SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Yujie Chen,Rui Sun,Wenhui Zhu,Zhen Zhang,Yali Chen,Shuo Wang,Qiliang Deng
Covalent organic frameworks (COFs) with predesigned bipyridine recognition sites (donated as BPD-COFs) were prepared by using 2, 2’-bipyridine-5, 5’-diamine and benzene-1, 3, 5-tricarbaldehyde as monomers, and the corresponding small molecule model compound (2, 2’-bipyridine-5, 5’-diiminebenzene, donated as BPDB) was synthesized by using benzaldehyde and 2, 2’-bipyridine-5, 5’-diamine. The fluorescence sensing property between BPD-COFs and BPDB were compared as the fluorescence sensing platform for the sensitive, selective and rapid detection of Ni 2+ . The unique structure characteristics such as large conjugated structure, high surface area, regularity pore canals and predesigned bipyridine link endow BPD-COFs with prominent fluorescence emission, enough space and strong specificity for Ni 2+ . The fluorescence quenching degree of BPD-COFs is four times more than that of BPDB. Besides better selectivity, BPD-COFs also displays the prominent advantages, such as the wider concentration range (4.20 × 10 −10 ∼1.26 × 10 -6 M) and lower limit of detection (6.80 × 10 -11 M) compared to that of BPDB (1.00 × 10 -7 ∼5.00 × 10 -7 M, 4.50 × 10 -8 M). Good spiked recoveries (>92.0 %) in chocolate and tea support that BPD-COFs is competent to detect Ni 2+ in real samples. All these results indicate that BPD-COFs is potential as a fast, sensitive, and accurate fluorescence sensing platform for the selective detection of Ni 2+ in complex system.
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高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Deyun Zhang,Yunong Li,Jing Guo,Lixiang Zhou,Yeqing Lan,Cheng Chen
In this study, magnetic Cu and Ni bimetallic particles embedded carbon sheets, namely as C@Cu–Ni, was derived via calcining a mixture of Cu-MOFs and Ni-MOFs (mass ratio = 4:6) under N 2 protection and served as a catalyst for the degradation of 2,4,6-trichlorophenol (2,4,6-TCP) by peroxymonosulfate (PMS). The results showed that more than 98.5% of 2,4,6-TCP (10 mg L −1 ) was rapidly decomposed at initial pH = 5, PMS = 1 mM and catalyst dosage = 0.1 g L −1 within 30 min, accompanied by 42.47% removal of total organic carbon (TOC). This fully confirmed that C@Cu–Ni possessed excellent catalytic performance for PMS activation . The radical quenching experiments and electron paramagnetic resonance (EPR) investigation testified that the reactive oxygen species (ROS) included SO 4 •− , • OH, O 2 •− radicals and singlet oxygen ( 1 O 2 ), which were responsible for the rapid degradation of 2,4,6-TCP. Among them, O 2 •− and 1 O 2 played a decisive role. Cyclic voltammograms (CV) and electrochemical impedance spectroscopy (EIS) revealed that C@Cu–Ni material possessed superior electrical conductivity and electron transfer , improving its catalytic activity . What is more, C@Cu–Ni displayed excellent stability and could be consecutively used for five times without any decline of catalytic performance. The main intermediates of the 2,4,6-TCP degradation were analyzed by high-performance liquid chromatography-mass spectrometry (HPLC-MS/MS) and possible pathways of 2,4,6-TCP degradation were further proposed. The extraordinary stability and superior catalytic activity of C@Cu–Ni coupled with its easy separation from wastewater due to magnetism suggest that the newly synthesized material may offer a promising alternative approach to efficiently degrade organic pollutants by PMS.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 35
·14970-14978
·
IF 3.288
Jingchuang Zhao,Yingzhen Zhang,Xianyu Kang,Yancai Li
