544-18-3Relevant articles and documents
A fast method to prepare Pd-Co nanostructures decorated on graphene as excellent electrocatalyst toward formic acid oxidation
Shafaei Douk, Abdollatif,Saravani, Hamideh,Noroozifar, Meissam
, p. 882 - 891 (2018/01/10)
The electrochemical reduction of cobalt (II) formate on graphene/glassy carbon electrode (G/GCE) surface in HCl (5 wt%) is used to prepare Pd-Co electrocatalyst. The Pd-Co nanostructures decorated on the graphene nanosheets were prepared in two steps: (1) electrochemical reduction of cobalt (II) formate and (2) the galvanic replacement reaction between Co and Pd2+. This approach has a number of advantages including being environmentally friendly, simple, low-price, and very fast. The morphology and bulk compositions of the samples were investigated via Field Emission Scanning Electron Microscopy (FESEM), X-ray diffraction (XRD) patterns, Energy Dispersive X-ray Spectroscopy (EDS). Electrochemical techniques, including Cyclic Voltammetry (CV), Chronoamperometry (CA) and Electrochemical Impedance Spectroscopy (EIS) measurements were used to analyze the electrochemical activity of the samples. The peak current density for oxidation of formic acid on Pd-Co/G electrocatalyst was very high (151.32 mA cm?2). The Pd-Co/G increased the current density 7.1 times more than Pd/C. Besides, the onset oxidation potential and peak potential for Pd-Co/G electrocatalyst illustrated a negative shift in comparison to Pd/C. Chronoamperometry experiment showed that the stability of the Pd-Co/G catalyst was remarkably promoted. The Pd-Co/G electrocatalyst represents extraordinary electrocatalytic activity and durability toward formic acid oxidation.
New complexes of Mn(II), Co(II), Ni(II) and Cu(II) with 2,2'- or 2,4'-bipyridine and formates (Synthesis, thermal and other properties)
Czakis-Sulikowska,Radwanska-Doczekalska,Czylkowska,Markiewicz,Broniarczyk
, p. 327 - 335 (2008/10/09)
New mixed-ligand complexes with empirical formulae: Mn(2-bpy) 1.5L2?2H2O, M(2-bpy)2L 2?3H2O (M(II)=Co, Cu), Ni(2-bpy)3L 2?4H2O and M(2,4'-bpy)2L 2?2H2O (where 2-bpy=2,2'-bipyridine, 2,4'-bpy=2,4'-bipyridine; L=HCOO- ) have been obtained in pure solid-state. The complexes were characterized by chemical and elemental analysis, IR and VIS spectroscopy, conductivity (in methanol and dimethylsulfoxide). The way of metal-ligand coordination discussed. The formate and 2,4'-bpy act as monodentate ligands and 2-bpy as chelate ligand. The new complexes with ligand isomerism were identified. During heating the complexes lose water molecules in one or two steps. Thermal decomposition after dehydration is multistage and yields corresponding metal oxides as final products. A coupled TG-MS system was used to analysis principal volatile thermal decomposition (or fragmentation) products of Ni(2,4'-bpy)2(HCOO) 2?2H2O under dynamic air or argon atmosphere.
Thermal dehydration of cobalt and zinc formate dihydrates by controlled-rate thermogravimetry (CRTG) and simultaneous X-ray diffractometry-differential scanning calorimetry (XRD-DSC)
Arii, Tadashi,Kishi, Akira
, p. 157 - 165 (2008/10/09)
The thermal dehydration study of the similar hydrated salts, cobalt and zinc formate dihydrates, have been carried out successfully by means of X-ray diffractometry-differential scanning calorimetry (XRD-DSC) and controlled-rate thermogravimetry (CRTG). X-ray diffraction analysis recorded simultaneously indicates that the resulting anhydrous product, Zn(HCO2)2, was crystalline, while Co(HCO2)2 was amorphous. The XRD-DSC data are proven to be invaluable in verifying the interpretation of overlapping processes in thermal events. In addition, these differences in the resulting anhydrous products can be explained from kinetic analysis results based on the CRTG data. The kinetic mechanism governing the dehydration of zinc formate dihydrate is a nucleation and growth process, while in the case of cobalt formate dihydrate a phase boundary controlled reaction is the governing mechanism.
