NANO
·
2020
·
IF 1.566
Shi-Wen Wang,Zhen Li,Jun-Peng Ni,Li-Zhen Wang,Yong Zhang,Xiao-Yue Cui,Ke-Zheng Gao,Ji Yan
Spinel structure NiCo 2 O 4 suffers from poor electric conductivity and the resulted electrochemical properties in battery/supercapacitor system are still unsatisfied. In this paper, a free-standing electrode based on in-situ growth NiCo 2 O 4 on carbon cloth has been synthesized by a surfactant-assisted solvothermal method (sodium dodecyl sulfate, SDS). The functional carbon cloth substrate makes unexpected contribution to the electrochemical lithium-ion storage. The assembled supercapacitor possesses ultrahigh pseudocapacitive properties with high mass loading. The specific capacitance of 2832 F g − 1 has been obtained at 1 A g − 1 current density with maintaining the high rate capability of 1620 F g − 1 at 20 A g − 1 . The obtained nanoneedle NiCo 2 O 4 /carbon cloth electrode also maintains a specific capacity of 2000 mA h g − 1 at 40 mA g − 1 and exceptional rate performance (1504 mAh g − 1 at 400 mA g − 1 ) when tested as anode material in lithium ion batteries.
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高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 20
·6876-6883
·
IF 4.174
Zhe Cui,Shu-Ang He,Qian Liu,Rujia Zou
Herein, a simple approach was developed to fabricate novel NiCo2O4 hollow nanoflowers (NCOHFs), which were explored as a sulfur carrier material for lithium–sulfur (Li–S) batteries. Remarkably, the capacity of the NCOHF/S composite electrode was ∼666.8 mA h g−1 in the fourth cycle, which was maintained at ∼432.9 mA h g−1 in the 400th cycle under a current density of 1.0C, with a low decay rate of 0.087% per cycle. The overall outstanding properties of the NCOHF/S composite are attributed to the successful new strategy in structural design via in situ and ex situ procedures. Firstly, NCOHF with bifunctional catalytic activity and chemical adsorption can efficiently promote the redox reactions of lithium polysulfides (LiPSs) and suppress the diffusion of polysulfides. Secondly, NCOHF with inherently high electronic conductivity acts as a conduit to accelerate the transport of electrons and ions. Thirdly, the flower-like NiCo2O4 nanosheets are anchored tightly to the conductive carbon and binder during the Li+ insertion and extraction processes, which can effectively suppress the aggregation of the NCOHF/S composite during cycling. Finally, the hollow space inside the NCOHF/S composite provides sufficient free space for the expansion of encapsulated pure sulfur.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
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2020
·Vol. 126
·期 7
·1-9
·
IF 1.81
Nguyen Hung H.,To Nguyen V.,Tran Thu V.,Nguyen Ky V.,Luong Son T.,Nguyen Nga N. T.,Hoang Chung V.,Nguyen Hieu S.,Nguyen Nghia V.
