JOM
·
2025
·
IF 2.3
Yin Ning,Song Yonghui,Zhang Xingyu,Dong Ping,Zhang Xinwei
We aimed to recover Ni and Co from the leaching sulfate solution of nickel-based superalloy scraps (NSL) and to synthesize NiCo 2 O 4 through oxalate co-precipitation-calcination technique. The structural and compositional analyses of the resultant products were characterized utilizing x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). Furthermore, the effects of nickel-cobalt molar ratio and calcination temperature on the oxygen evolution reaction (OER) performance were investigated. The results indicated that under optimal conditions of 0.7 M C 2 O 4 2− addition, 25°C, and 4 h reaction time, the precipitation efficiencies for Co 2+ and Ni 2+ were 99.19% and 95.79%, respectively. The precipitate derived from adjusting the Ni/Co molar ratio in NSL manifested as a solid solution of nickel-cobalt oxalate (Ni x Co 3-x (C 2 O 4 ) 3 ). As the molar ratio decreased, the precipitates gradually transformed from a nickel oxalate structure with Ni sites replaced by Co to a cobalt oxalate structure with Ni replacing Co sites. The pure phase structure NiCo 2 O 4 , synthesized with a Ni/Co molar ratio of 1/2 and calcined at 450°C for 2 h, exhibited an overpotential of 430 mV at a current density of 10 mA·cm −2 in 0.1 M KOH, a Tafel slope of 93.69 mV·dec −1 , and a C dl of 242.75 mF·cm −2 . Upon exceeding 450°C during calcination, the gradual expulsion of heteroatoms from the matrix resulted in structural destruction. Consequently, the electrocatalytic activity of the sample decreased because of the gradual removal of surface oxygen vacancy concentration and Co 3+ /Co 3+ + Co 2+ . The methodology employed in this study not only efficiently recovers Ni 2+ and Co 2+ from the NSL but also prepares electrocatalysts with superior performance for the oxygen evolution reaction.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Xinying Han,Yutong Shan,Hai Zhao,Jing Guo,Yongchun Fu,Yang Zhao,Huan Wang
Driven by the urgent demand for ultrasensitive detection of trace lead (Ⅱ) ions (Pb 2+ ), we developed a novel electrochemical sensor based on oxygen vacancy-engineered NiCo 2 O 4 (NCO) nanorods anchored on coconut shell-derived porous biochar (BC). The BC/NCO composite was prepared via a synergistic NaHCO 3 -assisted one-step carbonization activation and hydrothermal metal oxide doping strategy, which simultaneously introduced abundant oxygen vacancies and optimized the heterostructure interface. The unique rod-like morphology of NCO, coupled with abundant oxygen-containing functional groups on BC, creates synergistic adsorption-catalytic sites for Pb 2+ . The BC/NCO-modified glassy carbon electrodes (GCE) demonstrate exceptional sensitivity (24.90 µA·µM −1 ), outperforming bare GCE (0.60 µA·µM −1 ), BC-modified GCE (7.92 µA·µM −1 ), and NCO-modified GCE (4.90 µA·µM −1 ) by 42.03-fold, 3.14-fold, and 5.08-fold, respectively. This performance is attributed to oxygen vacancy-mediated electron transfer acceleration, redox pair interactions (Co 2+ /Co 3+ , Ni 2+ /Ni 3+ ), and enhanced Pb 2+ adsorption via complexation and pore confinement. The sensor achieves an ultralow detection limit of 0.004 µM (S/N = 3) and maintains robust anti-interference performance against common coexisting interferences (Cd 2+ , Cu 2+ , Fe 2+ , Ni 2+ , Zn 2+ , Fe 3+ , Hg 2+ , As 3+ , Cr 6+ , catechol, hydroquinone, resorcinol), with 98.3 −106.5 % recovery in real water samples. This work not only advances the design of eco-friendly sensing platforms through defect engineering and biomass valorization but also demonstrates high practicality for on-site heavy metal monitoring.
