CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Ling-Xia Yun,Xin-Ran Shi,Tian-Bao Chen,Yu-Hang Gu,Meng Qiao,Hang-Tian Zhang,Jie-Xin Wang
Regarding the environmental and ecological hazards of waste plastics, the unexploited polyester resources promise to produce valuable chemicals and fuels by electrocatalytic upcycling in combination with alkaline hydrolysis. Herein, we propose a universal approach to synthesize carbon supported NiCo 2 O 4 nanoparticles (NPs) utilizing high gravity technology combined with heat treatment for electrocatalytic valorization of polyethylene terephthalate (PET). This route enables instantaneous and continuous precipitation of the composites including Co-NH 3 complex and Ni hydroxide on carbon in a rotating packed bed (RPB) reactor, and achieves ultrasmall and ligand-free NiCo 2 O 4 NPs (6 nm) with significantly improved dispersity after heat treatment. The as-prepared NiCo 2 O 4 NPs/C converts PET-derived EG to formate with a promising faradaic efficiency (FE) of over 90 % and a high productivity of about 4.5 mmol·cm −2 ·h −1 at 1.5 V (vs RHE). Furthermore, this strategy can also be extended to the preparation of other supported ternary oxide NPs for efficient electro-oxidation of PET hydrolysate.
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高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Tianyi Ma,Yunhua Lu,Shiai Xu,Mengshi Zhu
This study employed three-dimensional porous carbon with high surface area as the conductive substrate for composite electrode materials, aiming to facilitate rapid charge transfer and ion diffusion to increase the specific capacitance of pseudo-capacitive materials. We employed an in-situ hydrothermal method to anchor NiCo 2 O 4 onto the porous carbonized verbena leaves, yielding nanostructured VC@NiCo 2 O 4 -8 composite electrode materials. At a current density of 1.0 A g -1 , VC@NiCo 2 O 4 -8 exhibited a high specific capacitance of up to 2061.8 F g −1 and remarkable cycling stability (with only 7.8 % capacitance loss after 10000 cycles). Additionally, we assembled VC@NiCo 2 O 4 -8//VC asymmetric all-solid-state flexible supercapacitors , attaining a significant energy density of 54.0 Wh kg −1 at a power density of 695 W kg −1 , while maintaining good flexibility and stability. This study provides a simple and effective method for the design and construction of high-performance electrode materials for flexible energy storage devices.
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高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Xinying Han,Yutong Shan,Rui Wang,Shiyu Wang,Yang Zhao,Huan Wang
To satisfy the pressing demands for heavy metal ions (HMIs) detection, A novel sensor was developed to detect lead (Pb 2+ ) ions based on oxygen vacancy-rich NiCo 2 O 4 (NCO) nanoparticles and polyaniline (PANI) nanowires. The NCO/PANI nanocomposite was synthesized via a synergistic salt-assisted carbonization activation and conductive polymers doping strategy, which simultaneously introduced abundant oxygen vacancies and optimized the heterostructure interface. The NCO nanoparticles coupled with imine functional groups (-N=) on PANI create synergistic adsorption-catalytic sites for Pb 2+ . The sensitivity of the NCO/PANI-modified glassy carbon electrode (GCE) reached an impressive value of 14.96 μA·μM −1 , representing increases of 2.5-fold, 4.14-fold, and 24.9-fold compared to that of the NCO-modified GCE (5.99 μA·μM −1 ), PANI-modified GCE (3.616 μA·μM −1 ), and bare GCE (0.6 μA·μM −1 ), respectively. This performance results from oxygen vacancies accelerated electron transfer, redox pair interactions (Co 2+ /Co 3+ , Ni 2+ /Ni 3+ ), and enhanced Pb 2+ adsorption by complexation and pore confinement. The sensing platform achieves an ultralow detection limit of 0.001 μM (S/N = 3) and exhibits robust anti-interference against common coexisting interferences (Cd 2+ , Cu 2+ , Fe 2+ , Ni 2+ , Zn 2+ , Fe 3+ bisphenol A, catechol, hydroquinone, resorcinol), with satisfactory recovery (101 %–106.2 %) and excellent long-term stability in real water samples. This work not only establishes a robust foundation for optimizing material selection but also expands the horizon for the development of electrochemical sensing platforms.
