1D interconnected porous binary transition metal phosphide nanowires for high performance hybrid supercapacitors

Abstract

The one-dimensional (1D) nanostructured battery-type electrode materials are considered as a promising candidate to develop high energy hybrid supercapacitors (HSCs) owing to their reversible and abundant redox activity.Herein, we report 1D nickel cobalt phosphide (NCP) wire-like nanoarchitecture, which is prepared by hydrothermal method and subsequent phosphorization treatment. The 1D interconnected porous NCP nanowires are featured with the rich exposed redox active sites and fast charge transport pathway for high-capacity battery-type electrodes. The bimetallic NCP electrode exhibits a larger specific capacitance of 1395 F g À1 than those of monometallic nickel phosphide (920 F g À1 ) and cobalt phosphide (568 F g À1 ) electrodes at 1 A g À1 . The HSCs are constructed using bimetallic 1D NCP nanowires and the activated carbon as positive and negative electrodes, respectively. The resulting HSCs deliver the improved energy density of 53.31 W h kg À1 and power density of 46.53 kW kg À1 along with the capacitance retention of 83.04% over 20 000 cycles.

Synergistic effects of nanoarchitecture and oxygen vacancy in nickel molybdate hollow sphere towards a high‐performance hybrid supercapacitor

“…38 Furthermore, the redox peaks move towards +ve and Àve directions as the sweep rate increases, indicating the internal resistance of the electrode. 39,40 The b-NiMoO 4 electrode also exhibits similar electrochemical behavior, depicted in Figure S2a.…”

“…A couple of Faradaic redox peaks can be detected from the CVs at every scan rate at 0 to 0.55 V. Besides, the shape of the CVs remains unchangeable as the scan rate increases, indicating its well‐capacitive properties, better reversibility, and excellent rate capability of the Ov‐NiMoO 4 electrode 38 . Furthermore, the redox peaks move towards +ve and −ve directions as the sweep rate increases, indicating the internal resistance of the electrode 39,40 . The b‐NiMoO 4 electrode also exhibits similar electrochemical behavior, depicted in Figure S2a.…”

Interfacial engineering in amorphous/crystalline heterogeneous nanostructures as a highly effective battery-type electrode for hybrid supercapacitors

“…According to the compared results (Tables 1 and S2 †), the CC/NiCo 2 -O 4 @NiCo-P-5 electrode presents the highest rate performance and specic capacity among other phosphate and amorphouscrystalline electrodes due to the integrated collaborative structure. [38][39][40][41][42][43][44][45][46][47] This result can be further proved by the electrochemical impedance spectroscopy (EIS) tests of the three electrodes. It can be seen from the impedance spectrum that CC/NiCo 2 O 4 @NiCo-P-5 (Fig.…”

Porous Carbon Template Decorated with MOF‐Driven Bimetallic Phosphide: A Suitable Heterostructure for the Production of Uninterrupted Green Hydrogen via Renewable Energy Storage Device

“…However, due to their low chemical stability, shaky adherence on the electrode surface, and limited exposure of active sites, TMPs are unable to set benchmarks as compared to noble metals, which restricts their industrial usage. [31,32] In this aspect, the current research focuses toward the rational design of MOF (Metal-organic framework)-based transition metal phosphide for energy storage device designing such as supercapacitors owing to its high ionic conductivity, high porosity and high density of surface metal atoms. [33] Simultaneously, the high surface area of MOF architecture has been exploited extensively for solar assisted over all water splitting with high solar-to-hydrogen (STH) conversion efficiency.…”