Direct methanol fuel cells (DMFCs) have been extensively studied for developing a new non-precious metal catalyst to replace commercial platinum catalysts, due to their expensive cost and susceptibility to CO poisoning. In this work, nanocomposites of nickel oxide/nickel supported by N-doped carbon (NiO/Ni–N/C) were prepared by using a hydrothermal method and further carbonization at different temperatures. The surface morphology and composition of the NiO/Ni–N/C nanocomposites were characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). As observed through electrochemical experiments, the NiO/Ni–N/C nanocomposite modified glassy carbon electrode (NiO/Ni–N/C/GCE) exhibits high electrocatalytic activity for the methanol oxidation reaction (MOR) in alkaline solution. Among the nanocomposites, NiO/Ni–N/C carbonized at 500 °C (NiO/Ni–N/C500) displays the highest mass activity (1043 mA mgNi−1) at 0.73 V (vs. Ag/AgCl), which is much higher than that of Ni(OH)2/N–C and NiO/Ni–N/C carbonized at other temperatures (400, 600, and 700 °C). In addition, the catalytic activity of NiO/Ni–N/C500 is 2.12 times that of the commercial Pt/C. NiO/Ni–N/C500/GCE also possesses fast kinetics, excellent stability and CO tolerance. Therefore, the NiO/Ni–N/C500 nanocomposites have great application potential as MOR catalysts.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 31
·15252-15262
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IF 3.553
Jiang Xiaoli,He Miao,Tang Mengyi,Zheng Qiaoji,Xu Chenggang,Lin Dunmin
Electrocatalytic nitrogen reduction reaction (NRR) under ambient conditions has been considered as a promising approach for green ammonia synthesis; however, non-precious metal-based catalysts with excellent NRR electrocatalytic performance have been scarce. Herein, self-supported bimetallic electrocatalysts of Ni 12 P 5 /FeP 4 nanoplates grown on carbon cloth were synthesized by a combined process of hydrothermal technology and low-temperature phosphidation. The catalyst exhibits excellent electrocatalytic N 2 fixation performance with a high NH 3 yield rate of 3.08 × 10 −10 mol s −1 cm −2 (16.40 μg h −1 mg −1 cat
), Faradaic efficiency (39.9%) as well good durability at − 0.1 V in 0.1 M Na 2 SO 4 at ambient conditions, which are attributed to the distinctive nanostructure and rational composition. Our study paves the way for expanding the scope of NRR research and designing more efficient electrochemical ammonia synthesis in the future.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Wenzhu Tang,Gaowei Zhang,Yejun Qiu
Developing catalysts based on transition metal-based materials for oxygen evolution reaction (OER), which are cheap and efficient, is one of the keys to increase the rate of electrolysis of water to produce hydrogen . Herein, we successfully synthesize iron hydr(oxy)oxide nano-arrays on carbon cloth (FeOOH@CC), and then metallic nickel is electrodeposited on its surface to fabricate FeOOH/Ni heterojunction nanoarrays. Notably, the optimal FeOOH/Ni heterojunction nanoarrays catalyst shows high electrocatalytic performance toward OER with a small overpotential of 257.8 mV at 50 mA cm −2 , a Tafel slope of 30.8 mV dec −1 and outstanding long-term stability in alkaline media . The superior OER performance could be ascribed to the introducing of metallic nickel. The nickel in-situ grows on the surface of FeOOH, which not only can improve the conductivity of FeOOH, but also cooperate with FeOOH to form the FeOOH/Ni heterogeneous interfaces for further enhancing OER electrocatalytic activities . This work provides a simple and efficient strategy of interface engineering to fabricate oxyhydroxide/metal heterojunction nanoarrays as high-efficiency OER catalysts.
