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Title: Synthesis and preservation of graphene-supported uranium dioxide nanocrystals

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USDOE Office of Nuclear Energy (NE)
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Journal Article: Publisher's Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 475; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-04 15:26:24; Journal ID: ISSN 0022-3115
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Citation Formats

Ma, Hanyu, Wang, Haitao, Burns, Peter C., McNamara, Bruce K., Buck, Edgar C., and Na, Chongzheng. Synthesis and preservation of graphene-supported uranium dioxide nanocrystals. Netherlands: N. p., 2016. Web. doi:10.1016/j.jnucmat.2016.03.027.
Ma, Hanyu, Wang, Haitao, Burns, Peter C., McNamara, Bruce K., Buck, Edgar C., & Na, Chongzheng. Synthesis and preservation of graphene-supported uranium dioxide nanocrystals. Netherlands. doi:10.1016/j.jnucmat.2016.03.027.
Ma, Hanyu, Wang, Haitao, Burns, Peter C., McNamara, Bruce K., Buck, Edgar C., and Na, Chongzheng. 2016. "Synthesis and preservation of graphene-supported uranium dioxide nanocrystals". Netherlands. doi:10.1016/j.jnucmat.2016.03.027.
title = {Synthesis and preservation of graphene-supported uranium dioxide nanocrystals},
author = {Ma, Hanyu and Wang, Haitao and Burns, Peter C. and McNamara, Bruce K. and Buck, Edgar C. and Na, Chongzheng},
abstractNote = {},
doi = {10.1016/j.jnucmat.2016.03.027},
journal = {Journal of Nuclear Materials},
number = C,
volume = 475,
place = {Netherlands},
year = 2016,
month = 7

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.jnucmat.2016.03.027

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  • No abstract prepared.
  • Highlights: • Electrochemical deposition of bimetallic PdAu NPs. • Highly loaded PdAu NPs are obtained. • Nafion–graphene supported PdAu NPs shows good activity for ethanol electrooxidation. - Abstract: A nafion–graphene ribbon (Nf–GR) supported bimetallic PdAu nanoparticles (PdAu/Nf–GR) catalyst was prepared by electrochemical codeposition of Pd and Au at constant potential. The prepared catalyst was characterized by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX), transmission electron microscopy (TEM) and X-ray diffraction analysis (XRD). The average particle size of PdAu nanoparticles (NPs) determined from XRD was 3.5 nm. The electrocatalytic activity of the PdAu/Nf–GR catalyst was examined by cyclic voltametry.more » It was observed that the as prepared catalyst showed efficient activity and good stability for ethanol electrooxidation in alkaline medium.« less
  • Supported uranium oxides were prepared on commercial SiO/sub 2/, TiO/sub 2/, Al/sub 2/O/sub 3/, and MgO carriers, and characterized by a variety of physicochemical techniques. Simultaneous thermoanalytical techniques (TG, DTA, DTG) allowed a mechanism to be proposed explaining the formation and stabilization of these catalysts. Combined X-ray Photoelectron Spectroscopy (XPS), Energy Dispersive X-ray Analysis (EDX), and analytical electron microscopy were used to probe the dispersion of the active phase on each support, as a function of the calcination temperature. Encapsulation phenomena of the active phase (UO/sub x/) by the support were observed in the case of SiO/sub 2/- and TiO/submore » 2/-based catalysts calcined at 900/sup 0/C. Strong oxide-oxide interaction was postulated to explain the corresponding XPS chemical shift of the uranium level. Segregation of UO/sub x/ species probably occurs on the more refractory supports, e.g., Al/sub 2/O/sub 3/ and MgO« less
  • The effects of carrier and metal particle size on the catalytic performance (initial intrinsic activity and deactivation characteristics) of Rh in the reaction of reforming of methane with carbon dioxide were investigated. The specific activity of Rh catalysts was found to strongly depend on the carrier employed to disperse the metal, decreasing in the order yttria-stabilized zirconia (YSZ) > Al{sub 2}O{sub 3} > TiO{sub 2} > SiO{sub 2} > La{sub 2}O{sub 3} > MgO, a result which correlates directly with the acidity characteristics of the carrier. The initial intrinsic activity and rate of deactivation of Rh were also found tomore » be sensitive to the metal particle size, in the range 1 - 6 nm. Both activity and rate of deactivation were found to decrease with increasing metal particle size. However, the degree of these dependences was found to be largely affected by the nature of the carrier, suggesting that the dependence of activity and rate of deactivation on metal particle size is likely to be related to metal-support interactions. While relatively high deactivation rates were observed over Rh supported on TiO{sub 2} and MgO, lower deactivation rates were observed over Rh supported on YSZ, Al{sub 2}O{sub 3}, La{sub 2}O{sub 3}, and SiO{sub 2}. Evidence was found that at least three kinds of factors contribute to catalyst deactivation, namely, carbon deposition, metal sintering, and poisoning of surface Rh sites by species originating from the carrier. The importance of each of these factors was found to be determined by the nature of the carrier. 36 refs., 9 figs., 3 tabs.« less
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