ACS Applied Nano Materials
·
2023
·
IF 5.9
Qiaodan Wu,Tong Guo,Zhenhua Wu,Kangsheng Shi,Xingke Yang,Ziqiang She,Ruiya Zhao,Yunjun Ruan
Lithium–sulfur batteries are promising for high-capacity energy storage, but their performance is limited by the shuttle effect and unfavorable volume changes during the charging and discharging cycles. To address these issues, we synthesized NiCo2S4 hollow dodecahedra@nitrogen-doped carbon core/shell nanostructures (NiCo2S4@NC) using the ZIF-67 template and polydopamine carbonization. The high chemical conversion rate and large specific surface area of NiCo2S4 hollow dodecahedra promote fast and stable polysulfide conversion, while the N-doped carbon shell mitigates structural collapse and volume changes caused by reversible reactions of lithium sulfides. Coupling the superior polysulfide conversion of NiCo2S4 with the excellent polysulfide adsorption of the N-doped carbon shell, NiCo2S4@NC/S (72% sulfur loading) delivers an initial specific capacity of 1170 mA h g–1 at 0.2 C, a capacity retention of 61% after 300 cycles, and a reversible specific capacity of 420 mA h g–1 after 500 cycles at a high current density of 1 C. Our results suggest that NiCo2S4@NC can serve as a promising cathode material for lithium–sulfur batteries with improved performance and stability.
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高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Yaoyao Ning,Dandan Ma,Yu Shen,Fumin Wang,Xubin Zhang
Electrochemical water splitting into hydrogen energy offers a promising pathway for renewable and clean energy conversion and storage, but high overpotentials are needed to drive the process owing to the sluggish kinetics of the anodic oxygen evolution reaction (OER) and the cathodic hydrogen evolution reaction (HER). Herein, three-dimensional (3D) mushroom-like NiCo/NiCo 2 S 4 @NiCo arrays grown directly on Ni foam (NF) have been constructed via hydrothermal and electrodeposition methods. Owing to the unique mushroom-like structure and the beneficial effect of the composite catalyst, the NiCo/NiCo 2 S 4 @NiCo/NF electrode exhibits excellent activity and stability for both OER and HER. When serving as an anode electrocatalyst , the composite catalyst only requires a overpotential of 294 mV to achieve a high current density of 100 mA/cm 2 for the OER in 1 M KOH. Moreover, in chronopotentiometric and chronoamperometric measurements, the NiCo/NiCo 2 S 4 @NiCo/NF electrode displays distinguished electrochemical and structural stability for at least 100,000 s. Similarly, the NiCo/NiCo 2 S 4 @NiCo/NF catalyst delivers a hydrogen production current density of 10 mA/cm 2 at an overpotential of 132 mV and shows no obvious attenuation of performance after stability testing for 100,000 s in an extreme alkaline environment. Accordingly, the remarkable and stable bifunctional abilities enable the application of the NiCo/NiCo 2 S 4 @NiCo/NF catalyst in two-electrode water-alkali electrolyzers with a low cell voltage of 1.55 V to deliver a current density of 10 mA/cm 2 and excellent stability for over 27 h.