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ACS Sensors
·
2026
·
IF 10.9
Ruilong Ma,Youlin Gu,Zhenyu Liu,Zhencheng Liu,Wenhao Wu,Fanhao Meng,Xiaoyan Peng
Hydrogen sulfide (H2S) poses significant risks in industrial settings due to its high toxicity and flammability, making its efficient detection crucial for operational safety. In this study, high-performance MEMS gas sensors based on a nitrogen-doped carbon quantum dot/nickel cobaltite (N-CQD/NiCo2O4) nanocomposite were developed, achieving highly sensitive H2S detection. Characterization techniques such as XRD, XPS, SEM, and TEM confirmed the successful loading of N-CQDs onto the NiCo2O4 surface, leading to an increase in oxygen vacancy concentration. The sensor with NCQD/NCO-2 exhibited excellent H2S selectivity, good repeatability, and long-term stability over 40 days. At low-temperature heating, the response to 1000 ppm H2S was enhanced by a factor of 6.84, with a theoretical detection limit of 9.42 ppb. Beyond the material-level enhancement, this work integrates N-CQD-mediated surface/interfacial activation, a low-temperature-heated MEMS sensor array, and a lightweight temporal regression model for H2S quantification. The DCG-Net model achieved accurate concentration prediction with an R2 value of 0.9902 and was successfully deployed, offering a compact material-device-algorithm solution for intelligent H2S monitoring.
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MICROCHIMICA ACTA
·
2026
·Vol. 193
·期 10
·686
·
IF 5.4
Zhang Li,Xiong Shuiying,Jiang Liting,Qiu Jiaxin,Jin Qian,Lv Xinding,Tu Xinman
A novel electrochemical sensor for determination of vanillin based on carbon black and NiCo 2 O 4 nanocomposite (CB@NiCo 2 O 4 ) was established. The nanocomposite was immobilized onto electrode surface, the carbon black can selectively adsorb vanillin via π-π stacking interactions between the aromatic domains and the benzene ring of vanillin. Concurrently, the NiCo 2 O 4 with cage-structure enhances the electrochemical signal response of the adsorbed vanillin by the high specific surface area and favorable ion-exchange capability. Under optimized experimental conditions, the sensor exhibits a linear range of 0.1 ~ 60 µM with a limit of detection of 30 nM, and the selectivity and signal stability were confirmed to be satisfactory. In real-sample analysis, the results are agreement with the contrast testing results of high-performance liquid chromatography, and the spike recovery experiment values ranged from 95.35% to 103.80%, with relative standard deviations (RSDs) of 3.77%~4.59% ( n = 3). The proposed electrochemical sensor possesses a favorable application prospect in product quality control. Graphical abstract
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Bo-Cai Liu,Wei-Yan Xia,Shang-Qing Wang,Chang-Wei Xu,Zi-Li Liu
Spinel oxide NiCo 2 O 4 firstly has been explored to promote activity of Au for glycerol electrooxidation, which is supported on a three-dimensional hierarchical porous graphene-like carbon (3D HPG) material. Addition NiCo 2 O 4 into the Au/HPG catalyst can significantly improve the catalytic performance for glycerol oxidation. When NiCo 2 O 4 is added to the Au/HPG, onset potential is more 108 mV negatively than that on the Au/HPG. Peak current density on the Au/NiCo 2 O 4 (wt 6:1)/HPG is 5.1 times as high as that on the Au(20wt%)/HPG. The Au/NiCo 2 O 4 in this work shows a great potential as electrocatalyst for glycerol electrooxidation in alkaline medium.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Chengcheng Qi,Chongchao Zhang,Ziyin Yang
A novel strategy was reported to improve electrocatalytic activity of NiCo 2 O 4 by doping Fe. It is interesting to find that the doping of Fe induces formation of nanorod composing with crystalline core and thin amorphous shell. The composition, structure and properties of NiCo 2 O 4 are well characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry and amperometric method. The results display that the presence of thin amorphous shell is conducive to accelerating electron transfer rate and exposing more effective active sites, therefore making the sensor based on Fe-doped NiCo 2 O 4 detect glucose in a wide linear range from 0.2 μM to 3.1 mM with a high sensitivity of 3055.7 μA mM −1 cm −2 and a low detection limit of 0.19 μM. This unique crystalline core/amorphous shell-structured NiCo 2 O 4 demonstrates promising potential as an effective electrocatalyst for glucose sensing.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Haowen Wang,Shixuan Feng,Maoqin Sun,Xue Li,Chuanjin Wang,Zhongtai Lin,Mingliang Ma,Tingxi Li,Yong Ma
