APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Linyun Zhang,Shanxin Li,Lihong Duan,Xuzhou Jiang,Yijing Sun,Hongying Yu
Core-shell structural design is an attractive strategy to achieve high-performance microwave absorbers. Nevertheless, it still remains a problem to simultaneously obtain superior microwave dissipation and impedance matching for microwave absorption (MA) materials. In this work, ZnO-NiCo 2 O 4 -NiCo 2 O 4 (ZNN) core–shell microstructure is designed and fabricated by covering NiCo 2 O 4 nanosheets on the surface of ZnO nanorod and next growth of NiCo 2 O 4 nanoparticles. With the synergies from the NiCo 2 O 4 nanosheets improving the microwave attenuation capability and the NiCo 2 O 4 nanoparticles increasing the impedance matching, ZNN possesses efficient MA performance: the strongest reflection loss is −59.93 dB at the corresponding thickness of 2.6 mm, and the maximum absorption bandwidth is 7.04 GHz at 2.4 mm, which covers the entire Ku-band. RCS simulation also indicates that ZNN has outstanding MA performance. Moreover, this study proposes a point for the utilization of nickel–cobalt oxides in MA materials, and offers a reference for the design of core–shell structural absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Yanying Wang,Zhaoyi Zhang,Xin Liu,Fang Ding,Ping Zou,Xianxiang Wang,Qingbiao Zhao,Hanbing Rao
We developed a hydrothermal synthesis and high temperature calcination method to synthesize the metal–organic framework (MOF)-derived NiCo2O4/NiO and NiCo2O4/NiO-rGO. These composites were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Brunner–Emmet–Teller measurements. This work combines excellent catalytic efficiency of the transition metal with large specific surface area and large number of pores of the MOF. Consequently, catalysts for oxygen evolution with high efficiency and low cost were obtained. Both materials show lower overpotential at 430 and 350 mV, respectively, under 10 mA·cm–2. The Tafel slopes are 49 and 66 mV·dec–1, respectively, with very small performance attenuation for long-term catalytic reaction. Therefore, the catalysts reported herein possess great potential for application in oxygen evolution reaction.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers of Materials Science
·
2025
·Vol. 19
·期 3
·1-12
·
IF 2.3
Li Guofu,Sun Yuhua,Dong Yuchi,Chen Di,Hu Jing,Sun Mizhen,Yuan Jinxiu,Zhou Ziyan,Xie Guoqiang,Feng Lijuan,Zhang Yingchao,Chen Yingjie,Yu Liyan,Dong Lifeng
Incorporating a secondary metal and engineering heterogeneous nanostructures can significantly enhance the electrochemical performance of non-enzymatic glucose sensors. Herein, NiCo 2 O 4 nanowire (NW) arrays were enveloped with NiCo 2 O 4 nanosheets (NSs) using a simple hydrothermal method. NSs improved the electronic conductivity of NW arrays, while arrays prevented the aggregation of NSs, resulting in exceptional glucose sensing performance. In 0.1 mol·L −1 NaOH electrolyte, this composite electrode demonstrated remarkable sensitivity (7641 µA·mmol −1 ·L·cm −2 ), broad linear detection range (1 to 1250 µmol·L −1 ), low detection limit (0.16 µmol·L −1 ), and rapid response time (within 1 s), as well as excellent selectivity, reproducibility, and stability. Such a unique architecture of NiCo 2 O 4 NW arrays enhanced the specific surface area of the composite material, facilitating the efficient electron transfer between copper foam and NiCo 2 O 4 NSs. This work provides an economical and efficient approach for developing enzyme-free glucose sensing catalysts with superior electrochemical properties.