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高影响因子
Journal of Materials Chemistry A
·
2026
·
IF 9.2
Ying-Chu Chen,Ting-Ya Wu,Chih-Hung Tsai,Yu-Kuei Hsu
The integration of photovoltaics with electrochemical energy storage (EES) into monolithic photo–rechargeable systems represents a promising approach for sustainable, off–grid power sources, particularly in the context of the Internet of Things (IoT). Herein, we report a high–performance photo–capacitor (PC) constructed by coupling two series–connected dye–sensitized solar cells (DSSCs) with an asymmetric Bi//NiCo2S4 supercapacitor in a three–electrode configuration. Nickel cobalt sulfide (NiCo2S4) serves as a dual–function common electrode, providing both excellent electrocatalytic activity toward the I3-/I- redox reaction and high supercapacitive performance, while bismuth (Bi) is employed as a storage electrode, offering favorable energy alignment and wide operational potential. The optimized PC achieves a photovoltage exceeding 1.2 V under one–sun illumination and 0.9 V under 1000 lux LED illumination, with an areal capacitance of 170.4 mF cm-2 and an overall energy–storage efficiency of 7.05% under low–intensity solar irradiation (30 mW cm-2). The device demonstrates excellent rate capability, long–term cycling stability, and superior performance under dim–light conditions, confirming its potential as a standalone power supply for both indoor and outdoor IoT applications. This work highlights a strategic combination of band alignment, electrode design, and three–terminal architecture to realize efficient, standalone solar energy storage.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Ying Xue,Xilong Liu,Leiyun Han,Zhengjie Xie,Liangyu Liu,Yixin Li,Yingjie Hua,Chongtai Wang,Xudong Zhao,Xiaoyang Liu
The present study successfully synthesized NiCo 2 S 4 nanotubes@NiMn-LDH nanosheets core-shell hybrid structure on Ni foam through a controllable three-step facile hydrothermal method , the NiMn-layered double hydroxides (LDHs) nanosheets with unlike thicknesses adhere to the outer layer of NiCo 2 S 4 nanotubes by adjusting the heating time of hydrothermal reaction. The optimized NiCo 2 S 4 @NiMn-LDH electrode was able to transmit a high specific capacity of 822.64 C g −1 (4.36 C cm −2 ) at a high current density of 50 mA cm −2 , and maintained 92.7% of its initial specific capacity after 5000 cycles at a current density of 50 mA cm −2 when 2 M KOH was used as the electrolyte. Furthermore, an asymmetric supercapacitor (ASC) device fabricated with NiCo 2 S 4 @NiMn-LDH as the positive electrode and activated carbon (AC) as the negative electrode, and it achieved a maximal energy density of 53.10 W h kg −1 at a power density of 370.82 W kg −1 also maintained 94.3% retention of the initial specific capacitance after 10,000 cycles at a high current density of 20 mA cm −2 . With the excellent electrochemical properties , the as-prepared core-shell structured NiCo 2 S 4 @NiMn-LDH hybrid arrays have extraordinary application potential in the energy storage field.
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高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Sheng Zhao,Jing Xu,Min Mao,Lingjiao Li,Xuanhao Li
Based on hollow spherical NiCo 2 S 4 , Zn x Cd 1-x S with adjustable band structure was used to construct a composite for photocatalytic hydrogen evolution. The hollow spherical structure of NiCo 2 S 4 gives Zn x Cd 1-x S more contact positions to form a stable heterojunction. Through the band structure adjustment for Zn x Cd 1-x S, the induced electron transfer model was transformed into Z-scheme, which effectively enhances the photo-produced carrier separation efficiency of the composite material. At the same time, the fast electron transfer is realized by the great conductivity of the hollow spherical NiCo 2 S 4. This allows the composite material to obtain a shorter average lifetime of PL (0.15 ns) compared to Zn 0.5 Cd 0.5 S (3.9 ns). The composite NiCo 2 S 4 @Zn 0.5 Cd 0.5 S with Z-scheme heterojunction exhibited excellent photocatalytic HER activity and stability due to its unique spatial structure and efficient Z-scheme electron transfer path. The optimized composite NiCo 2 S 4 @Zn 0.5 Cd 0.5 S 1:1 photocatalytic HER rate reached 233.68 μmol . h −1 , which is equivalent to 5.81 times that of Zn 0.5 Cd 0.5 S (40.25 μmol . h −1 ).
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xiaoxiao Wang,Jing Li,Yuanyuan Liu,Meiri Wang,Yuchao Zhao,Hongtao Cui
For Faraday supercapacitors , some battery-type electrode materials such as nickel-based materials attract intensive attention by virtue of their high theoretical capacity. However, it is quite difficult for these materials to achieve the satisfied high-rate performance and cycling life concurrently due to the contradiction of their individual requirements to the microscopic structure of materials. In this work, we build a hollow architecture of NiCo 2 S 4 at hydrothermal condition following an in-situ reaction Ostwald Ripening mechanism. The as-prepared NiCo 2 S 4 presents a shell-strengthened hollow structure, satisfying the as-mentioned two requirements: (1) the rich pores in shell and hollow structure plus structural cobalt ions lead to the excellent high-rate performance of NiCo 2 S 4 ; (2) the dense particulate layer in shell with additional mechanical strength prolongs the cycling life of NiCo 2 S 4 . Consequently, the asymmetrical supercapacitors assembled with NiCo 2 S 4 as positive electrode material show both high energy and power densities, and excellent cycling stability.
