Synthesis of Ni‐riched NiO‐Co ₃ O ₄ sheet‐like nanocomposites and their application in supercapacitors

Abstract

In this reported work Ni-riched NiO-Co 3 O 4 sheet-like nanocomposites (SNCs) were obtained through a facile solvothermal method in a mixed solvent and subsequently calcinated in air. Galvanostatic charge-discharge measurement revealed that the Ni-riched NiO-Co 3 O 4 SNCs electrode has an impressive specific capacitance as high as 836 F g −1 at 4 A g −1 in 3 M KOH solution. The as-obtained Ni-riched NiO-Co 3 O 4 SNCs product showed a weak cycling stability, but the higher capacitance (424 F g −1) was retained after 1000 cycles at 4 A g −1 .

Intercalation pseudocapacitance of expanded graphite in sodium‐ion capacitors

“…Introduction: Nowadays, as people pay more attention to energy and environmental problems, non-conventional energy devices such as batteries, fuel cells and supercapacitors have been widely researched throughout the world [1][2][3][4][5][6]. Electrochemical supercapacitors, which are one of the non-conventional energy devices, have attracted considerable interest because of their high specific capacitance, high-power density and long cycle life [7][8][9]. Based on the energy storage mechanisms, supercapacitors can be divided into two categories: electrical double layer capacitors and pseudocapacitors [10].…”