APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Xiaoqin Wang,Qiaoqin Li,Yong Zhang,Yufei Yang,Zhi Cao,Shanxin Xiong
A novel synthesis approach of N-doped porous carbon (NPC)/NiO composites possessing some honeycomb-shaped nanoporous carbon and plentiful NiO nanosheets is exploited. First NPC/Ni composites are achieved with NPC yield of 52.9% through a catalytic pyrolysis method, using coal-based polyaniline particles prepared by an in-situ polymerization method as a carbon and nitrogen source, and nickel particles as a catalyst, respectively. Next NPC/NiO composites are achieved unexpectedly with plentiful NiO nanosheets and N content of 1.00 wt% after a liquid oxidation process. In NPC/NiO composites, porous carbon mainly presents in the amorphous state, while the incorporated nitrogen mainly presents in the form of pyrrolic N (92.9 at.%) and oxidized N (7.1 at.%). Plentiful NiO nanosheets are embedded in the pores or on the NPC surface. 33.3 at.% Ni 2 O 3 components exist in the surface of NiO nanosheets. NPC/NiO composites possess not only rich micropores, but also significant mesopores and nanoscale macropores. The BET specific surface area, BET average pore width and BJH adsorption average pore diameter are 627.5 m 2 /g, 2.0 nm and 5.1 nm, respectively. NPC/NiO composites demonstrate a high specific capacitance of 404.1 F/g at 1 A/g, and a good cycling stability maintaining high specific capacitance of 212.4 F/g (84.3% of the initial capacitance) at 5 A/g after 5000 cycles of charge and discharge, attributed to some honeycomb-shaped nanopores of carbon and large specific surface area of NiO nanosheets, and the synergistic effects between electric double-layer capacitance of NPC and pseudocapacitance of NiO. This study may provide a novel approach for the value-added applications of low-rank coal.
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DOI
高影响因子
TALANTA
·
2018
·
IF 4.244
Yun Zhu,Zezhou Yang,Maoqiang Chi,Meixuan Li,Ce Wang,Xiaofeng Lu
Fabrication of core-shell nanostructured catalyst is a promising way for tuning its catalytic performance due to the highly active interface and rich redox properties. In this work, hierarchical Co 3 O 4 @NiO core-shell nanotubes are fabricated by the deposition of NiO shells via a chemical bath treatment using electrospun Co-C composite nanofibers as templates, followed by a calcination process in air. The as-prepared Co 3 O 4 @NiO core-shell nanotubes exhibit a uniform and novel hollow structure with Co 3 O 4 nanoparticles attached to the inner wall of NiO nanotubes and excellent catalytic activity toward the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H 2 O 2 . Due to the synergistic effect, the peroxidase-like activity of the Co 3 O 4 @NiO core-shell nanotubes is much higher than that of individual Co 3 O 4 and NiO components. Owing to the superior peroxidase-like activity, a simple and rapid colorimetric approach for the detection of dopamine with a detection limit of 1.21 µM and excellent selectivity has been developed. It is anticipated that the prepared Co 3 O 4 @NiO core-shell nanotubes are promising materials applied for biomedical analysis and environmental monitoring.
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DOI
PubMed
高影响因子
ACS Catalysis
·
2025
·
IF 13.1
Yishu Lv,Shuxian Bi,Ziming Ma,Yuan Shu,Pengfei Zhang,Zhenghong Luo
Doping is crucial for regulating oxygen vacancies and improving the catalytic performance in transition metal oxides (TMOs). While prior research has extensively explored the effects of dopant valence and ionic radius, the role of the dopant spatial distribution in determining TMO performance has received limited attention. This study systematically examines praseodymium (Pr) doping in nickel oxide (NiO), with a focus on the spatial distribution of dopants. By precisely controlling the placement of Pr either at the surface or within the bulk lattice, we demonstrate that bulk doping induces lattice distortion, which increases the oxygen migration rates. This enhancement in oxygen mobility results in improved catalytic performance compared with surface doping. The study establishes a structure–activity relationship in doped TMOs and proposes an unexpected strategy for optimizing the catalytic performance through controlled dopant positioning.
