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: In this article, an effective and stable catalyst (ACFs-CoPc) was proposed for peroxymonosulfate (PMS) activation by supporting cobalt phthalocyanine onto activated carbon fibers covalently.
Abstract: Catalytic activation of peroxymonosulfate (PMS) to generate radicals has received considerable and increasing attention in environmental catalysis field. The development of highly efficient and environmentally friendly oxidation processes has been one of the most important and greatly challenging goals in PMS activation field. Herein, an effective and stable catalyst (ACFs-CoPc) was proposed for PMS activation by supporting cobalt phthalocyanine (CoPc) onto activated carbon fibers (ACFs) covalently. With the dye of Acid Red 1 (AR1) as probe compound, ACFs-CoPc could effectively activate PMS to eliminate AR1, and the catalytic activity of ACFs-CoPc was almost not impaired during ten successive runs without detectable cobalt leaching, indicating that ACFs-CoPc/PMS system was a pro-environmental and efficient oxidation system. A hybrid method that combines electron paramagnetic resonance (EPR) technology with different radical scavengers effect on PMS activation was employed for the investigation of active species during the catalytic reaction. It was found that both hydroxyl and sulfate radical (OH, SO4−) were generated; importantly, SO4− was speculated to serve as the dominant active species in the catalytic oxidation of AR1. Based on these results, a possible mechanism was proposed.
305 citations
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TL;DR: In this article, a pseudocapacitive material for supercapacitors was synthesized from nickel cobalt sulphides with different stoichiometric nickel and cobalt contents.
Abstract: Nickel cobalt sulphides with different stoichiometric nickel and cobalt contents have been synthesized and used as pseudocapacitive materials for supercapacitors. The as-employed polyol method is robust enough to use a one-pot synthesis of nickel cobalt sulphides with similar porous morphology and crystal structure at different nickel and cobalt ratios. The electrochemical performance of the nickel cobalt sulphides can be easily tuned by the varying the Ni and Co content. Owing to the combined contributions from both Ni and Co ions, the bimetallic Ni–Co sulphides show a superior pseudocapacitance compared to monometallic Co and Ni sulphides in terms of high specific capacitance, excellent rate capability and long cycle stability. In particular, the Ni1.5Co1.5S4 sample shows the highest specific capacitance of 1093 F g−1 at 1 A g−1, superior rate capability of 69% capacitance retention after a 50-fold increase in current densities, and longer cycle stability with increased specific capacitance of 108% of capacitance retention after 2000 cycles. In addition, the Ni1.5Co1.5S4 was also used to assemble an asymmetric supercapacitor with reduced graphene oxide and attains excellent capacitive performance with high specific capacitance (113 F g−1 at 1 A g−1), high energy density (37.6 W h kg−1 at 775 W kg−1) and high power density (23.25 kW kg−1 at 17.7 W h kg−1).
305 citations
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TL;DR: In this paper, a hydrometallurgical method involving natural organic acid leaching has been developed for recovery of lithium and cobalt from the cathode active materials in spent lithium-ion batteries.
305 citations
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TL;DR: It is suggested that the observed depletion of ascorbate by nickel( II) or cobalt(II) favors iron oxidation and thus inactivation of the enzyme, which is essential for maintaining iron in prolyl hydroxylases in the active iron(II] state.
303 citations
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TL;DR: A hydrometallurgical process was adopted for the comprehensive recovery of nickel, manganese, cobalt and lithium from sulfuric acid leaching liquor from waste cathode materials of spent lithium-ion batteries and may promise a candidate for the effective separation and recovery of metal values from the sulfuric Acid Leaching liquor.
303 citations