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: The pH dependence of the water splitting reaction suggests a proton-coupled electron transfer (PCET) catalytic mechanism and the turnover frequencies for the 4e(-)/4H(+) process at the single cobalt center of the hangman platform approach 1 s(-1).
Abstract: Cobalt hangman corrole, bearing β-octafluoro and meso-pentafluorophenyl substituents, is an active water splitting catalyst. When immobilized in Nafion films, the turnover frequencies for the 4e–/4H+ process at the single cobalt center of the hangman platform approach 1 s–1. The pH dependence of the water splitting reaction suggests a proton-coupled electron transfer (PCET) catalytic mechanism.
457 citations
TL;DR: In this article, the surface area changes of platinum (Pt) based catalysts supported on carbon were evaluated using an accelerated durability test (ADT) and the results obtained using the ADT were correlated to the performance of the Pt-based catalysts in the fuel cell, and the Pt catalyst exhibited loss of active surface area, and a resulting decrease in the oxygen reduction reaction (ORR) activity was observed.
456 citations
TL;DR: Li et al. as discussed by the authors proposed a doping method to enhance diffusion of Li ions as well as to stabilize structures during cycling, leading to impressive electrochemical performance, achieving an exceptionally high capacity of 190 mAh/g/1 with 96% capacity retention over 50 cycles.
Abstract: Lithium cobalt oxides (LiCoO2) possess a high theoretical specific capacity of 274 mAh g–1. However, cycling LiCoO2-based batteries to voltages greater than 4.35 V versus Li/Li+ causes significant structural instability and severe capacity fade. Consequently, commercial LiCoO2 exhibits a maximum capacity of only ~165 mAh g–1. Here, we develop a doping technique to tackle this long-standing issue of instability and thus increase the capacity of LiCoO2. La and Al are concurrently doped into Co-containing precursors, followed by high-temperature calcination with lithium carbonate. The dopants are found to reside in the crystal lattice of LiCoO2, where La works as a pillar to increase the c axis distance and Al as a positively charged centre, facilitating Li+ diffusion, stabilizing the structure and suppressing the phase transition during cycling, even at a high cut-off voltage of 4.5 V. This doped LiCoO2 displays an exceptionally high capacity of 190 mAh g–1, cyclability with 96% capacity retention over 50 cycles and significantly enhanced rate capability. Lithium cobalt oxides are used as a cathode material in batteries for mobile devices, but their high theoretical capacity has not yet been realized. Here, the authors present a doping method to enhance diffusion of Li ions as well as to stabilize structures during cycling, leading to impressive electrochemical performance.
455 citations
TL;DR: Nickel cobaltite has been synthesized by sol-gel and thermal decomposition techniques and the surface composition studied with Auger (AES) and X-ray photoelectron spectroscopies (XPS) as discussed by the authors.
454 citations
TL;DR: In this article, the influence of small amounts of Pt on supported Co catalysts has been investigated by several methods, and it was shown that Pt-promoted catalysts were 3-5 times higher than those on their unpromoted analogues.
453 citations