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高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Chao He,Rui Wang,Yinshi Li
Bromine-based flow batteries (Br-FBs) are emerging rapidly due to their high energy density and wide potential window for renewable energy storage systems. Nevertheless, the sluggish kinetics of the Br2/Br– reaction on the electrode is considered to be the main challenge contributing to the poor performance of Br-FBs. Herein, we report self-assembled blossom-shaped NiCo2S4 nanosheets, enabling in situ growth on graphite felt (GF) via a one-step hydrothermal method. In the prepared NiCo2S4-GF, the gaps formed by the nanosheets restrict bromine diffusion, the sulfuretted blossom-shaped structure provides active sites with bromine adsorption capacity, and the synergistic effect of Ni and Co accelerates the electron transfer rate, which allow the electrode to exhibit excellent electrocatalytic activity compared to commercial GF, CoS-GF, and NiS-GF. Moreover, NiCo2S4-GF demonstrates unique selectivity for enhancing the Br2/Br– redox reaction compared to the bimetallic oxide of NiCo2O4-GF. Consequently, the zinc–bromine flow battery (ZBFB) with NiCo2S4-GF achieves an energy efficiency of 80.16%, which is 16.18% higher than that of the battery with commercialized GF at a current density of 60 mA cm–2, as well as a maximum power density of 260.75 mW cm–2 at 280 mA cm–2. The effective enhancement of the performance of ZBFB suggests that NiCo2S4-GF possesses great application potential in Br-FBs.
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PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Ju Qiu,Dayong He,Hao Wang,Wenyan Li,Bolun Sun,Yuying Ma,Xiaofeng Lu,Ce Wang
The development of highly efficient, earth-abundant and low-cost counter electrode materials is of significant importance and challenge for practical application in dye-sensitized solar cells. In this work, morphology-controlled NiCo 2 S 4 nanoparticles (NPs) and nanorods (NRs) decorating carbon nanofibers (CNFs) have been prepared via an electrospinning and hydrothermal or solvothermal strategy, which are further utilized as counter electrodes (CEs) in dye-sensitized solar cells (DSSCs). Benefitting from the rich nickel and cobalt ions redox chemistry and more exposed catalytically active sites from NiCo 2 S 4 NRs grown vertically on the surface of CNFs as well as faster electron transporting capability providing by the highly conductive CNFs, the DSSC device based on NiCo 2 S 4 NRs/CNFs CE yields an excellent power conversion efficiency of 9.47%, which is higher than that of the devices with NiCo 2 S 4 NPs/CNFs (8.63%), Pt (8.18%) and CNFs (6.06%) as CEs under AM 1.5 G irradiation. Furthermore, the NiCo 2 S 4 NRs/CNFs CE shows an excellent electrochemical stability in an iodine-based electrolyte. This study highlights a controllable and versatile route to rational design efficient counter electrode catalysts for high-performance CEs application.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 7
·1-12
·
IF 2.8
Su Zhen-Hong,Zhang Xiao-Fei,Shi Da-Wei,Zhang Xiao-Lei
Aim at developing electrode materials with prominent electrochemical performances for supercapacitor application, flower-like hierarchical nanostructure NiCo 2 S 4 powders (denoted as NCS-1) were synthesized by a facile one-step solvothermal method using the chelating agent of urea. The phase structure, particle morphology, specific surface area, and pore size distribution were examined, as well as the electrochemical properties of the electrodes prepared from the NiCo 2 S 4 powders. In order to tentatively explore the formation mechanism, NiCo 2 S 4 powders (denoted as NCS-2) were also prepared by the same method without urea. Meanwhile, the effect of urea on the structure and electrochemical performances was investigated. The results indicated that the chelating agent of urea played a significant role, coordinating with metal ions initially and releasing them slowly at elevating temperatures to form pure NiCo 2 S 4 compound. The NCS-1 electrodes exhibited a specific capacitance of 2339 F/g under a current density of 1 A/g and a capacitance retention of 56% after 5000 charge–discharge cycles measured at 20 A/g. The excellent electrochemical performances demonstrate that the flower-like NiCo 2 S 4 is a promising candidate for supercapacitor electrode.
