JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Lei Liu,Yueyue Li
The spinel and perovskite-based heterogeneous catalysts play indispensable roles in the sulfate radical-based advanced oxidation process (SR-AOP). In this study, novel electrospun boron-doped NiCo 2 O 4 /LaCo 1−x B x O 3 (NCO/B x , 0 ≤ x < 1) catalysts were constructed using defect and interface engineering to accelerate peroxymonosulfate (PMS) activation. Due to the synergistic impacts of oxygen vacancies (OVs) and heterointerfaces, NCO/B 0.2 demonstrated improved catalytic performance toward the degradation of Orange II (Org II). The NCO/B 0.2 catalyst showed a high degree of pH tolerance, with a range of 5.0–11.0, while maintaining a removal rate of 94.2% even after five cycles. The degradation pathway exhibited a preference for non-radical mechanisms, with singlet oxygen ( 1 O 2 ) being the dominant reactive oxygen species. The synthesis method for NCO/B x exhibits the potential to facilitate rational design and large-scale production of exceptionally effective heterostructured catalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Haowen Wang,Shixuan Feng,Maoqin Sun,Xue Li,Chuanjin Wang,Zhongtai Lin,Mingliang Ma,Tingxi Li,Yong Ma
In contemporary times, electromagnetic radiation poses a significant threat to both human health and the normal functioning of electronic devices. Developing composites as adsorption materials possess exceptional electromagnetic wave absorption performances can efficient address this critical issue. Herein, hollow core–shell NiCo 2 O 4 @polypyrrole nanofibers/reduced graphene oxide (NiCo-HFPR) composites are fabricated by the combination of electrostatic spinning, air calcination, in-situ polymerization, freeze-drying and hydrazine vapor reduction. As anticipated, NiCo-HFPR-0.2 exhibits noteworthy properties, with the minimum reflection loss (RL min ) of −61.20 dB at 14.26 GHz and 1.56 mm, as well as the effective absorption bandwidth (EAB) of 4.90 GHz at 1.57 mm. Additionally, the simulation procedure is employed to determine the radar cross-section (RCS) attenuation. In comparison to a singular perfect electrically conductive (PEC) layer, the PEC layer coated with NiCo-HFPR-0.2 consistently yields an RCS value below −10 dB m 2 within the range of −60° < θ < 60°. The RCS attenuation value of the NiCo-HFPR-0.2 coating achieves an outstanding 31.0 dB m 2 at θ = 0°, strongly affirming the ability to effectively attenuate electromagnetic wave in real-world applications. The employed experimental methodology, the meticulously crafted composite, and the simulation outcomes presented in this study bear great promise for the progressive advancement of both theoretical investigations and practical applications within the domain of electromagnetic wave absorption.
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高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Bo-Cai Liu,Wei-Yan Xia,Shang-Qing Wang,Chang-Wei Xu,Zi-Li Liu
Spinel oxide NiCo 2 O 4 firstly has been explored to promote activity of Au for glycerol electrooxidation, which is supported on a three-dimensional hierarchical porous graphene-like carbon (3D HPG) material. Addition NiCo 2 O 4 into the Au/HPG catalyst can significantly improve the catalytic performance for glycerol oxidation. When NiCo 2 O 4 is added to the Au/HPG, onset potential is more 108 mV negatively than that on the Au/HPG. Peak current density on the Au/NiCo 2 O 4 (wt 6:1)/HPG is 5.1 times as high as that on the Au(20wt%)/HPG. The Au/NiCo 2 O 4 in this work shows a great potential as electrocatalyst for glycerol electrooxidation in alkaline medium.
