Nano Research
·
2018
·Vol. 11
·期 9
·4587-4598
·
IF 7.994
Zhang Jingtong,Chen Yalan,Liu Ming,Du Kun,Zhou Yan,Li Yanpeng,Wang Zhaojie,Zhang Jun
Few-layered MoSe 2 nanosheets with mixed 1T/2H phase were successfully arrayed on a Ti substrate (forming 1T@2H-MoSe 2 /Ti) through a facile one-step solvothermal process. After testing different synthesis conditions, it was found that the optimal process involves a temperature of 200 °C and a reaction time of 12 h. Structural characterizations reveal that the morphology of 1T@2H-MoSe 2 consists of edge-terminated nanosheets with one to five layers, composed of a mixed 1T/2H phase dominated by the 1T one. The 1T@2H-MoSe 2 /Ti electrode shows excellent HER catalytic activity, with a small onset potential (−120 mV vs. reversible hydrogen electrode, RHE) and an electrode potential of only −133 mV (vs. RHE) to achieve a current density of 20 mA·cm −2 . This excellent electrocatalytic activity is due to the synergistic effects of 1T metallic phase, few-layered nanosheet morphology, and direct growth of 1T@2H-MoSe 2 on the Ti substrate. In addition, the 1T@2H-MoSe 2 /Ti electrode shows excellent stability towards long-term electrolysis. This is due to the long-term stability of the valence states of Mo and Se, as shown by post-electrolysis X-ray photoelectron spectroscopy analysis.
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高影响因子
Nanoscale
·
2015
·Vol. 7
·期 33
·13918-13923
·
IF 7.394
Wenlong Gao,Mei Liu,Limei Liu,Hui Zhang,Bin Dong,Christopher Y. Li
Although artificial micromotors have undergone tremendous progress in recent years, their fabrication normally requires complex steps or expensive equipment. In this paper, we report a facile one-step method based on an emulsion solvent evaporation process to fabricate multifunctional micromotors. By simultaneously incorporating various components into an oil-in-water droplet, upon emulsification and solidification, a sphere-shaped, asymmetric, and multifunctional micromotor is formed. Some of the attractive functions of this model micromotor include autonomous movement in high ionic strength solution, remote control, enzymatic disassembly and sustained release. This one-step, versatile fabrication method can be easily scaled up and therefore may have great potential in mass production of multifunctional micromotors for a wide range of practical applications.
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PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2015
·
IF 6.217
De-Jun Chen,Qian-Li Zhang,Jin-Xia Feng,Ke-Jian Ju,Ai-Jun Wang,Jie Wei,Jiu-Ju Feng
In this work, a simple, rapid and facile one-pot wet-chemical co-reduction method is developed for synthesis of bimetallic Au–Pt alloyed nanochains supported on reduced graphene oxide (Au–Pt NCs/RGO), in which caffeine is acted as a capping agent and a structure-directing agent, while no any seed, template, surfactant or polymer involved. The as-prepared nanocomposites display enlarged electrochemical active surface area, significantly enhanced catalytic activity and better stability for methanol and ethylene glycol oxidation , compared with commercial Pt–C (Pt 50 wt%), PtRu–C (Pt 30 wt% and Ru 15 wt%) and Pt black.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2014
·
IF 2.93
Jing-Jing Lv,Shan-Shan Li,Jie-Ning Zheng,Ai-Jun Wang,Jian-Rong Chen,Jiu-Ju Feng
In this work, a simple and facile method is developed in the synthesis of well-dispersed PtAg nanoflowers on reduced graphene oxide nanosheets (PtAg/RGOs) under solvothermal conditions, using ethylene glycol as a reducing agent and hexadecyl trimethyl ammonium bromide (CTAB) as capping and stabilizing agents. The as-prepared nanocomposites show a superior electrocatalytic activity , good tolerance, and better stability toward the oxidation of formic acid and ethylene glycol in alkaline media , compared with the commercial Pt/C (10 wt%) catalyst. For the oxidation of formic acid , the PtAg nanoflowers own thirty times higher of the catalytic currents than those of the commercial Pt/C catalyst. Meanwhile, for the oxidation of ethylene glycol, the ratio of forward current ( j F ) to reverse current ( j R ) is high up to 8.4, which is almost four times higher than that of the commercial Pt/C catalyst. This strategy provides a promising platform for direct formic acid and ethylene glycol fuel cells.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2014
