CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Zimo Lou,Jiasheng Zhou,Mei Sun,Jiang Xu,Kunlun Yang,Dan Lv,Yaping Zhao,Xinhua Xu
A Pd/MnO 2 /Ni foam electrode with hierarchical structure was synthesized via electrodeposition for efficient electrocatalytic hydrodechlorination. Compared with the ordinary Pd/Ni foam electrode, the introduction of MnO 2 greatly enhanced the catalytic reactivity and reduced the dose of precious metal Pd. Only a quarter of Pd was required for the Pd/MnO 2 /Ni foam compared to the Pd/Ni electrode to achieve complete dechlorination of 2,4-dichlorobenzoic acid (2,4-DCBA) within 120 min. Various characterizations suggested that MnO 2 covered the surface of the Ni foam and increased the specific surface area of the electrode, while Pd nanoparticles were subsequently deposited on MnO 2 . The atomic H ∗ -based indirect dechlorination was the dominant pathway while only approximately 13% of 2,4-DCBA was removed by direct electron transfer. Atomic H ∗ adsorbed on Pd acted as the key active species for the dechlorination of 2,4-DCBA by the Pd/MnO 2 /Ni foam electrode in this study. The introduction of MnO 2 would promote the water dissociation and the hydrogen evolution reaction, and provide Pd with more atomic H ∗ . Pd/MnO 2 /Ni foam exhibited good stability and reusability according to the XPS spectra and consecutive electrocatalytic experiments, which suggested its long-term potential for efficient removal of chlorinated contaminants. This work demonstrated a new strategy to design efficient electrocatalysts with less precious metal.
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高影响因子
GREEN CHEMISTRY
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2018
·Vol. 20
·期 15
·3634-3642
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IF 8.586
Bin Zhang,Bin Chen,Mark Douthwaite,Qiang Liu,Chao Zhang,Qifan Wu,Ruhui Shi,Peixuan Wu,Fengyu Zhao,Graham Hutchings
Carbon based materials are some of the most commonly studied catalysts for the conversion of cellulose to polyols. The catalytic performance of these materials, however, is typically limited by the access of the substrate to the active sites, which is governed by the poor solubility of cellulose in aqueous solutions. In an attempt to resolve this, we presented a novel hierarchical carbon material which was synthesized by a dual-templating method. Transmission electron microscopy and porosity measurements confirmed that the resultant materials consisted of both spherical macropores and well-defined mesoporous channels. Additional characterisation of this material revealed that it has an exceptionally high surface area (>1110 m2 g−1) and a high concentration of acidic sites, which are considered to be crucial for the hydrolysis of cellulose. Ni nanoparticles were subsequently immobilised onto this material and some additional carbon supports. It was determined that the high surface area and porosity of the synthesised carbon material assisted with the dispersion of the Ni nanoparticles. This Ni catalyst was found to be highly efficient for the one-pot conversion of cellulose to polyols, which is proposed to be a consequence of both the high number of acid sites and excellent Ni dispersion. This approach to catalyst design, offers a novel method for the valorisation of cellulose.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
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IF 4.229
Changli Zhu,Shisheng Hou,Linxi Hou,Kui Xie
High temperature carbon dioxide electrolyzers are expected to play a key role on carbon-neutral energy cycle. Here we report a novel composite, namely perovskite SrFeO 3−δ with impregnated Ni nanoparticles , as an advanced cathode materials for solid oxide electrolysis cells (SOECs). The XRD , SEM and TEM together indicate that the homogeneously distributed Ni nanoparticles on SrFeO 3−δ substrate create sufficient and active triple-phase boundary (TPB) for electrochemical carbon dioxide splitting. Electrochemical measurements show that this tailored SrFeO 3−δ cathode demonstrates better performance, and then exhibits long-term stability after 100 h operation and 8 redox cycles.
