Coaxial nickel cobalt selenide/nitrogen-doped carbon nanotube array as a three-dimensional self-supported electrode for electrochemical energy storage
Chen Zhang, Shang Wang, Junwu Xiao
TL;DR
A new three-dimensional electrode structure is developed for energy storage, offering high capacity and long cycle life.
Contribution
A one-step method to create a coaxial nickel cobalt selenide/nitrogen-doped carbon nanotube array as a self-supported electrode.
Findings
The coaxial array electrode shows over 7 times higher areal capacity than conventional structures.
The device achieves a volumetric capacity of 22.5 C cm−3 and retains 86% after 10,000 cycles.
It delivers a volumetric energy density of 4.9 mW h cm−3 and a power density of 208.1 mW cm−3.
Abstract
Herein, we propose a one-step urea pyrolysis method for preparing a nitrogen-doped carbon nanotube array grown on carbon fiber paper, which is demonstrated as a three-dimensional scaffold for constructing a nickel cobalt selenide-based coaxial array structure. Thanks to the large surface area, interconnected porous structure, high mass loading, as well as fast electron/ion transport pathway of the coaxial array structure, the nickel cobalt selenide/nitrogen-doped carbon nanotube electrode exhibits over 7 times higher areal capacity than that directly grown on carbon fiber paper, and better rate capability. The cell assembled by a nickel cobalt selenide/nitrogen-doped carbon nanotube positive electrode and an iron oxyhydroxide/nitrogen-doped carbon nanotube negative electrode delivers a volumetric capacity of up to 22.5 C cm−3 (6.2 mA h cm−3) at 4 mA cm−2 and retains around 86% of the…
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Taxonomy
TopicsSpider Taxonomy and Behavior Studies · Environmental and Biological Research in Conflict Zones · Collembola Taxonomy and Ecology Studies