Hydrothermal synthesis and pseudocapacitive properties of morphology-tuned nickel sulfide (NiS) nanostructures

Naresh, Bandari; Punnoose, Dinah; Rao, S. Srinivasa; Subramanian, Archana; Ramesh, Balasundari; Kim, Hee-Je

doi:10.1039/c7nj05054b

Cited by 52 publications

(25 citation statements)

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“…Recently, there are a variety of transition‐metal sulfides which play versatile role in multifunctional materials and are being used in various electrochemical applications. Metal sulfides such as NiS, 7,8 CoS 2, 9,10 FeS 2, 11,12 SnS 2, 13,14 MnS 2, 15 WS 2, 16,17 MoS 2, 18,19 and CuS 20,21 have been used as capable electrode materials for pseudocapacitors due to their excellent electrochemical performance like good reversible capacity and synergistically high electrical conductivity 22‐24 . Among the above transition metal sulfides, NiS and CuS are one of the outstanding materials due to their richer redox reactions, higher reversible capacity and good electrical conductivity 25‐27 .…”

Section: Introductionmentioning

confidence: 99%

One‐step synthesis of hierarchical structured nickel copper sulfide nanorods with improved electrochemical supercapacitor properties

et al. 2021

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Summary Nanorods‐like structured ternary metal sulfides of Ni1‐xCuxS with various compositions (x = 0.1, 0.2 and 0.3), and binary sulfides of NiS and Cu9S5 were synthesised via a single‐step hydrothermal process. The structural properties and the functional groups of the synthesized materials were characterized by X‐ray diffraction (XRD) and Fourier transform infrared (FTIR) studies. Surface structure and chemical composition of the samples were inspected using field emission scanning electron microscopy (FE‐SEM) and energy dispersive X‐ray spectroscopy (EDAX). The electrochemical properties of the as‐synthesised metal sulfide based electrodes were investigated by cyclic voltammetry (CV) and galvanostatic charge‐discharge (GCD) analyses and the maximum specific capacitance (SC) of ~1092 F/g was achieved for the Ni0.8Cu0.2S at a current density of 15 mA/g, while pure NiS and Cu9S5 electrodes showed the minimum SC of ~575 and ~70 F/g, respectively. Further, the electrochemical impedance studies (EIS) revealed low Rct value (3.4 Ω) for the Ni0.8Cu0.2S electrode and improved electrochemical supercapacitor properties of Ni0.8Cu0.2S electrode because of to the synergistic effect and its well crystalline nanorods structure which offers more electrochemical active sites for faradaic reactions and fast electrolyte ions diffusion in to electrode. Additionally, the stability performance of the Ni0.8Cu0.2S electrode was performed at a fixed current density of 20 mA/g, and the Ni0.8Cu0.2S sample possesses the good cycling stability with the retention of 80% capacitance after 3000 GCD cycles. These results demonstrate that the as‐synthesised binary and ternary metal sulfides are suitable cost effective and pollution free electrode materials for supercapacitors.

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Section: Introductionmentioning

confidence: 99%

One‐step synthesis of hierarchical structured nickel copper sulfide nanorods with improved electrochemical supercapacitor properties

et al. 2021

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“…Supercapacitors are rechargeable devices based on the theory of electrochemical energy storage with higher specific capacitance, fast charge‐discharge characteristic, high power density and excellent electrochemical stability . According to different charge storage mechanisms, supercapacitors can be generally divided into electrical double layer capacitors (EDLCs) and pseudocapacitors . At the interface between electrode and electrolyte, electrostatic charge accumulates with the energy of EDLCs, while the storage energy of pseudocapacitor comes from the fast reversible Faradic reaction of active material .…”

Section: Introductionmentioning

confidence: 99%

Molten Salt Synthesis of Na‐Mn‐O Composites as Electrode Materials for High‐Performance Supercapacitors

Xuan

Tao

et al. 2019

ChemElectroChem

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Manganese (Mn) based oxide materials are regarded as one of the favorable electrode materials, exhibiting a high energy density, low-cost and environmental benignity. In this work, we focus on synthesizing hollandite NaÀ MnÀ O composites as potential supercapacitor electrode materials by a facile molten salt technique. The structure and the morphology of the NaÀ MnÀ O system were significantly influenced by the synthesis temperature. The NaÀ MnÀ O composite synthesized at 550°C (NaÀ MnÀ O 550) demonstrates a distinct structure and a mixed morphology of nanorods and nanoparticles. The NaÀ MnÀ O 550 composite exhibits the best electrochemical performance with 306.0 F/g at 0.5 A/g and maintains 80.7 % capacity after 3000 charge-discharge times at 5 A/g. The largest specific capacitance of 64.0 F/g (0.3 A/g) and high energy density of 20.0 Wh/ kg (226.1 W/kg) were achieved in the assembled asymmetric supercapacitor device based on the NaÀ MnÀ O 550 and active carbon. Moreover, a long-cycling lifetime with 92.9 % retention after 10000 cycles was performed, which holds broad prospect for practical application in high performance energy storage devices.[a] Prof.

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“…Among them, self-template method has been intensively investigated as an effective and versatile approach for the synthesis of NiCo 2 S 4 with more favorable structure and composition as well as narrow size distribution [9]. Generally, a self-template method involves the synthesis of template precursor and a subsequent sulfidation treatment process via ion exchange reactions and/or Kirkendall effect [9,27]. For instance, Chen et al [11] fabricated NiCo 2 S 4 nanotube arrays on nickel foam by treating the NiCo precursor with Na 2 S solution based on a Kirkendall process.…”

Section: Introductionmentioning

confidence: 99%

Uniform growth of NiCo2S4 nanoflakes arrays on nickel foam for binder-free high-performance supercapacitors

et al. 2018

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In this work, ultrathin NiCo 2 O 4 nanosheets have been synthesized through an electrodeposition method together with a further calcination process. By using CH 3 CSNH 2 as sulfur source, the NiCo 2 O 4 was converted into NiCo 2 S 4 via anion exchange reaction (from oxygen to sulfur). Scanning electron microscopy imaging together with the energy-dispersive X-ray spectroscopy mapping indicates the successful transformation from NiCo 2 O 4 to NiCo 2 S 4 . The uniform and porous NiCo 2 S 4 architectures show good electrical contact to the current collector and good wettability, which can facilitate the transport for electrons and electrolyte ions. As a result, the as-prepared NiCo 2 S 4 electrode shows a greatly enhanced electrochemical performance than NiCo 2 O 4 , with a high specific capacitance (1051 F g -1 at a current density of 0.5 A g -1 ) and good cycling stability (capacity retention of 85% after 5000 charge/discharge cycles). These impressive performances suggest that the porous NiCo 2 S 4 structures can be used as promising binder-free electrode materials for high-performance supercapacitors.

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Hydrothermal synthesis and pseudocapacitive properties of morphology-tuned nickel sulfide (NiS) nanostructures

Abstract: Metal sulfides have attracted considerable scrutiny compared to metal oxides owing to their distinguished electrochemical properties and various applications, such as solar cells and supercapacitors.

Cited by 52 publications

References 50 publications

One‐step synthesis of hierarchical structured nickel copper sulfide nanorods with improved electrochemical supercapacitor properties

One‐step synthesis of hierarchical structured nickel copper sulfide nanorods with improved electrochemical supercapacitor properties

Molten Salt Synthesis of Na‐Mn‐O Composites as Electrode Materials for High‐Performance Supercapacitors

Uniform growth of NiCo2S4 nanoflakes arrays on nickel foam for binder-free high-performance supercapacitors

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