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ACS Applied Materials & Interfaces
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2018
·
IF 8.097
Yan Xing,Jing Cheng,Mengfei Zhang,Meng Zhao,Liyan Ye,Wei Pan
Water-purifying materials are of vital importance for providing sanitary water, especially in epidemic and disaster areas and for wilderness survival. Here, we report a novel inorganic composite with a fast, reusable, and pleiotropic water purification ability. The composite of heterogeneous Ni–La2O3 nanofibers was developed using an easy, low-cost, and large-scale production process, i.e., an electrospinning technique. Because of the unique heterostructure formed by introducing nickel nanoparticles into the La2O3 host, the nanocomposite fibers can rapidly remove various detrimental micropollutants with absorption rate constants hundreds of times greater than those of inorganic materials and activated carbons. In addition, the nanocomposite can be recycled by a soft washing procedure at ambient temperature and demonstrates a much more stable performance than the state-of-the-art activated carbon materials. Furthermore, the nanofibers have an excellent germicidal effect against the high-risk human pathogen Escherichia coli. Our work introduces a promising inorganic absorbent suitable for purifying life-sustaining water supplies in emergency situations and alleviating worldwide water shortages.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Chengbo Wei,Chuan Liu,Linna Gao,Yanfang Sun,Qingyun Liu,Xiao Zhang,Jinxue Guo
Integrating heterogeneous hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) electrocatalysts into compatible composite catalysts with specific interfaces and structures holds great promise for the development of efficient bifunctional catalysts for overall water splitting. Herein, heterogeneous MoS 2 -Ni(OH) 2 catalyst supported by Ni foam (MoS 2 @Ni(OH) 2 /NF) is developed, in which the Ni(OH) 2 nanorod array is grafted with MoS 2 nanosheets . The hierarchical 1D/2D structures benefit not only the exposure of catalytic site but also the facilitated charge transfer. The heterointerfaces allow the synergism of electric structure modulation for improved catalytic activity and kinetics towards HER, OER, and overall water splitting. MoS 2 @Ni(OH) 2 /NF achieves a current density of 10 mA cm −2 at low overpotentials of 134 and 233 mV for HER and OER in 1 M KOH, respectively. Moreover, a cell voltage as low as 1.46 V is obtained to afford 10 mA cm −2 in a tow-electrode electrolyzer using MoS 2 @Ni(OH) 2 /NF as bifunctional catalysts, assuring it superior to most of the reported noble-metal-free bifunctional electrocatalysts. Such heterogeneous design of composite catalyst should shed light on the exploration of functional materials for energy applications.
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SURFACE & COATINGS TECHNOLOGY
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2014
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IF 2.199
Zuxin She,Qing Li,Zhongwei Wang,Cui Tan,Juncen Zhou,Longqin Li
A highly anticorrosion and self-cleaning superhydrophobic surface with hierarchical flowerlike structures fabricated on AZ91D magnesium alloy is reported in this work. The hierarchical micro/nanostructures were created through electrodeposition of Ni–Co alloy coating. Followed by modification of stearic acid, a superhydrophobic surface with a water contact angle as high as 167.3 ± 1.3° and an ultra-low sliding angle of about 1° was achieved. The anticorrosion performance of the superhydrophobic surface was studied by using a combination of potentiodynamic polarization and EIS in neutral 3.5 wt.% NaCl solutions. The superhydrophobic surface can present an excellent anticorrosion effect with the inhibition efficiency of 99.99% to the bare magnesium alloy and its corrosion rate being 0.06% of that of bare magnesium alloy. The resulting superhydrophobic surface showed excellent superhydrophobicity in a wide range of pH values from 1 to 14. Besides, the as-prepared superhydrophobic surface possessed good chemical stability and self-cleaning effect. It's believed that the highly anticorrosion and self-cleaning superhydrophobic surface can efficiently protect magnesium alloy from corrosion and expand its application scope.