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DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Jiashuai Zhu,Lele Zhang,Kang Li
In this work, NiO/NiFe 2 O 4 @Zn 0.76 Co 0.24 S nanocages (NCs) with core-shell type double heterostructures were synthesized using a core-shell design scheme. Among them, NiO/NiFe 2 O 4 cubic cores were obtained by calcination of Ni-Fe Prussian blue analogs (PBAs), and Zn-Co-like zeolitic imidazole frameworks (ZIFs) growed in situ around these cubic cores and were sulfided to obtain NiO/NiFe 2 O 4 @Zn 0.76 Co 0.24 S NCs. The composite has a large specific surface area of 249.66 m 2 g -1 due to the inherited structure of the two bimetallic organic frameworks. And there is a core-shell double heterogeneous synergy between the Zn 0.76 Co 0.24 S NCs and p-p heterostructured NiO/NiFe 2 O 4 , which makes the modified electrode exhibit superior electrochemical performance for Bromisoval (BVU). In addition, glutathione (GSH) was explored to significantly enhance the electrochemical activity of BVU by nucleophilic substitution binding of its own -SH with -Br on BVU, which greatly improved the sensitivity. Then, GSH was developed as a new functional monomer, and beta-cyclodextrin (β-CD) was selected as a secondary functional monomer, and molecularly imprinted polymer (MIP) of BVU was prepared by CV electropolymerization to achieve a specific recognition of BVU. An electrochemical sensor based on NiO/NiFe 2 O 4 @Zn 0.76 Co 0.24 S NCs and MIP was constructed to detect BVU by DPV. Under the optimal conditions, the oxidation peak current of BVU was linear over the concentration range of 0.006-3.5 μM, with the limits of detection (LOD) and quantification (LOQ) of 0.28 nm and 0.933 nm, respectively. The sensitivity reached 11.0303 μA·μM -1 ·cm -2 . The method has a wider linear range and lower detection limits compared to other assays for BVU. And the sensor showed excellent reproducibility, repeatability and stability and had been applied to the determination of BVU in human serum and cosmetics with satisfactory results.
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DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2021
·
IF 4.556
Guangxin Lv,Beichen Shi,Hong Huang,Haodong Chen,Huajie Feng,Pan-Pan Zhou,Weichun Ye,Zhifei Zhang,Zhaoyong Yang
NiO nanoparticles (NPs) with small Ag NPs loading supported on reduced graphene oxide nanosheets (ternary NiO/Ag/RGO nanocomposites) were synthesized via a hydrothermal process followed by high-temperature calcination, extending the synergistic effects among noble metal, metal oxide and carbon materials. Based on ternary NiO/Ag/RGO nanocomposites, a new electrochemical sensor was fabricated for the detection of sunset yellow (SY) in soft drinks through cyclic voltammetry, Tafel plot and differential pulse voltammetry. The experimental conditions were optimized and kinetic parameters studied. Due to the synergistic effect of the ternary components, the prepared sensor exhibited superior electroanalytical performance toward SY detection, including wide linear range from 0.1 to 50 μM and from 50 to 450 μM, low detection limit of 13 nM, excellent specificity against various interfering colorants, good reproducibility and stability. Importantly, the electrochemical sensors was successfully employed for quantitative SY analysis in soft drinks with satisfactory recoveries, where the analyzed results were also in agreement with LC/MS analysis.
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DOI
高影响因子
Advanced Energy and Sustainability Research
·
2022
·Vol. 4
·期 1
·2200151
·
IF 0
Hongming Hou,Taotao Hu,Zetan Zhang,Chang Liu,Qiaofeng Wu,Jin Peng,Jiajun Long,Meng Zhang,Hua Yu
In general, improving the electrical conductivity of bare NiO x film and alleviating the undesired energy level mismatch by interface engineering are operative to enhance the property of 2D perovskite solar cells (2D PSCs) based on NiO x . Herein, the NiO x /2D perovskite interface is modified by inorganic salt KPF 6 to improve the interfacial contact and conductivity of NiO x . It is revealed that KPF 6 not only improves the conductivity of NiO x through the formation of Ni F coordination bond with NiO x by PF 6 - but also promotes the energy level matching between NiO x and the 2D perovskite layer. Thus, KPF 6 -modified NiO x greatly enhances the extraction ability of hole carriers in 2D perovskite layers and improves the crystallinity of 2D perovskite films. Accordingly, the NiO x /KPF 6 -based 2D PSCs attain an optimal power conversion efficiency (PCE) of 14.34%. Meanwhile, the KPF 6 modified device without sealed maintains 93% of its original PCE for 600 h on a 60 °C hot plate filled with nitrogen and 72% after aging for 600 h with a humidity of 35 ± 10% in the atmosphere, respectively. This study demonstrates the effectiveness of using inorganic salts to modify NiO x hole transport layers to augment the optoelectronic properties and stability of 2D PSCs.
