JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Chengcheng Ma,Wei Wang,Qi Wang,Ning Sun,Songqing Hu,Shuang Wei,Huimeng Feng,Xiangping Hao,Wen li,Debao Kong,Shihe Wang,Shougang Chen
A three-dimensional hollow NiCo 2 O 4 structure was successfully prepared with a precipitation-hydrothermal method. A balance between magnetic and dielectric losses was achieved by using a hollow NiCo 2 O 4 structure loaded with benzotriazole (BTA), and thus the performance of electromagnetic waves was attenuated. The minimum reflection loss value of BTA@NiCo 2 O 4 at 16.01 GHz was −35.39 dB when the absorber thickness was 2 mm, at which the absorption bandwidth for an RL of less than −10 dB is as high as 4.64 GHz. The absorption mechanism was characterized by the synergy among interfacial polarization, multiple reflection, and dipole polarization enhancement between NiCo 2 O 4 and BTA . Interestingly, the epoxy/BTA@NiCo 2 O 4 coating not only exhibited an outstanding microwave absorption (MA) performance but also has excellent anticorrosion and self-healing properties, as shown by the results of electrochemical impedance spectroscopy and confocal laser scanning microscopy. This work would be very helpful to the development of novel coatings with excellent MA performance and anticorrosion and self-healing properties.
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PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2020
·Vol. 7
·期 21
·4101-4112
·
IF 5.958
Chen Han,Wen-Qiang Cao,Mao-Sheng Cao
Significant capacity degradation and a dramatic volume change call for effective strategies to address the intrinsic issues of transition metal oxide anodes of lithium-ion batteries. Rational nanostructural design has shown great promise in improving structural stability and electrochemical performance. We here report the fabrication of hollow nanoparticle-assembled hierarchical NiCo2O4 nanofibers via a facile electrospining technique and annealing process. A set of control experiments and systematic characterization demonstrate that the presence of polymers and an appropriate annealing procedure are key to form a novel nanostructured anode. The hollow nanostructure and abundant mesopores centered at about 20 nm in the nanofibers could effectively suppress severe volume variations in the lithiation/delithiation process. Furthermore, the novel nanoparticle-nanofiber hierarchical architecture could shorten the lithium diffusion length, increase the contact areas between the electrode and electrolyte, and accordingly promote fast electron/charge transfer. As expected, the optimized hierarchical NiCo2O4 nanofibers exhibit excellent performance for Li-ion batteries, delivering a capacity of 926.2 mA h g−1 at 0.1 A g−1 and 687 mA h g−1 at a high current density of 2 A g−1. This work may provide an attractive and promising strategy for advancing transition metal oxide anodes.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2021
·
IF 4.641
Ling Li,Zeyuan Ma,Lu Liu,Xiaohui Wang,Jianguo Wang,LiYe Cao,Shuang Liu,Wenming Zhang
Herein, a composite of carbon fibers coated with bimetallic oxide NiCo 2 O 4 are successfully synthesized by combination of electrospun and hydrothermal methods and applied as counter electrode (CE) catalytically for dye-sensitized solar cells (DSSCs). SEM images show the homogeneous distribution of NiCo 2 O 4 nanosheets on the surface of CNFs, which provides enough active centers for electron collection and transmission and makes larger surface area. More importantly, the NiCo 2 O 4 /CNFs CE exhibits high efficiency and electrochemical stability, of which the short circuit current density ( J sc ) reachs 17.11 mA cm −2 . Due to the employment of NiCo 2 O 4 /CNFs composite as CE, the photoelectric conversion efficiency has achieved 7.80%, obviously higher than those of CNFs (5.75%) and Pt (7.35%).The cost-effective NiCo 2 O 4 /CNFs composite may be used to replace the conventional Pt CEs alternatively.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Bin Han,Jianing Song,Shujie Liang,Weiyi Chen,Hong Deng,Xinwen Ou,Yi-Jun Xu,Zhang Lin
CO 2 adsorption is a critical step for CO 2 photoreduction, especially in diluted CO 2 , whereas an in-depth understanding of CO 2 adsorption effects is still lacking. Herein, isostructural NiCo 2 O 4 and MgCo 2 O 4 hierarchical hollow nanocages (NiCo 2 O 4 HCs and MgCo 2 O 4 HCs) have been ingeniously constructed for diluted CO 2 photoreduction. NiCo 2 O 4 HCs exerts an apparent quantum yield of 1.56% with CO selectivity of 89%, exceeding most previous inorganic catalysts in pure CO 2 . Nevertheless, MgCo 2 O 4 HCs is almost inert, even though it shows higher CO 2 uptake ability. DFT calculations results indicate that CO 2 molecule adsorbed on Ni sites can be readily reduced to CO, while the CO 2 on Mg sites cannot participate in this reaction. Therefore, only adsorbed CO 2 which can participate in reduction reactions, named active adsorption , can accelerate the whole reactions. This work unearths atomic-level insights into the relation between CO 2 adsorption and reduction, providing fundamental guidance to improve photocatalytic performance.