The NiCo 2 O 4 ternary transition metal oxide (NCO) has been received a great interest as anode material for sodium-ion batteries, recently. Here we show that a composite material composed of NCO nanoparticles (NCO-NPs) and amorphous carbon (NCO/C composite) displayed a superior electrochemical performance over the NCO-NPs. The NCO-NPs delivered a capacity of 172 mAh g −1 at the current density of 50 mA g −1 , and the capacity was reduced to 29 mAh g −1 after 50 cycles. The NCO/C composite showed a capacity of 213 mAh g −1 at 50 mA g −1 ; the capacity was lowered to 119 mAh g −1 after 100 cycles. The capacity of the composite at 100 mA g −1 , 200 mA g −1 and 300 mA g −1 was ca. 123 mAh g −1 , 93 mAh g −1 and 62 mAh g −1 , respectively. This improvement is ascribed to the presence of the activated hard carbon of high electronic conductivity. Our work suggests that the combination of amorphous carbon with the NCO-NPs can serve as anodes for sodium-ion batteries.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Yue Yang,Guo Yong Huang,Hongyu Sun,Mashkoor Ahmad,Qinyao Mou,Hongmei Zhang
NiCo 2 O 4 is a potential anode material for lithium ion battery due to its many advantages, such as high theoretical capacitance, low cost, and good electrochemical activity. In this study, mesoporous NiCo 2 O 4 double-hemisphere (3–5 μm) with high surface area (270.68 m 2 ·g −1 ) and excellent electrochemical performances has been synthesized through a facile precipitation method followed with thermal treatment process. The prepared NiCo 2 O 4 is pure phase and can be indexed as a face-centered-cubic with a typical spinel structure. Electrochemical tests show the prepared material has high specific capacities (910 mAh·g −1 at 100 mA·g −1 ), excellent cyclicity (908 mAh·g −1 at 100 mA·g −1 after 60 cycles) and remarkable high rate performance (after 100 cycles, 585 mAh·g −1 at 400 mAh·g −1 , 415 mAh·g −1 at 800 mAh·g −1 and 320 mAh·g −1 at 1600 mAh·g −1 with coulombic efficiencies of almost 100%). The excellent performances of prepared NiCo 2 O 4 are mainly caused by the unique double-hemisphere structure, which has large surface area, gives material more opportunity to contact with electrolyte and facilitates lithium ion spreading into the material along the radical direction, resulting in a promising application for next-generation lithium-ion batteries.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Ying Liu,Fei Yang,Wei Qin,Guowei Yang
The Co 2 P@NiCo 2 O 4 bi-functional electrocatalyst was fabricated for hydrogen evolution reaction and oxygen evolution reaction in acidic, neutral and alkaline media. The Co 2 P@NiCo 2 O 4 in alkaline media exhibites an extremely low overpotential of 170 mV in oxygen evolution to achieve a current density of 10 mA cm −2 and produces stable water splitting nearly 30 h. The anchored-Co 2 P can enhance the electrochemical performance of pristine NiCo 2 O 4 as well as increase the tolerance in acidic media of NiCo 2 O 4 . Additional, the Co 2 P is oxidized to oxides/hydroxides species during the electrocatalytic reaction , which acts as the active centers of the electrocatalysis . The Co 2 P@NiCo 2 O 4 catalyst can be used as an effective bifunctional synergistic center in a wide range of pH values (from 0 to 14).
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高影响因子
Journal of Physical Chemistry C
·
2015
·
IF 4.772
Feili Lai,Yue-E Miao,Yunpeng Huang,Tai-Shung Chung,Tianxi Liu
Construction of MnO2-based hybrid nanostructures with carbonaceous materials has been considered as one of the most efficient strategies to overcome excessive aggregations of MnO2 particles. Here, a facile approach of growing δ-phase and γ-phase MnO2 with distinctly different morphologies on highly conductive NiCo2O4-doped carbon nanofibers (NCCNFs) through the combination of electrospinning, solution codeposition, and redox deposition methods is presented to form NCCNF@MnO2 nanosheet (or nanorod) core–sheath nanostructures. The obtained two kinds of flexible hybrid membranes with hierarchical nanostructures are both evaluated as electrodes for high-performance supercapacitors. The greatly improved specific surface areas for ionic adsorption, significantly enhanced conductivity of NCCNF, and an open three-dimensional network for rapid electron transportation during the electrochemical processes jointly lead to remarkably enhanced specific capacitances of 918 and 827 F g–1 (based on the active materials) at a scan rate of 2 mV s–1 and good cycling ability with 83.3% and 87.6% retention after 2000 cycles for NCCNF@MnO2 nanosheet and NCCNF@MnO2 nanorod hybrid membranes, respectively. Therefore, this work suggests a novel strategy for design and potential application of MnO2 hybrid materials in high-performance supercapacitors.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Lian-Kui Wu,Jie Xia,Hua-Zhen Cao,Yi-Ping Tang,Guang-Ya Hou,Guo-Qu Zheng
The sluggish kinetics of oxygen evolution reaction (OER) is the most challenging technical problem in water splitting. Here, we reported a new type of cauliflower-like NiCo 2 O 4 (CF-NiCo 2 O 4 ) film which was co-electrodeposited with silica for oxygen evolution reaction. Structure and morphology of the obtained films were characterized using X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscopy and transmission electron microscopy . Electrochemical properties of the CF-NiCo 2 O 4 film were evaluated by quasi-steady state polarization curve , cyclic voltammetry and electrochemical impedance spectroscopy . Results show that the enhanced electrocatalytic activity of the CF-NiCo 2 O 4 film toward OER is a synergistic effect of improved intrinsic catalytic activity and increased surface area.
