Surfaces and Interfaces
·
2021
·
IF 4.837
Zepeng Fang,Dagui Chen,Fengpo Yan,Jiangquan Lv,Yongjing Wang,Xiangfeng Guan
The water monitoring parameter of chemical oxygen demand (COD) is a universal way to assess organic pollution in aqueous systems. Though the ways for the detection of COD have been developed for decades, it is still a challenge to achieve highly sensitive and portable COD detectors. In this work, a new electrode composite of Ni/ZnO/Cu (CE-1) was prepared for the electrochemical tests of COD. The electrode was structural characterized by using scanning electron microscope (SEM), transmission electron microscope (TEM), and X-ray Diffractometer (XRD), which showed that self-supported Cu microflowers were successfully electrodeposited on the ZnO micro-prims that were firstly loaded on the Ni foils. The electrochemical behaviors were investigated with the comparison of CE-1 and the electrode that Cu nanoparticles were directly deposited on the Ni foil (CE-2). It shows that CE-1 possesses much superior electrochemical properties than CE-2, which indicates that the introduction of ZnO micro-rod the electrode can significantly enhance the electrocatalysis property. CE-1 exhibited a linear COD detection range of 2.3603 to 577.8 mg/L as well as an excellent correlation with the classic dichromate method (R 2 = 0.99933). Moreover, low detection limit of 0.6036 mg/L (the signal blank/slope=3) and high sensitivity of 2.403 × 10 −2 mA / (mg • L −1 ) can be simultaneously achieved by using CE-1, which is hard to attain for its counterparts reported in literature. CE-1 also shows good concordance with the classic method for real water sample detections. Consequently, the environmentally friendly CE-1 is supposed as a promising candidate for COD detection electrode.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Wei Zeng,Xiaojia Zhang,Chunyang Yang,Chengzhi Zhang,Huimin Shi,Jin Hu,Yanli Zhao,Wenjing Zhang,Guanhua Zhang,Huigao Duan
Alkali metal anodes are promising anodes for constructing novel battery systems with high energy density. Nevertheless, limited nucleation sites and nonuniform local electric field caused dendrites growth and unlimited volume expansion hindered their practical implementation during electrochemical plating/stripping. Herein, a 3D N-doped carbon nanofiber skeleton wrapped with Ni nanoparticles encapsulated carbon nanotubes (CNTs-Ni@NCFs) is prepared by hydrothermal process and followed catalytic reaction under ethanol atmosphere to construct a superior Li/Na-philic host with stable chemical properties. The 3D NCF networks serve as a primary framework, providing sufficient voids for alkali metal deposition and rapid electron and ion transport. The Li/Na-philic Ni nanoparticles and catalyzed CNTs on CFs provide evenly distributed nucleation sites and uniform local electric field, leading to dendrite-free Li deposition, which is confirmed by theoretical calculations. Because of the guided deposition behavior and bare volume change, the CNTs-Ni@NCFs anode delivers an extremely low nucleation overpotential in the initial deposition and a superior plating/stripping voltage hysteresis under a high current density of 30 mA cm −2 for 300 cycles. The CNTs-Ni@NCFs-Li full cell with LiFePO 4 cathodes demonstrates 94.2% capacity retention after 200 cycles under 2 C. When coupled with Na 3 V 2 (PO 4 ) 3 cathode, the CNTs-Ni@NCFs-Na cell shows a good suitability in full cell. This work shed new light on fabricating novel stable alkali metal anodes, which may also pave the way toward to other practical applications with high energy densities, such as in Li-air and Li-S batteries, etc .
