SEPARATION SCIENCE AND TECHNOLOGY
·
2023
·
IF 2.8
Mingjian Wang,Meiqing Zeng,Pingsan Wang,Yaochi Liu
The efficiency of Ni(II) removal from electroplating wastewater is highly correlated with different adsorption materials. A Ca-Si activated mineral adsorbent (CSAM) and two ion-exchange resins (732 and D152) were compared. The adsorption of Ni (II) by three materials is spontaneous and endothermic, and their adsorption capacities are similar (48.66–65.36 mg/g at 318K), but the dosage of CSAM is less (1.0 g/L for 50 mg/L Ni(II)), its adsorption is faster (<5 min) and pH range is wider (2–7). 10% NaCl, 1 mol/L HCl and 10% NaCl +1 mol/L HCl were used as desorbent agents, and CSAM exhibited an extremely low desorption rate (1.49–3.41%). The smaller separation factor (close to 0) and XPS analysis showed that the Ni(II) adsorption on CSAM was an irreversible chemical process, which was different from the three-stage adsorption of resins. The treatment of two kinds of electroplating wastewater with high and low concentration showed that CSAM not only had a higher Ni(II) removal rates (>98.4%), but also could efficiently remove Cu(II) (>98%), total-chromium (>79%) and COD (>66%). The treatment of Ni(II) containing electroplating wastewater with ion-exchange resins is greatly affected by the complexing agent. CSAM is more suitable for the treatment of electroplating wastewater containing various metals and organic matters.
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高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Haiyan Wang,Yanan Chen,Wenfu Xie,Xiaoxue Han,Qian Feng,Rong Jiang,Hu Shang,Feifei Zhang,Linna Gao,Zonghua Wang
A novel Pt/Ni-Fe layered double hydroxide (Pt/Ni-Fe LDH) electrocatalyst was fabricated by a two-step facile process for oxidation of methanol in alkaline medium. It is found that Pt/Ni-Fe LDH electrocatalyst exhibits higher electrocatalytic activity, better anti-poisoning ability and stability for methanol oxidation comparing to pure Pt black and commercial Pt/C catalyst. Such an enhancement is probably attributed to the synergistic effect of Ni-Fe LDH and the uniform loading of Pt nanoparticles on the LDH layers. When ionic liquid (IL) was introduced to the composites, the prepared Pt/IL/Ni-Fe LDH exhibits even better electrocatalytic behaviors (205.6 mA mg -1 Pt, I f /I b=5.67) than the Pt/Ni-Fe LDH. Moreover, the morphology and structure of composites were characterized using scanning electron microscope equipped with an energy dispersive X-ray spectrometry, transmission electron microscope, X-ray diffraction, and FT-IR spectra. It is found that the Ni-Fe LDH have a flake-like morphology, the mean diameter of Pt nanoparticles in Pt/Ni-Fe LDH and Pt/IL/Ni-Fe LDH electrocatalyst is 4.36 nm and 3.09 nm, smaller than that in pure Pt black and commercial Pt/C electrocatalyst (8.70 nm and 6.48 nm).
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
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IF 9.9
Liming Chen,Lianmei Kang,Dandan Cai,Shipeng Geng,Yangyang Liu,Jian Chen,Shuqin Song,Yi Wang
Although Pt is a widely adopted commercial catalyst for the hydrogen evolution reaction (HER), its practical application is greatly limited by its prohibitive cost and high energy barrier for H 2 O dissociation in alkaline media. Herein, an ultrafine Pt-based catalyst decorated with oxygenophilic Ni-sites is rationally designed and successfully synthesized with Pt 5 (GS) 10 (HGS = l -reduced glutathione) nanocluster precursor. The optimized Ni-decorated Pt catalyst (Ni-Pt-C-500) with ultrafine nanoparticles (about 1.6 nm) exhibits a low overpotential (14.0 mV) at 10 mA cm −2 and a mild Tafel slope of 20.8 mV dec −1 in the HER, which is superior to its undecorated counterpart (Pt-C-500), the commercial 20 wt% Pt/C catalyst and most of the previously reported Pt-based electrocatalysts. Experimental observations and theoretical calculations indicate that H 2 O could be spontaneously adsorbed to Ni-sites of the Ni-Pt-C-500 catalyst. Mechanistic studies reveal that Ni-sites promote HER by accelerating the kinetic of H 2 O cleavage and optimizing the electronic structure of Pt. This work paves a new avenue for designing other ultrafine hybrid electrocatalysts based on metal nanoclusters to enhance catalytic reaction kinetics.