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高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Jing Li,Jijie Shi,Hui Ren,Junjie Yang,Dan Xiao,Xiaoqin Li,Xinhui Wang,Yong Guo,Zhaoyu Jin
A novel non-enzymatic glucose sensor is developed by directly growing flower-shaped NiCo 2 O 4 microsphere on flexible carbon cloth (NCO/CC) through a one-step electro-deposition with subsequent mild heat treatment. Benefiting from the excellent conductivity between the three-dimensional (3D) structure of NiCo 2 O 4 and CC, as well as the synergic effect between the nickel and cobalt cations, the NCO/CC can not only offer more additional active sites, but also significantly enhance its electrocatalytic performance. Under the optimized conditions, the NCO/CC electrode reveals excellent activity with a broad linear detection range from 10 to 2000 μM, a high sensitivity of 5260 μA mM −1 cm −2 , and a low detection limit (LOD) of 0.2 μM, along with good repeatability and long-term stability. Furthermore, the NCO/CC was successfully utilized to detect glucose in actual beverage samples, showing competitive performance. The straightforward and practical method offers a novel approach to measuring glucose in real-world applications. Novelty statement 3D flower-shaped NiCo 2 O 4 microspheres growing on flexible carbon cloth (NCO/CC) were fabricated by a facile one-step electro-deposition with subsequent mild heat treatment. The fabricated NCO/CC electrode exhibits a wide linear detection range, high selectivity, good reproducibility, and stability towards the detection of glucose.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Bei Xue,Kezhi Li,Shengyue Gu,Leilei Zhang,Jinhua Lu
Nanocrystalline transition metal oxides have attracted a great deal of attention due to their good electrochemical activity. To pursue novel active electrode materials with low detection, high sensitivity and good selectivity for the detection of H 2 O 2 , Ni foam-supported ZnO nanowires and Co 3 O 4 /NiCo 2 O 4 double-shelled nanocages (ZnO/Co 3 O 4 /NiCo 2 O 4 /Ni foam) have been successful fabricated by facile and effective methods When tested as an enzymatic-free H 2 O 2 electrochemical sensor, the obtained ZnO/Co 3 O 4 /NiCo 2 O 4 /Ni foam exhibits fast response time within 5 s, low detection limit of 0.163 μM (S/N = 3), high sensitivity of 0.388 mA mM −1 cm −2 , wide linear range from 0.2 μM to 2.4 mM (R 2 = 0.996), exhibiting good selectivity and long-term stability. The reason is that special structure of the ZnO nanowires could provide direct electrical pathways for the fast electron transport and Co 3 O 4 /NiCo 2 O 4 double-shell nanocages provide abundant mesopores and large specific surface area to enhance the catalytic activity of H 2 O 2 detection. These results suggest that the ZnO/Co 3 O 4 /NiCo 2 O 4 /Ni foam could be considered as a promising electrode material to build electrochemical biosensor.
