Construction of hierarchical ZnCo₂O₄@Ni_xCo_2x(OH)_6x core/shell nanowire arrays for high-performance supercapacitors

Abstract

Hierarchical ZnCo2O4@NixCo2x(OH)6x core/shell nanowire arrays have been successfully constructed for hybrid supercapacitors with outstanding performance.

Hierarchical FeCo2S4@FeNi2S4 Core/Shell Nanostructures on Ni Foam for High‐Performance Supercapacitors

“…[5b, 6] To address the aforementioned issues, transition metal sulfides can be considered, becauset hey can exhibit highere lectrochemical performance and higherc apacity due to enhanced electricalc onductivity and electrochemical activity. [7] Current studies are mainly concentrated on Ni-Co, [8] Zn-Co, [9] and Mn-Co [10] bimetallic metal sulfides. Since Fe 2 + is more active than other transition metals because of its variable valence states,F eCo 2 S 4 is supposed to be an excellent electrode material.…”

“…[3b, 17] Moreover, 3D core/shelln anostructures can enhance the electrochemical properties owningto their large surface areas with abundant active sites ande fficient electron transport. [9,18] Hence, growing core/shell nanostructures on conductive substrates to obtain hierarchicallys tructured, binder-free SC electrodes is likely to achieve remarkable electrochemical performance.…”

PVP assisted morphology-controlled synthesis of hierarchical mesoporous ZnCo 2 O 4 nanoparticles for high-performance pseudocapacitor

“…EDLCs store energy using ion adsorption (no faradaic (redox) reaction), wherein the electrical energy is being stored in the electric double layer near the interfaces between electrode and electrolyte. It uses activated carbon and carbon aerogels electrode with high specific surface area [6]. On the other hand, PCs go through faradaic process, which involves a direct transfer of electrons via oxidation reaction at one electrode then reduction on the other [7]; with this being said, PCs overall offered a more competitive capacitance than EDLCs, so that most of recent published papers focused on improving PCs.…”

Enhanced electrochemical supercapacitance of binder-free nanoporous ternary metal oxides/metal electrode

“…However, their working potential windows are usually very narrow. For example, the working potential windows of NiO, Co 3 O 4 , MnO 2 , etc., their sulfides are usually less than 0.8 V [4,[9][10][11][12][13][14][15][16][17][18][19][20][21]. To enhance the potential window of the electrodes, many efforts have been made, eg., using nonaqueous solutions as electrolytes [22][23][24], assembling asymmetric supercapacitors [25][26][27][28][29][30][31], and synthesizing new compounds.…”