One-step synthesis of Nickle Iron-layered double hydroxide/reduced graphene oxide/carbon nanofibres composite as electrode materials for asymmetric supercapacitor

Abstract

A novel NiFe-LDH/RGO/CNFs composite was produced by using a facile one-step hydrothermal method as electrode for supercapacitor. Compared with NiFe-LDH/CNFs, NiFe-LDH/CNTs and NiFe-LDH/RGO, NiFe-LDH/RGO/CNFs demonstrated a high specific capacitance of 1330.2 F g−1 at 1 A g−1 and a super rate capability of 64.2% from 1 to 20 A g−1, indicating great potential for supercapacitor application. Additionally, an asymmetric supercapacitor using NiFe-LDH/RGO/CNFs composite as positive electrode material and activated carbon as negative electrode material was assembled. The asymmetric supercapacitor can work in the voltage range of 0–1.57 V. It displayed high energy density of 33.7 W h kg−1 at power density of 785.8 W kg−1 and excellent cycling stability with 97.1% of the initial capacitance after 2500 cycles at 8 A g−1. Two flexible AC//LDH-RGO-CNFs ASC devices connected in series were able to light up a red LED indicator after being fully charged. The results demonstrate that the AC//LDH-RGO-CNFs ASC has a promising potential in commercial application.

Efficient Ni–Fe layered double hydroxides/ZnO nanostructures for photochemical water splitting

“…3). These diffraction patterns are well matched to the hydrotalcite phase of LDHs and are in good agreement with other reported works [17][18][19].…”

Fabrication of 9.6 V High-performance Asymmetric Supercapacitors Stack Based on Nickel Hexacyanoferrate-derived Ni(OH)2 Nanosheets and Bio-derived Activated Carbon

“…Generally, metal oxides exhibit higher specific capacitances and electrochemical stability compared to most of the conductive polymers; hence they can be used as ideal electrode materials for fabricating high-energy supercapacitors 23–25 . Among metal oxide materials, RuO 2 has been extensively explored due to its extraordinarily high specific capacitance, good conductivity and three distinct oxidation states accessible within 1.2 V 26,27 .…”

Two-Dimensional Mn-Co LDH/Graphene Composite towards High-Performance Water Splitting

“…Growing energy consumption and global environmental concerns have attracted lots of interests in seeking clean and sustainable energy sources. In that field, electrocatalytic water splitting has been applied as an effective pathway to realize the conversion of electric energy and the production of hydrogen [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. As a half reaction of the electrocatalytic water splitting, oxygen evolution reaction (OER) is a multi-step four-electron process and shows sluggish kinetics, thus an active catalyst is needed to lower the overpotential of the process [16][17][18].…”

“…Nowadays, the non-noble metal materials based on 3d transition metals, have been widely investigated and became the most potential alternatives for the noble metal catalysts attributed to its good availability, low price, environmental friendliness and relatively high activity. Several kinds of catalysts such as transition metal oxides [20][21][22][23][24][25][26][27], hydroxides [3,10,[28][29][30][31], phosphates [32,33] and sulfides [34][35][36] have been explored. In addition, the layered double hydroxides (LDH), which are composed of positively charged metal hydroxide layers with intercalated anions, have been regarded as potential catalysts for OER.…”

“…Compared with unary metal hydroxides, the involvement of two or more transition metals is proved to be beneficial for improving the catalytic activity. The Ni-Fe LDH [10,37], Ni-Co LDH [38], and Ni-V LDH [39] have been investigated and shown better catalytic activity than Ni(OH) 2 owing to the novel LDH structure. Furthermore, the ultrathin two-dimensional (2D) structure of LDH also allows it with fast diffusion of ions, which is believed to be important for increasing the OER efficiency [40].…”