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高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Yuejie Li,Yan Chen,Xinyue Wang,Khalil Md Ibrahim,Guowen Wang,Xinxin Zhang,Hongchao Ma
Recently, employing photoelectrocatalysis (PEC) strategy to eliminate environmental impact and hazards of hard-to-handle antibiotics such as sulfamethoxazole (SMX) has been given increasing attention. Herein, a “honeycomb” heterostructured α-MnO 2 nanowire/NiCo 2 O 4 hollow nanocages PEC catalyst is fabricated by using a continuous assembly process as following: (1) construction of α-MnO 2 nanowire carrier, (2) surface adhesion of ZIF-67, and (3) Co/Ni ion exchange. The as-synthesized Ti/α-MnO₂@NiCo₂O₄ demonstrated excellent PEC performance for degrading SMX, as compared with that of α-MnO 2 , α-MnO 2 @ZIF-67. Especially, the optimized Ti/α-MnO₂@NiCo₂O₄-30 showed removal rate of 98.2 % for SMX in 30 min, outstanding durability (~8000 s), and tolerable reusability (the removal rate can still reach 76.5 % for SMX after five cycles). The improvement of PEC performance for Ti/α-MnO₂@NiCo₂O₄ can be attributed to that the unique porous structure formed numerous electrochemically active sites, and the α-MnO₂ nanowire as common channel for charge transfer promoted the migration of induced carriers. The DFT calculation indicated that a II-scheme heterojunction can be formed over the α-MnO 2 @NiCo 2 O 4 composite, which can effectively inhibit the recombination of induced carriers, facilitate the degradation process. This work provides a valuable approach for constructing nanohybrids with targeted functionalities, opening new possibilities for the application of nanomaterials in wastewater treatment.
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ACS Sensors
·
2025
·
IF 9.1
Meiling Lian,Kexin Luan,Tianlun He,Da Chen
The integration of gas sensors with small unmanned aerial vehicles (UAVs) has attracted widespread attention in atmospheric chemistry, industrial emission monitoring and environmental protection. However, conventional metal oxide semiconductor gas sensors currently installed on UAVs exhibit issues such as inadequate sensitivity, long response times, and unsatisfactory stability. In this direction, NiCo2O4 inserted two-dimensional layered Ti3C2 MXene have synthesized using a facile hydrothermal method for CO detection. The density functional theory (DFT) calculations were first employed to explore CO adsorption behaviors, revealing that the adsorption energy of gas molecules is significantly reduced after the combination of NiCo2O4 and MXene. The optimized MXene incorporation effectively prevents nanoparticle agglomeration, significantly increasing the specific surface area and exposing abundant active sites for gas adsorption. As a result, the hybrid sensor exhibited more than five times higher response toward 100 ppm CO at 110 °C with shorter response time (39 s) than pristine NiCo2O4. Through in situ Raman spectroscopy analysis, we elucidated the rapid adsorption–desorption of gas molecules on heterostructures. Furthermore, we successfully implemented the developed NiCo2O4/Ti3C2 MXene sensor on a compact drone platform, enabling real-time three-dimensional spatial mapping of CO concentrations. This work not only advances the design of high-performance gas sensing materials but also showcases the practical viability of drone-mounted MXene sensors for real-time 3D air quality mapping, paving the way for smart environmental monitoring systems.
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高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Yalai Cen,Yuelan Fang,Xiaokun Li
High blood pressure is a serious condition that increases the risk of stroke and chronic disease. Amlodipine besylate (ADB), a calcium channel blocker, is employed in the management of hypertension. On this basis, the development of an uncomplicated and stable approach for the detection of ADB is very necessary. NiCo 2 O 4 has a strong structural stability, a large specific surface area, while g-C 3 N 4 has rich surface active sites, based on the advantages of both materials. NiCo 2 O 4 @g-C 3 N 4 nanocomposites were fabricated via a triple-stage hydrothermal synthesis-thermal polymerization-high-temperature calcination method, the material allowed for the creation of an ultrasensitive electrochemical sensor to measure ADB. The redox behavior of ADB at modified electrodes was analyzed using cyclic voltammetry and differential pulse voltammetry. Research shows NiCo 2 O 4 @g-C 3 N 4 /GCE composite electrodes are not easily fall off, have good repeatability, high stability, and strong anti-interference. The composite electrode has a highly sensitive signal response to ADB. At optimal parameters, the linear detection range of ADB on the composite electrode is 0.8–70 μM, with a minimum detectable concentration of 0.026 μM. This sensing platform exhibited reliable performance for real-world sample detection. The proposed method establishes an innovative detection platform for ADB, holding great promise for practical applications.
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