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高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Wenhan Jia,Hao Wu,Ziyi Liu,Gaotuo Cai,Jianfeng Wen,Guanghui Hu,Tao Tang,Xinyu Li,Ming Li,Haifu Huang
In this work, nitrogen-doped graphene quantum dots (N-GQDs) are introduced into the honeycomb structure of NiCo2S4 nanoarrays on a carbon cloth by electrodeposition, which significantly enhances the electrochemical performances of NiCo2S4 as an electrode of hybrid supercapacitors. The honeycomb framework structure of NiCo2S4 nanosheets not only increases more active sites but also improves the structural stability of the electrode material. At the same time, the introduction of N-GQDs improves the wettability of NiCo2S4 and effectively reduces its internal resistance. As an electrode material, the NiCo2S4/N-GQDs@CC composite shows outstanding capacitive properties with an areal capacity of 1803 mC cm–2 at 3 mA cm–2. In addition, the assembled symmetric supercapacitor device can provide a high energy density of 127 μWh cm–2 at a power density of 1000 μW cm–2, good rate performance, and cycle stability. After 2500 cycles, the capacity retention rate can still reach 83%. The outstanding charge storage capability may be due to the synergistic effect between its unique honeycomb structure, high porosity, and improved electrical properties of N-GQDs. This simple and controllable synthesis strategy provides a reference for energy storage applications.
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高影响因子
RSC Advances
·
2022
·Vol. 12
·期 32
·20838-20849
·
IF 4.036
Hanzhang Ye,Yongli Ding,Tingting Liu,Jiani Li,Qi Wang,Yuhao Li,Jingjing Gu,Zhanen Zhang,Xuedong Wang
Traditional bimetallic sulfide-based nanomaterials often have a small specific surface area (SSA), low dispersion, and poor conductivity, thereby limiting their wide applications in the nanozyme-catalytic field. To address the above issues, we herein integrated NiCo2S4 with N,S-rGO to fabricate a nanocomposite (NiCo2S4@N,S-rGO), which showed a stronger peroxidase–mimetic activity than its pristine components. The SSA (155.8 m2 g−1) of NiCo2S4@N,S-rGO increased by ∼2-fold compared to NiCo2S4 with a pore size of 7–9 nm, thus providing more active sites and charge transfer channels. Based on the Michaelis–Menten equation, the affinity of this nanocomposite increased 40% and 1.1∼10.6-fold compared with NiCo2S4 with N,S-rGO, respectively, highlighting the significant enhancement of the peroxidase-like activity. The enhanced activity of this nanocomposite is derived from the joint participation of ˙OH, ˙O2−, and photogenerated holes (h+), and was dominated by h+. To sum up, N,S-codoping, rich S-vacancies, and multi-valence states for this nanocomposite facilitate electron transfer and accelerate reaction processes. The nanocomposite-based colorimetric sensor gave low detection limits for H2O2 (12 μM) and glucose (0.3 μM). In comparison with the results detected by a common glucose meter, this sensor provided the relative recoveries across the range of 97.4–101.8%, demonstrating its high accuracy. Moreover, it exhibited excellent selectivity for glucose assay with little interference from common co-existing macromolecules/ions, as well as high reusability (>6 times). Collectively, the newly developed colorimetric sensor yields a promising methodology for practical applications in H2O2 and glucose detection with advantages of highly visual resolution, simple operation, convenient use, and satisfactory sensitivity.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 1
·57-69
·
IF 3.591
Shengming Xu,Jing Xu,Linying Hu,Ye Liu,Lijun Ma
In this paper, NiCo2S4 was coated on the surface of WS2 of a 1T/2H mixed phase by a two-step hydrothermal method to form an in situ core–shell structure. The unique S-scheme heterojunction of the NiCo2S4@WS2 core–shell composite photocatalyst improved the easy recombination of carriers caused by the narrow band gap of NiCo2S4 and WS2, and improved the photocatalytic hydrogen production performance. The loading ratio of NiCo2S4@WS2, the addition of Eosin Y, and the pH value of TEOA were optimized. Under the optimal conditions, the hydrogen production rate reached 5.814 mmol g−1 h−1, which is about 8.55 times and 3.35 times the hydrogen evolution rates of NiCo2S4 and WS2, respectively. The composite catalyst exhibits excellent charge separation efficiency in photoelectrochemistry, PL and BET tests, carrier transport rate and large specific surface area that can provide more active sites, which are the main factors for the improvement of the hydrogen evolution performance. This paper demonstrates new design strategies to drive efficient photocatalytic hydrogen production by building in situ core–shell structures and optimizing the carrier transport paths, which will yield new insights.
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高影响因子
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