JOURNAL OF MATERIALS SCIENCE
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2018
·Vol. 53
·期 22
·15487-15499
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IF 2.993
Yang Ming,Rao Richuan
In this work, nonmetallic S was doped into hierarchical Ni(OH) 2 hollow microspheres by ethanol solvothermal method using thiourea as sulfur source. Although the morphology of precursor Ni(OH) 2 is maintained, the surface states and pore properties had greatly changed after S doping. Using the as-prepared S-doped Ni(OH) 2 as adsorbents for the removal of Congo red (CR), the S-doped Ni(OH) 2 exhibited much better adsorption capacity compared with undoped Ni(OH) 2 . The adsorption behavior of both Ni(OH) 2 and S-doped Ni(OH) 2 followed the pseudo-second-order kinetic model and intraparticle diffusion model. The equilibrium data of Ni(OH) 2 could be better fitted by Langmuir model, while Freundlich model could be better used to describe the S-doped Ni(OH) 2 with a much larger adsorption capacity toward CR. The tuned microstructure and changed surface states of adsorbent after S doping may be responsible for the enhanced adsorption performance. Therefore, the doping of S species into hierarchical Ni(OH) 2 paves a new way to tune the microstructure and surface states of Ni-based materials.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Bei Xue,Kezhi Li,Yao Guo,Jinhua Lu,Shengyue Gu,Leilei Zhang
Direct assembling 2D zeolitic imidazolate frameworks-derived (ZIFs)-derived Ni-Co oxide on Ni foam (Ni x Co 3−x O 4 /Ni foam) is a very attractive way to obtain high performance for electrochemical energy storage device. In this work, the highly optimized Ni x Co 3−x O 4 /Ni foam was prepared via facile co-precipitation, ion-exchange method and subsequently composited with rGO , acting as binder-less electrode for high properties hybrid supercapacitors . As electrode materials , the pure Co 3 O 4 /Ni foam shows 94.40 C g −1 (209.78 F g −1 ) at 1 A g −1 , while the highly optimized Ni x Co 3−x O 4 /Ni foam exhibits a high capacity of 870.3 C g −1 (1934F g −1 ) at 1 A g −1 . Compared with Ni x Co 3−x O 4 /Ni foam, the reduced graphene oxides (rGO) modified Ni x Co 3−x O 4 /Ni foam electrodes possess a porous conductive structure, displaying more superior capacity of 1440.99 C g −1 (3202.22F g −1 ) at 1 A g −1 and a higher cycling stability of 76.10% retention value after 1000 cycles. Subsequently, the Ni x Co 3−x O 4 /rGO/Ni foam electrodes were assembled as a hybrid supercapacitor , exhibiting a maximum energy density of 36.31 Wh kg −1 , a maximum power density of 8000 W kg −1 and a good cycling stability of 76.29% retention value after 3000 cycles. The Ni x Co 3−x O 4 /rGO/Ni foam also could light the blue LED device. Thereby, it is proved that Ni x Co 3−x O 4 /rGO/Ni foam is a promising materials for hybrid supercapacitors.
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ENERGY CONVERSION AND MANAGEMENT
·
2017
·
IF 5.589
Wenjia Wang,Lei Yang,Zhaosen Yin,Shengyan Kong,Wei Han,Jinglai Zhang
In this study, human feces were hydrothermal liquefied and converted into biocrude over Ni-Tm/TiO 2 catalyst. The influence of catalysts, reaction temperature, and holding time on the distribution of products and element content of biocrude was assessed. The biocrude yield increased to 53.16% with a reaction temperature of 330 °C, a holding time of 30 min, and adding Ni-Tm/TiO 2 catalyst while the liquefaction conversion peaked at 89.61%. The biocrude had an HHV of 36.64 MJ/kg and was similar to heavy crude oil. The biocrude is rich in fatty acid amides, esters, and oxygen-containing-only heteroatom-ring compounds as well as some nitrogen-containing heteroatom-ring compounds. The main gaseous products were CO 2 , CH 4 , and C 2 H 6 . Hydrothermal liquefaction over Ni-Tm/TiO 2 catalyst could be a potential method to handle human excrement treatment and produce biofuel.
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CRYSTENGCOMM
·
2017
·Vol. 19
·期 44
·6612-6619
·
IF 3.474
Dan Xu,Ying Pan,Liangkui Zhu,Yusran Yusran,Daliang Zhang,Qianrong Fang,Ming Xue,Shilun Qiu
Coordination complexes are ideal sacrificial templates for fabricating their respective derivatives by changing the thermal conditions. In this study, nitrogen-doped hierarchical porous carbons anchored with nickel nanoparticles (Ni NPs) were prepared by using rod-like nickel dimethylglyoximate [Ni(dmg)2] as a sacrificial template under nitrogen flow at different temperatures. The structure, morphology and properties of the products were characterised by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), N2 adsorption–desorption measurements and ultraviolet-visible (UV-vis) spectrophotometry. The optimised Ni@NC-700 sample exhibited an excellent ability to reduce 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) by NaBH4 in an aqueous solution, which shortened the reduction time to 3.0 min with a conversion of nearly 100%. In addition, Ni@NC-700 possessed magnetic properties, which provided efficient separation by an external magnetic field. The present report may provide a potential and favourable method for preparing magnetically reusable Ni NP anchored N-doped porous carbon catalysts derived from a simple coordination complex.
