Journal of Advanced Ceramics
·
2021
·Vol. 10
·期 4
·832-842
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IF 6.707
Du Bin,Cai Mei,Wang Xuan,Qian Junjie,He Chao,Shui Anze
Nowadays, metal oxide-based electromagnetic wave absorbing materials have aroused widely attentions in the application of telecommunication and electronics due to their selectable mechanical and outstanding dielectric properties. Herein, the binary ZnO/NiCo 2 O 4 nanoparticles were successfully synthesized via hydrothermal reaction and the electromagnetic wave absorption properties of the composites were investigated in detail. As a result, benefiting from the dielectric loss, the as-obtained ZnO/NiCo 2 O 4 -7 samples possessed a minimum reflection loss value of −33.49 dB at 18.0 GHz with the thickness of 4.99 mm. This work indicates that ZnO/NiCo 2 O 4 composites have the promising candidate applications in electromagnetic wave absorption materials in the future.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2024
·
IF 9.7
Chun Wang,Bai-Hang Zhao,Bao-Yu Zhang,Yi-Hao Zhu,Ye Li
The presence of antibiotics in wastewater threatens the human living environment. Activated peroxymonosulfate (PMS) method is often used for catalytic degradation of antibiotics. However, how to reduce catalyst cost and ensure efficient degradation of antibiotics at the same time is a sticky issue for the activated PMS method. Two-dimensional vermiculite flakes (2D-VMT) is cost-effective and can be used as catalyst carriers for PMS activation. Hence, we exfoliated 2D-VMT from natural vermiculite and prepared NiCo 2 O 4 loaded 2D-VMT (NiCo 2 O 4 /2D-VMT) catalyst. Levofloxacin (LVX), as a normal antibiotic , was used to evaluate the catalytic capacity of NiCo 2 O 4 /2D-VMT in PMS systems. Also, LVX degradation mechanism through NiCo 2 O 4 /2D-VMT activated PMS were explored here. XRD , EDS, TEM, and HRTEM analysis all demonstrated NiCo 2 O 4 nanoparticles were successfully anchored on 2D-VMT. NiCo 2 O 4 /2D-VMT had a high specific surface area and abundant active sites. The NiCo 2 O 4 /2D-VMT/PMS system, with a 15% mass ratio of NiCo 2 O 4 to 2D-VMT (15%-CN/2D-VMT), achieved LVX removal efficiency of 87% and LVX removal rate of 0.034 min −1 . 1 O 2 and SO 4 · - were the major ROS for LVX degradation. The reversible redox cycle between Co(III)/Co(II) and Ni(III)/Ni(II) played a crucial role in activating PMS to generate ROS for LVX degradation process. Also, based on intermediates identification by LC-MS, possible degradation pathways of LVX were proposed and their ecotoxicological evolution was assessed by using the ECOSAR software. 15%-CN/2D-VMT may be a worth recommended loaded catalyst for antibiotics removal in environmental remediation, owing to its high reusability and excellent renewability.
研究领域:
环境科学
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催化材料
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污染治理
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Jingjing Xie,Wei Jiang,Fei Tang,Ying Gao,Hongyu Li,Jiyang Li,Deyang Zhao,Zhiqiang Lv,Zhenglong Yang,Yanbin Xu
La 2 O 3 doped hollow porous Ni/NiCo 2 O 4 /C microspheres (NCO-La) are prepared by solvothermal method. The doping of porous La 2 O 3 nanoparticles is crucial to reduce the crystalline grain size of NiCo 2 O 4 and the internal resistance of the electrode, which facilitates ionic and electronic transportation efficiency. Hollow porous NCO-La microspheres with carbon networks have good mechanical strength and can effectively suppress volume expansion and aggregation. The combination of high-conductivity carbon and metallic nickel improves electronic conductivity. The nanostructure in the composite microspheres brings abundant active sites, which facilitates rapid redox of metal ions and allows rapid insertion and removal of Li + , consequently effectively improving the specific capacity. Benefiting from the synergy of well-designed nanostructure, the material shows high Li + storage performance and good stability. At 0.2 A g −1 after 250 cycles, the discharge specific capacity of NCO-La0.1 (1596.2 mAh g −1 ) is far better than NiCo 2 O 4 (655.6 mAh g −1 ) without La 2 O 3 doping. Such design concept of nanostructures provides a promising way to develop high-performance anode materials for LIBs.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2015
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IF 6.217
Xiangjie Bo,Yufan Zhang,Mian Li,Anaclet Nsabimana,Liping Guo
Three ordered mesoporous carbons (OMCs) with different structures are used as catalyst supports for growth of NiCo 2 O 4 spinel. The high surface area of OMCs provides more active sites to adsorb metal precursors . The porous structure confines the growth of NiCo 2 O 4 and supplies more efficient transport passage for reactant molecules to access the active sites. Due to the structural characteristics of OMCs and catalytic properties of NiCo 2 O 4 , NiCo 2 O 4 /OMCs composites are highly active, cheap, and selective noble metal-free electrocatalysts for the oxygen reduction reaction (ORR) in alkaline solution. The electrochemical activity of NiCo 2 O 4 supported on three OMCs with different structures, surface areas, pore sizes, pore volumes , and defective sites is studied. NiCo 2 O 4 /OMCs composites may be further used as efficient and inexpensive noble metal-free ORR catalysts in alkaline solution.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2021
·
IF 9.028
