SYNTHETIC METALS
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2017
·
IF 2.435
Hongxiu Dai,Pengfei Cao,Duo Chen,Yuan Li,Nan Wang,Houyi Ma,Meng Lin
A nickel-cobalt-sulfide nanosheet (Ni-Co-S NS)/polypyrrole nanowire (PPy NW) core/shell-structured composites on nickel foam (NF) was synthesized by facile electrodeposition processes for electrochemical non-enzymatic glucose sensor. PPy NWs grew on the NF substrate by a potentiostatic deposition method, and then the PPy NWs were further served as skeletons for electrodeposition Ni-Co-S nanosheets. The ternary Ni-Co-S NSs as the shell and PPy NWs as the core on the flexible NF constructed the 3D micro/nano structure. The as-prepared Ni-Co-S/PPy/NF electrode was characterized by scanning electron microscopy (SEM) and energy-dispersive X-ray spectrometer (EDS). The electrochemical sensor was used for the detection of glucose by chronoamperometry. The introduction of the interconnected Ni-Co-S NSs can provide accessible pathways for electrolyte and have high sensitivity to glucose. Compared with the NF and PPy/NF electrodes, the Ni-Co-S/PPy/NF micro/nanohybrid electrode exhibited higher catalytic activity towards electro-oxidation of glucose. The developed Ni-Co-S/PPy/NF electrode showed two linear electrochemical responses to glucose in the range from 2 μM to 140 μM with a correlation coefficient of R 2 = 0.937 and 0.14 mM to 2 mM with a correlation coefficient R 2 = 0.978, and the detection limit is 0.82 μM. Furthermore, the prepared biosensor demonstrated high selectivity to glucose in the presence of uric acid, ascorbic acid and D-fructose.
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高影响因子
NANO
·
2018
·
IF 1.1
Xiaojun Tao,Shuang Wang,Yanbao Zhao,Zhiwei Li
In this paper, a facile one-pot bottom-up approach for the preparation of graphene and Ni/graphene nanostructures at normal pressure and low temperature (150 ∘ C) has been developed. The graphene and Ni/graphene nanostructures were prepared by reducing hexachloro-benzene (C 6 Cl 6 ) with potassium in n -tetradecane (C 1 4 H 3 0 ) solution without the presence of a catalyst. Meanwhile, the effect of Ni content on the specific surface area (SSA) of the final products was investigated. The testing results display that the as-prepared samples have large SSA and high C/O ratio, implying that the designed synthesis method is simple and efficient. To evaluate the adsorption performances of the samples, we select organic dye rhodamine B (RhB) as the model organic contaminant in aqueous solutions. The experimental results show that the samples possess high adsorption capacity ( q max mg g − 1 ) , ultrafast adsorption rate ( > 9 9 %, 2 min), high adsorption efficiency ( ≥ 9 9 . 8 %) and good chemical stability in a wide pH range (2–11), high salt tolerance ( > 8 0 mg mL − 1 ) , and good reusability ( > 9 9 . 5 %, 9 cycles) for dye RhB from water. In particular, the samples exhibit a good property for the treatment of the raw industrial wastewater (RIW).
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Inorganic Chemistry Frontiers
·
2017
·Vol. 5
·期 3
·635-642
·
IF 4.036
Di Tian,Xiaofeng Lu,Guangdi Nie,Mu Gao,Ce Wang
Currently, the search for the fabrication of inexpensive and efficient binder-free electrodes for high performance supercapacitor applications is still a great challenge. In this work, different nanostructures of Ni–Mn oxide (Ni–Mn–O) are directly grown on the surface of flexible electrospun carbon nanofibers (ECNFs) and further used as binder-free electrodes for supercapacitors. Among three typical nanostructures, Ni–Mn–O nanosheets on ECNFs show superior electrochemical properties with a good specific capacitance (368.6 F g−1) and excellent rate properties (88.6% retention at 20 times initial current density) in a three-electrode system. Furthermore, an aqueous symmetry cell and a solid-state symmetry supercapacitor are assembled using two pieces of flexible ECNFs@Ni–Mn–O nanosheets. The maximum energy density and power density based on the solid-state supercapacitor are up to 20.4 W h kg−1 and 5.2 kW kg−1, respectively, indicating that the flexible ECNFs@Ni–Mn–O nanosheets present a fairly promising future for practical applications in the field of energy storage.
