High Capacity and Energy Density of Zn–Ni–Co–P Nanowire Arrays as an Advanced Electrode for Aqueous Asymmetric Supercapacitor

Abstract

Developing multicomponent transition-metal phosphides has become an efficient way to improve the capacitive performance of single-component transition-metal phosphides. However, reports on quaternary phosphides for supercapacitor applications are still scarce. Here, we report high capacity and energy density of Zn−Ni−Co−P quaternary phosphide nanowire arrays on nickel foam (ZNCP-NF) composed of highly conductive metal-rich phosphides as an advanced binder-free electrode in aqueous asymmetric supercapacitors. In a three-electrode system using the new electrode, a high specific capacity of 1111 C g −1 was obtained at a current density of 10 A g −1 . Analysis of this aqueous asymmetric supercapacitor with ZNCP-NF as the positive electrode and commercial activated carbon as the negative electrode reveals a high energy density (37.59 Wh kg −1 at a power density of 856.52 W kg −1 ) and an outstanding cycling performance (capacity retention of 92.68% after 10 000 cycles at 2 A g −1 ). Our results open a path for a new design of advanced electrode material for supercapacitors.

Metal–Organic Framework‐Derived Anode and Polyaniline Chain Networked Cathode with Mesoporous and Conductive Pathways for High Energy Density, Ultrafast Rechargeable, and Long‐Life Hybrid Capacitors

“…f) Ragone plot at different current densities compared with previous dual‐carbon hybrid ion capacitors, [ 48,49 ] nonaqueous LICs, [ 50–54 ] and aqueous HES. [ 55–60 ]…”

“…f) Ragone plot at different current densities compared with previous dual-carbon hybrid ion capacitors, [48,49] nonaqueous LICs, [50][51][52][53][54] and aqueous HES. [55][56][57][58][59][60] In addition, the galvanostatic measurements showed a linear increase of the specific capacity at the potential between 1.6 and 4.5 V ( Figure S24 and Table S6, Supporting Information), supporting that PANI@rGO could play as a high-rate and highcapacity cathode structure. Additionally, Figure S25, Supporting Information, shows that PANI@rGO leads to electrochemical stability without morphology change even after 10 000 times of charge-discharge cycles.…”

“…Also, Table S9, Supporting Information, shows that the energy and power densities of MoO 2 @rGO//PANI@rGO full cell are far superior to those of many state-of-art previous dual-carbon hybrid ion capacitors, [48,49] nonaqueous LICs, [50][51][52][53][54] and aqueous HES. [55][56][57][58][59][60] Figure S28, Supporting Information, also reveals that the full cells at high mass loadings maintain high gravimetric energy densities. Additionally, the photovoltaic charging module was configured to charge HES full cells using electricity directly from a solar cell.…”

Phytic acid controlled in situ synthesis of amorphous cobalt phosphate/carbon composite as anode materials with a high mass loading for symmetrical supercapacitor: amorphization of the electrode to boost the energy density

“…[5][6][7][8][9] However, reports focusing on the utilization of these materials as anode materials for supercapacitors are limited. 5,[10][11][12] On the other hand, they have a tendency to aggregate, undergo quick phase transformation, and deteriorate performance. 13 Iron oxides have been broadly studied for use as anode materials with a high specic capacitance and energy density due to having multiple valence states of the metal ions that could enable a fast faradaic redox reaction.…”

Design and Fabrication of Hierarchical NiCoP–MOF Heterostructure with Enhanced Pseudocapacitive Properties

“…The derived energy and power densities are plotted in Figure 6d. The maximum energy density of 50.3 Wh kg −1 is delivered at a power density of 1011.2 W kg −1 , which is superior to some other HSCs in literatures, including CoNi–MOF//AC, [ 24 ] NiCoP nanoplates//graphene, [ 37 ] Co 0.1 Ni 0.9 P/CNF/CC||AC/CC, [ 44 ] NiCoP/NiCo‐OH30//PC, [ 54 ] ZnNiCoPNF//AC, [ 60 ] NC@SS//Fe 2 O 3 @SS, [ 61 ] P(Ni,Co)Se 2 //ZC, [ 62 ] NiCo 2 S 4 /GA//AC, [ 63 ] ZnNiPS//AC, [ 64 ] NiCoPCoP//PNGF, [ 65 ] and β‐FeOOH//NiCo hydroxides/Cu(OH) 2 /CF. [ 66 ] This device also displays a power density as high as 10 550.3 W kg −1 at 29.7 Wh kg −1 within 11 s, showing a high‐power nature.…”