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.
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TL;DR: LiCoO2 (400°C) as discussed by the authors is a compound that was prepared by the reaction of Li2CO3 and CoCO3 at 400°C, which has approximately 6% cobalt within the lithium layers and is stable in many of the organic-based electrolytes that are currently employed in lithium cells.
323 citations
TL;DR: It is found for the first time that CO activation on hexagonal close-packed (HCP) Co not only has much higher intrinsic activity than that of face centered-cubic (FCC) Co but also prefers a different reaction route, i.e., direct dissociation with HCP Co but H-assisted dissociation on the FCC Co.
Abstract: Identifying the structure sensitivity of catalysts in reactions, such as Fischer–Tropsch synthesis from CO and H2 over cobalt catalysts, is an important yet challenging issue in heterogeneous catalysis. Based on a first-principles kinetic study, we find for the first time that CO activation on hexagonal close-packed (HCP) Co not only has much higher intrinsic activity than that of face centered-cubic (FCC) Co but also prefers a different reaction route, i.e., direct dissociation with HCP Co but H-assisted dissociation on the FCC Co. The origin is identified from the formation of various denser yet favorable active sites on HCP Co not available for FCC Co, due to their distinct crystallographic structure and morphology. The great dependence of the activity on the crystallographic structure and morphology of the catalysts revealed here may open a new avenue for better, stable catalysts with maximum mass-specific reactivity.
322 citations
TL;DR: In this article, the structural, optical, photo catalytic and antimicrobial properties of pure and cobalt doped ZnO nanoparticles synthesized by Co-precipitation method are presented.
321 citations
TL;DR: In this paper, a mechanism of reduction based on spectroscopic measurements of the surface phases before and after H2 treatment at 400 °C was proposed, where the authors showed that the cobalt in Magnesia-promoted CoO phases is reduced completely to the metal at much higher temperatures (500-700°C) but at 400°C the surface reduction is limited to 55% ± 5 after 1 h.
321 citations
TL;DR: In this article, the theory of a previous paper is applied to the paramagnetic resonance of certain cobalt salts and the splitting of the orbital levels by the crystalline field is first investigated, and then the further splitting by the spin-orbit interaction.
Abstract: The theory of a previous paper is applied to the paramagnetic resonance of certain cobalt salts. The splitting of the orbital levels by the crystalline field is first investigated, and then the further splitting by the spin-orbit interaction. The g -values so derived are in good agreement with experiment. The magnitude of the hyperfine splitting is also in good agreement.
319 citations