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DOI
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 23
·11350-11356
·
IF 3.925
Yanqing Cong,Wanxing Wang,Xiang Chen,Yi Zhang,Shi-Wen Lv
Nowadays, it is a challenging task to achieve the high-efficiency removal of emerging organic pollutants from wastewater. In the current work, a novel Co3O4@NiO-2 composite with great magnetic properties was synthesized by a facile hydrothermal method followed by calcination. Interestingly, the introduction of NiO could improve the specific surface area of Co3O4, while the presence of Co3O4 decreased the charge transfer resistance of NiO. The existence of magnetic properties created more flexibility for the separation and recovery of the catalyst. More importantly, the as-prepared Co3O4@NiO-2 exhibited excellent catalytic performance in PS activation, and the developed Co3O4@NiO-2/PS oxidation system could achieve the effective degradation of various organic contaminants, including TC, BPA, and phenol. During the TC degradation process, radical and nonradical pathways were involved in the PS activation, in which , ˙OH, , and 1O2 were the major active species. Furthermore, it was also noted that the Co3+/Co2+ and Ni3+/N2+ redox couples played a crucial role in PS activation for generating radicals, while the direct electron-transfer process among PS, Co3O4@NiO-2, and TCs was involved in TC degradation. In short, in the current study, not only a high-performance catalyst was synthesized for the PS activation, but also some novel insights for further research on the activation mechanism are shared.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Lanlan Guo,Yanji Feng,Feng Shi,Wei Zhao,Hua Zeng,Tingyu Chen,Yingli Yang,Guodong Wang,Xiaolian Liu,Yan Wang,Xueli Yang
In this work, pure NiO, Al-doped NiO, W-doped NiO and a series of Al/W co-doped NiO nanoflowers were successfully prepared through a simple solvothermal method . Various characterization methods, such as XRD , SEM, TEM, HRTEM and XPS , were used to confirm the physical and chemical properties of the sensitive materials in terms of micro-nano structures, compositions and elemental distributions. The as-obtained Al/W co-doped NiO showed a nanoflower structure with an approximate size of ∼ 200 nm. What's more, among six sensors constructed from the sensitive materials, the sensor based on 3 at% Al 3+ /3 at% W 6+ co-doped NiO (3Al3W-NiO) achieved the highest response (R g /R a =112) toward 100 ppm triethylamine with a low detection limit (1 ppm) at 325 ℃. Besides, this sensor also exhibited excellent response/recovery characteristics and long-term stability. These favorable sensing performances of the 3Al/3 W co-doped NiO sensor are not only modulated by the initial resistance (R a ), but are also closely related to the large specific surface area , porous structures , low crystallinity , rich oxygen vacancies and high Ni 3+ /Ni 2+ ratio in the composite nanomaterials.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Shan Yan,Lina Xu,Jun Jiang,Hongping Xiao,Xinhua Li
Single-material electrodes do not satisfy the demands of high-performance supercapacitors. To exploit the advantages of both oxides and carbon-based materials, a tightly packed Co 3 O 4 /NiCo 2 O 4 /NiO/C&S nanocomposite is fabricated by sintering a Co/Ni-based coordination complex precursor at 400 °C. The composites and basic components are characterized using various techniques, namely, X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy , Brunauer–Emmett–Teller specific surface area analysis, and elemental analysis . The electrochemical performance is analyzed by cyclic voltammetry , galvanostatic charge/discharge cycling, and electrochemical impedance spectrometry . A uniform nanocomposite was found to be formed of NiCo 2 O 4 , NiO, and Co 3 O 4 nanoparticles , incompletely carbonized C, and incompletely vulcanized S. When used as supercapacitor electrodes, the synthesized composites show extra-long cycling stability (>20,000 cycles) during the charge/discharge process. This improvement in the cycle life of the composites is attributed to its highly stable structure. The roles of C and S in forming a stable structure are investigated. The results show that a supercapacitor with electrodes made from the as-prepared Co 3 O 4 /NiCo 2 O 4 /NiO/C&S composite will be promising for commercial applications.
