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• W4323040338 abstract "The fast, low-cost, and efficient design of zeolite imidazolate frameworks (ZIF) based derivatives with perfect hollow channels is an effective method for enhancing their full water-splitting catalytic activities and achieving their commercial use. In this study, the novel cobalt nanoparticles embedded in nitrogen-doped porous carbon nanocages uniformly dispersed over two curved surfaces of biomass-derived hollow carbon fibers ([email protected] nanocage/HCF) were synthesized via the carbonization of the ZIF-67/hollow biomass fiber precursors. After the usage amounts of biomass fibers were optimized, the optimal [email protected] nanocage/HCF200 exhibited a larger surface area and higher dispersion states of [email protected] nanocages than the tightly packed pure [email protected] nanocages. Particularly, owing to the hollow and porous structures of [email protected] nanocages, more electrocatalytic active centers (i.e. the pyridinic-N, Co-Nx-C, pyrrolic-N, graphitic-N, high-valence Co, and other oxygen-containing functional groups) were exposed along surfaces of the [email protected] nanocage/HCF200 catalyst. In an alkaline solution, the hydrogen evolution reaction potential at 10 mA cm−2 for [email protected] nanocage/HCF200 was 165 mV more negative than that of 20 wt% Pt/C. Particularly, the oxygen evolution reaction potential at 10 mA cm−2 for [email protected] nanocage/HCF200 was 17 mV more negative than that of RuO2. For overall water splitting, the bifunctional [email protected] nanocage/HCF200 catalyst-based electrolysis cell achieved a current density of 10 mA cm−2 at a cell voltage of 1.618 V, which is 4 mV smaller than that of the state-of-the-art 20 wt% Pt/C||RuO2 cell (1.614 V). The perfect hollow and porous structures, uniformly dispersed [email protected] nanocages (locked by vast in situ formed carbon nanotubes), and abundant electrocatalytic active sites along the inner and outer surfaces of [email protected] nanocage/HCF200 contributed to the excellent water splitting catalysis. Particularly, owing to the excellent stabilities of hollow structures and uniformly dispersed porous [email protected] nanocages, the [email protected] nanocage/HCF200 exhibited higher stability toward water electrolysis." @default.
• W4323040338 created "2023-03-04" @default.
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• W4323040338 date "2023-06-01" @default.
• W4323040338 modified "2023-10-18" @default.
• W4323040338 title "Cobalt nanoparticles-embedded porous carbon nanocages uniformly dispersed hollow carbon fibers as the accelerated electrocatalysts toward water splitting" @default.
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• W4323040338 doi "https://doi.org/10.1016/j.jallcom.2023.169488" @default.
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