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PubMed
高影响因子
Flexible and Printed Electronics
·
2023
·Vol. 8
·期 2
·025021
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IF 3.1
Lipeng Huang,Xiaolian Chen,Xinzhou Wu,Zishou Hu,Shuhong Nie,Chenchao Huang,Shuo Zhang,Wenya Xu,Fangfang Pei,Wenming Su,Zheng Cui
Flexible electrochromic technology has gained numerous attentions in flexible smart wearable devices and flexible displays. For large-area flexible electrochromic devices (FECDs), highly conductive transparent electrodes with advanced stability at a prolonged redox cycling process are indispensable. In this work, a silver (Ag)/nickel (Ni) mesh/PH 1000 hybrid transparent film were successfully fabricated by selectively electrodepositing an 800 nm-thick dense metallic Ni layer and coating PH 1000 on an embedded Ag mesh to improve its electrochemical stability. The prepared hybrid transparent film presented high conductivity with a sheet resistance of below 1.5 Ω sq−1 at over 80% optical transmittance. The Ag/Ni mesh/PH 1000 was successfully utilized as current collectors for all-solid-state FECDs, showing fast coloration switching with a bleaching/coloring time of 0.7 s/0.9 s. In addition, the device demonstrated an exceptional electrochemical cycling stability, which could sustain 89% of its initial optical modulation after 25 000 cycles. More importantly, a remarkable mechanical durability was also achieved with a small optical modulation decay of 15% and an invariable response time after 1000 rolling cycles. In addition, uniform coloration were realized on a 6 × 6 cm2 FECD, demonstrating its great potential for applications of next-generation up-scaling FECDs.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 36
·16819-16827
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IF 3.3
Yue Feng,Yu Chen,Lan Yang,Ningna Chen,Ruiqing Liu,Xiujing Lin,Wencai Wang,Xiaomiao Feng
Transition metal nitrides (TMNs) are promising electrode materials for high-performance energy storage devices owing to their excellent conductivity, thermal stability, high theoretical capacity and excellent electrochemical activity. However, the structural instability present in the electrochemical reaction process significantly limits their widespread application. Herein, we present a V–Ni-based nitride heterojunction on carbon cloth (VN/Ni3N–Ni/CC) as an active electrode material for flexible supercapacitors. The VN/Ni3N–Ni/CC composite electrode was successfully fabricated through controllable nitridation of the corresponding vanadium–nickel oxide grown on carbon cloth (V–Ni–O/CC) precursors. The electrochemical results reveal that the areal capacitance of the VN/Ni3N–Ni/CC based supercapacitor with a nitriding temperature of 400 °C and a nitriding time of two hours can achieve a maximum areal capacitance of 845.63 mF cm−2 at a current density of 0.5 mA cm−2, and the electrode in the three-electrode system retains 86.1% of its initial capacitance value after 1500 cycles at a current density of 10 mA cm−2. In addition, the assembled flexible all-solid-state symmetric supercapacitor using the VN/Ni3N–Ni/CC electrode exhibits an areal capacitance ratio of 19.1 mF cm−2 at a current density of 0.4 mA cm−2 and excellent cycling stability. Moreover, it displays exceptional flexibility under different bending angles highlighting its potential for integration into flexible electronic devices.