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JOURNAL OF POWER SOURCES
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2017
·
IF 6.395
Bo Xu,He Yang,Lincheng Yuan,Yiqiang Sun,Zhiming Chen,Cuncheng Li
Development of low-cost, highly active bifunctional catalyst for efficient overall water splitting based on earth-abundant metals is still a great challenging task. In this work, we report a NiFe-Se/C composite nanorod as efficient non-precious-metal electrochemical catalyst derived from direct selenylation of a mixed Ni/Fe metal-organic framework. The as-obtained catalyst requires low overpotential to drive 10 mA cm −2 for HER (160 mV) and OER (240 mV) in 1.0 M KOH, respectively, and its catalytic activity is maintained for at least 20 h. Moreover, water electrolysis using this catalyst achieves high water splitting current density of 10 mA cm −2 at cell voltage of 1.68 V.
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LANGMUIR
·
2024
·
IF 3.7
Yuyun Wang,Guoliang Zhang,Duo Yang,Yang Li,Wei Yin,Jingshui Xu
At present, Ni-based coatings are rarely used in the field of voltage control friction because of their poor antifriction, wear resistance, and conductive properties. Therefore, in this paper, Cu-BTC@Ag nanocrystals were used to enhance the nickel coatings, and the effect of voltage on their tribological properties was also investigated. It was found that the grains of coating were refined via the addition of Cu-BTC@Ag nanocrystals, leading to an improvement in the hardness and corrosion resistance of this composite coating. The tribological performance of nickel composite coating could be controlled under different electrical fields. With the comparison of the pure Ni-based coating, the average friction coefficient and wear volume of its composite coating with 5 wt % Cu-BTC@Ag were reduced by 7.0 and 91.8%, respectively, which showed excellent wear resistance without an applied voltage. Under the condition of 20 V, the 5 wt % Cu-BTC@Ag/Ni-based composite coating owned outstanding antifriction performance. Therefore, Cu-BTC@Ag played an intelligent role in regulating the friction of Ni-based coatings under an external voltage. It is due to the accumulation of Cu-BTC@Ag nanocrystals on the surface of the coating under the action of voltage, which played the role of supporting load and effectively reducing wear.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Zhuoran Li,Limin Cao,Jianxin Sui,Lei Wang,Hong Lin,Kaiqiang Wang
The timely detection of freshness changes of aquatic products is crucial. In this study, we have developed a reliable, cost-effective, and user-friendly method for rapidly detecting hypoxanthine using a xanthine oxidase (XOD)/nanozyme enzymatic cascade system. The nanozyme, derived from the Fe 7 /Ni 3 metal–organic framework (Fe 7 Ni 3 MOF), exhibited good peroxidase-mimetic activity and stability. Our proposed XOD/Fe 7 Ni 3 MOF enzymatic cascade system demonstrated a linear response to hypoxanthine in the range of 3–70 μM, with a low detection limit of 1.39 μM. We also analyzed hypoxanthine in actual aquatic products, achieving spiked recoveries ranging from 90.04 % to 107.37 %. The correlation coefficient between our developed colorimetric method and the HPLC method was 0.98. Importantly, our proposed method holds several advantages over alternative techniques, particularly in terms of cost-effectiveness, precision, and speed. Consequently, this methodology shows great promise for the early detection of freshness changes in aquatic samples.
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FUEL
·
2024
·
IF 6.7
Silu Liu,Yue Wang,Jinxiao Gao,Wei Jin,Weiping Xiao,Liantao Xin,Zhenyu Xiao,Guangrui Xu,Chunlong Dai,Huadong Zhang,Zexing Wu,Lei Wang
Nickel-iron based (Ni-Fe) catalysts are widely used in the electrolysis of water due to their high activity and low cost. However, the development of highly active non-precious metal catalysts is still a great challenge. Herein, self-supported nickel–iron phosphide is fabricated through a sulfurization/phosphorization approach (Ni-Fe-P-S-1/Ni-Fe-P-S-2). The prepared catalysts show excellent catalytic performance and stability. The HER performance of Ni-Fe-P-S-1 reaches 500 mA cm −2 with small overpotentials of 289 mV in alkaline freshwater. Meanwhile, the Ni-Fe-P-S-2 requires 312 and 375 mV to reach 500 mA cm −2 in alkaline freshwater and alkaline seawater for OER. Remarkably, at the current density of 500 mA cm −2 , the Ni-Fe-P-S-1||Ni-Fe-P-S-2 electrolyzer requires only 1.85 V in alkaline. Interestingly, sustainable energies can power the electrolyzer effectively. The work provides methods for potentially promising and cost-effective electrocatalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2012
·
IF 3.07
Changliang Huang,Hongye Zhang,Yanfei Zhao,Sha Chen,Zhimin Liu
Diatomite supported Pd–M (M = Cu, Co, Ni) bimetal nanocatalysts with various metal compositions were prepared and characterized by means of X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. It was demonstrated that the metal nanoparticles were uniformly distributed on the support, and their size was centered around 8 nm with a relatively narrow size distribution. The catalysts were used to catalyze hydrogenation of long-chain aliphatic esters, including methyl palmitate, methyl stearate, and methyl laurate. It was indicated that the all diatomite-supported Pd-based bimetal catalysts were active to the selective hydrogenation of long-chain esters to corresponding alcohols at 270 °C, originated from the synergistic effect between the metal particles and the diatomite support. For the selective hydrogenation of methyl palmitate, Pd–Cu/diatomite with metal loading of 1% and Pd/Cu = 3 displayed the highest performance, giving a 1-hexadecanol yield of 82.9% at the substrate conversion of 98.8%.