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SENSORS AND ACTUATORS B-CHEMICAL
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2014
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IF 3.84
Wangyao Zhang,Yang Yang,Fenfen Li,Guosheng Song,Yong Shao,Ruizhuo Ouyang,Lina Xu,Weiwei Li,Yuqing Miao
A simple one-step method was successfully developed to prepare stable nanosized Ni(OH) 2 @Cr(OH) 3 hybrid particles by just adding NaOH to a mix solution containing Ni(NO 3 ) 2 and Cr(NO 3 ) 3 at room temperature. In contrast, under the exact same conditions, flocculent Ni(OH) 2 or Cr(OH) 3 precipitate was obtained after the addition of equivalent NaOH in a solution containing same amount of Ni(NO 3 ) 2 or Cr(NO 3 ) 3 as in the mix solution. The interaction between Ni(II) and Cr(III) ions was believed to make major contribution to the formation of stable Ni(OH) 2 @Cr(OH) 3 nanohybrid without aggregation to large-size particles. The prepared Ni(OH) 2 @Cr(OH) 3 hybrid nanoparticles were well characterized by the scanning electron microscopy (SEM), the transmission electron microscopy (TEM), X-ray diffraction (XRD), and electrochemical measurements with results showing uniform size, smooth surface, good monodispersibility, fast electron transfer rate as well as promising electrocatalytic properties toward glucose (Glu) and cysteine (Cys) oxidation. The presence of a small amount of Cr(OH) 3 in the composite not only improved the stability and monodispersibility of the Ni(OH) 2 @Cr(OH) 3 hybrid particles, decreased their size to nanoscale, but also exerted positive effect to the electrochemical properties of the obtained Ni(OH) 2 based nanomaterials like the electron transfer rate and the electrocatalytic activity. Satisfactory electrocatalytic performances of the Ni(OH) 2 @Cr(OH) 3 nanohybrid toward Glu and Cys oxidations were achieved, respectively, in certain concentration ranges with acceptable detection limits and correlation coefficients, suggesting the potential facilitation of electrocatalysis toward other small molecules by the newly prepared Ni(OH) 2 @Cr(OH) 3 nanohybrid.
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JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2013
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IF 3.187
Yueling Cao,Junwei Wang,Maoqing Kang,Yulei Zhu
Ni–WO 3 /SBA-15 catalysts were prepared by an impregnation way and applied to the hydrogenolysis of cellulose in aqueous solution. The effect of nickel and WO 3 loading, catalysts reduction temperature and time on cellulose conversion were investigated. Up to 70.7% ethylene glycol yield was obtained over 3%Ni–15%WO 3 /SBA-15 catalysts. Several physicochemical methods such as XRD, Raman spectroscopy, NH 3 -TPD, H 2 -TPR and XPS were used to determine the character of catalysts. Based on these studies, it was found that there was a strong electronic interaction between NiO and WO 3 , which not only promoted the reduction of WO 3 , but restrained the reduction of NiO. Together with the experimental results, it can be concluded that the WO 3− X , which may be the active species for the selective cleavage of C C bond, was formed after catalysts pretreatment process. Additionally, a possible catalytic mechanism was proposed.
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Catalysis Science & Technology
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2017
·Vol. 7
·期 24
·5993-5999
·
IF 5.773
Huiling Zhang,Xuejia Gao,Yuanyuan Ma,Xue Han,Libo Niu,Guoyi Bai
A Ni/mSiO2-AE nanocatalyst was successfully prepared via loading the active nickel species on mSiO2 by an ammonia evaporation (AE) method. It exhibited excellent catalytic performance in the selective hydrogenation of benzoic acid with the conversion of benzoic acid and selectivity to cyclohexane carboxylic acid being 98.9% and 99.1%, respectively. Furthermore, the catalyst can be recycled four times without appreciable loss of its initial activity. As demonstrated by TEM, the active nickel species was highly dispersed with an average particle size of 3.2 nm in this nanocatalyst, which is much smaller than that of Ni/mSiO2-IMP (∼18 nm), prepared by a conventional impregnation method. TPR and XPS results revealed the existence of a stronger interaction between the active nickel species and the mSiO2 support in Ni/mSiO2-AE, compared to Ni/mSiO2-IMP. This strong metal–support interaction in Ni/mSiO2-AE can effectively suppress the loss of the active nickel species during the reaction, resulting in its good stability under relatively harsh reaction conditions.