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INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Xiaohui Yang,Chengjun Tang,Lihong Hu,Yonghong Zhou,Minghao Zhou
The industrial production of monophenols was mainly dependent on fossil resources, due to growing energy demand and escalating environmental issues, more efficient and sustainable strategy, such as utilization of biomass as raw materials to economically produce monophenols, was desired, which could liberate us from the reliance on fossil resource and was of great industrial and social significance. Herein, a novel strategy was reported to produce biomass-derived monophenols from lignin by directly deconstructing C-O bond under mild conditions. A series of NiM-MOFs (M=Co, Mo, and Cu) derived bimetallic catalysts were synthesized via a simple hydrothermal method, which were characterized by XRD , SEM , TEM , XPS and NH 3 -TPD. The synergistic effect between the Ni and Mo greatly improved the catalytic activity and inhibited the transformation to by-products. In addition, we explored a new binary solvents system of MeOH-THF to effectively enhance the selectivity of monophenols. Under optimal catalytic conditions, Ni4Mo1/C-BN catalyst could break the C-O bonds in lignin dimer under 160 ℃ to afford phenol and benzoic acid , and the possible reaction pathway was proposed. The high yield of lignin oil from the oxidation of various realistic lignin also confirmed the superiority of this catalytic system. The lignin depolymerization products were characterized by element analysis, GPC and GC-MS, confirming the presence of mainly guaiacyl-type (G) products, while the highest yield was assigned to vanillin.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Bai Jiang,Na Li,Yan Wang,Zuming Hu,Jing Zhu,Junrong Yu
In order to deal with the more complex electromagnetic radiation environment, there is highly desirable to manufacture a high-performance electromagnetic shielding material with excellent electromagnetic shielding efficiency, flexibility, thermal properties, fatigue resistance , and other qualities. In this paper, we fabricated an ultralight, flexible, and heat-resistant poly-m-phenylene isophthalamide (PMIA)/Ag nanowires(AgNWs)/Ni composite nanofiber film via electrospinning, spray coating, and electroless plating . Compared with different AgNWs spraying contents, the highest electromagnetic shielding effectiveness, about 96 dB with a thickness of ∼150 µm, is generated by spraying 33.333 mg/cm 2 AgNWs suspension. Additionally, because of the benefit of the PMIA, this PMIA/AgNW/Ni composite membrane maintains a constant EMI SE value (over 90 dB) after a high-temperature process under 200 °C, which only decreases by 3.33 %. The excellent performance of the material is due to its large porosity and sandwich structure, which can dissipate electromagnetic waves within the material, with only a very small portion of the electromagnetic waves passing through it. Therefore, this material has a potential application for use in diverse harsh settings.
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Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Xinyue Mao,Qingnan Meng,Mu Yuan,Sifan Wang,Shiyin Huang,Baochang Liu
The weak interfacial strength between Fe-based matrix and diamonds causes diamond particles to fall off prematurely, significantly affecting the cutting efficiency of diamond composites. This work aimed to optimize the interfacial microstructure and mechanical properties of the diamond/Fe-Ni-WC composites by coating a Mo 2 C layer on the diamond particles. The Mo 2 C-coated diamonds were prepared via the molten salt method. Diamond/Fe-Ni-WC composites were sintered by the hot-pressing process under a vacuum. The bending strength of composites with Mo 2 C-coated diamonds was improved from 804 to 996 MPa with the increased coating time. The energy dispersive spectroscopy scanning indicated that the Mo 2 C coating layer changed the interfacial composition between the matrix and the diamonds from Fe–C alloy to Mo 2 C, improving the interface strength. Moreover, the diamond protrusion heights of composites were raised by adding a Mo 2 C interface, resulting in an improvement in the cutting efficiency of impregnated diamond tools.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Mengde Li,Xianyan Jiang,Junjie Liu,Qian Liu,Ningjie Lv,Ning Qi,Zhiquan Chen
In this paper, a Co/Ni bimetallic metal-organic framework (ZIF-67 @Ni-salicylate) is successfully synthesized through a two-step method. By increasing the reaction time to 48 h, the effect of the hydrothermal treatment on structure changes and electrochemical properties of ZIF-67 @Ni-salicylate is demonstrated. Electrochemical measurements show that the ZIF-67 @Ni-salicylate hydrothermal-treated with 48 h possesses a high specific capacitance of 1493 F g −1 at 1 A g −1 and simultaneously excellent cycle stability. Impressively, the capacitance retention rate can reach 86.8% even under a high current density of 40 A g −1 , which is much better than that in previous reports. Furthermore, an asymmetric supercapacitor (ASC) is assembled and two ASCs connected in series can light up a red LED for more than 30 min as demonstrated by the current-time curve. Our work will be useful for the preparation of high-performance supercapacitor electrode materials.
