Nanoscale
·
2019
·Vol. 11
·期 34
·16071-16079
·
IF 6.97
Zhifang Zhang,Xiaorui Su,Yanyan Zhu,Zhonghui Chen,Zebo Fang,Xiaojing Luo
Exploration of electrode materials with well-defined nanostructures and good flexibility is an efficient approach for achieving high-performance and flexible energy storage systems. However, it is still challenging to well integrate active materials into flexible electrodes and simultaneously maintain satisfactory electrochemical performance. Herein, we successfully synthesize novel three-dimensional graphene (3DG)-encapsulated porous multishelled NiO hollow microsphere (3DG/pMS-NiO) composite aerogels via a modified self-templating method and a dopamine (DA)-assisted self-assembly route. The well-designed highly interconnected porous 3DG network and the close contact NiO–graphene structure of the 3DG/pMS-NiO composite aerogels offer multiple advantages such as high porosity and accessible area, improved conductivity, enhanced electrolyte diffusion and a simple electrode preparation process. Thus, the as-prepared flexible 3DG/pMS-NiO electrodes showed significantly improved specific capacitance of 710.4 F g−1 at 0.5 A g−1 and excellent rate capability with an ultrahigh capacitance retention of 92.5% at 10 A g−1. In addition, the fabricated asymmetric supercapacitors (3DG/pMS-NiO//AC) showed a high specific capacitance of 34.4 F g−1 at 1 A g−1 with a voltage window of 0–1.6 V, a large energy density of 12.3 W h kg−1 at a power density of 815.3 W kg−1, and a decent cycling stability. This work profoundly enlightens the material design and electrode preparation, and even opens up an avenue for the development of high-performance and flexible energy storage systems.
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CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Ning Wang,Yubing Hu,Xiang Ke,Lei Xiao,Xiang Zhou,Shisi Peng,Gazi Hao,Wei Jiang
Nanothermite, due to its high energy density, short ignition delay time, and self-sustained exothermic reaction, is attracting wide attention. In this study, an ammonium hydroxide assisted enhanced-absorption carbon microsphere template method is adopted to prepare double-shell NiO hollow nanospheres with controllable particle size, which further are evaluated as the oxidizers in nanothermite. A possible evolutionary process to form the double-shell NiO is described according to the transmission electron microscopy images at different calcination temperature. The thermal and combustion performances of Al/NiO nanothermite are studied by differential scanning calorimetry, electric ignition and constant-volume pressure cell tests. Results show that as the particle size of NiO hollow nanospheres decreases, the nanothermites show lower activation energy, higher heat release, stronger light intensity, shorter ignition delay time and higher pressurization rate. Based on the optical signal, the combustion process is mainly affected by the mass diffusion distance, depending on the gap between the inner and outer layer. These results indicate that Al/NiO nanothermite has excellent ignition and combustion properties, which are very promising for practical applications in microelectromechanical system (MEMS).
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
·
IF 4.1
Rui Zhang,Jianxun Zhao,Wanqiang Liu,Lianshan Sun,Qingcheng Liang,Peng Chen,Xinwei Wang
Mechanical alloying is used to prepare Co 0.9 Cu 0.1 Si hydrogen storage alloy. Coral-like polyaniline (PANI) and NiO nanoparticles (NiO NPs) are synthesized separately. In order to improve the electrochemical properties of the alloy, polyaniline, NiO NPs and graphene oxide (GO) are doped into the alloy via mechanical alloying to form a composite. The composite material doped with PANI, NiO NPs and GO ultimately demonstrates superior discharge capability compared to the pristine alloy, establishing it as the most high-performing among all samples. The sample doped with both PANI or NiO NPs and GO exhibited superior discharge capacity and HRD performance compared to the sample containing only GO. The Co 0.9 Cu 0.1 Si + PANI/NiO NPs/GO electrode not only demonstrates a remarkable maximum discharge capacity of 590.82 mAh/g, but it also boasts an impressive highest exchange current density of 180.5 mA/g, alongside a notable cycle stability of 61.1 %. The enhancement of electrochemical activity and kinetic performance in alloys is attributed to the synergistic effect exerted by PANI, NiO NPs and GO. GO itself has a high specific surface area and good conductivity, which is conducive to the transfer of hydrogen inside the alloy and enhance the hydrogen storage performance of the alloy. Polyaniline participate in the reversible redox reaction and remain stable during the charge/discharge cycle, which promoted the surface anodizing process of the alloy. The NiO NPs catalyst can effectively weaken the O H bond, facilitating the dissociation of adsorbed water. These factors work together to significantly improve the overall electrochemical hydrogen storage performance of the alloy.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Weidong Nie,Yuanyuan Liu,Jing Li,Meiri Wang,Kaihua Liu,Hongtao Cui
In this work, we choose NiO as an example of battery-type materials. We reveal that the electrochemical destabilization of NiO is attributed to the particle merging caused by electrochemical Ostwald ripening. Based on this understanding, we construct a particulate NiO-composed 2D structure coated by a thin carbon layer. Due to the prevention of particle merging by carbon coating and the increase of electrical and ionic conductivities by oxygen vacancies, this structure presents high electrochemical performance and an ultra-long cycling life. This carbon-coated 2D structure of NiO has a high specific capacity of 437.8 C g −1 at low current density and presents excellent high-rate performance (capacity retention of 66% at high current density). It exhibits ultra-high electrochemical stability (capacity retention of 93.5% after an ultra-long cycling of 100,000 cycles). This work demonstrates the success of carbon modification strategy for NiO, also may provide a significant outlet for transforming low-performance battery-type materials into high-performance materials.
