Topic
Cobalt
About: Cobalt is a research topic. Over the lifetime, 69899 publications have been published within this topic receiving 1242058 citations. The topic is also known as: Co & Element 27.
Papers published on a yearly basis
Papers
More filters
TL;DR: In the presence of moderately strong acids in CH3CN, cobalt complexes with BF2-bridged diglyoxime ligands are active catalysts for the reduction of protons to H2 at potentials as positive as -0.28 V vs. SCE.
248 citations
TL;DR: In this article, the effects of Co loading and heat treatment temperature on the polypyrrole/C composite material were revealed through structural evaluations and electrochemical studies, based on these correlations, the authors were able to propose an ORR mechanism that occurs on this class of non-platinum based fuel cell cathode catalysts.
Abstract: The oxygen reduction reaction (ORR) processes in alkaline media that occur on a family of electrocatalyst materials derived from a Co containing precursor and a polypyrrole/C composite material (PPy/C) are investigated here. The effects of Co loading and heat treatment temperature on the CoPPy/C materials are revealed through structural evaluations and electrochemical studies. Principle component analysis (PCA), a mutivariant analysis (MVA) technique, is used to establish structure-to-property correlations for the CoPPy/C materials. In all cases, pyrolysis leads to formation of a composite catalyst material, featuring Co nanoparticles coated with Co oxides and Co2+ species associated with N−C moieties that originate from the polypyrrole structures. Based on these correlations, we are able to propose an ORR mechanism that occurs on this class of non-platinum based fuel cell cathode catalysts. The correlations suggest the presence of a dual site functionality where O2 is initially reduced at a Co2+ containi...
248 citations
TL;DR: In 1938, Otto Roelen discovered that cobalt was able to catalyze specifically the hydrocarbonylation of ethylene, and homogeneous catalysis was born.
Abstract: In1938,whileOttoRoelenwasstudyingtheFischer-Tropsch reaction, which converts H2/CO into alkanes and alkenes, and was trying to improve the yields by recycling ethylene, the cobalt catalyst deposited on a ThO2/SiO2 support produced some propanal. Fortunately, Roelen focused on this unexpected reaction and discovered that cobalt was able to catalyze specifically the hydrocarbonylation of ethylene.1-3 It was rapidly established that this reaction, which has been extended to various alkenes, was occurring in the organic phase: homogeneous catalysis was born.
248 citations
TL;DR: In this paper, carbon nanotubes were prepared by thermal decomposition of acetylene over silica-supported cobalt catalysts, and they were analyzed by means of transmission electron microscopy, X-ray diffraction and Fourier transform infrared spectroscopy.
248 citations
TL;DR: X-ray photoelectron spectroscopy (XPS) measurements of cobalt adsorbed on MnO2 reveal strong evidence that Co(II) has been oxidized to Co(III) as discussed by the authors.
247 citations