研究领域:
电化学
·
纳米技术
·
分析化学
·
生物传感器
✓ 已验证
DOI
高影响因子
IONICS
·
2023
·Vol. 29
·期 7
·2925-2933
·
IF 2.8
Wang Lu,Li Jingjing,You Junhua,Wang Zhiwei,Qi Xiaojing,Xu Jingsheng
NiCo 2 O 4 /NiMoO 4 hierarchical composite structure is used for high-performance supercapacitors electrode materials. The electrode material is grown directly on the conductive carbon cloth, which effectively reduces the contact resistance between the collector and the active material, and provides a favorable skeleton structure for NiCo 2 O 4 /NiMoO 4 . In this work, NiCo 2 O 4 /NiMoO 4 electrodes were prepared under optimal conditions of primary hydrothermal time of 12 h, annealing temperature of 350 °C, and secondary hydrothermal time of 8 h. The optimized hierarchical NiCo 2 O 4 /NiMoO 4 electrode exhibits a high areal capacitance of 3.85 F·cm −2 (at a current density of 4 mA·cm −2 ) and better cycle stability than the NiCo 2 O 4 and NiMoO 4 electrode, respectively. The constructed asymmetric supercapacitor NiCo 2 O 4 /NiMoO 4 //AC has a satisfactory energy density of 38.69 Wh·kg −1 at 228.56 W·kg −1 power density. At the current density of 4 mA·cm −2 , ASC devices still have a capacity retention rate of 90.88% after 5000 cycles, indicating their potential application in energy storage devices.
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
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Shuang Wang,Shupeng Zhang,Maoxiang Liu,Haiou Song,Juanjuan Gao,Yueyue Qian
A novel MoS 2 -NiCo 2 O 4 architecture with highly sensitive determination toward glucose is constructed successfully in this work. MoS 2 nanosheets are regarded as clever connectors to connect NiCo 2 O 4 nanoplates together, which would inspire the electrocatlytic performance of NiCo 2 O 4 nanoplates acted as active sites greatly. The interesting nanostructure and composition were confirmed by scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy, etc. Rational incorporation of MoS 2 as an electron collector can promote the formation of conductive chains among the NiCo 2 O 4 nanoplates, accompanying with inhibiting of NiCo 2 O 4 aggregation. The conductive path can accelerate the charge transfer significantly. The MoS 2 -NiCo 2 O 4 modified GCE exhibits enhanced electrocatalytic activity toward the oxidation of glucose, compared with NiCo 2 O 4 nanoplates. At a potential of +0.418 V, the fabricated biosensor demonstrates a wide detection range with high sensitivity (1748.58 μAmM −1 cm −2 ) and a low detection limit of 0.152 μM. It also shows anti-interference for ascorbic acid, uric acid, dopamine and chloride ion. Besides, it owns good reproducibility, repeatability and long-term stability. Excellent catalytic oxidation performance for glucose supports that MoS 2 -NiCo 2 O 4 hybrid is an outstanding and promising electrode material toward glucose biosensor.
