JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Nihad Ibrahim Mohammed Abdallah,Yan Li,Xiao-Tian Wang,Xue Li,Cheng-Wei Wang
Configuring new nanostructured photocatalyst with high efficient photocatalystic capabilities is meaningfully for environmental pollution control. Herein, a p-n heterojunction nanostructured photocatalyst of Ni(OH) 2 /BiVO 4 was well designed and successfully fabricated via a facile solvothermal method, in which Ni(OH) 2 is a wide band-gap semiconductor. Being applied for photo-degradation of anion organic dye, it is found such Ni(OH) 2 /BiVO 4 heterostructures can not only increase the specific surface area and enhance the light response, but also effectively facilitate the photo-generated charge separation and transfer. As a result, 0.5-Ni(OH) 2 /BiVO 4 can possess a photocatalytic capability of 96% and a reaction rate constant 1.9572 h −1 within 90 min irradiation, being 6 and 18 times higher than that of pure BiVO 4 (16%, 0.1098 h −1 ). This study presents a new means to design a kind of high efficient wide band-gap semiconductor constructed BiVO 4 -based photocatalysts.
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INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 44
·期 6
·4827-4836
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IF 3.741
Mojie Sun,Zhao Wang,Bixue Gao,Shijie Wang,Chi Wang,Xiaochen Song,Dongyao Lin
Summary To circumvent the expensive cost of precious metal electrocatalysts, a hydrothermal method and a plasma-enhanced chemical vapor deposition (PECVD) method have been used to prepareNiS 2 -Ni(OH) 2 /NF-PECVD (N-PECVD) with excellent properties. After XRD, SEM, XPS, and other characterization methods, it can be seen that after the hydrothermal reaction of Ni foam (NF), 50-60 nm Ni(OH) 2 nanosheets have grown on the NF frame. The subsequent PECVD reaction produces 90 nm NiS 2 -Ni(OH) 2 nanosheets on the NF frame. The hydrogen release overpotentials in the acidic solution and alkaline solution are 90 and 95 mV ( j = 10 mA/cm 2 ), respectively. And the Tafel slopes reach 80 and 83.6 mV/dec, respectively. The chronopotential (CP) test shows that the material has good HER stability over 12 h. The results from the subsequent electric double layer capacitance and alternating current impedance (EIS) tests show that N-PECVD synthesized by PECVD has a relatively large active electrochemical surface area (ECSA) and a low electrochemical impedance. This study not only finds good inspiration for the synthesis of cheap HER catalysts but also provides a valuable reference for the synthesis of materials in other fields.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2020
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IF 6.551
Zhijie Guan,Yanping Guo,Shoupeng Li,Shaoqing Feng,Yanghong Deng,Xuelian Ou,Jie Ren,Shuiyu Sun,Jialin Liang
Following the conventional physicochemical treatment of electroless nickel (Ni) plating wastewater (ENPW) in electroplating wastewater treatment plants , highly stable and recalcitrant coordination complexes of Ni (CCN) still remain. This results in various technical problems, leading to the treatment difficulty, poor wastewater biochemistry, and failure to meet effluent standards. Therefore, an efficient decomplexation system involving heterogeneous catalytic ozonation assisted with heavy metal chelation (O 3 /SAO3II-MDCR) was proposed in this study for the advanced treatment of CCN. The catalyst SAO3II was characterized by various methods, which revealed the mechanism of catalytic ozonation . Hydroxyl radicals ( OH) and other reactive oxygen species (ROS) groups were detected, proving that catalytic ozonation was a complicated reaction process and also a foundation process of the entire system. These ROS are vital for decomplexation via heterogeneous catalytic ozonation of the system. During the catalytic decomplexation process via ozonation, CCN first underwent gradual decomposition from a highly stable macromolecular state to a volatile micromolecular state (or even completely mineralized state). Then Ni was chelated to form an insoluble and stable chelate via competitive coordination. The optimum conditions for the O 3 /SAO3II-MDCR system were determined by single factor static experiments. After treatment with the O 3 /SAO3II-MDCR system, the effluent concentration of total Ni was found to be <0.1 mg L −1 , exhibiting a removal rate of up to 95.6% and achieving effective removal of total Ni from ENPW and stably meeting the discharge standard. O 3 /SAO3II-MDCR system can easily and hopefully be extended to practical engineering applications.