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高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2020
·
IF 7.864
Xiaotong Chen,Ting Zhang,Miao Kan,Dinggui Song,Jinping Jia,Yixin Zhao,Xufang Qian
Energy consumption and long-term stability of a cathode are two important aspects of great concern in electrocatalytic nitrate reduction. This work studied a binderless FeNi/graphitized mesoporous carbon directly formed on Ni Foam (FeNi/g-mesoC/NF, 7.3 wt % of Fe) and evaluated its electrocatalytic nitrate reduction performance. We proposed a unique structure model of FeNi/g-mesoC/NF cathode in which FeNi alloy nanoparticles were uniformly embedded in mesoporous carbon and graphitized carbon shells were coated on isolated alloy nanoparticles. Oxygen vacancies (OVs) in FeNi oxide passivating layer facilitate the conversion of NO3–-N anions on cathode. Toxic NO2–-N was almost undetected due to the synergetic effects of FeNi electrocatalysis, and the NO3–-N conversion was high in comparation with ever reported iron-based cathode. The NO3–-N conversion showed ultrahigh electrocatalytic stability during one-month-recycling test while the physiochemical properties showed negligible change for FeNi/g-mesoC/NF except the increase of OVs. The energy consumption to treat simulated underground water (50% of NO3–-N conversion) was low (0.7 kWh mol–1) for 50 mg L–1 NO3–-N. This binderless composite cathode shows great potential in electrocatalytic NO3–-N removal in underground water.
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PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2020
·Vol. 26
·期 63
·14496-14501
·
IF 4.857
You Xu,Xingjie Chai,Mengying Liu,Tianlun Ren,Shanshan Yu,Ziqiang Wang,Xiaonian Li,Liang Wang,Hongjing Wang
Graphical Bifunctional electrocatalysts : Two-dimensional NiIr@N-doped carbon nanocomposites supported on Ni foam substrate function as bifunctional electrocatalysts for overall water splitting in alkaline conditions. Electrochemical water splitting can provide a promising avenue for sustainable hydrogen production. Highly efficient electrocatalysts toward the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are extremely important for the practical application of water splitting technology. Herein, a one-step annealing strategy is reported for the fabrication of a metal–organic framework-derived bifunctional self-supported electrocatalyst, which is composed of two-dimensional N-doped carbon-wrapped Ir-doped Ni nanoparticle composites supported on Ni foam (NiIr@N-C/NF). The resultant NiIr@N-C/NF displays excellent electrocatalytic performance in 1.0 m KOH, with low overpotentials of 32 mV at 10 mA cm −2 for the HER and 329 mV at 50 mA cm −2 for the OER. Particularly, the HER-OER bifunctional NiIr@N-C/NF needs only 1.50 V to yield 10 mA cm −2 for overall water splitting.
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PubMed
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2020
·
IF 3.442
Lina Feng,Ping Yang,Wenqin Ling,Shaohua Wang,Jianjun Shi,Fengwu Wang
A hydrothermal method was used to prepare a hierarchical flower-like NiMoO 4 @Ni 3 S 2 composite on a three-dimensional Ni foam substrate, and the effects of different amounts of ethylene glycol in the precursor solution on the morphology and performance of Ni@NiMoO 4 @Ni 3 S 2 were investigated. The as-synthesized No-10/Ni 3 S 2 electrode exhibits a specific capacity up to 870 C g −1 at 0.6 A g −1 and excellent cycle stability (capacity retention of 81.2% after 8000 cycles). More importantly, in a hybrid supercapacitor with a No-10/Ni 3 S 2 as a positive electrode and activated carbon (AC) as a negative electrode (No-10/Ni 3 S 2 //AC), the energy density of 128.31 W h kg −1 at a power density of 7106.4 W kg −1 . As displayed, the performances make No-10/Ni 3 S 2 a promising candidate as high-performance electrode material for supercapacitors .
