Mesoporous CoO Nanocubes @ Continuous 3D Porous Carbon Skeleton of Rose-Based Electrode for High-Performance Supercapacitor

Abstract

Supercapacitors have attracted lots of attentions for energy storage because of their outstanding electrochemical properties, and various kinds of carbon materials have been used to improve the performance. In this work, we innovatively elevate a natural rose-based continuous 3D porous carbon skeleton. The as-prepared carbon skeleton is graphited to some extent and possesses hierarchical interconnected 3D porous structures, providing a high electrical conductive and electrolyte easy-infiltrated substrate for the fabrication of ideal monolithic composite electrodes. Then, we utilized it as scaffold to prepare mesoporous CoO nanocubes @ continuous 3D porous carbon skeleton of rose composite-based electrode for supercapacitor via hydrothermal approach. The obtained material exhibits a noticeable pseudocapacitive performance with a brilliant capacitance of 1672 F/g at 1 A/g and as high as 521 F/g at 40 A/g. It also should be noted that ∼82% of the capacitance was maintained after 3000 cycles at 5 A/g, and only 40% capacitance loss after 1500 cycles at a relatively high current density of 10 A/g.

A flexible fiber-shaped supercapacitor utilizing hierarchical NiCo2O4@polypyrrole core–shell nanowires on hemp-derived carbon

“…[3,[5][6][7] However, they remain exhibit unsatisfactory parts because of unattractive price and non-negligible mass. [17,18] Therefore, it is a promising strategy to develop flexible fiber-shape biobased carbon materials, which will endow them with great application potential and tremendous economic benefits. [8] As an ideal substitute, carbon fibers have emerged with the unique advantages of a low-weight structure, high-strength construction, higher specific surface area and better electrical conductivity.…”

Porous NiCo2S4 Networks as Electrodes for Electrochemical Supercapacitors

“…The potential range is from 0 V to 0.4 V (versus SCE). A pair of redox peaks at 0.26-0.15 V is observed from each CV curve from the porous NiCo 2 S 4 materials electrodes, which can be attributed to the redox reactions of NiCo 2 S 4 electrode materials given as follows 37 : The potentials of the redox processes of Ni 2þ /Ni 3þ and Co 3þ /Co 4þ are the characteristic of reversible Faradaic redox reactions. The GCD curves at di®erent current densities of 1, 3, 6, 9 and 12 A g À1 are shown in Fig.…”

Chemical synthesis of hierarchical NiCo2S4 nanosheets like nanostructure on flexible foil for a high performance supercapacitor

“…Various transition metal oxides are used in supercapacitors, such as RuO 2 12 , NiO 13 , ZnO/NiO 14 , CuO 15 , NiCoO 2 16 , CuO 17 , CoO 18 , 19 , FeO 2 20 , and MnO 2 21 , and metal sulfides such as NiS 22 , MnS 23 , 24 , CoS 25 , CoS 2 26 , and CuCo 2 O 4 ; 27 these are attractive electrode materials for supercapacitor applications. Recently, transition metal chalcogenides are increasingly used in supercapacitor applications.…”