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高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Jingwen Shen,Qiguan Wang,Kai Zhang,Sumin Wang,Lu Li,Shibo Dong,Shaoting Zhao,Jian Chen,Risheng Sun,Yan Wang,Zengyun Jian,Wenzhi Zhang
Based on carbon cloth, flexible solid-state supercapacitors from bimetal oxide arrays of NiCo 2 O 4 @NiMoO 4 deposited by conductive polymers of polyaniline (PANI) are prepared employing a two-step hydrothermal reaction , followed by high-temperature annealing and an in-situ polymerization process. The presence of NiMoO 4 nanoplates prepared on NiCo 2 O 4 nanowhires leads to the hierarchical flower-like nanostructures . In order to further enhance the conductivity and wettability, NiCo 2 O 4 @NiMoO 4 is coated by the three-dimensional networks of PANI nanorods by means of the in-situ polymerization of aniline, the obtained NiCo 2 O 4 @NiMoO 4 /PANI nanocomposites illustrate a specific hierarchical holothurian-like morphology, which facilitates the adsorption and penetration as well as the rapid transportation of electrolyte ions within the nanopores in the active electrode materials , resulting in excellent electrochemical performances. The specific areal capacitance of the flexible carbon cloth-based electrodes reaches 2.38 F cm −2 at current density 1.0 mA cm −2 , and the capacitance retention is 92.36% of the initial value after 5000 cycles, which finds applications in flexible and wearable devices.
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Materials Chemistry Frontiers
·
2018
·Vol. 2
·期 6
·1155-1164
·
IF 0
Zhen Chen,Bo Zhao,Ya-Chuan He,Hao-Ran Wen,Xian-Zhu Fu,Rong Sun,Ching-Ping Wong
NiCo2O4 nanoframes with a nanosheet surface are fabricated using Cu2O nanoframes as a template. The size of the NiCo2O4 nanoframe is about 450 nm, and the thickness of the surface nanosheet is about 10 nm. Compared with Co3O4 and NiO nanoframes, NiCo2O4 nanoframes as electrocatalysts demonstrate much higher catalytic activity and stability for the oxygen evolution reaction (OER). The superior electrocatalytic performance of NiCo2O4 nanoframes might be attributed to the large surface area and synergistic effect of Ni and Co.
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NANOTECHNOLOGY
·
2016
·Vol. 28
·期 2
·025501
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IF 3.573
Bingrong Wang,Yang Cao,Yong Chen,Xiaoyong Lai,Juan Peng,Jinchun Tu,Xiaotian Li
NiCo2O4 nanospheres, a type of conjugated reduced graphene oxide (rGO), are compounded by a simple and easy synthesis of Cu2O/GO and fabricated NiCo2O4/rGO nanocomposites based on a Cu2O/GO template. The structure and morphology of the hierarchical NiCo2O4/rGO are characterized by x-ray diffraction, x-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. The electrochemistry properties of NiCo2O4/rGO composites toward glucose are determined based on a glassy carbon electrode, and the results indicate that the hollow nanospheres of NiCo2O4/rGO could achieve high-sensitivity detections of glucose. The NiCo2O4/rGO composite has a detection range of 0.04 mM to 1.28 mM, a sensitivity of 2082.57 μA mM−1 cm−2, and a detection limit of 0.7 μM. The composite further exhibits obvious stability, superior reproducibility, and excellent selectivity. This study demonstrates that NiCo2O4/rGO is a unique and material with high potential in glucose sensing.
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高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Peng-jie Zhu,Fang-yuan Su,Li-jing Xie,Xiao-Ming Li,Yong-feng Li,Cheng-Meng Chen
Research into environmentally friendly energy storage devices is a vital strategy to address the energy crisis and environmental pollution challenges. In this paper, oxygen-rich vacancy Co 3 O 4 /NiCo 2 O 4 heterojunction hollow nanocage electrodes were synthesized by a two-step hydrothermal and calcination method. Taking advantage of its unique structure, oxygen vacancies, and the synergistic effect of multi-element transition metal oxides, the electrode has good conductivity, high specific surface area, and abundant active sites. As a result, the Co 3 O 4 /NiCo 2 O 4 HHNCs electrode exhibits an ultra-high specific capacitance of 1788F g −1 at 1Ag -1 , and the assembled hybrid supercapacitor has an energy density of up to 43.9 Wh kg −1 , which is promising for applications in energy storage materials.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Linhai Wang,Kun Jiang,Zhijin Wang,Tao Li,Duo Wang,Yun-Quan Liu
With ammonia playing a more and more vital role in serving as a renewable hydrogen carrier, it is critical to develop economical and efficient electrocatalysts for the ammonia oxidation reaction (AOR) in which hydrogen is released. In this work, a heterostructured electrocatalyst, Ni 3 S 4 @NiCo 2 O 4 /NF, was synthesized using the hydrothermal method for the purpose of improving AOR efficiency. The obtained nano catalyst exhibited an excellent AOR activity (10 mA·cm −2 at 0.58 V vs. Hg/HgO) and stability (37.2 h at 100 mA·cm −2 ). XRD and XPS characterizations indicated that the bulk catalyst remained unchanged yet with surface metallic Ni oxidized. In situ Raman spectroscopy analysis further revealed that the heterostructured catalyst underwent an obvious surface reconstruction process (Ni(OH) 2 → β-NiOOH → γ-NiOOH) which accordingly lowered the potential required for reconstruction and optimized the energy barrier for the AOR. DFT calculations showed that the heterostructured catalyst not only favors the acceleration of the reconstruction process due to electronic interactions, but also reduces the energy barrier in *NHNH 2 generation step, thus enhancing the performance of AOR, which is superior to the other two catalysts. The product gas analysis showed that the developed catalyst maintained an excellent Faraday efficiency of 95% and a continued activity. In summary, this work opened a potential new pathway for the design of heterostructured electrocatalysts for H 2 production through AOR.