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Catalysis Science & Technology
·
2020
·Vol. 10
·期 17
·6065-6075
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IF 5.721
Jundong Xu,Chenglong Wen,Shuisen He,Yu Fan
This article presents novel decyltrimethylammonium bromide-dispersed Ni–Mo sulfide (DTMA-NiMo) as a precursor for preparing an efficient NiMoS/γ-Al2O3 hydrodesulfurization (HDS) catalyst. The as-synthesized DTMA-NiMo is a sulfide containing both long-chain quaternary ammonium and Ni–Mo–S elements. The proposed method not only significantly improves the dispersion of Mo species but also greatly promotes the incorporation of Ni into MoS2 slabs, leading to an increase in the number of NiMoS phases. As a result, the DTMA-NiMo-based NiMoS/γ-Al2O3 catalyst exhibits much higher activity for the HDS of 4,6-dimethyldibenzothiophene (4,6-DMDBT) and fluid catalytic cracking (FCC) diesel than NiMoS/γ-Al2O3 catalysts prepared by the co-impregnation and tetrapropylammonium bromide (TPAB)-assisted methods. This novel strategy sheds a light on the facile and low-cost preparation of superior NiMoS phases without sulfidation treatment.
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PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
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2020
·Vol. 217
·期 15
·2000135
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IF 1.759
Jingxue Zhang,Hongtao Cui
The pore-structural ordering in nanosheets-interlinked clusters is a significant issue for the electrochemical performance of Ni(OH) 2 as an electrode material for application in Faraday supercapacitors. Herein, the W/O emulsion stabilized by high shear mixer (HSM) is used as a medium to organize the pore structure in Ni(OH) 2 nanosheets-interlinked spheres. It is found that the water content in emulsion strongly affects the pore structure and surface area of Ni(OH) 2 nanosheets-interlinked spheres formed through the granulation effect of HSM. It is considered that the oil phase as continuous phase in emulsion can reduce the aggregation/agglomeration of Ni(OH) 2 nanosheets, resulting from the strong intermolecular force between nanosheets. As a result, the oil phase in emulsion is beneficial to the formation of ordered pore structure and the increase of surface area in the produced spheres. The characterization results indicate that the sample prepared at a water content of 20 vol% has the largest specific surface area and the well-defined pore structure enclosed with interlinked nanosheets. As a result, this sample presents excellent electrochemical performance and promoted cycling stability.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Yafeng Jin,Guangri Xu,Xiaobo Li,Jingjing Ma,Li Yang,Yuanchao Li,Huan Zhang,Zhen Zhang,Donghao Yao,Donghao Li
To circumvent the binder’s adverse effect on the performance of electrochemical sensor and improve the analysis efficiency, a binder-free cobalt-doped Ni-MOF (Co/Ni-MOF) film, with honeycomb-like structure, is fast electrodeposited on glassy carbon electrode (GCE) by cathodic reduction. No conductive agent added, the Co/Ni-MOF/GCE can be directly used as a sensor for levofloxacin (LEV) determination. Under the optimal condition, a wider linear range of 0.1 μM–500 μM LEV is obtained with the limit of detection (LOD, 3S/N) being 22 nM and the sensitivity of 2.85 μA μM −1 cm −2 . Further, when being used to analysis of LEV in eye drop and spiked milk, satisfactory recoveries of 94.0%–108.2% are achieved. Particularly, benefiting of the synergistic effect of Co 2+ and Ni 2+ , as well as and the binder-free film, the sensor exhibits an excellent sensitivity and a robust long-term stability. This work develops a facile and efficient strategy to synthesis of Co and Ni based MOF film, and provides them a new way in electrochemistry application.