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ANALYTICAL SCIENCES
·
2024
·Vol. 40
·期 8
·1437-1448
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IF 1.8
Feng Chengqi,Chen Zhiyuan,Yin Haoyong,Gong Jianying,Wang Hui,Wu Shengji,Wang Ling
Designing portable electrochemical sensors combined with highly efficient glucose oxidation electrodes offers a significant opportunity for convenient glucose detection. In this report, we present the design and preparation of platinum deposited Ni/NiFe 2 O 4 /Carbon composite (Pt/Ni/NiFe 2 O 4 /C) derived from Ni/Fe metal–organic frameworks (MOFs) followed by Pt deposition. Energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and electron microscopy (EM) were utilized to analyze the crystal structure, morphology, and chemical composition of the resulting materials. The glucose sensing capabilities of the optimal Pt/Ni/NiFe 2 O 4 /C-3 were assessed using amperometry methods on a smartphone-based portable device. Acting as a nonenzymatic glucose sensor, the Pt/Ni/NiFe 2 O 4 /C-3 electrode demonstrated notable sensitivity and a low limit of detection for glucose. The portable sensor exhibits high sensitivities of 131.88 μM mM cm −2 at low glucose concentration (3–500 μM) and 29.52 μA mM cm −2 at high glucose concentration (700–4000 μM), achieving a low detection limit of 1.1 μM (S/N = 3). The sensor also demonstrates enhanced selectivity and stability for detecting glucose. Furthermore, the portable sensor exhibits a clear step-ampere response in the detection of serum samples with satisfactory recovery ranging from 99.30 to 101.32%. This suggests the significant potential of portable glucose sensing applications. Graphical abstract
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Haihua Wang,Futao Li,Chao Zhu,Chaoxian Chen,Ze Ding,Xiangping Chen
The rapid growth of the new energy market has led to a substantial increase in the demand for ternary lithium batteries, highlighting the importance of recycling their cathode materials to mitigate environmental risks and alleviate the limited supply of valuable metals. Traditional recycling methods for waste ternary lithium batteries are often inefficient and energy-intensive, particularly in recovering lithium. This study proposes a novel process for the separation and recovery of Li, Ni, Co, and Mn from simulated spent ternary lithium battery cathode materials. The process employs chromatographic separation and column operation techniques using amine-modified polyacrylonitrile fibers as adsorbents, which have selective adsorption capacity for Li with transition metals Ni, Co, and Mn. Experimental results demonstrated a lithium recovery rate of 99.4 % with 100 % purity under optimized conditions: solution pH of 2, feed solution concentration of 10 mmol/L, a fully packed adsorption column, and a feed flow rate of 0.29 mL/min. During the elution process, 0.2 mol/L nitric acid achieved effective desorption of the adsorbed metals. Furthermore, the intermetallic separation coefficients revealed significant separation efficiencies for Ni, Co, and Mn. This proposed method offers notable advantages in recovery efficiency, selectivity, and environmental sustainability, with particularly outstanding performance in lithium recovery, making it a promising strategy for recycling valuable metals from spent ternary lithium batteries.
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Surfaces and Interfaces
·
2024
·
IF 5.7
Yijun Wang,Mei Li,Zhiliang Jin,Shiyong Xu,Ziyu Li,Meijuan Ding
Coal tar pitch-based carbon quantum dots (CQDs) were meticulously prepared via ball milling. Ag 3 PO 4 /Ni-MOF/CQDs composites were synthesized through an in-situ precipitation method, and their performance as composite catalysts for the photocatalytic degradation of phenol was thoroughly investigated. Among these composites, Ag-Ni-70/CQDs-0.45 emerged as the most effective catalyst, achieving a remarkable degradation rate of 98% for 10 mg/L phenol within just 30 min, with a corresponding rate constant of 0.0620 min −1 . Notably, the photocatalytic degradation of phenol exhibited robust activity across a spectrum of pH levels, different water matrices, and varying concentrations of anions (SO 4 2− , Cl − , CO 3 2− , HPO 4 2− and HCO 3 − ). Furthermore, after undergoing 4 cycles of reaction, the catalyst demonstrated commendable stability. The outcomes of free radical capture experiments revealed that the primary active species involved in the degradation process were ·OH and h + . The electron transport pathways were analyzed based on the band gap structure of the catalyst, and a possible degradation mechanism was proposed. Upon the combination of Ni-MOF and Ag 3 PO 4 , the alteration of metal-O bonds facilitated the formation of a tightly bonded interface, thereby establishing a Z-scheme heterojunction. The introduction of CQDs as an electron transport medium accelerated electron transfer, mitigated the recombination of photogenerated charges, and thereby enhanced the photocatalytic performance of the heterostructure.