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高影响因子
Journal of Analysis and Testing
·
2024
·Vol. 8
·期 2
·170-179
·
IF 5.5
Chen Jia,Long Zerong,Li Yan,Qiu Hongdeng
The establishment of a low-cost and facile approach for the assay of acid phosphatase (ACP) and its inhibitor is a research focus. In this paper, we successfully synthesized NiCo 2 O 4 nanosheets with peroxidase-mimicking activity in alkaline deep eutectic solvents (DESs) composed of NaOH and PEG-200, which can catalyze 3,3′,5,5′-tetramethylbenzidine (TMB) to the oxidation state TMB (ox-TMB) in the presence of H 2 O 2 . Due to L-ascorbic acid-2-phosphate can be hydrolyzed into ascorbic acid by ACP, the peroxidase-like activity of NiCo 2 O 4 nanosheets is inhibited. However, the addition of malathion, an inhibitor of ACP, can inhibit the activity of ACP and thus limit the production of ascorbic acid (AA). Therefore, a colorimetric approach can be established for highly sensitive and selective detection of ACP and malathion with detection limits of 0.032 U/L and 0.65 nmol/L, respectively. More importantly, this method can be successfully applied to malathion detection in environmental samples tap water and food cucumber juice, indicating that it has potential application prospects in environmental and agricultural fields.
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Catalysts
·
2019
·Vol. 9
·期 4
·352
·
IF 3.444
Dongdong Wang,Shuangde Li,Yingchao Du,Xiaofeng Wu,Yunfa Chen
Rational design LDHs (layered double hydroxides) with 3D hierarchical hollow structures have generated widespread interest for catalytic oxidation due to the high complexity in shell architecture and composition. Herein, we reported a handy two-step method to construct a 3D hierarchical NiCo2O4/NiO nanocage. This synthetic strategy contains a partial in situ transformation of ZIF-67 (zeolitic imidazolate framework-67) into Co-NiLDH yolk-shelled structures following ethanol etching, and a structure-preserved transformation from Co-NiLDH@ZIF-67 to a biphase nanocage following calcination. CoNi-yh-T (varied reaction time and calcination temperature) nanocages were investigated systematically by Brunauer–Emmett–Teller (BET), X-ray photoelectron spectroscopy (XPS), H2- temperature-programmed reduction (TPR), NH3-temperature-programmed desorption (TPD) and studied for toluene oxidation. The CoNi-6h-350 sample showed much higher activity with 90% toluene conversion (T90) at 229 °C at a high space velocity (SV = 60,000 mL g−1h−1) than other catalysts (T90>240 °C). Abundant surface high valence Co ions caused by the novel hierarchical nanostructures, together with adsorbed oxygen species and abundant medium-strength surface acid sites, played a key role for catalytic activities.
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高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 17
·5845-5852
·
IF 4.39
Zhaowu Li,Xin Yin,Lixin Song,Wei-Hsiang Chen,Pingfan Du,Ni Li,Jie Xiong
Inorganic p-type semiconductors have broadly served as hole transport materials (HTLs) in perovskite solar cells (PSCs) in recent years. Among them, NiCo2O4 with its excellent conductivity and hole mobility is the emerging candidate for HTLs and is attracting increasing attention. Here, we employ a simple hydrothermal method to fabricate high-quality mesoporous NiCo2O4 films as HTLs of PSCs. The study finds that the morphology of NiCo2O4 can be regulated from nanosheets (NSs) to nanowires (NWs) as the hydrothermal reaction time increases, and the morphology of NiCo2O4 significantly affects the device performance. Specially, the device with NWs achieves a best efficiency of 11.58%, ascribed to the fact that such a one dimension material could provide a straight path for hole extraction/transport. And benefiting from the mesoporous structures of NiCo2O4 films, all the devices exhibited a very repeatable and desirable long-term stability. Overall, this work develops alternative NiCo2O4 nanostructure-based HTLs and opens up new opportunities in fabricating PSCs.
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高影响因子
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