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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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Journal ArticleDOI
TL;DR: The development of ultrafine PtCo alloy nanoparticle decorated one-dimensional Co nanowires grown on Ti mesh (PtCo-Co/TiM) can deliver an ultrahigh current density and provides excellent long-term electrochemical durability.
Abstract: It is highly desired to design and develop highly efficient electrocatalysts for alkaline hydrogen evolution reactions. Herein, we report the development of ultrafine PtCo alloy nanoparticle decorated one-dimensional Co nanowires grown on Ti mesh (PtCo–Co/TiM). Owing to its favorable composition and structure, the PtCo–Co/TiM can deliver an ultrahigh current density of 46.5 mA cm−2 at an overpotential of 70 mV in 1.0 M KOH, superior to recently reported Pt-based electrocatalysts. This catalyst also provides excellent long-term electrochemical durability with its catalytic activity being maintained for at least 50 h.

185 citations

Journal ArticleDOI
TL;DR: In this paper, a two-step method is employed to obtain metal clusters (Ru, Pt, Pd etc.) combining single cobalt atoms anchored on nitrogen-doped carbon (Ru/Pt/Pd@Co-SAs/N-C).

185 citations

Journal ArticleDOI
TL;DR: The cobalt-III-salen complex of a salen ligand bearing one quaternary ammonium salt on the three-position of one aromatic ring is a highly active catalyst for the alternating copolymerization of cyclohexene oxide (CHO) and CO2 to afford the corresponding poly(cyclohexenes carbonate) (PCHC) at various temperatures as mentioned in this paper.
Abstract: The cobalt(III) complex of a salen ligand bearing one quaternary ammonium salt on the three-position of one aromatic ring is a highly active catalyst for the alternating copolymerization of cyclohexene oxide (CHO) and CO2 to afford the corresponding poly(cyclohexene carbonate) (PCHC) at various temperatures. The cobalt-based catalyst exhibited excellent activity and selectivity for polymer formation at high temperatures up to 120 °C and even under low CO2 pressures of 0.1 MPa. Also, the cobalt(III)-salen complex could operate very efficiently for the terpolymerization of CHO and aliphatic epoxides with CO2 to provide selectively polycarbonates with a narrow polydispersity at high temperatures. The polycarbonates resulting from the terpolymerization of equimolar CHO and propylene oxide (PO) with CO2 have a close content for both cyclohexene carbonate and propylene carbonate units. This is ascribed to the presence of CHO significantly inhibiting the reactivity of PO and thereby causing a matched reactivity ...

185 citations

Journal ArticleDOI
TL;DR: In this paper, the saturation magnetizations in the binary FeCo system were redetermined since an earlier investigation (P. Weiss and R. Forrer, Ann. Phys. 12, 1929) was made prior to the discovery of a CsCl-type ordered structure that has a wide solubility range.
Abstract: Saturation magnetizations in the binary Fe–Co system were redetermined since an earlier investigation (P. Weiss and R. Forrer, Ann. Phys. 12, 1929) was made prior to the discovery of a CsCl‐type ordered structure that has a wide solubility range. The alloys were quenched from 850°C at various rates in an attempt to suppress the ordering reaction. The magnetizations decreased as the quenching rate increased for alloys containing between 30 and 70 at.% cobalt. A maximum difference at 3% in the mean moment p was obtained for an equiatomic alloy quenched at the extreme rates. The mean moments for the ordered alloys are in good agreement with the previous investigation. The data for the fast quenched (presumably disordered) alloys indicate that the Slater‐Pauling curve, in the electron‐concentration range between iron and cobalt, has a maximum at about 28 at.% cobalt, compared with the 35 at.% suggested by the data of Weiss and Forrer.

185 citations

Journal ArticleDOI
TL;DR: In this paper, the reactivity of the cobalt oxides is attributed to the fact that the products of lithiation are in the form of nanosized products, and the CoO electrode demonstrates a stable reversible lithium storage capacity of about 300 mg−1, even after 30 cycles.

185 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20232,622
20225,202
20212,220
20202,950
20193,215
20183,007