In contemporary times, electromagnetic radiation poses a significant threat to both human health and the normal functioning of electronic devices. Developing composites as adsorption materials possess exceptional electromagnetic wave absorption performances can efficient address this critical issue. Herein, hollow core–shell NiCo 2 O 4 @polypyrrole nanofibers/reduced graphene oxide (NiCo-HFPR) composites are fabricated by the combination of electrostatic spinning, air calcination, in-situ polymerization, freeze-drying and hydrazine vapor reduction. As anticipated, NiCo-HFPR-0.2 exhibits noteworthy properties, with the minimum reflection loss (RL min ) of −61.20 dB at 14.26 GHz and 1.56 mm, as well as the effective absorption bandwidth (EAB) of 4.90 GHz at 1.57 mm. Additionally, the simulation procedure is employed to determine the radar cross-section (RCS) attenuation. In comparison to a singular perfect electrically conductive (PEC) layer, the PEC layer coated with NiCo-HFPR-0.2 consistently yields an RCS value below −10 dB m 2 within the range of −60° < θ < 60°. The RCS attenuation value of the NiCo-HFPR-0.2 coating achieves an outstanding 31.0 dB m 2 at θ = 0°, strongly affirming the ability to effectively attenuate electromagnetic wave in real-world applications. The employed experimental methodology, the meticulously crafted composite, and the simulation outcomes presented in this study bear great promise for the progressive advancement of both theoretical investigations and practical applications within the domain of electromagnetic wave absorption.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Lei Liu,Yueyue Li
The spinel and perovskite-based heterogeneous catalysts play indispensable roles in the sulfate radical-based advanced oxidation process (SR-AOP). In this study, novel electrospun boron-doped NiCo 2 O 4 /LaCo 1−x B x O 3 (NCO/B x , 0 ≤ x < 1) catalysts were constructed using defect and interface engineering to accelerate peroxymonosulfate (PMS) activation. Due to the synergistic impacts of oxygen vacancies (OVs) and heterointerfaces, NCO/B 0.2 demonstrated improved catalytic performance toward the degradation of Orange II (Org II). The NCO/B 0.2 catalyst showed a high degree of pH tolerance, with a range of 5.0–11.0, while maintaining a removal rate of 94.2% even after five cycles. The degradation pathway exhibited a preference for non-radical mechanisms, with singlet oxygen ( 1 O 2 ) being the dominant reactive oxygen species. The synthesis method for NCO/B x exhibits the potential to facilitate rational design and large-scale production of exceptionally effective heterostructured catalysts.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2021
·
IF 3.995
Bingcheng Sun,Fengjuan Miao,Bairui Tao,Yanchun Wang,Yu Zang,Paul K. Chu
By combining NiCo 2 O 4 with good hydrogen evolution reaction (HER) properties and palladium (Pd) nanoparticles with excellent conductivity, a highly efficient and stable catalyst is prepared for HER. The NiCo 2 O 4 nanosheets and NiCo 2 O 4 nanoflowers are produced on the nickel foam (NF) with a large specific surface area by a one-step hydrothermal method and the NiCo 2 O 4 nanoflowers are uniformly distributed in the NiCo 2 O 4 nanosheets to form a three-dimensional (3D) electrode. Compared to conventional NiCo 2 O 4 , the 3D NiCo 2 O 4 electrode provides more active sites (Ni and Co) for oxygen adsorption thus reducing the energy required to break H–O bonds to promote HER. When NiCo 2 O 4 /NF is combined with Pd nanoparticles (Pd/NiCo 2 O 4 /NF), the HER performance is improved greatly because of the synergistic effects rendered by the 3D structure of NiCo 2 O 4 and Pd nanoparticles. The overpotential of Pd/NiCo 2 O 4 /NF is 69 mV at a current density is 10 mA/cm 2 and it is stable for 10 h in alkaline environments. The materials design and properties provide useful information for future development of commercial hydrogen production .
