Tailoring hierarchical yolk-shelled nickel cobalt sulfide hollow cages with carbon tuning for asymmetric supercapacitors and efficient urea electrocatalysis

Advances in Catalytic Electrooxidation of Urea: A Review

“…Apart from Ni oxides and hydroxides, heavier chalcogenides of Ni have recently generated significant interest as catalysts for the UOR, and this can be attributed to their low cost and improved electrochemical performance. [ 103–108 ] Khalafallah et al described the one‐pot hydrothermal synthesis of a NiCo selenide, immobilized on a porous carbon nanotube framework (NiCoSe/CNT), and demonstrated its use as an advanced electrode for UE. [ 103 ] This nanohybrid catalyst achieved a UO current density of ≈240 mA cm −2 at 0.50 V versus Hg/HgO in 1 m KOH and 0.5 m urea.…”

“…In a separate report, the same group described the fabrication of hollow NiCo sulfide cages with yolk‐shell morphology that are interspersed with amorphous carbon (NiCo 2 S 4 /C), using a one‐pot solvothermal procedure. [ 104 ] This composite system generated a UO current density of 204 A g −1 at 0.5 V versus Hg/HgO in 1 m KOH and 0.5 m urea. In comparison with NiCo 2 S 4 in the absence of carbon, the carbon‐containing material showed improved UO activity, with long‐term durability over 1000 consecutive cycles.…”

A soft molecular 2Fe–2As precursor approach to the synthesis of nanostructured FeAs for efficient electrocatalytic water oxidation

“…Our investigation provides a facile access to nanocrystalline FeAs, which opens the door to new applications of the material in magnetism, superconductors, supercapacitors, and photocatalytic hydrogen evolution. 41,42 Additionally, the so molecular precursor approach could be expanded to prepare other nanostructured materials containing TMs and non-metals, and to study their structural and electronic transformation with respect to the OER under alkaline conditions.…”

Ultrathin One-Dimensional Ni-MIL-77 Nanobelts for High-Performance Electrocatalytic Urea Evolution

“…Sufficient mesopores and a large specific surface area can not only provide a high electrochemical active area but also facilitate ion/mass diffusion. 33 In the current experimental procedure, an aqueous solution of 1.0 M KOH and 0.33 M urea is usually used as the electrolyte, The polarization curve was measured by linear voltammetry. The electrode surface is basically in a stable state when the scanning speed is slow.…”

“…Ultrathin nanobelts can produce a larger contact area with the electrolyte, which is conducive to the rapid conduction of electrons, so it has a better catalytic performance of urea. 33,40 As a result of being immersed in extreme conditions of strong alkalinity, the catalyst often dissociates chemical functional groups in a highly oxidizing environment, which leads to the phenomenon of catalyst deactivation. Even the catalytic properties of some precious metal-based materials will decay rapidly over time.…”