High Performance Electrode Material for Supercapacitors Based on Α-Co(Oh)2 Nano-Sheets Prepared Through Pulse Current Cathodic Electro-Deposition (Pc-Ced) Publisher



Aghazadeh M¹ ; Rashidi A² ; Ganjali MR^{2, 3}
Source: Electronic Materials Letters Published:2018

Abstract

In this paper, the well-defined nano-sheets of α-Co(OH)2 were prepared through the cathodic electrosynthesis from an additive-free aqueous cobalt nitrate bath. The pulse current cathodic electro-deposition (PC-CED) was used as the means for the controlling the OH− electrogeneration on the cathode surface. The characteristics and electrochemical behavior of the prepared cobalt hydroxide were also assessed through SEM, TEM, XRD, BET, and IR. The results proved the product to be composed of crystalline pure α phase of cobalt hydroxide with sheet-like morphology at nanoscale. Evaluations of the electrochemical behaviour of the α-Co(OH)2 nano-sheets revealed that they are capable to delivering the specific capacitance of 1122 F g−1 at a discharge load of 3 A g−1 and SC retention of 84% after 4000 continues discharging cycles, suggesting the nano-sheets as promising candidates for use in electrochemical supercapacitors. Further, the method used for the preparation of the compounds enjoys the capability of being scaled up. © 2018, The Korean Institute of Metals and Materials and Springer Science+Business Media B.V.