Engineering Iridium (Ir)-based electrocatalysts towards high activity and satisfactory durability for oxygen evolution reaction (OER) in acidic media has been long pursued to commercialize proton exchange membrane-based electrolyzers. Here we...
Developing
hierarchical nanostructures composed of transition-metal
dichalcogenides and hollow carbon matrixes is one of the attractive
avenues in energy storage and conversion field on account of their
unique the synergistic effect and stable architecture. Herein, N,
P-codoped hollow carbon nanocomposites combined with WSe2 nanosheets were fabricated via a robust strategy including a metal
chelation coordination method and high-temperature selenization treatment.
Such a typical hollow structure can offer numerous reaction sites
and more diffusion paths to accelerate the transport of Li-ions. In
addition, the carbon substrate is able to enhance electric conductivity
and alleviate the aggregation of the WSe2 nanosheets. As
a result, the as-prepared WSe2 nanosheets/N, P-codoped
carbon nanocomposites deliver the rate capability of 477 mA h g–1 at 5.0 A g–1. This electrode demonstrates
super-durable cyclability after 3000 cycles with the capability of
620 mA h g–1 at 1.0 A g–1. Moreover,
the as-prepared sample displays a high-power density (4987.5 W kg–1), high-energy density (125.1 W h kg–1), and impressive cyclic durability, when assembled with activated
carbon for hybrid Li-ion capacitors. This work proposes an effective
approach to design advanced hierarchical nanostructures in various
energy-related applications.
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