Phase and morphology evolution of ultrathin Co(OH)2 nanosheets towards supercapacitor application
作者： Kun Ding , Xiao Zhang , Juping Li , Ping Yang , Xin Cheng
DOI: 10.1039/C7CE01130J
关键词:
摘要: Ultrathin α-Co(OH)2 nanosheets (NSs) were hydrothermally synthesized without using surfactants and templates. Interestingly, the ultrathin NSs evolved from graphene-like to hexagonal nanoplates (NPs) then transformed into a needle-like Co(CO3)0.5(OH)·0.11H2O phase with increasing reaction temperature time. The morphology evolution depended strongly on CO32− ions in solution. We ruled out possibility that originated adsorption of CO2 air proposed possible transition mechanism Co(CO3)0.5(OH)·0.11H2O, which was due decomposition hexamethylenetetramine driven by dynamics thermodynamics. could be regarded as dissolution–recrystallization–redissolution–recrystallization α-Co(OH)2. electrochemical behavior tests demonstrated electrode exhibited an excellent specific capacitance 833.4 F g−1 at 5 A g−1; however, 247.2 same current density. This property is attributed crystalline nature materials.
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