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高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Liang Tian,Lei Cai,Zhengyuan Ding,Yaqiu Zhou,Yan Zhang,Quan Liu,Xin Ge,Chunmei Yu
We design a portable and non-invasive lactate biosensor that can conveniently monitor lactate levels in real human sweat. The proposed biosensor is constructed through the immobilization of lactate oxidase (LOx) and horseradish peroxidase (HRP) on flower-like NiCo 2 O 4 microspheres coupled with single-walled carbon nanotubes (SWCNTs). The synergistic effect between NiCo 2 O 4 microspheres and SWCNTs can increase the conductivity and the active surface area of the electrode. Using ferrocene–methanol (FcMeOH) as the electron transfer mediator in buffer, the developed biosensor can detect lactate in a wide linear range of 0.1 mM to 30 mM with a detection limit of 39.9 µM under optimal conditions. Additionally, the biosensor exhibits excellent selectivity and stability. As proof of concept, the biosensor was applied to monitor lactate level in real human sweat samples, and the results were in good agreement with those obtained by high-performance liquid chromatography (HPLC) analysis. The lactate biosensor is cost effective and can be as a non-invasive alternative to blood analysis, which is suitable for rapid analysis of lactate levels in the fields of fitness, health monitoring and clinical diagnosis.
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高影响因子
IONICS
·
2024
·
IF 2.4
Xiao Mi,Du Xinyue,Yang Songyi,Hui Xinyu,Song Zhuoyuan,Gao Xiaofan,Xiao Meng,Zhang Weixi
Double transition metal oxides and oxygen group element compounds are widely used in supercapacitor electrode materials. In this work, nanowire-like NiCo 2 O 4 was synthesised using a hydrothermal method, and Ni 3 Se 4 was deposited on a nickel foam using NiCo 2 O 4 as the base material utilizing electrodeposition. Composites exhibit superior electrochemical properties with lower impedance values than single materials. Ni 3 Se 4 @NiCo 2 O 4 /NF composite showed an areal capacitance of 1404.17 mF cm −2 at 1 mA cm −2 , outperforming both NiCo 2 O 4 /NF (735.83 mF cm −2 ) and Ni 3 Se 4 /NF (523.5 mF cm −2 ) electrodes. The asymmetric supercapacitor is formed by using Ni 3 Se 4 @NiCo 2 O 4 /NF composite electrode as anode and carbon electrode as cathode with 3 M KOH solution as electrolyte. The device has an energy density of 0.0864 mWh cm −2 at a power density of 0.8 mW cm −2 and 0.0231 mWh cm −2 at a power density of 7.996 mW cm −2 . The capacitance retention of this asymmetric supercapacitor remained 91.76% after 5000 cycles at a current density of 10 mA cm −2 .