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Zhengjie Gong,Tao Ma,Feng Liang
Organic dyes and nitrophenols in the textile industry are wastewater pollutants. In order to develop an efficient nanocatalysts to remove organic pollutants in wastewater, the trimetallic Ni@Cu@Pd nanoparticles (Ni@Cu@Pd NPs) with a blackberry-like structure was successfully prepared by a seed mediated growth method for the first time. The blackberry-like structure and the presence of Ni, Cu and Pd have been confirmed through TEM, SEM, EDS and XPS characterizations. Owing to the charge interaction between metal species along with blackberry-like structure, trimetallic Ni@Cu@Pd NPs delivered a record high catalytic activity toward the reduction of rhodamine B (RhB), with an apparent rate constant of 7.20 min −1 . Ni@Cu@Pd NPs also exhibited high activity for the catalytic reduction of methylene blue (MB) and 4-nitrophenol (4-NP). Moreover, the Ni@Cu@Pd NPs catalyst showed excellent stability and reusability.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 24
·2100290
·
IF 18.808
Guanhua Zhang,Jin Hu,Yan Nie,Yanli Zhao,Lei Wang,Yizhou Li,Huaizhi Liu,Lizhen Tang,Xianan Zhang,Du Li,Ling Sun,Huigao Duan
Flexible and lightweight supercapacitors with superior mechanical flexibility and outstanding capacity are regarded as an ideal power source for wearable electronic devices. Meanwhile, incorporating additional novel characters such as transparency and electrochromism can further benefit the development of smart supercapacitors. Nevertheless, the application of the commonly used planar-structural current collectors is seriously restricted by their intrinsic properties such as poor rigidity, large thickness, and limited loading surface area. Flexible and ultralight current collectors with 3D architecture, high conductivity, and easy integration are believed to be the most appropriate alternatives to build high-performance supercapacitors. In this study, a novel and scalable manufacturing technique is developed to produce a flexible and ultralight 3D Ni micromesh (3D NM) current collector for supercapacitor. Flexible smart supercapacitor integrated by 3D NM and high active Ni–Co bimetallic hydroxide (3D NM@NiCo BH) delivers a considerable rate performance (60.6% capacity retention from 1 to 50 mA cm −2 ). Furthermore, the fabricated hybrid supercapacitor device integrated with electrochromic functionality can visually indicate the energy level by a color display. This flexible electrochromic supercapacitor based on ultralight 3D Ni micromesh provides a novel insight into multifunctional energy storage systems for smart wearable electronic devices.
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FUEL
·
2021
·
IF 6.609
Yiran Wang,Yuewen Shao,Lijun Zhang,Shu Zhang,Yi Wang,Jun Xiang,Song Hu,Guangzhi Hu,Xun Hu
Hydrophilicity/hydrophobicity is one of the most important parameters in heterogenous catalysts, as it significantly impacts the adsorption and activation of the reaction substrate. In this study, we have demonstrated that the treatment of the biochar derived from the pyrolysis of rice husks with HNO 3 oxidation and subsequent thermal treatment could remarkably increase the overall hydrophobicity of the Ni catalyst termed as Ni/biochar (treated). However, owing to the un-uniform surface of the biochar, some hydrophilic sites also exist. The co-presence of the hydrophobic and hydrophilic sites in the Ni/biochar (treated) facilitates the adsorption/activation of the C O functionality in vanillin and the aliphatic C C in eugenol. This renders the Ni/biochar (treated) catalyst with the much higher activity for hydrogenation of the unsaturated bonds than the Ni/biochar (un-treated) catalyst with mainly the hydrophilic sites. The reaction substrate like 1-chloro-2-nitrobenzene that could not form strong hydrogen bond with the biochar was less sensitive to the hydrophilicity/hydrophobicity of the catalyst. The results herein provide some reference information for optimizing catalytic performance via tailoring surface properties.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2021
·
IF 5.302
Yuqian Wang,Qiuyu Cheng,Peng Jiang,Lin Liu,Kunyang Cui,Yong Li
Solid solutions based on BaAl 12- x M x O 19 (M = Co 2+ , Ni 2+ ) showing intense blue shades were successfully synthesized by conventional solid state reaction. Then, novel zirconia ceramic materials with intense blue hues were then prepared upon addition of 5 wt% of the synthesized chromophore to a ZrO 2 white matrix containing 5 wt% Y 2 O 3 and sintered at 1400 °C for 6 h. The colors of the BaAl 12- x Co x O 19 or BaAl 12- x Ni x O 19 are due to the d-d transitions of Co 2+ or Ni 2+ in tetrahedral coordination, respectively. The colored zirconia ceramics were all indexed with tetragonal phase. The coexistence of the chromophore and ZrO 2 were observed by scanning electron microscopy and energy dispersive spectrometer. The hardness of the as-synthesized blue zirconia ceramic was slightly higher as compared to the pure undoped sample.