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MATERIALS & DESIGN
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2018
·
IF 4.525
Yajie Chen,Wenchao Zhang,Chunpei Yu,Debin Ni,Kefeng Ma,Jiahai Ye
NiCo 2 O 4 has been selected as an oxidizer to realize the nanothermite film for the first time in this study. The NiCo 2 O 4 /Al core-shell nanowires (NWs) thermite film has been fabricated using a facile hydrothermal-annealing synthesis method and a controllable magnetron sputtering process. The as-obtained NiCo 2 O 4 /Al NWs thermite film shows a uniform structure and distribution on the substrate, with a favorable interfacial contact between the bimetallic oxide and the fuel at the nanoscale . It is found that the quantity of Al plays a key role in the total heat release magnitude. The maximal heat release of the NiCo 2 O 4 /Al nanothermite film has reached 2076.0 J/g at the optimal Al deposited thickness of 450 nm with the obtained optimum Al/NiCo 2 O 4 molar ratio of 4.9. Moreover, this design strategy is highly compatible with microelectromechanical systems (MEMs) and it can be applied to realize other nanothermites composed by bimetallic oxide and fuel.
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Nanoscale
·
2019
·Vol. 11
·期 32
·15166-15172
·
IF 6.97
Yiwen Kuang,Chen Chen,Kai Li,Baicun Hao,Jun Ma,Yang Liao,Hui Mao,Fengwei Huo
Ternary transition metal oxides are promising candidates for developing high-performance lithium-ion batteries. In the present investigation, we explored sandwiched composite nanosheets by encapsulating NiCo2O4 nanoparticles inside the pores of ZIF-67 crystals that were in situ grown on both surfaces of graphene oxide (GO). SEM and TEM observations confirmed the successful construction of the sophisticated architecture. For the designed electrode structure, the scaffold of GO provided a fast conductive highway for the encapsulated NiCo2O4 nanoparticles, while the porous and elastic framework of ZIF-67 together with the flexible GO guaranteed efficient accommodation to the volumetric change of NiCo2O4. Moreover, the highly porous composite nanosheets are suitable for electrolyte infiltration, with enhanced ionic transportation kinetics. Accordingly, the reversible capacity of NiCo2O4@ZIF-67/GO was high up to 1025 mA h g−1 and 740 mA h g−1 after 80 cycles at 0.5 and 2.0 A g−1, respectively. At the current density of 4.0 and 8.0 A g−1, the capacity was still retained at 500 and 320 mA h g−1, respectively. Other analyses further manifested that the distinctive structure of NiCo2O4@ZIF-67/GO enhanced the charge transportation kinetics in comparison with the control sample of NiCo2O4@ZIF-67. Our strategy provided a new concept for developing high-performance electrode materials of lithium-ion batteries.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2017
·
IF 3.133
Haibo Rong,Yanmin Qin,Zhongqing Jiang,Zhong-Jie Jiang,Meilin Liu
In this study, a unique core-shell structural composite with graphene oxide nanosheets wrapping the hierarchical porous NiCo 2 O 4 microspheres (NiCo 2 O 4 @GO) has been successfully prepared by a facile electrostatic assembly process between positively charged hierarchical porous NiCo 2 O 4 microspheres and negatively charged graphene oxide (GO). When used as an anode for lithium-ion batteries (LIBs), the core-shell structured NiCo 2 O 4 @GO can not only suppress the aggregation and large volume change of NiCo 2 O 4 microspheres, but also provide faster kinetics for both electrons and lithium ions during charge-discharge process. Moreover, NiCo 2 O 4 microspheres wrapped with GO can restrict the decomposition of the electrolyte and yielding a stable solid electrolyte interphase (SEI) layer during cycling. Due to these merits, the core shell structured NiCo 2 O 4 @GO hybrid composite demonstrated a high initial reversible capacity of 1046.6 mAh g −1 at a current density of 50 mA g −1 with capacity retention of 77.6% after 100 cycles, the hybrid composite material can still deliver 387.4 mAh g −1 even at a high current density of 4 A g −1 , significantly higher than 187.6 mAh g −1 for the pure NiCo 2 O 4 microspheres. The outstanding electrochemical performance of the core-shell NiCo 2 O 4 @GO hybrid composite demonstrated that it has great potential as high-performance anode material for lithium-ion batteries.