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DALTON TRANSACTIONS
·
2020
·Vol. 50
·期 3
·1097-1105
·
IF 4.174
Yaju Zhou,Chunyan Li,Xin Li,Pengwei Huo,Huiqin Wang
Highly dispersed nitrogen doped carbon (N–C) is decomposed by 2-methylimidazole (C4H6N2) and is used as a composite material with nickel cobaltite (NiCo2O4). The N–C and NiCo2O4 composites are obtained by a one-step hydrothermal method and subsequent calcination. In addition, N–C is used to control the morphology and structure of NiCo2O4 to obtain excellent capacitor materials. The N–C/NiCo2O4 electrode shows an excellent specific capacitance of 157.97 mA h g−1 (1263.75 F g−1) at 1 A g−1. Herein, we successfully develop a N–C/NiCo2O4//AC asymmetric supercapacitor (ASC), which is prepared using N–C/NiCo2O4 as a cathode coupled with activated carbon (AC) as an anode at a voltage of 1.6 V. The prepared N–C/NiCo2O4//AC device shows an excellent volumetric energy density of 66.44 mW h kg−1. The promising performance of N–C/NiCo2O4//AC illustrated its potential for portable supercapacitor applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Jing Pan,Shaobin Li,Fengbo Li,Tingting Yu,Yupeng Liu,Li Zhang,Lin Ma,Ming Sun,Xuefeng Tian
Metal-organic frameworks (MOFs)-based derivatives provide a flexible platform for constructing high performance supercapacitors as electrode materials. Herein, a novel NiFe 2 O 4 /NiCo 2 O 4 /GO composites has been successfully prepared by dual-MOF as precursor. The NiFe 2 O 4 /NiCo 2 O 4 /GO composite formed a special structural morphology providing a large surface area. The composite electrode material exhibited an excellent specific capacity of 661.6 C/g (1470 F/g) at 1 A/g, excellent rate capability (from 1 to 20 A/g the specific capacity decreases about 38 %) and outstanding long cyclic life (89.9 % capacity retention after 3000 cycles). Moreover, an asymmetric supercapacitor was composed of NiFe 2 O 4 /NiCo 2 O 4 /GO and activated carbon as positive electrode and negative electrode, respectively. Meanwhile, ASC exhibited a specific capacity of 373.3 C/g at 1A/g in a potential range from 0 to 1.45 V, it showed the maximum energy density of ASC equal to 109 Wh kg −1 at a power density of 1051.17 W kg −1 . In addition, the NiFe 2 O 4 /NiCo 2 O 4 /GO//AC has an outstanding cycling stability (90.7 % capacitance retention after 1000 cycles), which makes it a potential application for in the field of energy storage-conversion application.
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MATERIALS TECHNOLOGY
·
2020
·
IF 1.738
Xiaohua Tian,Jiangdong Dai,Lulu Wang,Atian Xie,Jinsong He,Yongsheng Yan
Here, hierarchically N-doped porous carbon (HPNC) with very high surface area was prepared by a facile one-pot pyrolysis of ethylenediaminetetraacetic acid tripotassium salt dihydrate used as the carbon/nitrogen source and pore activating agent. The NiCo2O4 nanosheets were vertically grown onto the surface of HPNC (V-NiCo2O4/HPNC) via a urea homogeneous precipitation method by a microwave heating. Whereas the parallelly orientated NiCo2O4/HPNC (P-NiCo2O4/HPNC) was fabricated by a usual water-bath heating. The loading content of V-NiCo2O4/HPNC was higher than that of the P-NiCo2O4/HPNC, thus resulting in the larger specific capacitance. V-NiCo2O4/HPNC exhibited the high specific capacity (434.8 F g-1 at 1.0 A g-1), good rate performance, cycle stability (capacitance retention of 103% at 5 A g-1 after 1000 cycles) and lower resistance, owing to the synergistic advantages of HPNC and vertically orientated NiCo2O4 nanosheets, which provided high electrical conductivity, and effective electrolyte ions and electrons transport path.
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