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Materials Today Chemistry
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2025
·
IF 6.7
Le Huy Thai,Le Thi Thanh Nhi,Nguyen Minh Hiep,Dinh Thanh Khan,Trinh Ngoc Dat,Le Vu Truong Son,Le Hoang Sinh
A new all-in-one electrochromic device was demonstrated by employing photocurable methacrylated viologen and polyaniline/UiO-66/NiO/ZnO composite (PUNZ). Methacrylated viologen was dissolved in a photocurable deep eutectic solvent to make electrochromic eutectogel. PUNZ film was electrophoresed on ITO glass and was used as an electrode. UiO-66 can play as an electron donor combined with viologen moieties as electron acceptors to form an electron acceptor-donor complex. ZnO nanoflowers provide fast electron transfer leading to fast switching of the ECD. PANI and NiO can play as ion storage materials, which reduces ion trapping. The ECD with the use of PUNZ film can enhance coloration efficiency, lowering internal resistance, and increase ion conductivity. PUNZ120@ITO-based ECD exhibited a bleaching time 213 times faster than that of the device without using PUNZ film. The optical modulation of PUNZ120@ITO-based ECD maintains up to 95 % after 50 cycles, whereas that of the device without PUNZ film is 46 %.
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International Journal of Environmental Science and Technology
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2024
·
IF 3
Xu X.,Zhu L.,Chen C.,Luo C.,Jin Z.,Sun Z.,Fu Z.T
The study employed a direct hydrothermal method to synthesize NiO/La-KTaO 3 heterojunction photocatalysts. The photocatalytic efficiency of the composites was assessed by their ability to destroy isoamyl xanthate in the presence of Ultraviolet light, mimicking the conditions seen in flotation wastewater. The results showed a significantly greater photocatalytic activity when comparing the composite catalyst to KTaO 3 . A photocatalytic reaction was performed utilizing a 40 mg NiO/K 1−x La x TaO 3 (x = 0.04) photocatalyst at pH = 3. The reaction was carried out using 50 mL of isoamyl xanthate synthesis wastewater, which had a concentration of 20 mg/L. The degradation rate achieved after 30 min was 87.28%. The addition of nickel oxide (NiO) and the introduction of La into the K lattice position were thought to facilitate charge separation, migration, and the generation of additional active sites, hence augmenting the catalytic impact. The findings from radical capture tests indicated that the ·O 2− (superoxide ion) served as the principal active species in the photocatalytic process, playing a substantial role. The process of photodegradation of isoamyl xanthate was determined through the utilization of different analytical and testing methods. This work introduces a direct and effective approach for the eco-friendly decomposition of xanthate flotation wastewater.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Jiawei Hu,Jiaming Li,Zhongyi Pu,Wen Xiao,Huan Yu,Zhihao Zhang,Fang Yu,Chao Liu,Qinfang Zhang
Heterostructured visible-light-responsive photocatalysts represent a prospective approach to achieve efficient solar-to-chemical energy conversion. Herein, we propose a facile self-assembly technique to synthesize NiO nanoparticles/C 3 N 5 nanosheets (NOCN) heterojunctions for hydrogen (H 2 ) evolution catalysis and hydrogen peroxide (H 2 O 2 ) production under visible light. In this regard, the black NiO nanoparticles (NPs) were tightly anchored on the surface of C 3 N 5 nanosheets (CNNS) to construct S-scheme NOCN heterojunction, enabling efficient charge separation and high redox capability. Obtained results elucidated that the incorporated NiO NPs significantly promote light-harvesting efficiency and photo-to-thermal capacity over the NOCN composites. The enhanced photothermal effect facilitates the charge carrier transfer rate across the heterojunction and boosts the surface reaction kinetics. Accordingly, the photocatalytic performances