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Miaomiao Cao,Wanbao Wu,Ruitian Guo,Yihong Liang,Guangxing Pan,Hao Wu,Xiangli Liu,Jiaheng Zhang
The construction of carbon-encapsulated transition metal nanotube structures is a preferred method that can effectively slow down volume expansion, improve cycling stability and enhance the electrical conductivity of the reactive sites of lithium-ion batteries. In this study, nanotubes of carbon-coated NiCo-NiCo 2 O 4 nanoparticles (NC-NCO@C) were prepared by a one-step molten salt method at high temperature using Ni and Co as catalytic centers and sodium acetate as carbon source. We used NC-NCO@C-2 nanotubes as anode materials for lithium-ion batteries(LIBs), which exhibited excellent lithium storage performance and good stability, with a specific capacity of 616.26 mAh g −1 after 1000 cycles at a high current density of 1 A g −1 . In addition, NC-NCO@C-2 were used as anodes in lithium-ion full cells and LiFePO 4 (LFP) was used as the cathode. The NC-NCO@C-2//LFP full-cell exhibits high capacity and good cycling stability, with a capacity of 100.7 mAh g −1 after 100 cycles and a capacity retention rate of 92%. The construction of NC, NCO, and carbon ternary complexes was found to activate and promote the reversible conversion of certain inorganic components at the solid electrolyte interfaces (SEI), which effectively reduced the volume change during cycling, increased the electrical conductivity, and improved the cycling stability of the electrode. The proposed one-step molten salt synthesis of Carbon-coated metals complexes with excellent compatibility characteristics, is expected to solve the problem of volume change in transition metals, which is encountered in LIBs applications.
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PubMed
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.
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PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Gang Zhou,Chen Wu,Yuehua Wei,Chengchao Li,Qingwang Lian,Chao Cui,Weifeng Wei,Libao Chen
In this article, tufted NiCo 2 O 4 nanoneedles directly grown on carbon nanofibers (CNFs) were successfully fabricated by a facile hydrothermal procedure and subsequent annealing. The morphology of tufted NiCo 2 O 4 nanoneedles/carbon nanofibers (TNN/CNFs) composite appears like clustered acicular leaves on branches, forming a unique three dimensional (3D) hybrid structure. Compared to NiCo 2 O 4 nanoneedles spheres (NNS) without CNFs, the TNN/CNFs material presents a reversible discharge specific capacity up to 1033.6 mAh g −1 at a current density of 200 mA g −1 even after 250 cycles, with the coulombic efficiency of above 98%. The unique 3D hybrid structure formed with CNFs should be responsible for the superior lithium storage capacity and enhanced cycling performance, which provides short distance for ions transport, high specific surface area for large contact areas between electrode and electrolyte, together with the interspace to accommodate volume change and smaller agglomeration tendency. Moreover, the design route proposed offers more possibility to preparation of high-performance anode materials for LIBs.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Long Cheng,Linzhi Zuo,Chengping Li,Jiubing Shen,Liang Wang,Yang Li,Dmitrii Dukashin,Petr Senin,Shitan Yan,Ting Bian
Solar-driven interfacial evaporation is a kind of sustainable and eco-friendly method of water treatment to alleviate the global water crisis. Here we demonstrate a novel sandwiched solar interfacial evaporator integrating phase change material (PCM), sodium alginate hydrogel (SA), and NiCo 2 O 4 nanoflower featuring superb evaporation and glorious thermal energy management to achieve efficient energy utilization and long-term evaporation stability. After being combined with filter paper, NiCo 2 O 4 nanoflower composites are adopted as the light absorber on the top layer, which can achieve an absorption of about 96.5 % in the full spectral range. SA hydrogel has been used as an intermediate layer for rapid water supply to the evaporation interface and to prevent salt deposition. Under one sun irradiation (1 kW m −2 ), the evaporator exhibits a high evaporation rate (1.94 kg m -2 h −1 ) and excellent endurance in the treatment of high salt-concentration water. In particular, benefiting from the rational combination of PCM, the water production reached up to 12.13 kg m −2 , which is 2.23 kg m -2 higher than that of the evaporator without PCM under natural solar irradiation for 9 h. This work presents a promising concept for maximally utilizing intermittent solar irradiation energy and prolonged salt-free deposition desalination.