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高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2020
·Vol. 50
·期 11
·1091-1099
·
IF 2.384
Fa Dejuan,Miao Yuqing
Abstract The NiHPO 4 –Ni(OH) 2 nanowire-assembled bouquets were easily synthesized. Scanning electron microscopy and transmission electron microscopy show the NiHPO 4 –Ni(OH) 2 bouquets form through the organization of nanowires which arrange with certain direction. The electrocatalytic activities of NiHPO 4 –Ni(OH) 2 –GCE towards the oxidation of methanol and urea were studied in NaOH. The nanowire-assembled bouquets were modified on the surface of the glassy carbon electrode, leading to the increase on the surface area of the electrode, which in turn enhanced the current density and electrocatalytic performance for the oxidation of methanol and urea. It shows the potential applications for the utilization of these energy molecules. Graphic abstract
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
De-Yu Gao,Zan Liu,Zhi-Lin Cheng
The crucial challenge of 2D inorganic nanomaterials-filled composite hydrogel with outstanding mechanical properties was concentrated on the surface modification that was capable to access a better interface between 2D inorganic nanomaterials and hydrogel in past. In this paper, for the first time, we extensively studied the application of as-synthesized 2D Ni-Fe MOF nanosheets with natural organic interface and interlayer structure in PVA hydrogel. The morphology and structure of the as-prepared 2D Ni-Fe MOF/PVA composite hydrogels were determined by a series of characterizations. The results indicated that the as-prepared 2D Ni-Fe MOF/PVA composite hydrogel with porous structure exhibited a desirable dispersion due to the existence of the potential interfacial interaction. Furthermore, the swelling, mechanical and tribological properties of the composite hydrogel were intensively investigated. Dramatically, the tensile strength and compression modulus of the as-prepared 2D Ni-Fe MOF/PVA with 0.1 wt.% filling content were increased by 62.5 % and 113 % relative to pure PVA hydrogel, respectively. Owing to the presence of the interlayer structure of 2D Ni-Fe MOF nanosheets, the friction coefficient of the 2D Ni-Fe/PVA composite hydrogel with 0.15 wt.% filling content was reduced by 41 % compared to pure PVA hydrogel.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Boya Hao,Zhiguo Ye,Jilin Xu,Liangliang Li,Juntong Huang,Xinyuan Peng,Duosheng Li,Zhong Jin,Guang Ma
Transforming the intermittent solar and wind energies into green hydrogen energy by water electrolysis is deemed to be a promising approach to substitute traditional fossil energies. However, the scarcity of precious IrO 2 /RuO 2 -based metal oxides for oxygen evolution reaction hinders the large-scale utilization. Here, based on the nanoscale Kirkendall effect , we fabricate nanoporous γ-Ni based solid solution with the simulated FeCoNi surface compositions of Gibeon meteorites by a facile microwave sintering method. A metal (oxy)hydroxide layer with a thickness of approximately 9 nm was formed on the surface of as-prepared electrode after aging, achieving an overpotential of only 254 mV at 10 mA cm −2 and a low Tafel slope of 37.0 mV dec −1 . The electrode exhibits outstanding long-term stability in a wide range of current densities without compromising the electrocatalytic activity, which is attributed to the 3D-interconnected nanoporous structure, synergistic effect of different species, high conductivity and excellent wettability . The fabrication of nanoporous non-precious solid solution architectures which mimic naturally-formed materials provides a feasible strategy for the design of high-performance electrocatalysts towards clean energy applications.
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高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 151
·期 7
·2144-2152
·
IF 3.186
Guo Yu,Tian Long,Yan Wangwei,Qi Ronghua,Tu Weixia,Wang Zhou-jun
Abstract Three typical methods, subsequent coating, co-impregnation and sequential impregnation, were employed to investigate the effect of introduction methodologies for CeO 2 -promoted Ni/SiO 2 catalysts. The CeO 2 @Ni/SiO 2 catalyst prepared with the subsequent coating method was found to exhibit the best initial activity and superior long-term stability in CO 2 reforming of methane. Comparative characterizations documented that small Ni size and intimate Ni–CeO 2 contact were generated on the CeO 2 @Ni/SiO 2 catalyst, leading to excellent reforming activity. In addition, pronounced redox property and strong surface basicity were created on the CeO 2 @Ni/SiO 2 catalyst, resulting in exceptional coke resistance and thus superior long-term stability. This work unravels the impact of various introduction methods on the catalyst structure, which would help design robust nanocomposite catalysts with outstanding catalytic performance. Graphic Abstract
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高影响因子
危险品化学品经营许可证（带存储）