研究领域:
材料科学
·
生物传感器
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Song Wei,Caichao Wan,Luyu Zhang,Xinyi Liu,Wenyan Tian,Jiahui Su,Wenjie Cheng,Yiqiang Wu
Transition-metal oxides are a class of promising pseudo-capacitive materials for high energy density supercapacitors, while their low intrinsic conductivity, limited electrochemical sites and remarkable volume expansion deteriorate the electrochemical properties. Herein, we develop a facile synchronization strategy to prepare a N-doped and oxygen vacancy-rich NiCo 2 O 4 microporous nanograss (N–Ov–NCO MiNG), with adjustable superficial nanoporous architecture and electronic structure. Because of the instructive synergy of doping, defect, and surface-engineering achieved by one-step plasma activation, the optimum electrode (N–Ov–NCO MiNG–15) for supercapacitors exhibits significantly enhanced electrochemical properties, like an ultra-high specific capacitance of 2986.25F g −1 at 1 mA cm −2 and outstanding cyclic stability with a capacitance retention of 96.5% after cycling for 12,000 times. In addition, an aqueous asymmetric supercapacitor (ASC) device, assembled with the N–Ov–NCO MiNG–15 as the cathode and commercial activated carbon (AC) as the anode, shows an extremely high energy density of 103.2 Wh kg −1 at the power density of 748.3 W kg −1 , superior to most state-of-the-art supercapacitors and thus exhibiting a great potential in practical applications.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2024
·
IF 1.3
Lin Zhu,He-ying Xia,Chun-yong Zhang,Ying Geng,Zhe Li,Li Shu,Ji-rong Bai,Ying-pin Wen
As a new type of efficient electrochemical energy storage system, the supercapacitor serves as an effective means to support the development of clean energy, with the electrode material being the key determinant of performance. The electrode material Pt-NiCo 2 O 4 /C was prepared in this paper by stepwise hydrothermal and calcination methods using ZIF-67 as a template, aiming to improve specific capacitance performance and stability. Pt-NiCo 2 O 4 /C achieved a specific capacitance of 1665.3 F/g at a current density of 1.0 A/g, and maintained 94.49% of the original specific capacity after 3500 cycles at a current density of 4.0 A/g. The excellent specific capacitance performance of the Pt-NiCo 2 O 4 /C electrode material makes it a promising potential candidate for energy storage applications.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
ChemCatChem
·
2018
·Vol. 10
·期 23
·5533-5540
·
IF 4.674
Xiaoqiang Du,Jianpeng Fu,Xiaoshuang Zhang
Graphical Foaming at the mouth of the catalyst : NiCo 2 O 4 @NiMoO 4 core−shell hybrid nanostructure was successfully prepared by hydrothermal calcination method. The nanostructure is a low cost and relatively stable electrocatalytic water splitting catalyst. The NiCo 2 O 4 @NiMoO 4 /NF-8 h nanorod electrode shows excellent electrocatalytic activity with a low voltage 1.55 V and stability with long hour electrolysis, which is highly satisfactory for a prospective bifunctional electrocatalyst. Splitting water to make hydrogen is one of the most effective ways to solve the energy crisis. In this paper, we started with the catalysts of the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) of electrocatalytic water splitting, studied the catalysts with great stability and practicality, and designed NiCo 2 O 4 nanowires as precursors, on whose surface we set NiMoO 4 nanosheets. Cobalt elements were introduced on the nickel foam with electrocatalytic properties, and a flower-like NiCo 2 O 4 @NiMoO 4 core-shell hybrid nanostructure was prepared by a hydrothermal method. The series of core-shell nanocatalysts were characterized via XRD, SEM, XPS, etc. The electrochemical properties of the obtained catalysts were also measured, and the conclusion that the catalysts could reduce the overpotential of the reaction required was figured out. The conclusion of the overpotential of catalyzing the water splitting reaction provides new ideas for the research of the catalyst for electrocatalytic water splitting reaction.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Songyu Yang,Kailin Wang,Zhen Wu,Yan Wu