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DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2020
·
IF 0.936
Zi-Yuan SONG,Ying MA,Jian-Shan YE
A novel method for preparation of hybrid material of nickel and nickel oxide (Ni-NiO) nanoparticles doping at the three-dimensional (3D) honeycomb-like surface of carbonated polyvinylpyrrolidone K30 (CPVP) via a one-pot, co-pyrolysis strategy was developed. The morphology and composition of Ni-NiO@CPVP nanocomposite were well characterized by microscopy and spectroscopy, indicating its high specific surface area with the loading of catalytic Ni. These features enable large electrochemically active surface area, rapid electron transfer, especially facilitate the discrimination of analytes which oxidize or reduce at similar potentials. After fixation of Ni-NiO@CPVP composite, the modified electrode exhibited excellent sensing ability towards dopamine (DA), ascorbic acid (AA) and uric acid (UA). Broad liner ranges (5.0–4200 μmol/L, 0.05–75 μmol/L and 0.2–120 μmol/L) and low limits of detection (LODs) (1.0, 0.03 and 0.05 μmol/L) were achieved for AA, DA and UA, respectively. Moreover, this sensor offered a good opportunity for simultaneous profiling of AA, DA and UA with excellent reproducibility, repeatability and long-term stability. The good performance for the measurement of real samples indicated the promising future of this sensor. Finally, the possible sensing mechanism was proposed.
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DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2026
·
IF 4.9
Mochou Gao,Haoxuan Mi,Haocheng Xu,Haowen Ren,Congkai Xu,Zhihao Yang,Chenglin Xu,Haotian Li,Lu Sun,Yanbin Yin,Yanbao Zhao,Wensheng Yang,Xueyan Zou
Hierarchical Fe 3 O 4 @NiO core-shell nanospheres are synthesized. • High adsorption capacity of 65.83 mg/g for His-tagged proteins is obtained. • Fe 3 O 4 @NiO NSs exhibit rapid magnetic separation and good reusability (>80% after 5 cycles). • The adsorption follows pseudo-second-order kinetics and Langmuir isotherm model. Magnetic nanomaterials are highly efficient for the separation and purification of histidine-tagged (denoted as His-tagged) proteins. This article reports the facile synthesis of flower-like magnetic Fe 3 O 4 @NiO core-shell nanospheres (NSs) for that purpose. The synthesis involved the initial solvothermal preparation of Fe 3 O 4 NSs, followed by their controlled reaction with nickel chloride under alkaline condition to in-situ deposit a hierarchical NiO nanosphere shell. The unique hierarchical flower-like architecture could provide abundant accessible Ni 2+ coordination sites for protein binding. When isolating the target protein from cell lysate, Fe 3 O 4 @NiO NSs exhibited a high adsorption capacity of 65.83 mg/g toward His-tagged green fluorescent protein with an equilibrium time of 60 min, together with the merit of fast magnetic separation. Systematic adsorption studies revealed that the adsorption process of the target proteins by Fe 3 O 4 @NiO NSs followed pseudo-second-order kinetics and fitted the Langmuir isotherm model, referring to a chemisorption-dominated monolayer adsorption mechanism. Furthermore, the Fe 3 O 4 @NiO nano-adsorbent exhibited excellent stability and reusability, retaining over 80% of initial separation efficiency after five consecutive adsorption-desorption cycles. Therefore, the hierarchical Fe 3 O 4 @NiO NSs, as a kind of high-performance magnetically recoverable nano-adsorbent, could have significant potential for downstream bioseparation and protein purification applications.
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DOI
高影响因子
ACS Omega
·
2023
·
IF 4.1
Lichen Zhao,Huifang Zhang,Boxiang Ma
Nickel and cobalt oxides are promising electrode materials for supercapacitors, but their poor conductivity and sluggish kinetics seriously hinder their application. Herein, a simple one-step calcination method was proposed to prepare carbon-incorporated NiO@Co3O4 (denoted as CNC) using a NiCo Prussian blue analogue (NiCo-PBA) as a precursor. The effect of calcination temperature on the electrochemical behavior of CNC was investigated. Benefiting from the relatively large specific surface area and porous structure characteristics, when used as an electrode for supercapacitors, the CNC obtained at 400 °C shows the typical features of a battery-type electrode, with a good specific capacitance of 208.5 F g–1 at 1 A g–1 and a rate capability of 70.8% at 30 A g–1. The hybrid supercapacitor (HSC) constructed with the optimum CNC electrode can provide a high energy density of 32.6 Wh kg–1 at the corresponding power density of 750.0 W kg–1 and an excellent cycling stability of 87.1% over 5000 cycles. This study provides a simple calcination method for preparing MOF-derived high-conductivity mixed metal oxide electrode materials for supercapacitors.
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DOI
PubMed
高影响因子
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