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CHEMICAL ENGINEERING JOURNAL
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2016
·
IF 5.31
Guan-Yu Pan,Yu-Long Ma,Xiao-Xia Ma,Yong-Gang Sun,Jun-Min Lv,Jian-Li Zhang
Ni–W/MCM-41 as a non-noble metal catalyst for catalytic conversion of corn stalk pretreated with alkali into polyol was prepared by an impregnation method. The results showed that pretreatment corn stalk with alkali removed 41.79 wt% of hemicellulose and 60.21 wt% of lignin and thereby increased the content of cellulose from 41.13 wt% to 59.29 wt%. Data obtained from X-ray photoelectron spectra exhibited that there was an intense interaction between nickel and tungsten. Meanwhile, the Ni 17 W 3 alloy was evidenced by X-ray diffraction spectra. These were very beneficial to enhance the catalytic conversion of lignocellulose into polyol. The maximum yield of 71.37 wt% polyol was obtained by catalytic hydrogenation of lignocellulose to ethylene glycol and 1,2-propylene glycol utilizing 5%Ni–15%W/MCM-41 catalyst under H 2 pressure of 6 MPa and 250 °C for 2 h.
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ChemElectroChem
·
2017
·Vol. 5
·期 3
·507-514
·
IF 4.136
Beirong Ye,Miaoliang Huang,Quanlin Bao,Si Jiang,Jinhua Ge,Huang Zhao,Leqing Fan,Jianming Lin,Jihuai Wu
Graphical Foam support : A NiTe/NiSe composite electrode supported on a Ni foam is synthesized by using a two-step process involving a hydrothermal method and cyclic voltammetry electrodeposition. The NiTe/NiSe composite electrode exhibits excellent electrochemical performance with a specific capacitance of 1868 F g −1 (5.60 F cm −2 ) at 1 A g −1 and remarkable cycling stability. The asymmetric supercapacitor based on a NiTe/NiSe positive electrode has a high specific capacitance of 94.9 F g −1 as well as a maximum energy density of 33.7 Wh kg −1 and power density of 4000 W kg −1 . NiTe/NiSe composites grown in situ on Ni foam are successfully developed as a binder-free electrode for supercapacitors. The as-obtained NiTe/NiSe composite electrode exhibits excellent electrochemical properties with a higher specific capacitance of 1868 F g −1 (5.60 F cm −2 ) at a current density of 1 A g −1 . In addition, an asymmetric supercapacitor is fabricated with NiTe/NiSe as the positive material and active carbon (AC) as the negative material. The resulting NiTe/NiSe//AC device exhibits a high energy density of 33.7 Wh kg −1 at a power density of 800 W kg −1 , providing good cycling performance that retained 86.2 % of the initial capacitance at 2 A g −1 after 5000 cycles. All of the results illustrate that the NiTe/NiSe electrode is promising for potential application in supercapacitors and other fields.
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Nanoscale
·
2017
·Vol. 9
·期 17
·5583-5588
·
IF 7.367
Xueping Zhang,Liang Huang,Yujie Han,Miao Xu,Shaojun Dong
Developing efficient and earth-abundant oxygen evolution reaction (OER) electrocatalysts is of great importance in renewable energy research. Herein, we report nitrogen-doped carbon encapsulating γ-MoC/Ni heterostructures (γ-MoC/Ni@NC) for the first time as efficient OER electrocatalysts. The composites can be controlled by the addition of a Mo source to form a nanoparticle-assembled hierarchically porous nanostructure, which can enlarge the specific surface area, thus exposing more active sites. Moreover, we demonstrate that the formation of γ-MoC@Ni heterostructures and the resulting synergistic effect between γ-MoC and Ni can facilitate the reaction kinetics, leading to significantly improved OER activity with an onset overpotential of merely 240 mV, and a low overpotential of 310 mV to afford a current density of 10 mA cm−2. This work provides a new insight into the development of highly active and inexpensive OER electrocatalysts.
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