Weiting Yu,He Jiang,Jinhui Fang,Shuang Song
Reducing the Pd loading on electrodes is critical in the electrocatalytic hydrodechlorination (EHDC) of chlorinated organic compounds (COCs). The EHDC reaction of COCs on Pd involves three steps: H* formation, H* adsorption, and dechlorination. It has been established that the initial hydrogen evolution reaction (HER) occurs on Pd0 and the dechlorination steps occur on Pd2+. A strategy is proposed to design new electrodes by adding a reducible HER-active interlayer to replace Pd0, fulfilling the responsibility of producing hydrogen, and to facilitate the formation of more Pd2+ for following C–Cl bond cleavage. Keeping the atomic hydrogen adsorption energy on the Pd/interlayer similar to that on pure Pd is also necessary for H* adsorption as well as to maintain a high EHDC activity. For the first time, the NiCo2O4-interlayer-modified Pd/Ni-foam electrode was applied in the EHDC of COCs, which enhanced the EHDC efficiency to 100% within 90 min and reduced 88.6% of Pd consumption. The Pd/NiCo2O4/Ni-foam electrode with enhanced EHDC activity was also observed with almost 100% product selectivity and good stability. A synergistic mechanism is proposed for the enhanced EHDC activity on the Pd/NiCo2O4/Ni-foam. This work offers a simple and useful strategy to design robust electrocatalysts for the EHDC of COCs.
研究领域:
化学
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Tao Cong,Xiaoyu Wang,Xifeng Ding
Metal–air batteries, with high energy density and eco-friendliness, are crucial for sustainable energy. Although abundant and low-cost, spinel oxides, ideal for metal–air batteries, suffer from low conductivity, hindering electron transport and slowing electrocatalytic kinetics. In this work, NiCo2O4 (NCO) was embedded on carbon nanotubes (CNTs) via a hydrothermal method to form a composite catalyst (NCO-1CNTs), and subsequent annealing in nitrogen enhanced oxygen vacancy concentration in the spinel structure. In 0.1 M KOH, NCO-1CNTs achieves outstanding oxygen evolution reaction (OER) performance (η10 = 427 mV) and oxygen reduction reaction (ORR) performance (jL = 5.1 mA cm–2), surpassing NCO by 16.6% and 82.1%. The enhanced catalytic activity is attributed to the high conductivity of carbon nanotubes, which accelerates electron transfer. Additionally, carbon nanotubes prevent spinel oxide aggregation, increase active sites, and form a porous structure, enhancing oxygen species transport. Moreover, annealing NCO-1CNTs in a nitrogen atmosphere induces the spinel component to generate more oxygen vacancies, boosting catalytic performance. The resulting zinc–air battery delivers a power density of 68 mW cm–2 and exhibits stable performance over 100 h of charge–discharge cycling. This study delivers a low-cost, high-activity, stable bifunctional cathode catalyst, signaling great promise for commercial rechargeable zinc–air batteries.
研究领域:
材料科学
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电化学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 45
·期 14
·20186-20198
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IF 5.164
Sheng-xue Yan,Shao-hua Luo,Mei-zhu Sun,Qing Wang,Ya-hui Zhang,Xin Liu
Summary The urchin-like NiCo 2 O 4 material was prepared by a one-step hydrothermal method. The optimal synthetic conditions were systematically investigated by an orthogonal test method and single factor of hydrothermal time to evaluate the influence of sample morphology and electrochemical performance. The synthesis conditions for preparing NiCo 2 O 4 with different morphologies were systematically studied. In the single factor experiment, when the hydrothermal time is 6, 12, 16, and 24 hours, the corresponding morphologies are urchin-like (NCO-U), flower-like (NCO-F), sheet-like (NCO-S), and block-like (NCO-B), respectively. The element content of the prepared materials under different synthesis conditions was tested by an inductive-coupled plasma emission spectrometer, and an interesting phenomenon was found. As the reaction time increases, the content of Ni + gradually decreases and the content of Co + gradually increases, which may be one of the factors that affect the morphology and electrochemical performance of the material. The specific capacitances of NCO-U, NCO-F, NCO-S, and NCO-B are calculated to be 914.3, 392.2, 313.3, and 277.4 F g −1 , respectively, at a current density of 1 A g −1 . Benefiting from the large specific surface area and rich oxygen vacancy, the as-fabricated urchin-like NiCo 2 O 4 as electrode materials for supercapacitor demonstrates its promising application potential for supercapacitors.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Zhejiang University-SCIENCE A
·
2020
·Vol. 21
·期 1
·74-84
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IF 1.49
Fang Yang-yang,Wang Xiao-zhong,Chen Ying-qi,Dai Li-yan
The Knoevenagel condensation reaction has wide applications ranging from the manufacture of basic chemicals to pharmaceutical intermediates. In this study, we developed an efficient and magnetic bimetallic NiCo 2 O 4 nanocatalyst by co-precipitation. When used in the Knoevenagel condensation between various benzaldehydes and malononitrile, the catalyst exhibited excellent catalytic performance with 99% conversion and 99% selectivity under mild conditions. It can be easily recovered with a magnet and recycled for 20 runs without significant loss of activity. We expect that the catalyst will find large-scale industrial applications.
