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  • World Scientific Pub Co Pte Ltd  (4)
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  • World Scientific Pub Co Pte Ltd  (4)
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  • 1
    Online Resource
    Online Resource
    Hydrogen generation from the hydrolysis of sodium borohydride using TiO 2 supported Ru nanocatalysts prepared by photocatalytic reduction
    World Scientific Pub Co Pte Ltd ; 2018
    In:  Functional Materials Letters Vol. 11, No. 04 ( 2018-08), p. 1850079-
    Details
    In: Functional Materials Letters, World Scientific Pub Co Pte Ltd, Vol. 11, No. 04 ( 2018-08), p. 1850079-
    Abstract: The worldwide application of hydrogen energy greatly promotes the development of NaBH 4 hydrolysis for hydrogen production, particularly the study of hydrolysis catalysts. In this work, an anatase TiO 2 -supported ruthenium nanocatalysts (i.e., Ru/TiO 2 ) was facilely prepared by photocatalytic reduction without the use of any chemical reducing reagents. The Ru catalysts had an average particle size of approximately 2.2[Formula: see text]nm and were uniformly distributed. The Ru/TiO 2 was characterized by HRTEM, EDS, XRD, XPS and ICP-AES, respectively, and evaluated by classical water-displacement method. Using a 5[Formula: see text]wt.% NaBH[Formula: see text] [Formula: see text]wt.% NaOH solution, hydrogen generation (HG) rate was as high as 38.6[Formula: see text] L[Formula: see text]min[Formula: see text] [Formula: see text]g[Formula: see text] at 30 ∘ C, and apparent activation energy was calculated to be 55.9[Formula: see text]kJ[Formula: see text] mol[Formula: see text]. Compared with similar Ru-based catalysts reported in literature, the Ru/TiO 2 prepared in this work shows higher catalytic activity and lower apparent activation energy. After recycling for five times, the HG rate remained to be 91.7% of the initial level.
    Type of Medium: Online Resource
    ISSN: 1793-6047 , 1793-7213
    URL: Article
    DOI: 10.1142/S1793604718500790
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2018
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  • 2
    Online Resource
    Online Resource
    Electrodeposited Co–Zn on Ni foam as efficient catalysts for hydrogen generation from hydrolysis of sodium borohydride
    World Scientific Pub Co Pte Ltd ; 2017
    In:  Functional Materials Letters Vol. 10, No. 05 ( 2017-10), p. 1750065-
    Details
    In: Functional Materials Letters, World Scientific Pub Co Pte Ltd, Vol. 10, No. 05 ( 2017-10), p. 1750065-
    Abstract: For hydrogen generation based on the sodium borohydride hydrolysis, the development and application of efficient catalysts are of key importance. In this work, Co and Co–Zn catalysts were prepared on Ni foam by electrodeposition process. Field-emission scanning electron microscopy (FE-SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were employed for materials characterization, and catalyst performance was measured by typical water-displacement method. Experimental results indicate that the doping of zinc affects the morphology and microstructure of catalyst and promotes the effective catalytic area, leading to higher hydrogen generation rate (HGR) by comparing with Co/Ni. Furthermore, HGR can be further improved by treating the Co–Zn/Ni with NaOH solution because the partial dissolving of zinc results in the increase of cobalt active sites. Using a 10[Formula: see text]wt.% NaBH 4 and 5[Formula: see text]wt.% NaOH solution, the HGR was as high as 455[Formula: see text] mL min[Formula: see text] g[Formula: see text] at 25[Formula: see text]C, and the apparent activation energy was measured to be 50.2[Formula: see text] kJ mol[Formula: see text]. Cyclic performance of the NaOH-treated Co–Zn/Ni was investigated as well.
    Type of Medium: Online Resource
    ISSN: 1793-6047 , 1793-7213
    URL: Article
    DOI: 10.1142/S1793604717500655
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2017
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  • 3
    Online Resource
    Online Resource
    Co 3 O 4 nanowires as efficient catalyst precursor for hydrogen generation from sodium borohydride hydrolysis
    World Scientific Pub Co Pte Ltd ; 2018
    In:  Functional Materials Letters Vol. 11, No. 01 ( 2018-02), p. 1850018-
    Details
    In: Functional Materials Letters, World Scientific Pub Co Pte Ltd, Vol. 11, No. 01 ( 2018-02), p. 1850018-
    Abstract: Hydrogen generation from the catalytic hydrolysis of sodium borohydride has many advantages, and therefore, significant research has been undertaken on the development of highly efficient catalysts for this purpose. In our present work, Co 3 O 4 nanowires were successfully synthesized as catalyst precursor by employing SBA-15 as a hard template. For material characterization, high-resolution transmission electron microscopy (HRTEM), powder X-ray diffraction (XRD), fourier-transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and N 2 adsorption isotherms were employed, respectively. To measure the catalyst activity, typical water-displacement method was carried out. Using a reaction solution comprising 10[Formula: see text]wt.% NaBH 4 and 2[Formula: see text]wt.% NaOH, the hydrogen generation rate (HGR) was observed to be as high as 7.74[Formula: see text] L min[Formula: see text] g[Formula: see text] at 25[Formula: see text]C in the presence of Co 3 O 4 nanowires, which is significantly higher than that of CoB nanoparticles and commercial Co 3 O 4 powder. Apparent activation energy was calculated to be 50.9[Formula: see text]kJ mol[Formula: see text] . After recycling the Co 3 O 4 nanowires six times, HGR was decreased to be 72.6% of the initial level.
    Type of Medium: Online Resource
    ISSN: 1793-6047 , 1793-7213
    URL: Article
    DOI: 10.1142/S1793604718500182
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2018
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  • 4
    Online Resource
    Online Resource
    EFFECT OF VANADIUM CONTENT ON PHOTOLUMINESCENCE AND MAGNETIC PROPERTIES OF DOPED ZnO THIN FILMS
    World Scientific Pub Co Pte Ltd ; 2010
    In:  Modern Physics Letters B Vol. 24, No. 10 ( 2010-04-20), p. 945-951
    Details
    In: Modern Physics Letters B, World Scientific Pub Co Pte Ltd, Vol. 24, No. 10 ( 2010-04-20), p. 945-951
    Abstract: ZnO : V thin films with different doping concentration (0%, 1.8%, 3.9%, 6.8%, 10%, and 13%) were fabricated by direct current magnetron sputtering. The X-ray diffraction patterns show that the wurzite structure changed with doping concentration. Furthermore, we could not find any vanadium cluster or phase separation in the X-ray diffraction patterns. The photoluminescence of ZnO : V with different vanadium concentration was investigated. The room temperature photoluminescence spectrum indicates that the films have purple band with 370 nm and the bands with 475 and 490 nm. The peak intensity of room temperature photoluminescence spectrum was affected by vanadium contents and its position remained stable. The intensity of band with 370 nm increases with raising the vanadium concentration and then decreases. The hysteresis behavior indicates that films were ferromagnetic at 50 K. Room temperature ferromagnetism was observed for the film with the doping concentration at 6.8%. However, in this case almost no hysteresis is noticeable. The results implied that the doping concentration and crystalline microstructure influence strongly the film's magnetic characteristics. Increasing the vanadium content in the film caused the degradation of the magnetic ordering.
    Type of Medium: Online Resource
    ISSN: 0217-9849 , 1793-6640
    URL: Article
    DOI: 10.1142/S0217984910022998
    RVK:
    UA 5534.B
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2010
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