light. The nanofibers are made of single-crystalline Bi2WO6nanoparticles about 100 nm in size. The diameters of the nanofibers can be controlled by simply tuning the weight ratio of Bi2WO6 to poly(vinyl pyrrolidone) (PVP) (R). With the value of R increasing, the average diameter of the nanofibers was decreased. In addition to the favorable recycling characteristics, the mat with R = 2 exhibits higher photocatalytic activity in the decomposition of acetaldehyde (CH3CHO) and aqueous ammonia than that of the sample prepared by solid-state reaction (SSR) and the nanoparticles. Such an advantageous electrospinning route, which not only brings effective improvement in the photocatalytic activity of catalysts but also provides a solution to the separation problem for conventional catalysts that are small in size, is worth considering for the preparation of other photocatalysts.


Journal of Hazardous Materials | 2011

Enhanced photocatalytic activity of Bi2WO6 with oxygen vacancies by zirconium doping

Zhijie Zhang; Wenzhong Wang; Erping Gao; Meng Shang; Jiehui Xu

To overcome the drawback of low photocatalytic efficiency brought by electron-hole recombination, Bi(2)WO(6) photocatalysts with oxygen vacancies were synthesized by zirconium doping. The oxygen vacancies as the positive charge centers can trap the electron easily, thus inhibiting the recombination of charge carriers and prolonging the lifetime of electron. Moreover, the formation of oxygen vacancies favors the adsorption of O(2) on the semiconductor surface, thus facilitating the reduction of O(2) by the trapped electrons to generate superoxide radicals, which play a key role in the oxidation of organics. Visible-light-induced photodegradation of rhodamine B (RhB) and phenol were carried out to evaluate the photoactivity of the products. The results showed that oxygen-deficient Bi(2)WO(6) exhibited much enhanced photoactivity than the Bi(2)WO(6) photocatalyst free of oxygen deficiency. This work provided a new concept for rational design and development of high-performance photocatalysts.

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Wenzhong Wang

Chinese Academy of Sciences

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Songmei Sun

Chinese Academy of Sciences

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Ling Zhang

Chinese Academy of Sciences

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Jia Ren

Chinese Academy of Sciences

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Wenzong Yin

Chinese Academy of Sciences

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Lin Zhou

Chinese Academy of Sciences

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Lu Wang

Chinese Academy of Sciences

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Zhijie Zhang

Shanghai Institute of Technology

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Jianhua Tong

Colorado School of Mines

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Ryan O'Hayre

Colorado School of Mines

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