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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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2021
·
IF 5.234
Xiaoyu Zhang,Ying Liu,Xiaobo Liu,Jingfan Zhang,Xin Chen,Yanxia Wu,Lin Jing,Xiaolei Wu,Min Zhao,Peide Han
Few-layer graphene reinforced nickel matrix (GNs/Ni) composites were fabricated by a facile in-situ processing strategy involving the transformation from solid carbon precursors to graphene reinforcements under the vacuum hot-press sintering. It enabled the homogeneous distribution of reinforcements, the effective interfacial bonding between graphene nanosheets and Ni matrix, as well as the resisted grain growth during the high-temperature consolidation process. The GNs/Ni composites exhibited exceptionally enhancement of the strength and ductility simultaneously. The composite with 0.3 wt% graphene achieved the optimal yield strength, tensile strength , and fracture elongation of 285 MPa, 611 MPa, and 56%, respectively, which were enhanced by 1.16, 1.34 and 1.37 folds compared to those of pure Ni bulk. The microstructures before and after tensile deformation demonstrated that the strengthening effect of in-situ grown graphene in the Ni matrix was attributed to the grain refinement and effective load transfer, while the toughening effect was related to the crack bridging and graphene pull-out mechanisms.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Zonglin Liu,Baoqiang Li,Yujie Feng,Dechang Jia,Caicai Li,Qingfeng Sun,Yu Zhou
Reasonable design and facile synthesis of high-efficiency non-noble electrocatalysts for hydrogen evolution reaction (HER) in water splitting are crucial for renewable and clean energy technologies. Increasing the number of active sites via nanostructuring is a fundamental method to promote the HER activity of the catalysts. However, the balance between the exposed active sites and the stability cannot be well maintained due to the aggregation of nanoscale catalysts. Therefore, it is imperative to combine effective active compounds with suitable carbon materials to stabilize nanomaterials. Hence, a hybrid architecture with Ni(PO 3 ) 2 nanoparticles ladened on the carbon nanotubes (Ni(PO 3 ) 2 /CNTs) was elaborately designed and synthesized by pyrolyzing the nickel phthalocyanine (NiPc)/CNTs assemblies and subsequent phosphidation. The π-π interaction between NiPc and CNTs is conductive to the tight attachment of the active species to the substrate, while the inlaid structure effectively prevents the corrosion/aggregation of Ni(PO 3 ) 2 nanoparticles and ensures the stability of the catalyst. Accordingly, Ni(PO 3 ) 2 /CNTs displayed excellent HER performances with remarkable stability both in 1.0 M KOH and 0.5 M H 2 SO 4 with overpotentials of 71 mV and 87 mV at 10 mA cm −2 , respectively. The Tafel slopes of Ni(PO 3 ) 2 /CNTs in alkaline and acid medium were 65 mV dec -1 and 46 mV dec -1 , respectively, both exposed a Volmer-Heyrovsky mechanism during the HER. The present work will shed new light on the exploitation of non-noble metal high-efficiency HER electrocatalysts.
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高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yang Wang,Yingying Wei,Pengcheng Gao,Si Sun,Qian Du,Zhifei Wang,Yong Jiang
Magnetic material is considered to as a major concern material for the enrichment of histidine-rich proteins (His-proteins) via metal-ion affinity. In this work, magnetic polymer microspheres with core–shell structure (Fe3O4@PMAA@Ni) were successfully prepared via reflux-precipitation polymerization followed by in situ reduction and growth of Ni2+. The obtained Ni nanofoams with flower-like structure and uniform pore size (3.34 nm) provided numerous binding sites for His-proteins. The adsorption performance of Fe3O4@PMAA@Ni microspheres for His-proteins was estimated via selectively separating bovine hemoglobin (BHb) and bovine serum albumin (BSA) from a matrix composed of BHb, BSA, and lysozyme (LYZ). The results indicated that Fe3O4@PMAA@Ni microspheres could efficiently and selectively separate His-proteins from the matrix, with a maximum adsorption capacity of ∼2660 mg/g for BHb. Moreover, Fe3O4@PMAA@Ni microspheres exhibited good stability and recyclability for BHb separation over seven cycles. Therefore, this work reported a novel and facile strategy to prepare core–shell Fe3O4@PMAA@Ni microspheres, which was promising for practical applications of His-protein separation and purification in proteomics.