·
IF 2.235
Lei Hu,Xing Tang,Jiaxing Xu,Zhen Wu,Lu Lin,Shijie Liu
A simple and efficient process was presented for the selective hydrogenation of 5-hydroxymethylfurfural (HMF) into the high-quality liquid fuel 2,5-dimethylfuran (DMF) in the presence of tetrahydrofuran (THF). Among the employed metal catalysts, the relatively inexpensive carbon-supported ruthenium (Ru/C) displayed the highest catalytic performance, which led to 94.7% DMF yield with 100% HMF conversion at a relatively mild reaction temperature of 200 °C for only 2 h. Although Ru/C had a little loss in the catalytic activity when it was used for five successive reaction runs, the partially deactivated Ru/C could be easily regenerated by heating at a mixed flow of H2 and N2. Moreover, the plausible mechanism involving an aldehyde group, a hydroxyl group, and a furan ring for the selective hydrogenation of HMF into DMF was also proposed. Subsequently, DMF was separated from the crude hydrogenation mixture according to their various boiling points by the combination of atmospheric distillation and vacuum distillation, and then, the chemical structures and physical properties of the separated DMF were confirmed to be consistent with the authentic DMF. More gratifyingly, Ru/C and THF were also found to be a good combination for the direct hydrogenation of carbohydrate-derived HMF into DMF, which is very important for the practical production of DMF from a variety of biomass-derived carbohydrates such as fructose, glucose, sucrose, maltose, cellobiose, starch, and cellulose.
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高影响因子
CHINESE CHEMICAL LETTERS
·
2014
·
IF 1.178
Yuan-Yuan Yao,Long Zhang,Zi-Fei Wang,Jing-Kun Xu,Yang-Ping Wen
A simple and sensitive platinum nanoparticles/poly(hydroxymethylated-3,4-ethylenedioxylthiophene) nanocomposite (PtNPs/PEDOT-MeOH) modified glassy carbon electrode (GCE) was successfully developed for the electrochemical determination of quercetin. Scanning electron microscopy and energy dispersive X-ray spectroscopy results indicated that the PtNPs were inserted into the PEDOT-MeOH layer. Compared with the bare GCE and poly(3,4-ethylenedioxythiophene) (PEDOT) electrodes, the PtNPs/PEDOT-MeOH/GCE modified electrode exhibited a higher electrocatalytic ability toward the oxidation of quercetin due to the synergic effects of the electrocatalytic activity and strong adsorption ability of PtNPs together with the good water solubility and high conductivity of PEDOT-MeOH. The electrochemical sensor can be applied to the quantification of quercetin with a linear range covering 0.04–91 μmol L −1 and a low detection limit of 5.2 nmol L −1 . Furthermore, the modified electrode also exhibited good reproducibility and long-term stability, as well as high selectivity.
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高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 12
·4384-4390
·
IF 0
Jing-Jing Lv,Jie-Ning Zheng,Shan-Shan Li,Li-Li Chen,Ai-Jun Wang,Jiu-Ju Feng
In this report, well-dispersed porous Pt–Pd nanodendrites (Pt–Pd NDs) were synthesized at high yield by a simple, one-pot, wet chemical method without using any seed, template, or toxic organic solvent. Poly(vinylpyrrolidone) (PVP) and urea were employed as the co-stabilizing and co-structure-directing agents. It was found that the reaction temperature, the amount of PVP and urea, the Pt/Pd molar ratio, and the pH value of the reaction media greatly affected the size and shape of the Pt–Pd product. The as-prepared Pt–Pd nanocrystals had a larger active surface area, superior catalytic activity, and better stability for the electrooxidation of methanol and ethylene glycol (EG), compared with the commercial Pt-black and Pd-black catalysts.
