In:
Nanoscale, Royal Society of Chemistry (RSC), Vol. 13, No. 36 ( 2021), p. 15431-15444
Abstract:
Three-dimensional (3D) hybrid networks consisting of reduced graphene oxide (rGO) sheets interconnected by Co 3 O 4 nanowires (rGO/Co 3 O 4 ), followed by the decoration of Fe 2 O 3 nanospheres (NSs) (rGO/Co 3 O 4 @Fe 2 O 3 ), were demonstrated by a facile hydrothermal method, with which the rGO/Co 3 O 4 networks acted as nucleation sites for the in situ synthesis of Fe 2 O 3 NSs. The intimate contacts between rGO, Co 3 O 4 NWs and Fe 2 O 3 NSs, which result in an excellent conductive behavior, provide a unique structure with huge potential for electrochemical property promoted electrochemical supercapacitors. The rGO/Co 3 O 4 @Fe 2 O 3 hybrid networks as electrodes exhibit a high capacitance of 784 F g −1 at 1 A g −1 with 83% retention of the initial capacitance as the current density increases from 1 to 10 A g −1 , which is explained by the graphene-based interconnected structure owing to the advantages of accommodating the volume expansion between Co 3 O 4 NWs and Fe 2 O 3 NSs. The supercapacitor was assembled by applying a nickel aluminum layered double hydroxide (NiAl-LDH) structure and rGO/Co 3 O 4 @Fe 2 O 3 as the electrode materials and yields an energy density of 70.78 W h kg −1 at a power density of 0.29 kW kg −1 . The energy density can maintain 24.24 W h kg −1 with 9.94 kW kg −1 .
Type of Medium:
Online Resource
ISSN:
2040-3364
,
2040-3372
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2021
detail.hit.zdb_id:
2515664-0