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Hierarchical nickel-cobalt sulfide/niobium pentoxide decorated green carbon spheres toward efficient energy storage

Hekmat, F ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1039/d2se00263a
  3. Publisher: Royal Society of Chemistry , 2022
  4. Abstract:
  5. Progression in the renewable energy field is tied to the development of high-performance energy storage devices with superior power and energy densities. Herein, an innovative material design was employed to prepare binder-free nickel-cobalt sulfide (NCS) on niobium pentoxide (Nb2O5)-decorated carbon spheres (CSs). Initially, CSs were directly grown on nickel foam (NF) via a hydrothermal carbonization approach. Core/shell-like NCS@Nb2O5@CS-NF was then synthesized through a hydrothermal process, followed by an electrodeposition process. When employed as an electrode material, NCS@Nb2O5@CS-NF achieved an excellent volumetric capacity of 9300 C L−1 at a current density of 18 A L−1. Later, an asymmetric supercapacitor (ASC) was assembled using hydrothermally synthesized CSs as the negative electrode and NCS@Nb2O5@CS-NF as the positive electrode. Benefiting from a wide potential window (1.7 V in an aqueous electrolyte), the assembled ASC delivered a remarkable energy density of 410.4 W h L −1 and a high power density of 29.77 kW L−1. Given the merit of outstanding capacitive performance, the fabricated electrode seems to be a prospective candidate for utilization in renewable energy storages devices. © 2022 The Royal Society of Chemistry
  6. Keywords:
  7. Carbon ; Carbonization ; Electrolytes ; Energy storage ; Nickel compounds ; Niobium oxide ; Storage (materials) ; Sulfur compounds ; Asymmetric supercapacitor ; Carbon Spheres ; Cobalt sulphides ; Energy density ; Green carbons ; Nickel foam ; Niobium pentoxide ; Performance ; Power densities ; Renewable energy fields ; Cobalt compounds ; Alternative energy ; Electrode ; Electrolyte ; Hydrothermal system ; Innovation ; Inorganic compound ; Performance assessment
  8. Source: Sustainable Energy and Fuels ; Volume 6, Issue 12 , 2022 , Pages 3042-3055 ; 23984902 (ISSN)
  9. URL: https://pubs.rsc.org/en/content/articlelanding/2022/se/d2se00263a