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CARBON
·
2017
·
IF 6.337
Ke Wang,Ying Huang,Mingyue Wang,Meng Yu,Yade Zhu,Jinsong Wu
With the advent of flexible electronics, flexible secondary rechargeable batteries have attracted considerable attentions as a promising power source in the new generation of flexible electronics such as roll-up displays, smart electronics, and implantable medical devices . In this work, we report the fabrication of 3D NiCo 2 O 4 arrays on carbon cloth as a binder-free anode for sodium/lithium ion storage. Amorphous carbon layer is used to modify the surface of NiCo 2 O 4 arrays by physical vapor deposition (PVD). The electrochemical performance measurements demonstrate that the amorphous carbon layer can improve the electrochemical stability of NiCo 2 O 4 . The NiCo 2 O 4 @ C/carbon cloth electrode exhibits a high reversible capacity of 749.9 mAh g −1 , stable cycling with more than 535.47 mAh g −1 at 500 mA g −1 over 100 cycles and impressive rate capability (318 mAh g −1 at 5 A g −1 over 700 cycles) for SIBs and excellent electrochemical performance for LIBs (reversible capacity of 807.63 mAh g −1 were observed for 100 cycles).
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zihan Zhang,Xiaohe Liu,Di Wang,Hao Wan,Ying Zhang,Gen Chen,Ning Zhang,Renzhi Ma
Electrocatalytic water splitting is a critical technique for generating clean hydrogen energy, where the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) are involved. Generally, the OER process (bottleneck step) occurs more favorably in alkaline solution, while the HER process in acidic solution. Structure or composition design of electrocatalyst are effective strategies to achieve high performances for both OER and HER in alkaline environment toward overall water splitting. Herein, we report a unique electrocatalyst composed of RuO 2 nanoparticles on NiCo 2 O 4 nanocones (NCO@RuO 2 -NCs) hybrid structure via the hydrothermal coprecipitation and subsequent calcination. The NCO@RuO 2 -NCs show higher oxygen vacancy density than that of NiCo 2 O 4 @RuO 2 nanosheets (NCO@RuO 2 -NSs). Employing the NCO@RuO 2 -NCs material as a bifunctional catalyst, a low cell voltage of 1.5 V is capable of overall water splitting with excellent stability of sustaining more than 42 h at 10 mA cm −2 in 1 M KOH electrolyte, which is superior to 2.0 V of NCO@RuO 2 -NSs as well as 1.6 V of commercial Pt/C-RuO 2 couple. The current work may provide a scalable and cost-efficient approach for developing advanced nanocomposite catalysts for water splitting.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Ding Zhu,Kuandi Wang,Xiangcun Li,Xinhong Qi,Helong Jiang,Fangyi Chu,Guocui Cai,Qiao Hou,Xuri Wang,Gaohong He
The long-term stability of Li–S batteries is significantly compromised by the shuttle effect and insulating nature of active substance S, constraining their commercialization. Developing efficient catalysts to mitigate the shuttle effect of lithium polysulfides (LiPSs) is still a challenge. Herein, we designed and synthesized a rose-like cobalt–nickel bimetallic oxide catalyst NiCo2O4–OV enriched with oxygen vacancies (OV) and verified the controllable synthesis of different contents of OV. Introducing the OV proved to be an efficient approach for controlling the electronic structure of the electrocatalyst and managing the absorption/desorption processes on the reactant surface, thereby addressing the challenges posed by the LiPS shuttle effect and sluggish transformation kinetics in Li–S batteries. In addition, we investigated the effect of OV in NiCo2O4 on the adsorption capacity of LiPSs using adsorption experiments and density functional theory (DFT) simulations. With the increase in the level of OV, the binding energy between the two is enhanced, and the adsorption effect is more obvious. NiCo2O4–OV contributes to the decomposition of Li2S and diffusion of Li+ in Li–S batteries, which promotes the kinetic process of the batteries.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Yanwei Sui