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高影响因子
Nano-Micro Letters
·
2017
·Vol. 10
·期 1
·1-7
·
IF 4.849
Zhang Xiong,Zhou Yanping,Luo Bin,Zhu Huacheng,Chu Wei,Huang Kama
The ternary transitional metal oxide NiCo 2 O 4 is a promising anode material for sodium ion batteries due to its high theoretical capacity and superior electrical conductivity. However, its sodium storage capability is severely limited by the sluggish sodiation/desodiation reaction kinetics. Herein, NiCo 2 O 4 double-shelled hollow spheres were synthesized via a microwave-assisted, fast solvothermal synthetic procedure in a mixture of isopropanol and glycerol, followed by annealing. Isopropanol played a vital role in the precipitation of nickel and cobalt, and the shrinkage of the glycerol quasi-emulsion under heat treatment was responsible for the formation of the double-shelled nanostructure. The as-synthesized product was tested as an anode material in a sodium ion battery, was found to exhibit a high reversible specific capacity of 511 mAh g −1 at 100 mA g −1 , and deliver high capacity retention after 100 cycles.
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高影响因子
Nanoscale
·
2015
·Vol. 8
·期 3
·1390-1400
·
IF 7.394
Jie Yin,Panpan Zhou,Li An,Liang Huang,Changwei Shao,Jun Wang,Hongyan Liu,Pinxian Xi
Water splitting via the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in producing H2 and O2 is a very important process in the energy field. Developing an efficient catalyst which can be applied to both HER and OER is crucial. Here, a bifunctional catalyst, CFP/NiCo2O4/Co0.57Ni0.43LMOs, has been successfully fabricated. It exhibits remarkable performance for OER in 0.1 M KOH producing a current density of 10 mA cm−2 at an overpotential of 0.34 V (1.57 V vs. RHE), better than that of the commercial Ir/C (20%) catalyst. Simultaneously, it also exhibits good catalytic performance for HER in 0.5 M H2SO4 producing a current density of 10 mA cm−2 at an overpotential of 52 mV and a Tafel slope of 34 mV dec−1, approaching that of the commercial Pt/C (20%) nanocatalyst. Particularly, CFP/NiCo2O4/Co0.57Ni0.43LMOs present better durability under harsh OER and HER cycling conditions than commercial Ir/C and Pt/C. Furthermore, an H-type electrolyzer was fabricated by applying CFP/NiCo2O4/Co0.57Ni0.43LMOs as the cathode and anode electrocatalyst, which can be driven by a single-cell battery. This bifunctional catalyst will be very promising in overall water splitting.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2026
·
IF 2.6
Jingliang Wang,Xiaoyu Cheng,Dechao Chen,Jiaqi Yu,Zailai Xie,Changsheng Cao
The development of high-performance cathode materials is crucial yet highly challenging for aqueous alkaline zinc batteries (AZBs). Herein, hollow multi-shell NiCo2O4 spheres (NiCo2O4-HMSs) with three to four interconnected shells were prepared through controllable thermal treatment of a metal–organic framework (MOF) precursor. Benefiting from their high specific surface area and unique hollow multi-shell architecture, these nanostructured oxides facilitate efficient electrolyte penetration and rapid ion/electron transport, while simultaneously exposing abundant electrochemically active sites, thereby enabling a markedly enhanced capacity. When assembled into a NiCo2O4-HMSs//Zn battery, the cathode delivers a high specific capacity of 152.8 mAh g−1 at 2 A g−1 and outstanding cycling durability, retaining 121.1 mAh g−1 after 500 cycles at 6 A g−1, markedly outperforming its single-shelled NiCo2O4 counterpart. The resulting device further achieves an energy density up to 264.3 Wh kg−1 and a power density up to 24.7 kW kg−1, demonstrating a favorable balance between energy output and rate capability. Electrochemical analyses reveal reduced interfacial resistance and mixed capacitive/diffusion-controlled charge storage with a pronounced surface-controlled contribution at elevated scan rates, consistent with accelerated reaction kinetics enabled by the multi-shell architecture. This work highlights that rational multi-shell structural engineering provides an effective route to improve energy/power characteristics and cycling stability of NiCo2O4-based cathodes for alkaline aqueous Zn batteries.
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高影响因子
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