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PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Ping Li,Ran Chen,Shien Zhao,Wenqin Li,Yunan Lin,Yu Yu
Exploring cost-effective yet high-performance catalysts for dehydrogenation of ammonia borane (AB) is highly desirable for hydrogen economy. Transition metal nitrides (TMNs) have received huge attention in various energy storage/conversion systems, yet utilization for AB dehydrogenation is rarely studied. Herein we propose a green approach to Co doped Ni nitride nanoparticles anchored on reduced graphene oxide nanosheets (rGO/CoNi-N) from a bimetal-organic complex. The resultant rGO/CoNi-N presents outstanding catalytic AB dehydrogenation performance with a turnover frequency (TOF) value of 126.0 min −1 and an activation energy (Ea) of 32.8 kJ mol −1 , rivalling state-of-the-art catalysts. Based on experimental and theoretical investigations, remarkable performance of rGO/CoNi-N can be attributed to full exposure of active sites and favorable mass transfer. Significantly, Co species incorporation in Ni-N can modulate electronic state with upshift of the d-band center, leading to promoted H 2 O adsorption and reduced energy barrier of the rate-determining step (H 2 O dissociation), thereby substantially boosting AB hydrolysis.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jiaming Wang,Guilong Liu,Huixian Zhong,Pengfei Song,Kang An,Ziyang Zhang,Ang Cao,Yuan Liu
In this work, Co δ+ -Co 2 C decorated-Co-Ni alloy nanoparticles (NPs) loaded on Mg-Al-O complex oxides were fabricated via an in-situ reduction and topochemical carbonization strategy by using hydrotalcite as the precursor. The Co δ+ -Co 2 C decorated-Co-Ni alloys were obtained via the following process: (I) after reduction, Co-Ni alloy was obtained and Co could donate electrons to Ni in the Co-Ni alloy NPs; (II) in syngas atmosphere, some of cobalt atoms on the surface of Co-Ni NPs reacted with CO and were converted to Co 2 C. Resultantly, in the reaction process, Co-Ni alloy NPs were transformed into Ni-Co alloy@Co-Co 2 C, a core-shell structure with Ni-Co alloy core and Co-Co 2 C shell. When used as the catalysts for direct ethanol synthesis (DES) from syngas, the bimetallic Co-Ni alloy@Co-Co 2 C catalyst performed excellent selectivity to ethanol, owing to the regulation of dissociatively and associatively adsorbed CO by Co δ+ -Co 2 C active sites formed on the surface of Co-Ni alloy NPs. Moreover, the mutual dilution between Co and Ni in the Co-Ni alloy NPs inhibited the generation of heavy hydrocarbons, further improving the selectivity to alcohols. The total alcohol selectivity of 43.0% and ethanol occupied 45.2 wt% could be reached over the optimal catalyst.
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高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 29
·10059-10066
·
IF 4.39
Xuejuan Xu,Yuchi Zhang,Yide Han,Junbiao Wu,Xia Zhang,Yan Xu
A hierarchical hollow Ni/Co-codoped MoS2 architecture was successfully prepared using a Ni/Co Prussian Blue analogue as the precursor followed by the solvothermal-assisted insertion of MoS42− and extraction of [Co(CN)6]3− at 200 °C for 32 h. The obtained Ni/Co-codoped MoS2 composite exhibited a hollow microcubic structural characteristic, and the morphology, structure, and chemical compositions were carefully characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS), respectively. The Ni/Co-codoped MoS2 composite used as an electrode material featured excellent glucose sensing activity and a high sensitivity of 2546 μA mM−1 cm−2 with a relatively low detection limit of 0.69 μM (S/N = 3). In addition, the Ni/Co-codoped MoS2 composite showed good anti-interference sensing performance in the presence of ascorbic acid (AA), lysine (Lys), cysteine (Cys), urea, H2O2, KCl, and other interferents. These experimental results revealed that the composite is a promising electrode material for enzyme-free glucose sensing, and the feasible synthetic strategy may provide an effective and controlled route to prepare other multi-metal substituted sulfide-based hierarchical structures with high electrochemical sensing performance.
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PubMed
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