Herein, we design and construct the hierarchical NiCo 2 O 4 @Ni 0.85 Se core-shell architecture directly growing on Ni foam as advanced materials for supercapacitor . The composite materials deliver excellent electrochemical performance with a high specific capacitance of 1454 F/g and superior cycle life with 88.5% retention after 10000 cycles, which ascribed to the synergistic effect of pure NiCo 2 O 4 and Ni 0.85 Se. Furthermore, the NiCo 2 O 4 @Ni 0.85 Se//AC asymmetric supercapacitor were fabricated with a highest energy density of 29.3 W h kg −1 at power density of 799 W kg −1 . It is expected that the NiCo 2 O 4 @Ni 0.85 Se will be a kind of promising electrode materials for supercapacitor.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 15
·B1653
·
IF 3.12
Duozhe Chen,Shuang Wang,Maoxiang Liu,Juanjuan Gao,Haiou Song,Shupeng Zhang
Bionics-inspired streptococcus-like NiCo2O4 coated needle-like MnO2 architecture has been synthesized successfully, denoted as NiCo2O4-MnO2, and the nonenzymatic electrochemical sensor based on NiCo2O4-MnO2 exhibits highly sensitive determination toward glucose. MnO2 nanowires are regarded as effective nucleation sites, which allows uniformly growing of NiCo2O4 as electrocatalytic centers on its surface by a hydrothermal method. The rational combination of streptococcus-like NiCo2O4 and needle-like MnO2 can effectively prevent the aggregation of nanomaterials due to the formation of 3D network, promote the electron transportation, and provide more electrocatalytic sites. The attractive nanostructure and composition were better confirmed by scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy, etc. The strong coupling of NiCo2O4-MnO2 inspires the synergistic effect, showing a low detection limit of 0.036 μM (S/N = 3) for glucose in 0.1 M NaOH, a high sensitivity of 2887.57 μAmM−1cm−2 and a wide response range (from 1 to 7100 μM). Moreover, the novel sensor exhibited high stability and good reproducibility. The sensor was highly selective to glucose in the presence of commonly interfering species like dopamine, uric acid, ascorbic acid, sodium chloride, fructose, galactose and mannose, and successfully applied to sensing glucose concentration in human serum samples.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Yan Sang,Xi Cao,Lvxuan Wang,Gaofei Ding,Yingjie Wang,Deshuang Yu,Yanan Hao,Linlin Li,Shengjie Peng
Synthesis of highly efficient, non-noble and bi-functional electrocatalysts is exceedingly challenging and necessary for water splitting devices. In this work, three-dimensional spherical Ni(OH) 2 /NiCo 2 O 4 heterojunctions are prepared by a one-step hydrothermal method and the hybrids are explored as efficient electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in an alkaline electrolyte via tuning different Ni/Co atomic ratios of heterojunctions . The optimized Ni(OH) 2 /NiCo 2 O 4 (S (1:1)) exhibits high electrocatalytic activity with an ultralow over-potential of 189 mV at 10 mA cm −2 for the HER. With regard to the OER, the over-potential of the as-synthesized S (1:1) heterojunction is only 224 mV at the current density of 10 mA cm −2 . The improved catalytic performance of the Ni(OH) 2 /NiCo 2 O 4 heterojunctions is attributed to the chemical synergic combining of Ni(OH) 2 and NiCo 2 O 4 , large specific surface area for exposing more accessible active sites, and heterointerface for activating the intermediates that facilitates electron/electrolyte transport. The prepared catalyst exhibits good durability and stability in HER and OER catalyzing conditions. This study provides a feasible approach for the building of highly efficient bifunctional water splitting electrocatalysts and stimulates the development of renewable energy conversion and storage devices.
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