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JOURNAL OF POWER SOURCES
·
2013
·
IF 4.675
Shan-Shan Li,Jianyan Yu,Yuan-Yuan Hu,Ai-Jun Wang,Jian-Rong Chen,Jiu-Ju Feng
Shape-controlled synthesis of bimetallic catalysts attracts increasing attention, because their catalytic performance is closely correlated with the size, shape and crystal structure. In this report, a rapid and simple route is developed for large-scale synthesis of Pt–Pd hollow nanospheres (Pt–Pd HNSs) supported on reduced graphene oxide nanosheets (RGOs) under mild conditions, while no surfactant , seed, or template is involved. The as-prepared nanocomposites display the improved electrocatalytic activity and better stability for methanol oxidation in alkaline media , compared with commercial Pt black and Pd black catalysts. This work may open a new route for construction of Pt-based bimetallic catalysts in fuel cells.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 106
·87061-87068
·
IF 3.84
Pei Song,Shan-Shan Li,Li-Li He,Jiu-Ju Feng,Liang Wu,Shu-Xian Zhong,Ai-Jun Wang
In this work, bimetallic Au–Pt alloyed nanowire networks (AuPt NNs) were facilely synthesized by a simple and rapid one-pot wet-chemical method on a large-scale, using N-methylimidazole as a structure-directing agent and a weak stabilizing agent. The surface of AuPt NNs was clean owing to the easy removal of the adsorbed N-methylimidazole. The control experiments demonstrated that the morphologies of AuPt NNs were strongly correlated with the amount of N-methylimidazole and reaction temperature. The formation mechanism included the four-stage growth processes: rapid nucleation, selective adsorption, π–π induced assembly, and oriented attachment growth. The as-synthesized AuPt NNs exhibited enhanced electrocatalytic activity and improved stability for methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR) as compared to commercial Pt black and individual Pt nanoparticles.
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高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 10
·5352-5359
·
IF 7.443
Li-Li He,Pei Song,Ai-Jun Wang,Jie-Ning Zheng,Li-Ping Mei,Jiu-Ju Feng
In this work, a general strategy was developed for the facile synthesis of bimetallic AuM (M = Pt or Pd) alloyed flowerlike-assembly nanochains (FANs) with the assistance of diprophylline as a structure-directing and stabilizing agent. The morphologies, crystal structures, and compositions of AuPt and AuPd FANs were investigated primarily by transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The formation mechanism was discussed in some detail by varying the concentration of diprophylline. The as-prepared AuM FANs displayed improved catalytic activities and better stabilities for oxygen reduction reaction (ORR) compared to commercial E-TEK Pt/C, Pt black and Pd black.
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高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 10
·5321-5327
·
IF 7.443
Pei Song,Li-Li He,Ai-Jun Wang,Li-Ping Mei,Shu-Xian Zhong,Jian-Rong Chen,Jiu-Ju Feng
A simple and facile one-pot wet-chemical co-reduction method was developed for the synthesis of reduced graphene oxide supported porous PtAu alloyed nanoflowers (PtAu-nanoflowers/rGO). p-Aminopyridine was employed as a structure-directing agent and a stabilizing agent. No seed, template, surfactant, or polymer was involved in the synthesis process. It was found that the reaction temperature and the dosage of p-aminopyridine were essential for the final product. Furthermore, the as-prepared nanocomposites showed improved catalytic activity for the reduction of 4-nitrophenol in contrast to monometallic Pt nanocrystals/rGO, Au nanocrystals/rGO, and commercial Pt/C (50 wt%).
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高影响因子
JOURNAL OF POWER SOURCES
·
2014
·
IF 5.211
Shan-Shan Li,Jie-Ning Zheng,Ai-Jun Wang,Fang-Lei Tao,Jiu-Ju Feng,Jian-Rong Chen,Haiying Yu
In this work, a facile one-pot wet-chemical approach is developed for synthesis of three-dimensional platinum-on-palladium (Pt-on-Pd) bimetallic nanodendrites supported on reduced graphene oxide (rGO), where octylphenoxypolye thoxyethanol (NP-40) acts as a growth-directing agent and formic acid serves as a reducing agent under mild conditions. The nanocomposites exhibit enhanced oxygen reduction reaction activity (onset potential of 0.05 V, half-wave potential of −0.15 V, electron transfer number >3.99) and better stability in alkaline media . The diffusion-limited current densities of Pt-on-Pd/rGO at −0.60 V (3.99 mA cm −2 and 22.72 mA mg −1 ) are much higher than those of PtPd/rGO, Pt/rGO, Pd/rGO, PtPd nanoparticles/rGO, Pt black, Pd black, Pt/C, and Pd/C catalysts. This method is general, facile, and green for preparation of rGO-supporting bimetallic electrocatalysts .
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高影响因子
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