of CNNS for H 2 release and H 2 O 2 production can be manipulated by introducing NiO NPs. The modified photocatalytic properties of NOCN composites are ascribed to the synergistic effects of all integrated components and the S-scheme heterojunction formation. Impressively, the high H 2 evolution photocatalysis efficiency of NOCN nano-catalysts in seawater certifies their potential environmental applicability. Among all, the 12-NOCN nano-catalyst exhibits a higher photocatalytic efficiency for H 2 release (112.2 μmol∙g −1 ∙h −1 ) and H 2 O 2 production (91.2 μmol∙L −1 ∙h −1 ). Besides, the 12-NOCN nano-catalyst reveals excellent recyclability and structural stability. Additionally, the possible mechanism for photothermal-assisted photocatalysis is proposed. This work affords a feasible pathway to design photothermal-assisted S-scheme heterojunctions for diverse photocatalytic applications.
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INORGANIC CHEMISTRY COMMUNICATIONS
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2025
·
IF 5.4
Naeem Akram,Wenlan Ma,Shehla Riaz,Jia Guo,Ali Ahmad,Jide Wang
In this study, Ni-Fe-based Prussian Blue Analogues (Ni-Fe PBA) served as precursors, giving rise to a NiO/Fe 3 O 4 -based bimetallic catalyst that underwent comprehensive examination for both chemocatalytic water oxidation and photocatalytic degradation of organic dyes. The morphologies and chemical compositions of the precursor and resultant bimetallic catalysts were thoroughly characterized using XRD, SEM, XPS, mapping, and FTIR techniques. The results indicated that the catalytically active center is the NiO/Fe 3 O 4 -based bimetallic nanocomposite. The in-situ-synthesized bimetallic catalyst demonstrated remarkable catalytic oxidation activity when evaluated with Sodium Persulfate (PS) as an oxidant. Oxygen evolution results revealed an impressive catalytic water oxidation activity, with an O 2 production rate of approximately 1594.3 µmol·g −1 ·h −1 . Moreover, the NiO/Fe 3 O 4 catalyst was utilized as a heterogeneous photocatalyst to activate photosensitizer (PS) for the two azo dye’s deterioration caused by the exposure to visible light. Both organic dyes were photocatalytically degraded with great efficiency when Fe 3 O 4 and NiO were combined because they increased the catalyst’s capacity to absorb light. Electron Spin Resonance (ESR) and radical trapping studies revealed that sulfate (SO4· - ) and hydroxyl (OH·) radicals played pivotal roles. The degradation mechanism and pathway for Rhodamine B (RhB) were also elucidated. The exceptional recyclability and stability of the NiO/Fe 3 O 4 catalyst make it particularly promising for potential applications in water treatment, addressing challenges related to energy sustainability and environmental toxicity.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Xiaojun Wen,Yiting Liu,Weilong Zhang,Lijun You,Ning Cai,Jumei Li
In this research, we fabricated an innovative NiO/CN/Ag composite through the straightforward electrostatic assembly of Ag nanoparticles and g-C 3 N 4 sheets onto NiO nanoflowers. This composite enables both surface enhanced Raman spectroscopy (SERS) detection and photo-degradation of pesticides. The results reveal NiO/CN/Ag can quantitatively detect thiram (TRM) and diquat dibromide (DQDB) in water, with a limit of detection (LOD) of 10 −9 M, and also exhibit outstanding photo-degradation efficiency, exceeding 95 % for TRM and DQDB within 90 min under simulated sunlight. Significantly, after the organic reagent (citric acid) on NiO/CN/Ag was completely removed through simulated solar irradiation, the signal-to-noise ratios of SERS spectra on NiO/CN/Ag were enhanced, achieving LODs of 10 −8 M for TRM and DQDB in different fruit juices and dried flower teas. Additionally, the composite demonstrate impressive recyclability, maintaining robust SERS signals and high degradation rates even after five cycles of “detection-degradation” processes.
