The Experts below are selected from a list of 18510 Experts worldwide ranked by ideXlab platform
Jiakuan Yang - One of the best experts on this subject based on the ideXlab platform.
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a novel Leady oxide combined with porous carbon skeleton synthesized from Lead citrate precursor recovered from spent Lead acid battery paste
Journal of Power Sources, 2016Co-Authors: Jiakuan Yang, Vasant R Kumar, Wei Zhang, Yanlin Xie, Junxiong Wang, Xiqing Yuan, Sha LiangAbstract:Abstract A novel nanostructured Leady Oxides comprising porous carbon skeleton has been synthesized by thermal decomposition of Lead citrate precursor, recovered from spent Lead-acid battery paste. The influences of O 2 percentage in the calcination atmosphere (O 2 /N 2 mixture) and the temperature on Leady oxide product characteristics are studied by chemical analysis, scanning electron microscopy (SEM) and X-ray diffraction (XRD). The major crystalline phases of the products are identified as Lead Oxides, metallic Pb, and carbon. Porous carbon is observed as skeletons within the Leady oxide (PbO containing some Pb metal) particles. Mass percentage of Pb metal in the Leady oxide increases with increasing the proportion of oxygen in the calcination atmosphere. However, the amount of carbon decreases from approximately 8.0 to 0.3 wt%, and the porous carbon skeleton structure is gradually damaged with oxygen concentration increasing. A model about the thermal decomposition of Lead citrate precursor is firstly proposed to elucidate these observations. The nanostructured Leady Oxides combined with porous carbon can be directly used as precursor of active materials in a new Lead acid battery.
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Lead citrate precursor route to synthesize nanostructural Lead oxide from spent Lead acid battery paste
Materials Research Bulletin, 2013Co-Authors: Xinfeng Zhu, Danni Yang, Qin Wang, Jianwen Liu, Vasant R Kumar, Jiakuan YangAbstract:Abstract Nanostructural Lead Oxides were prepared by the decomposition of a new type of Lead citrate precursor (Pb3(C6H5O7)2·3H2O), which was synthesized through leaching of spent Lead acid battery paste in citrate salt aqueous system and more economical compared with former precursor (Pb(C6H6O7)·H2O). The products were characterized by thermogravimetric–differential thermal analysis, scanning electron microscopy and X-ray diffraction. The results show that when Lead citrate of columnar-shape crystals are calcined in N2 gas, orthorhombic β-PbO is the main product containing small amount of Pb and C. On combusting the citrate in air, a mixture of orthorhombic β-PbO, tetragonal α-PbO and Pb with the particle size of 100–200 nm is obtained, with β-PbO as the major product. And the cyclic voltammetry measurements of Lead Oxides present different electrochemical redox potentials because of the different structure of Lead oxide obtained from Pb3(C6H5O7)2·3H2O.
Xinfeng Zhu - One of the best experts on this subject based on the ideXlab platform.
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Lead citrate precursor route to synthesize nanostructural Lead oxide from spent Lead acid battery paste
Materials Research Bulletin, 2013Co-Authors: Xinfeng Zhu, Danni Yang, Qin Wang, Jianwen Liu, Vasant R Kumar, Jiakuan YangAbstract:Abstract Nanostructural Lead Oxides were prepared by the decomposition of a new type of Lead citrate precursor (Pb3(C6H5O7)2·3H2O), which was synthesized through leaching of spent Lead acid battery paste in citrate salt aqueous system and more economical compared with former precursor (Pb(C6H6O7)·H2O). The products were characterized by thermogravimetric–differential thermal analysis, scanning electron microscopy and X-ray diffraction. The results show that when Lead citrate of columnar-shape crystals are calcined in N2 gas, orthorhombic β-PbO is the main product containing small amount of Pb and C. On combusting the citrate in air, a mixture of orthorhombic β-PbO, tetragonal α-PbO and Pb with the particle size of 100–200 nm is obtained, with β-PbO as the major product. And the cyclic voltammetry measurements of Lead Oxides present different electrochemical redox potentials because of the different structure of Lead oxide obtained from Pb3(C6H5O7)2·3H2O.
Enrico Verlato - One of the best experts on this subject based on the ideXlab platform.