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JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Ze Wang,Pei Shi,Qin Liu,Jingying Li,Yi Gan,Jia Yao,Jinghong Xia,Xin Liu,Xin Chen,Ke Qian,Xiang Liu,Lin Lv,Guokun Ma,Li Tao,Jun Zhang,Hanbin Wang,Houzhao Wan,Hao Wang
Alkaline nickel-zinc batteries have attracted more attention due to their inherent safety and high specific energy. However, the cycling stability of Ni–Zn batteries is still an urgent problem. Herein, we fabricate the Ni 12 P 5 @PANI core-shell structure by polyaniline cladding on the Ni 12 P 5 nanowires . The polyaniline not only effectively improves the specific capacity of Ni 12 P 5 , but also greatly enhances the cyclic stability. The optimized Ni 12 P 5 @PANI nanowires provide a specific capacity of 272.8 mAh g −1 at 1 A g −1 (189.2 mAh g −1 at 10 A g −1 , 69.4% retention rate) and long-life cycling (93% capacity retention after 1000 cycles at 10 A g −1 ). Moreover, the theoretical calculations indicate that the polyaniline is easy to polymerize on the surface of Ni 12 P 5 , and the lower formation energy verifies that the polyaniline shell layer can effectively promote the structural stability of Ni 12 P 5 , thus enhancing the cycle life. In addition, the assembled Ni 12 P 5 @PANI//Zn battery retains 112.3% capacity retention after 500 cycles at 3 A g −1 , and provides a high energy density of 287.9 Wh kg −1 and power density of 49.1 kW kg −1 (based on the mass of active substance). This work provides a feasible high-rate and durable cathode material for alkaline Ni–Zn batteries.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Qi Wang,Jing Du,Yuan-Yuan Ma,Xiao-Yu Yin,Ze-Yu Tian,Zhan-Gang Han
Electrocatalytic hydrodechlorination (EHDC) provides a promising approach to efficiently remove the halogenated organic pollutants in water. Herein, a kind of noble-metal-free three-dimensional (3-D) hierarchical nickel-tungsten carbide (Ni-WC) heterostructure supported on nickel foam (NF) (Ni-WC/NF) was fabricated via the in-situ hydrothermal growth and annealing treatment of Ni,W-rich polyoxometalate {Ni 54 W 72 }. Featuring self-supported 3-D hierarchical skeleton structures and abundant Ni-WC interfaces, Ni-WC/NF exhibited high-efficient EHDC performance towards 4-chlorophenol (4-CP) with 100 % conversion efficiency in 3 h, large reaction rate constant of 2.2 × 10 -2 min −1 and high current efficiency of 13.9 %, which is comparable to the-state-of-the-art Pd-based catalysts. The active atomic hydrogen (H*) generation kinetics and the interactions of Ni-WC heterostructure with 4-CP/phenol were evaluated. DFT calculations demonstrated that the coverage of 4-CP determines the EHDC efficiency, the Ni-WC heterostructure optimizes the electronic structure of Ni, enhances the adsorption of 4-CP and facilitates the desorption of phenol, thus promoting EHDC performance. This work provides an efficient noble-metal-free catalyst for enhanced electrochemical dechlorination in organic-pollutant treatment.
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高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Yijian Zhao,Xin Wang,Yanqiang Chen,Qinzhi Wang,Zhiyi Yao,Li Wang
Surface-enhanced Raman scattering (SERS) enables food contaminants monitoring become facile and efficient. Herein, a facile strategy of integrating three-dimensional Ni form with Co/Ni bimetal-organic frameworks combining Ag nanoparticles via electrochemical synthesis method was proposed to develop a high-performance SERS substrate (CoNi-ZIFs@Ag@NF) for efficient detection of tetracycline. The flexible Ni foam (NF) acted as scaffold which can contribute to dramatically enhancing intrinsic electrical conductivity and endowing prepared substrate with high stability and uniform distribution of Ag nanoparticles. Furthermore, the pre-concentration effect of CoNi-ZIFs@Ag@NF for target molecules enhanced SERS performance dramatically. Besides, tetracycline was sensitively detected using CoNi-ZIFs@Ag@NF with low limit of detection (1.0 × 10 -11 M) and wide linear detection range (10 -10 – 10 -5 M) in aqueous solution. Also, the satisfactory recovery (94.45 – 114.25 %) was realized with less than 6.78 % of RSD in real samples. This method would provide a potential and high-performance substrate for SERS monitoring of tetracycline in food and environment.
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