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ENVIRONMENT INTERNATIONAL
·
2024
·
IF 10.3
Mei-Mei Wang,Peng-Xi Liu,Feng Ye,Li-Juan Liu,Jia-Tai Wen,Bing-Jie Ni,Hong-Wei Luo,Wei-Kang Wang,Juan Xu
The selective removal of targeted pollutants from complex wastewater is challenging. Herein, a novel persulfate (PS)-based advanced oxidation system equipped with a series of two-dimensional (2D) bimetallic oxide nanosheets (NSs) catalysts is developed to selectively degrade bisphenol A (BPA) within mixed pollutants via initiating nonradical-induced polymerization. Results indicate that the Ni 0.60 Co 0.40 O x NSs demonstrate the highest catalytic efficiency among all Ni-Co NSs catalysts. Specifically, BPA degradation rate is 47.34, 27.26, and 9.72 times higher than that of 4-chlorophenol, phenol, and 2,4-dichlorophenol in the mixed solution, respectively. The lower oxidative potential of BPA in relation to the other pollutants renders it the primary target for oxidation within the PDS activation system. PDS molecules combine on the surface of Ni 0.60 Co 0.40 O x NSs to form the surface-activated complex, triggering the generation of BPA monomer radicals through H-abstraction or electron transfer. These radicals subsequently polymerize on the surface of the catalyst through coupling reactions. Importantly, this polymerization process can occur under typical aquatic environmental conditions and demonstrates resistance to background matrices like Cl − and humic acid due to its inherent nonradical attributes. This study offers valuable insights into the targeted conversion of organic pollutants in wastewater into value-added polymers, contributing to carbon recycle and circular economy.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Shiyong Xu,Mei Li,Ziyu Li,Meijuan Ding,Yijun Wang,Zhiliang Jin
NS-CQDs were synthesized by a hydrothermal method using high-sulfur lignite as the carbon source. Modification of Ni-MOF and Co/Zr-MOF using NS-CQDs to explore the performance of composite photocatalysts for hydrogen production . It was found that NS-CQDs significantly enhanced the hydrogen precipitation performance of the composite photocatalysts compared with the MOFs catalysts alone, and the highest hydrogen precipitation rate of the novel composite photocatalyst 5%NS-CQDs/NCZ2 reached 3662.68 μmol g −1 h −1 . It can be inferred from the conduction band and valence band positions of Ni-MOF, Co/Zr-MOF and NS-CQDs that a double S-type heterojunction is formed. The presence of thiophene and pyrrole nitrogen in NS-CQDs can promote electron transport , reduce the rate of electron-hole pair complexation, and improve the hydrogen evolution activity of the 5%NS-CQDs/NCZ2.
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DALTON TRANSACTIONS
·
2024
·
IF 3.5
Cengceng Du,Zhenyu Wang,Yiming Wang,Wenjuan Xu,Yuqiu Huo,Hongbin Sun,Guangwen Xu
Constructing an environmentally friendly and efficient electrocatalyst holds important and profound significance for energy-efficient hydrogen production. Replacing the oxygen evolution reaction with a lower potential urea oxidation reaction (UOR) may save energy in water electrolysis to produce hydrogen. The UOR is characterized by its high energy barrier, which results in slow reaction kinetics. In this study, we introduced Ba(OH)2 into Ni(OH)2 to form uniform nanosheets. Due to the introduction of Ba2+, the lattice expansion of Ni(OH)2 was triggered, leading to significant improvement in UOR activity. The catalyst achieved a current density of 100 mA cm−2 at only 1.316 V and exhibited remarkable stability over time. Density functional theory (DFT) calculations demonstrate that the Ba–Ni(OH)2 site significantly reduces the energy barrier for urea adsorption, intermediate steps, and desorption. This work provides a novel and environmentally friendly strategy for constructing energy-efficient and highly efficient catalysts through the doping of alkaline earth metals.
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危险品化学品经营许可证（带存储）