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Two‐Step Deposition/Reduction Synthesis of Porous Lamellar β‐Ni(OH) 2 /Reduced Graphene Oxide Composites with Large Capacitance for Supercapacitors
Author(s) -
Yuan Shuxia,
Lu Chunxiang,
Li Ying,
Wang Xiaomin
Publication year - 2017
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201700482
Subject(s) - materials science , supercapacitor , capacitance , graphene , lamellar structure , composite number , oxide , one step , dispersity , chemical engineering , deposition (geology) , composite material , porosity , electrode , nanotechnology , metallurgy , polymer chemistry , chemistry , paleontology , sediment , biology , engineering
Ni(OH) 2 /RGO composite are synthesized though a facile two‐step method, in which the Ni(OH) 2 deposition and GO reduction processes take place separately. The present methods promote the deposition of more Ni(OH) 2 and full utilization of RGO, owing to the high reactivity, good solubility, and dispersity of GO. Moreover, the utilization of additives is avoided. The Ni(OH) 2 /RGO synthesized by using the two‐step method shows a uniform porous lamellar structure with a high specific surface area. When employed as a supercapacitor electrode material, the Ni(OH) 2 /RGO composite exhibits a high specific capacitance of 2877 F g −1 , long cycle life with capacitance retention of 86.5 % after 4000 cycles, and high energy density of 120.9 Wh kg −1 at a power density of 0.14 kW kg −1 . The Ni(OH) 2 /RGO composite prepared by using the two‐step method in this work shows 11.8–85.1 % higher specific capacitances than composites fabricated by using the other method. The excellent performances and the facile synthesis method highlight the promising potential of the present Ni(OH) 2 /RGO composite in supercapacitor applications.