4.7 Article

High retention supercapacitors using carbon nanomaterials/iron oxide/nickel-iron layered double hydroxides as electrodes

期刊

JOURNAL OF ENERGY STORAGE
卷 46, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.est.2021.103805

关键词

Reduced graphene oxide; Oyster shell powder; Iron oxide; Carbon nanotubes; Pseudosupercapacitor; Asymmetric supercapacitor

资金

  1. Ministry of Science and Technology Taiwan [MOST 107-2221-E-007-008-MY3, MOST 110-2221-E-007-053]

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The article discusses a method for preparing electrodes with a 3D structure by mixing oyster shell powder with graphene oxide and iron sulfate solution, followed by a hydrothermal reaction to obtain electrodes for supercapacitors.
People's awareness regarding the environmental protection and energy crisis has greatly boost rapid development of advanced energy storage devices. In this regard, supercapacitors with long operation life and superior properties have considered as one of the powerful candidates for energy storage. Herein, electrodes with a 3D structure are fabricated by first mixing oyster shell powder with graphene oxide (GO) and iron sulfate solution and subsequently subjected to the hydrothermal reaction, in which GO is reduced to form reduced GO (rGO) and afterwards to fabricate rGO-FeOOH. Using dried rGO-FeOOH as the framework in the following chemical vapor deposition process, carbon nanotubes (CNTs) are successfully grew on the rGO surface. Then, NiFe layered double hydroxide (NiFeLDH) is deposited by electrochemical deposition to prepare the rGO-FeO-CNT-NiFeLDH electrodes. The rGO-FeO-CNT-700-NiFeLDH electrode performs an excellent capacitance of 411.9 F g(-1) at a scan rate of 5 mV s(-1). The rGO-FeO-CNT-700-NiFeLDH-60//AC-NiO asymmetric supercapacitor performs an energy density of 41.4 W h kg(-1) with a power density of 5600 W kg(-1). The capacitance increases up to 144.89% of its initial capacitance after operation for 3200 cycles and remains 102.2% capacitance retention after 5000 cycles demonstrating that the electrode with excellent property is applicable for energy storage devices.

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