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Materials Today Communications
·
2025
·
IF 4.5
Lisha Tang,Lirong Qin,Jianwei Zhao,Jiafeng Huang,Guangqiu Zhang,Yihang Zhao
The construction of hierarchical micro/nanostructures as multicomponent electrodes presents a promising approach to address the issue of poor energy density in hybrid supercapacitors (HSC) and alkaline zinc-metal batteries (AZB). In this research, a novel hierarchical structure comprising NiMoO 4 nanosheets adorned with Ni-Co double hydroxide (DH) nanoneedle clusters was fabricated on carbon cloth utilizing a straightforward two-step hydrothermal method. Owing to the unique structure and the synergistic effects, the composite-coated electrode demonstrated superior performance when utilized as an anode in various energy storage devices. When paired with activated carbon in the HSC, it could achieve an energy output of 38 W h/kg and a maximum power of 7043 W/kg, and it sustained 80 % of its capacitance after 5000 cycles. More importantly, when assembled with Zn flakes as the cathode in an AZB, it attained an extraordinary energy density of 519.7 W h/kg and an impressive power density of 16316 W/Kg. These results signify that the hierarchical NiMoO 4 /Ni-Co DH nanocomposite holds considerable promise for applications in energy storage.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Chuanqi Zhang,Xiaomei Cheng,Ruirui Zhao,Mengxian Fu,Meifang Wang,Zhiming Chen,Changfang Zhang,Xiangzi Li
The integration of metal–organic framework (MOF) materials with magnetic cores not only serves as an effective adsorbent but also facilitates the recovery post-adsorption. In this study, we synthesized Ni@ZIF-8 composite nanotubes by introducing ZIF-8 onto the surface of Ni nanotubes, which were used as adsorbents for antibiotic removal. The Ni@ZIF-8 composite nanotubes exhibited high-efficiency and recyclable antibiotic adsorption, with the maximum adsorption capacities for tetracycline (TC) and cefixime (CFX) reaching 770.2 and 428.2 mg·g −1 , respectively. The Ni nanotubes, acting as magnetic cores, facilitated magnetic recovery after adsorption. Furthermore, the introduction of ZIF-8 not only increased the surface roughness of the composite but also incorporated a significant number of functional groups. The pseudo-second-order model, Langmuir model and intra-particle diffusion models provided better fits to the isotherm and kinetic data of the two antibiotics. Density functional theory (DFT) calculations results indicate that the π-π interactions dominate the adsorption process of both TC and CFX onto ZIF-8. And the electrostatic potential (ESP) calculations and interaction analysis indicate that the Ni atom enhances the adsorption behavior through π-π interactions between the benzene ring or carbonyl group of the two antibiotics and the imidazole of ZIF-8. This research offers a novel approach for the removal of antibiotics from contaminated water and environmental remediation using magnetic core-MOF composite materials.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Qingxiang Kong,Yulei Li,Hang Ma,Qin Zhao,Linjing Yang,Ruidong Xu,Hong Guo
Hydrogen energy as a new type of clean energy has been widely used. Electrolysis is a highly effective method of producing hydrogen from water. Catalysts with low development costs and high efficiency are the focus of current research. A novel Ni–W–P/Mo catalyst for hydrogen evolution reaction (HER) was synthesized by electrodeposition based on a molybdenum mesh. The experimental results show that when the current density is 10 mA/cm2, the best overpotential of Ni–W–P/Mo in alkaline medium is 75 mV. Not only that, the Tafel slope (77 mV/dec) also proves its excellent dynamic performance. In addition, the 60 h stability test at a current density of 10 mA/cm2 indicates an excellent long-term stability performance. Compared with the catalysts reported in recent years, the HER performance of Ni–W–P/Mo is much better than that of most nonprecious metal catalysts. The uniform and regular molybdenum network provides a large area of support for the catalyst, which is conducive to the synthesis and reaction of the catalyst. By doping W, the electronic structure of the catalyst is regulated, and the water decomposition is promoted. The stability of the morphology is also an important factor in improving the activity of the catalyst. The amorphous catalyst synthesized by the electrodeposition method in this work provides a new idea for the research of catalytic materials for hydrogen production by electrolysis of water and has important significance for promoting the development of a hydrogen energy economy.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Zhengchu Yue,Yanran Cheng,Qi Jiang,Xueyun Bai,Xiaolong Fang,Xinyu Zhao,Yao Yao,Didi Dong,Yuanyuan Che,Ganggang Chang
As a safe and efficient hydrogen storage material, ammonia borane (NH3–BH3, AB) shows great promise in the era of clean energy advocated by hydrogen. Thus, it is imperative to focus on the exploitation of high-performance heterogeneous catalytic systems for the effective utilization of hydrogen energy stored in AB. However, noble metal catalysts as high-efficiency systems suffer from high expenditure, and the traditional powder-based catalyst faces poor processability and recoverability. Herein, a bimetallic (Co/Ni) MOF-derived CoNiP/hierarchically porous carbon (HPC) monolithic aerogel was successfully prepared by the gelation–carbonization–phosphorization method and applied in the hydrolysis of AB. The ultrasmall transition bimetallic phosphide CoNiP nanoparticles were uniformly fabricated in the hierarchically porous aerogel after pyrolysis. Benefiting from the rapid mass transfer and high exposure of well-defined CoNiP-active species within the hierarchical aerogel support, the Co0.3Ni0.7P/HPC aerogel performed high hydrogen evolution activity and exhibited fast hydrogen generation rate with a completion time of 2 min under mild conditions. The theoretical calculations reveal the key effects of the adsorption energies between AB and water on CoNiP-active sites in the Co0.3Ni0.7P/HPC aerogel. Furthermore, the Co0.3Ni0.7P/HPC monolithic aerogel catalyst can be effortlessly separated and recycled at least 10 times without a remarkable loss of activity. The controllable design of P-doped bimetallic species in the porous aerogel herein should serve as the foundation for the preparation of practical functional monolithic applied catalysts for the hydrolysis of AB.