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CATALYSIS LETTERS
·
2020
·Vol. 151
·期 2
·538-547
·
IF 2.482
Chen Han,Xu Qiong,Li Hui,Liu Jian,Liu Xianxiang,Huang Geng,Yin Dulin
Nickel supported on equilibrium fluid-catalytic-cracking catalysts (Ni/E-cats) were prepared by a simple grinding-pyrolysis method and employed for the transfer hydrogenation of ethyl levulinate (EL) to γ-valerolactone (GVL). 96.2% selectivity of GVL and 90.3% conversion of EL were obtained at 180 °C for 6 h over 30-Ni/E-cat. Through XRD, N 2 adsorption–desorption, NH 3 -TPD and SEM analysis, the high activity of the 30-Ni/E-cat catalyst was attributed to its dispersed Ni metal active centers and available acidic sites. Catalytic probe test revealed that metal and acid sites of Ni/E-cat played a synergistic catalytic role in the synthesis of GVL in 2-propanol, where Ni metal sites contribute to the hydrogenation of ketone group in EL, and acid sites of E-cat promoted the lactonization of intermediate ethyl- or isopropyl 4-hydroxyvalerate. Two reaction pathways and synergistic mechanism were proposed in this catalytic system. Moreover, Ni/E-cat catalyst exhibited good stability up to four cycles without obvious loss of catalytic activity. Graphic Abstract
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
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IF 3.573
Ying-Bo Zhu,Jia Guo,Yu-Long Ma,Yuan-Yuan Li
The production of high-value-added chemicals from the degradation of real lignin still has been an unresolved issue. In this study, a two-step strategy was proposed to obtain n-hexanol from alkali lignin, and high conversion of alkali lignin and selectivity of n-hexanol were achieved. The deoxygenation performance of the synthesized Ni-HZSM-5 catalyst, modified by Ca, was efficiently improved. At first, through the deoxygenation of alkali lignin via Ni/CaO-HZSM-5, the C–O bonds of the material were broken effectively and 44% degree of deoxygenation (DOD) was obtained. Second, n-hexanol was selectively produced over the Ni/HZSM-5 catalyst from the liquid product obtained by the first step. The efficiency of deoxygenation (DOD) was attained at 71%, and the heat value increased to 51.6 MJ/kg from 19.9 MJ/kg after the two-step strategy. This strategy showed a high catalytic effect to produce n-hexanol from alkali lignin using Ni/CaO-HZSM-5 and Ni/HZSM-5 catalysts and revealed a superior advantage in the hydrodeoxygenation of real lignin to form high additional value chemicals.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
·
IF 4.939
Xingqiang Wu,Husileng Lee,Hongzhen Liu,Liangjie Lu,Xiujuan Wu,Licheng Sun
Electrochemical water splitting for hydrogen production is a promising solution for the production of renewable and environmentally friendly energy sources, but it is hindered by the sluggish kinetic process of oxygen evolution reaction (OER). Here, a novel hierarchical core-shell nanoarray NiCo/Ni/CuO/CF was synthesized by assembling Ni–Co hydroxide nanosheets directly on the metallic nickel coated CuO nanowires , as a highly efficient electrocatalyst for alkaline OER. This NiCo/Ni/CuO/CF anode exhibited low overpotentials of 246 mV and 286 mV at current densities of 10 mA cm −2 and 100 mA cm −2 , respectively, and a small Tafel slope of 37.9 mV dec −1 . Moreover, NiCo/Ni/CuO/CF showed robust durability at least 60 h at a current density of 100 mA cm −2 . Detailed investigations verified that the unique nanosheets/nanowires architecture with high conductivity metallic nickel layer can expand the exposure of active sites and accelerate the transport of electrons.
