In:
Advanced Materials, Wiley, Vol. 31, No. 28 ( 2019-07)
Abstract:
The rapid rise in energy demand in the past years has prompted a search for low‐cost alternatives for energy storage, supercapacitors being one of the most important devices. It is shown that a dramatic enhancement (≈1100%, from 155 to 1850 F g −1 ) of the specific capacitance of a hybrid stimuli‐responsive FeNi 3 –graphene electrode material can be achieved when the charge/discharge cycling is performed in the presence of an applied magnetic field of 4000 G. This result is related to an unprecedented magnetic‐field‐induced metal segregation of the FeNi 3 nanoparticles during the cycling, which results in the appearance of small Ni clusters ( 〈 5 nm) and, consequently, in an increase in pseudocapacitive sites. The results open the door to a systematic improvement of the capacitance values of hybrid supercapacitors, while moving the research in this area towards the development of magnetically addressable energy‐storage devices.
Type of Medium:
Online Resource
ISSN:
0935-9648
,
1521-4095
DOI:
10.1002/adma.201900189
Language:
English
Publisher:
Wiley
Publication Date:
2019
detail.hit.zdb_id:
1474949-X
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