Quantum dots/two-dimensional (0D/2D) semiconductor photocatalysts demonstrate wide solar light absorption region and high charge transfer efficiency. However, the relation between the interfacial electric field and the charge transfer during the photocatalytic hydrogen production process is still unclear. Here, we construct NiCo 2 O 4 quantum dots (QDs) and NiCo 2 O 4 nanoparticles (NPs) anchored with 2D g-C 3 N 4 (CN) to form NiCo 2 O 4 -QDs/CN and NiCo 2 O 4 -NPs/CN heterojunctions. The hydrogen production rate of CN loaded with NiCo 2 O 4 QDs is about 3 times higher than that of CN loaded with NiCo 2 O 4 NPs. The electric field intensity at the NiCo 2 O 4 -QDs/CN interface is calculated to be about 15,600 V cm −2 , about 9 times higher than that of NiCo 2 O 4 -NPs/CN, which could effectively drive the electrons of CN to flow toward NiCo 2 O 4 QDs, promoting photocarriers separation and hence greatly improving the photocatalytic performance. This work provides a method to understand the relationship between interfacial electric field strength and photogenerated charges of heterostructure photocatalysts.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Dongxu Zhu,Guyu Liu,Guangjiang Zhang,Zihao Yin,Huan Yang,Shuai Gao,Chenhe Zhang,Xinguo Xi
Spinel-type transition metal oxide (AB 2 O 4 ) are promising non-precious metal catalysts for oxygen evolution reaction (OER), addressing the challenges of high cost and poor stability in electrocatalytic water splitting. However, their widespread application is hindered by low electrical conductivity and suboptimal performance. In this study, we developed an oxygen vacancy anchoring strategy to construct a highly efficient and durable NiCo 2 O 4 -NiSe 2 heterojunction catalyst on a nickel foam substrate. The three-dimensional cross-linked porous nanorod array facilitates mass and charge transportation. The abundant interconnected interfaces enhance electron transfer kinetics and adsorption of OH intermediates, as confirmed by theoretical simulations. As a result, the as-synthesized NiCo 2 O 4 @NiSe 2 /NF exhibits an overpotential of only 299 mV at a current density of 60 mA cm −2 , significantly outperforming the single-phase NiCo 2 O 4 and demonstrating exceptional durability.
研究领域:
材料科学
·
电催化
·
能源转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 37
·19404-19412
·
IF 6.895
Xi Cao,Yan Sang,Lvxuan Wang,Gaofei Ding,Runhan Yu,Baoyou Geng
Electrocatalytic water decomposition is the key to sustainable energy, and the design and synthesis of cost-effective electrocatalysts is the main objective of electrocatalytic water splitting. In this paper, multi-interfacial FeOOH@NiCo2O4 hybrid nanoflowers are prepared through a two-step hydrothermal reaction. In such heterostructures, NiCo2O4 nanoflowers are coated with a layer of FeOOH nanoparticles. In addition, the obtained electrocatalyst could provide abundant electroactive sites and the formation of FeOOH@NiCo2O4 nanointerfaces can also improve the charge transfer rate. As a result, under the HER and OER conditions, the prepared catalysts show an outstanding electrocatalytic performance. Moreover, in a two-electrode water splitting system, the FeOOH@NiCo2O4 heterostructure, as a dual-function electrocatalyst, needs a cell voltage of only 1.58 V at a current density of 10 mA cm−2. This study provides a facile and feasible method to construct different kinds of heterostructures as bifunctional electrocatalysts with multiple interfaces by a simple hydrothermal method.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL PHYSICS
·
2024
·
IF 2
Mingyang Gao,Shicheng Wang,Zexuan Wang,Simeng Wang,Yushu Sun,Qianyun Li,Sen Lei,Qiang Li,Zhiyong Zhang,Xiaolong Ma,Wu Zhao
This study addresses a scientific challenge by elucidating the influence of calcination temperature on the properties and electromagnetic wave absorption capabilities of NiCo 2 O 4 , a material whose performance is inherently tied to its preparation process. Specifically, we systematically investigate how varying calcination temperatures not only diversify the material’s composition and morphology but also enhance its electromagnetic wave absorption properties. By controlling the calcination temperature, we not only achieve the successful synthesis of NiCo 2 O 4 but also unravel intricate correlations among calcination conditions, material composition, and wave absorption performance. Notably, NiCo 2 O 4 sample calcined at 400 °C exhibits remarkable electromagnetic wave absorption, marked by an exceptional maximum reflection loss of −53.93 dB and a broad absorption bandwidth spanning 6.24 GHz. These insights contribute to advancing the frontiers of NiCo 2 O 4 utilization, particularly in the realm of electromagnetic wave absorption and beyond, underscoring the novelty and impact of our research.
研究领域:
材料科学
·
电磁学
✓ 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）