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Journal of CO2 Utilization
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2019
·
IF 5.189
Qingxiang Ma,Yunxing Han,Qinhong Wei,Shengene Makpal,Xinhua Gao,Jianli Zhang,Tian-sheng Zhao
The bimodal mesoporous-macroporous alumina support was prepared via evaporation-induced self-assembly method (EISA), in which the polystyrene latex spheres with 100 nm diameter size were employed as sacrificial templates to fabricate macropores. The mesoporous-macroporous Al 2 O 3 -supported Ni catalyst (Ni/MM-A) was prepared by incipient-wetness impregnation method and applied for dry reforming of methane (DRM) to syngas. Characterizations by XRD, H 2 -TPR, SEM, and TEM revealed that the long-range ordered mesopore structure together with existing macropores was fabricated by using the EISA method, and the Ni particles were mainly stabilized inside the mesoporous channels of Al 2 O 3 support and the strong interaction between Ni and Al 2 O 3 was constructed. The Ni/MM-A catalyst exhibited more excellent catalytic performance in DRM reaction than that over Ni/M-A without macroporous structure. Stability tests for 100 h DRM reaction further indicated that the Ni/MM-A catalyst presented strong catalytic stability, which was significantly attributed to the macroporous structure that allowed the rapid mass transport, enhanced the tolerance to graphitic carbon and reduced the amount of graphitic carbon depositions.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Hongcai Su,Ekkachai Kanchanatip,Defeng Wang,Haidan Zhang,Antoni,Ishrat Mubeen,Zhicheng Huang,Mi Yan
Ni/Al 2 O 3 catalyst is the one of promising catalysts for enhancing H 2 production from supercritical water gasification (SCWG) of biomass. However, due to carbon deposition , the deactivation of Ni/Al 2 O 3 catalyst is still a serious issue. In this work, the effects of lanthanum (La) as promoter on the properties and catalytic performance of Ni/Al 2 O 3 in SCWG of food waste were investigated. La promoted Ni/Al 2 O 3 catalysts with different La loading content (3–15 wt%) were prepared via impregnation method. The catalysts were characterized using XRD , SEM, BET techniques. The SCWG experiments were carried out in a Hastelloy batch reactor in the operating temperature range of 420–480 °C, and evaluated based on H 2 production. The stability of the catalysts was assessed by the amount of carbon deposition on catalyst surface and their catalytic activity after reuse cycles. The results showed that 9 wt% La promoter is the optimal loading as Ni/9La–Al 2 O 3 catalyst performed best performance with the highest H 2 yield of 8.03 mol/kg, and H 2 mole fraction of 42.46% at 480 °C. La promoted Ni/Al 2 O 3 catalysts have better anti-carbon deposition properties than bare Ni/Al 2 O 3 catalyst, resulting in better gasification efficiency after reuse cycles. Ni/9La–Al 2 O 3 catalyst showed high catalytic activity in SCWG of food waste and had good stability as it was still active for enhancing H 2 production when used in SCWG for the third time, which indicated that La promoted Ni/Al 2 O 3 catalysts are potential additive to improve the SCWG of food waste.
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Nanomaterials
·
2019
·Vol. 9
·期 12
·1688
·
IF 4.034
Xiaoyu Hu,Peilong Li,Xin Zhang,Bin Yu,Chao Lv,Ning Zeng,Junhong Luo,Zhi Zhang,Jiangfeng Song,Yong Liu
A high-efficient and low-cost catalyst on hydrogen isotope separation between hydrogen and water is an essential factor in industrial application for heavy water production and water detritiation. In past studies, Pt-based catalysts were developed but not practical for commercial use due to their high cost for vapor phase catalytic exchange (VPCE), while for impregnated nickel catalysts with a lower cost the problems of agglomeration and low Ni utilization existed. Therefore, to solve these problems, in-situ grown Ni-based catalysts (NiAl-LDO) derived from a layered double hydroxide (LDH) precursor were fabricated and first applied in VPCE in this work. Compared with traditional impregnated Ni-based catalysts, NiAl-LDO catalysts own a unique layered structure, homogeneous dispersed metallic phase, higher specific surface area as well as stronger metal-support interactions to prevent active metal from agglomerating. These advantages are beneficial for exposing more active sites to improve dynamic contacts between H2and HDO in a catalyst surface and can bring excellent catalytic activity under a reaction temperature of lower than 400 °C. Additionally, we found that the dissociative chemisorption of HDO and H2occurs not only in Ni (111) but also in NiO species where chemisorbed H(ads), D(ads), OH(ads) and OD(ads) are formed. The results highlight that both of the Ni2+species and Ni0species possess catalytic activities for VPCE process.Keywords:vapor phase catalytic exchange;layered double oxides;Ni catalyst;water detritiation
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