研究领域:
催化化学
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纳米材料科学
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有机合成方法学
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绿色化学
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工业催化
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
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IF 6.9
Zhouling Wu,Zhixuan Zhang,Zhiqi Liang,Li Cheng,Shuang Yang,Zhengxing Jiang,Yurong Qi,Zufei Hu,Yang Yang
Crystal plane engineering is an emerging strategy for enhancing the surface activity of catalysts, but there is little research on how crystal planes affect electrochemical non-enzymatic H 2 O 2 sensors. We synthesize four distinct NiCo 2 O 4 nanocrystals with different crystal planes and investigate their impact on electrochemical non-enzymatic H 2 O 2 sensing through a systematic combination of experimental and theoretical approaches. NiCo 2 O 4 nanosheets exposing the {3 1 1} crystal plane (311-NS) demonstrate the highest electrocatalytic activity for H 2 O 2 oxidation, with excellent selectivity, repeatability, reproducibility, and long-term stability. The H 2 O 2 detection performance of NiCo 2 O 4 with is consistent with the total amount of surface Co 3+ and Ni 3+ , indicating that the Co 3+ and Ni 3+ exhibit higher activity for H 2 O 2 oxidation. Our density functional theory calculations attribute the superior sensing performance of 311-NS primarily to its high dangling bond density of Co(III) and Ni(III) and its increased surface energy, both facilitate the oxidation of H 2 O 2 . We additionally construct a 311-NS/rotating disk electrode sensor that detects H 2 O 2 in real samples with accuracy comparable to that of high-performance liquid chromatography, highlighting its potential for applications in environmental monitoring and food safety. This study not only broadens our understanding but also demonstrates that selective exposure of specific crystal planes enhances electrochemical non-enzymatic H 2 O 2 sensing performance, an insight to guide development of future peroxide sensors.
研究领域:
材料科学
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电化学
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传感器技术
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 29
·11509-11515
·
IF 0
Feng Cai,Yiran Kang,Hongyuan Chen,Minghai Chen,Qingwen Li
The mass integration of electrochemically active materials on nanosized conductive fillers is a promising strategy to achieve an ideal electrode structure for energy storage devices. In this research, a one-dimensional CNT@NiCo2O4 nanosheet core–shell structural nanocable was constructed by a facile chemical co-deposition route combined with post-calcination in air. The subsequent thermal treatment led to the transformation of the hydroxide nanosheet precursor to NiCo2O4 nanosheets, during which process the overall morphology and structure were well retained. By selecting CNTs as conductive support for ultra-thin NiCo2O4 nanosheets, a high-performance electrode for supercapacitors was obtained. Notably, the as-prepared CNT@NiCo2O4 nanocables have a high capacitance of 1038 F g−1 at a current density of 0.5 A g−1. Furthermore, the specific capacitance of the product was almost 100% retained after 1000 cycles, which indicates excellent structural and cycling stability. More importantly, a relatively high mass loading of active materials on CNTs was also achieved, making the practical application of such electrode materials possible. Consequently, this CNT@NiCo2O4 nanocable is a promising electrode for high-performance supercapacitors.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
FUEL
·
2022
·
IF 8.035
Hua Yang,Xingchuan Yang,Jieyu Xiao,Yi Yu,Li Xu,Xingang Li,Chunmei Cao,Guoji Liu
Highly active spinel-derived monolithic catalysts loading Ag (xAg/NiCo-NS) have been successfully designed and synthesized and used to catalytic soot elimination. The crossed macro-porous of NiCo 2 O 4 nanosheets and the three-dimensional porous structure of Ni foam not only provides a convenient gas mass transfer channel, but also provides a large number of contact points between soot and catalyst. After loading Ag on the NiCo-NS, the catalytic performance for soot oxidation is improved remarkably. Among the xAg/NiCo-NS catalysts, the 4.5Ag/NiCo-NS sample has the highest catalytic performance with the lowest T 50 (333 °C), which is 50 °C lower than that of the NiCo-NS catalyst and lower than that of other prove metal catalysts (Pt/Pd/Au) in the atmosphere of 500 ppm NO/10 % O 2 /N 2 . The metal-support interaction between Ag and NiCo-NS weakens the Co-O bond, increases the amount of surface oxygen vacancies and improves the intrinsic activity determined by turnover frequency (TOF) of the catalyst. Moreover, Ag can also adsorb and activate gaseous oxygen to produce the low-temperature active oxygen species (O 2 − ), which can promote the soot combustion in the low temperatures. Based on the catalytic performance for soot oxidation and activation Energy (Ea), the reaction paths for the catalytic combustion of soot on Ag/NiCo-NS are identified.
研究领域:
材料科学
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环境科学
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催化化学
✓ 已验证
产品关联
DOI
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.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）