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Porous oxide electrocatalysts for oxygen evolution reaction prepared through a combination of hydrogen bubble templated deposition, oxidation and galvanic displacement steps
Electrochimica Acta, 2018Co-Authors: Nicola Comisso, Lidia Armelao, Sandro Cattarin, Paolo Guerriero, Luca Mattarozzi, Marco Musiani, Marzio Rancan, Lourdes Vázquez-gómez, Enrico VerlatoAbstract:Abstract Porous oxide layers active in the oxygen evolution reaction (OER) were prepared with the following sequence of steps: (i) porous Pb was produced by cathodic hydrogen bubble templated electrodeposition; (ii) Pb was partially converted to its Oxides; (iii) Co 3 O 4 shells were formed on the surface of Lead/Lead Oxides nanowires by spontaneous galvanic displacement reactions. The effect of deposition current density and charge on the porous Pb morphology was studied. Deposits with extended surface areas were obtained and then oxidized in neutral Na 2 SO 4 solutions. Pb and PbO 2 , initially coexisting in oxidized samples, underwent a spontaneous reaction Leading to the formation of Pb 3 O 4 . Both PbO 2 and Pb 3 O 4 spontaneously reacted with Co 2+ to yield Co 3 O 4 layers. Co-modified electrodes described in this work had higher activity in oxygen evolution reaction (OER) than those obtained by submitting to galvanic displacement porous PbO 2 layers prepared by oxygen bubble templated anodic deposition.
Vasant R Kumar - One of the best experts on this subject based on the ideXlab platform.
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a novel Leady oxide combined with porous carbon skeleton synthesized from Lead citrate precursor recovered from spent Lead acid battery paste
Journal of Power Sources, 2016Co-Authors: Jiakuan Yang, Vasant R Kumar, Wei Zhang, Yanlin Xie, Junxiong Wang, Xiqing Yuan, Sha LiangAbstract:Abstract A novel nanostructured Leady Oxides comprising porous carbon skeleton has been synthesized by thermal decomposition of Lead citrate precursor, recovered from spent Lead-acid battery paste. The influences of O 2 percentage in the calcination atmosphere (O 2 /N 2 mixture) and the temperature on Leady oxide product characteristics are studied by chemical analysis, scanning electron microscopy (SEM) and X-ray diffraction (XRD). The major crystalline phases of the products are identified as Lead Oxides, metallic Pb, and carbon. Porous carbon is observed as skeletons within the Leady oxide (PbO containing some Pb metal) particles. Mass percentage of Pb metal in the Leady oxide increases with increasing the proportion of oxygen in the calcination atmosphere. However, the amount of carbon decreases from approximately 8.0 to 0.3 wt%, and the porous carbon skeleton structure is gradually damaged with oxygen concentration increasing. A model about the thermal decomposition of Lead citrate precursor is firstly proposed to elucidate these observations. The nanostructured Leady Oxides combined with porous carbon can be directly used as precursor of active materials in a new Lead acid battery.
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Lead citrate precursor route to synthesize nanostructural Lead oxide from spent Lead acid battery paste
Materials Research Bulletin, 2013Co-Authors: Xinfeng Zhu, Danni Yang, Qin Wang, Jianwen Liu, Vasant R Kumar, Jiakuan YangAbstract:Abstract Nanostructural Lead Oxides were prepared by the decomposition of a new type of Lead citrate precursor (Pb3(C6H5O7)2·3H2O), which was synthesized through leaching of spent Lead acid battery paste in citrate salt aqueous system and more economical compared with former precursor (Pb(C6H6O7)·H2O). The products were characterized by thermogravimetric–differential thermal analysis, scanning electron microscopy and X-ray diffraction. The results show that when Lead citrate of columnar-shape crystals are calcined in N2 gas, orthorhombic β-PbO is the main product containing small amount of Pb and C. On combusting the citrate in air, a mixture of orthorhombic β-PbO, tetragonal α-PbO and Pb with the particle size of 100–200 nm is obtained, with β-PbO as the major product. And the cyclic voltammetry measurements of Lead Oxides present different electrochemical redox potentials because of the different structure of Lead oxide obtained from Pb3(C6H5O7)2·3H2O.
Chaouki Boudaren - One of the best experts on this subject based on the ideXlab platform.
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hydrates and polymorphs of Lead squarate pb c4o4 structural transformations studied by in situ x ray powder diffraction and solid state nmr
Polyhedron, 2019Co-Authors: Thierry Bataille, Amira Bouhali, Cassandre Kouvatas, Chahrazed Trifa, Nathalie Audebrand, Chaouki BoudarenAbstract:Abstract Considering the low dimensionality of the crystal structure of the known Lead squarate tetrahydrate, Pb(C4O4)·4H2O, the thermal reactivity of the powdered compound and structural studies of lower hydrates have been investigated from X-ray single-crystal and powder diffraction data, solid state NMR and thermal analyses. It is shown that Pb(H2O)(C4O4) and two polymorphs of anhydrous PbC4O4 can be formed within different conditions. The departure of the water molecules Leads to the condensation of initial inorganic chains into 2D or 3D-type crystal structures. The full decomposition of the squarate ligand provides successive Lead Oxides.