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Morphology and Phase Evolution of CoAl Layered Double Hydroxides in an Alkaline Environment with Enhanced Pseudocapacitive Performance
Author(s) -
Xu Tianhao,
Wu Xiaochao,
Li Yingjie,
Xu Wenwen,
Lu Zhiyi,
Li Yaping,
Lei Xiaodong,
Sun Xiaoming
Publication year - 2015
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201500005
Subject(s) - materials science , hydroxide , layered double hydroxides , chemical engineering , dissolution , recrystallization (geology) , porosity , coal , nanotechnology , chemistry , composite material , geology , organic chemistry , engineering , paleontology
The morphology and phase transformation of CoAl layered double hydroxide (denoted CAL) nanoplates are systematically investigated in highly concentrated basic solution. Characterization results reveal that this is a time‐dependent process, in which CALs are gradually converted to β‐Co(OH) 2 and CoOOH, and the structure becomes increasingly porous. This process could be caused by the dissolution of the Al part of CoAl LDHs, recrystallization of the Co part, and subsequent oxidation of Co. It is found that the pseudocapacitive performance of the products vary with the immersion time. CALs already show a reasonable performance, whereas short‐term treatment would lead to the enhanced capacitance of 1123 F g −1 with both remarkable rate capability and stability. However, the formation of CoOOH will significantly degrade the supercapacitive performance.