A fuel cell operating with aqueous sodium borohydride and hydrogen peroxide streams, with one, two and four cells (electrode area 64, 128 nd 256 cm2) connected in a bipolar mode in a filterpress flow cell is reported. The oxidation of borohydride ion was carried out on Au/C particles upported on a carbon felt electrode while the reduction of hydrogen peroxide was carried out on carbon supported...

This paper reports the results in the effort to destabilize lithium borohydride for reversible hydrogen storage. A number of metals, metal hydrides, metal chlorides and complex hydrides were selected and evaluated as the destabilization agents for reducing dehydriding temperature and generating dehydriding-rehydriding reversibility. It is found that some additives are effective. The Raman spect...

The title compound, [Zr(CH(3))(C(15)H(39)N(4)Si(3))], is a unique example of a triamido-amine-supported zirconium-methyl complex that crystallized as a monomer with trigonal-bipyramidal geometry at zirconium, featuring a Zr-C bond of 2.2963 (16) Å.

A general, atom-economical method for the synthesis of phosphaalkenes is reported via the net coupling of primary alkyl or aryl phosphines with aryl or alkyl isocyanides at zirconium. The phosphorus-containing ligand can be liberated as the phosphaformamide from zirconium by reaction with an organic electrophile.

A 16-year-old woman with congenitally missing permanent mandibular second premolars and central incisors presented for treatment. The prosthodontic treatment consisted of placing 2 internal tri-lobed narrow platform implants in the mandibular second premolar spaces, along with zirconium abutments and all-ceramic crowns. A 4-unit zirconium fixed partial denture was fabricated to restore the miss...

The specificity of a GC/MS assay of morphine and codeine was examined with particular regard to the potential interference due to hydromorphone and hydrocodone, compounds that cross-react extensively in opiate screening tests. A GC/MS method with solid-phase extraction and acetylation or trimethylsilylation was used. The equilibrium between keto and enol forms of the potential interferents was ...

ABSTRACT The phosphonate-substituted zirconium oxo clusters Zr6O2(OBu)12(O3PPh)4 and Zr7O2(OiPr)12(O3PCH2CH2CH2Br)6, with octahedrally coordinated Zr atoms, were synthesized by reaction of zirconium alkoxides with phosphonic acid bis(trimethylsilyl) esters. The basic structural motif are Zr3O(µ2-OR)3(OR)3 units which are connected in different ways. GRAPHICAL ABSTRACT

The exchange of the monocarboxylate ligand of the zirconium methacrylate oxocluster Zr(6)O(4)(OH)(4)(OMc)(12) (OMc = CH(2)=CH(CH(3))COO) with dicarboxylic acids (trans,trans muconic acid and terephthalic acid) leads to porous zirconium dicarboxylates exhibiting the UiO-66 architecture; the mild reaction conditions allow the control of their particle size.

Since the pioneer studies of Keilin and Hartree (l), considerable evidence has accumulated indicating that cytochrome c oxidase contains two heme moieties that react differently; hence the designation cytochrome U-Q. Reasons for this designat.ion include kinetic studies that show (a) differences in the rate of reduction and oxidation of cytochrome c oxidase measured at the a versus y absorption...

Direct Borohydride Fuel Cells (DBFCs) are considered as promising power sources for portable and mobile applications. Their advantages high theoretical energy density, cell voltage. Metallic Ni has recently emerged a electrode material DBFCs. In this work we combine electrochemical, operando Fourier-transform infrared spectroscopy (FTIRS), online differential electrochemical mass spectrometry (...