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Nanomaterials
·
2020
·Vol. 10
·期 8
·1502
·
IF 4.324
Yayong Li,Chunxiao Xu,Kaiyuan Liu,Pengwan Chen,Xin Gao
N-doped porous carbon encapsulated NiO/Ni composite nanomaterials (N-doped NiO/Ni@C) was successfully obtained by a one-step solution combustion method. This study demonstrates a one-step combustion method to synthesize n-doped porous carbon encapsulated NiO/Ni composite nanomaterials, using carbon dioxide as the carbon source, nickel nitrate as the nickel source, and hydrazine hydrate as the reaction solution. Spherical NiO nanoparticles with a particle size of 20 nm were uniformly distributed in the carbon matrix. The load of NiO/Ni can be controlled by the amount of nickel nitrate. The range of carbon content of recovered samples is 69–87 at%. The content of incorporated nitrogen for recovered samples is 1.94 at%. As the anode of lithium ion battery, the composite material exhibits high capacity, excellent multiplier performance and stable circulation performance. N-doped NiO/Ni@C-2 was applied to lithium ion batteries, and its reversible capacity maximum is 980 mAh g−1after 100 cycles at the current density of 0.1 A g−1. Its excellent electrochemical properties imply its high potential application for high-performance lithium-ion battery anode materials.Keywords:combustion synthesis;CO2reduction;porous carbon;nickel oxide;hydrazine hydrate;lithium ion battery;nanocomposite
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ChemSusChem
·
2019
·Vol. 13
·期 7
·1890-1899
·
IF 7.804
Jie Zhu,Guolin Cao,Yuan Zhou,Yunjiao Li,Junchao Zheng,Dianwei Zhang
Graphical Spray pyrolysis and a solvothermal method were used to prepare two types of NiO–MnCo 2 O 4 –Ni 6 MnO 8 hybrid anode materials to compare their physical and electrochemical properties. The samples had similar hierarchical nanostructures, but that prepared by the solvothermal method had a smaller and more uniform particle size and larger BET surface area whereas those prepared by spray pyrolysis exhibited more regular morphology and more stable surface chemical states. New materials with different morphologies, nanostructures, and components can have structural advantages for application in materials science. Multicomponent-active hybrid nanostructured materials are among the best candidates for application in electrode materials. Spray pyrolysis and solvothermal synthesis are two popular methods for the preparation of multicomponent-active hybrid nanostructured materials. In this study, the two types of NiO-MnCo 2 O 4 -Ni 6 MnO 8 hybrid anode materials for use in lithium-ion batteries were synthesized by two different methods (spray pyrolysis and solvothermal synthesis), and the differences in their physical and electrochemical properties were compared. The two types of anode material exhibited the same hierarchical hybrid composition, but some different physical characteristics, which affected their electrochemical performance.
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Sustainable Energy & Fuels
·
2022
·Vol. 6
·期 21
·4938-4947
·
IF 6.813
Weiwen Chen,Ziyu Geng,Shicong Zhu,Zenghui Qiu,Xin Zhang,Haijun Xu
Exploration of new MXene-based materials with excellent electrical conductivity and a high redox-active surface as high electrochemical performance supercapacitor electrodes is a very promising field. However, it remains challenging to have electrode materials that feature ultrahigh specific capacitance. In this work, NiO nanoflowers uniformly grow onto a V4C3TX substrate to form a core–shell hierarchical V4C3TX@NiO heterostructure, and then the heterostructure is incorporated into a 3D interconnected porous hydrogel via a hydrothermal graphene oxide (GO)-gelation method at low temperatures. Due to the synergistic effect among each components as well as the significant prevention of the aggregation of V4C3TX, the free-standing V4C3TX@NiO-reduced graphene oxide (RGO) heterostructured hydrogel electrodes exhibit an ultrahigh specific capacitance of up to 1009.5 F g−1 at 1 A g−1, in comparison to those of V4C3TX@NiO (665.3 F g−1) and V4C3TX (184 F g−1), excellent cycling stability (capacity retention rate is 97.4% for the device after 10 000 cycles at 10 A g−1), and a maximum energy density of 61.13 W h kg−1 at a power density of 526.32 W kg−1. This work highlights the unique potential of V4C3TX-based heterostructured hydrogels as inspired electrode materials for low-cost supercapacitor devices.
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