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GEOCHIMICA ET COSMOCHIMICA ACTA
·
2012
·
IF 4.259
Hui Yin,Wenfeng Tan,Lirong Zheng,Haojie Cui,Guohong Qiu,Fan Liu,Xionghan Feng
Hexagonal birnessite is the most ubiquitous manganese oxide in geological environments. It is often highly enriched in trace metal ions such as Ni and plays an important role in metal(loids) geochemistry . Nanostructured birnessites containing different amounts of Ni were synthesized by addition of Ni 2+ to initial reactants. Powder X-ray diffraction (XRD), element analysis, field emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), X-ray absorption spectroscopy (XAS) and isothermal adsorption and oxidation of metal(loids) were carried out to investigate the effects of Ni doping on the substructure and physicochemical properties of birnessite, and Ni crystal chemistry in birnessite. These Ni-rich birnessites have Ni contents as high as 2.99% (Ni5) and 6.08% (Ni10) in weight. EXAFS results show that Ni5 has 23.7% of the total Ni (0.71 wt.%) and Ni10 has 34.5% of the total Ni (2.10 wt.%) in Mn octahedral layer with the remaining Ni located at vacancies and edge sites. The Ni-rich birnessites have weaker crystallinity and thermal stability, fewer layers stacked along the c axis, ∼1.5–2.7 times larger surfaces areas, and a higher Mn average oxidation numbers (AONs) compared to the birnessite without Ni. Additionally, the doping of Ni during birnessite crystallization enhances the formation of vacancies in the layer; however, adsorption capacities for Pb 2+ and Zn 2+ by these Ni-rich birnessites are reduced, mainly because of vacancies and edge sites occupation by a large amount of Ni. The Ni-rich birnessites exhibit much higher oxidation capability and can completely oxidize As(III) in solution at rapid initial reaction rates under the experimental condition. The results indicate that incorporation of Ni into the natural birnessite in ferromanganese nodules may be achieved both by direct coprecipitation with Mn to build the layers and migration over time from adsorbed Ni on the surface into the layer structure. It is also implied that Ni doping in birnessite has great impact on the geochemical behaviors of heavy metals, either in adsorption or oxidation reactions.
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高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Ao Ding,Yupeng He,Fei-Fei Chen,Yan Yu
Bacterial infections result in significant burdens on public health, especially with the increasing prevalence of antibiotic resistance owing to the overuse of antibiotics. The development of the next-generation nanoantibacterial materials as alternatives to antibiotics is urgently needed. Metal–organic frameworks (MOFs) have been emerging as promising antibacterial materials. However, the impact of metal centers on the properties and antibacterial activity of MOFs has not been clarified to date. In this work, five M-MOF nanomaterials (M = Fe, Co, Ni, Cu, Zn) are synthesized with 2-methylimidazole as an organic ligand. Subsequently, the minimum inhibitory concentration (MIC), minimum bactericidal concentration, and time-kill curves are studied to evaluate their antibacterial activity. In addition, the destruction of the bacterial cells after treatment with M-MOFs is observed via scanning electron microscopy. The experimental results demonstrate that the Co-MOF and Zn-MOF polyhedra exhibit optimal antibacterial activity. They can effectively inhibit the growth of both Gram-negative bacteria Escherichia coli and Gram-positive bacteria Staphylococcus aureus at a low concentration. On the other hand, the Fe-MOF irregular particles show the weakest antibacterial activity among five M-MOFs and the antibacterial activity of the Ni-MOF and Cu-MOF nanosheets are comparable to each other. The huge difference in antibacterial activity of M-MOFs is attributed to the difference in the shape and size, specific surface area, surface charge, ion release, and production of reactive oxygen species. Overall, this study clarifies the relationship between metal centers in M-MOFs and their antibacterial activity.
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