APPLIED ENERGY
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2016
·
IF 5.746
Weizi Cai,Qian Zhou,Yongmin Xie,Jiang Liu,Guohui Long,Shuang Cheng,Meilin Liu
Biochar derived from orchid tree leaves is utilised as the fuel of a direct carbon solid oxide fuel cell (DC-SOFC), with yttrium stabilized zirconia (YSZ) as electrolyte and cermet of silver and gadolinium doped ceria (Ag-GDC) as the material of both cathode and anode, operating without any liquid medium or feeding gas. The performance of the DC-SOFC operated on the leaf char is higher than that operated on the best reported carbon fuel for DC-SOFCs, Fe-loaded activated carbon. XRD, Raman spectroscopy, SEM and EDX are applied to characterize the leaf char. It turns out that the leaf char is with porous structure and there is much Ca along with some K and Mg uniformly distributing in the leaf char. The effects of the naturally existing alkaline earth metal and alkaline metal and their distribution on the performance of the DC-SOFCs operated on the leaf char are analyzed in detail.
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高影响因子
Molecular Catalysis
·
2017
·
IF 0
Wanbing Gong,Chun Chen,Haimin Zhang,Yong Zhang,Yunxia Zhang,Guozhong Wang,Huijun Zhao
In this work, N-doped activated carbon supported metallic nickel (Ni/NAC) catalysts were fabricated by two-step calcination method in N 2 atmosphere for liquid-phase hydrogenation of furfural (FAL). It was found that the pyrolysis temperature and amount of melamine as N doping source have important influence on N doping content and type in activated carbon (AC) support, resulting in the subsequently formed Ni nanoparticles on N-doped AC with different sizes and thus affording different catalytic hydrogenation activities. The results demonstrated that using N-doped AC with 1.0 g melamine at 1073 K in N 2 atmosphere as support, the obtained Ni/NAC at 873 K in N 2 atmosphere with Ni nanoparticle sizes of ∼13.1 nm (denoted as Ni/NAC-1-1073) exhibits a N doping content of 3.65 at.% and a surface area of 561.2 m 2 g −1 with a microporous structure. As catalyst for FAL hydrogenation, Ni/NAC-1-1073 demonstrated the best catalytic performance among all investigated catalysts, achieving almost 100% selectivity of tetrahydrofurfuryl alcohol (THFOL) with a complete FAL conversion at 353 K after 3 h reaction, while only 76.7% selectivity of THFOL with a FAL conversion of 86.4% was obtained using Ni/AC catalyst without N doping under the identical experimental conditions. Furthermore, it was found that almost 100% conversion of FAL to furfural alcohol (FOL) can be reached by transfer hydrogenation pathway in 2-proponal solvent using Ni/NAC-1-1073 at 413 K after 5 h reaction, whereas Ni/AC without N doping can only afford 30.2% conversion of FAL to FOL under the same conditions. The superior catalytic performance of Ni/NAC-1-1073 could be ascribed to a synergistic effect of nanosized Ni providing catalytic active sites, suitable N doping content and type in AC to promote catalytic performance, and advantageous structure characteristics of high surface area and porous structure favourable for the exposure of catalytic active sites and mass transport.
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RSC Advances
·
2016
·Vol. 6
·期 110
·109023-109029
·
IF 3.289
Lijuan Lan,Fanglin Du,Chuanhai Xia
Carbon nanotubes (CNTs) supported Pd catalysts (1 wt% and 5 wt%) were prepared by a conventional impregnation method and tested in liquid-phase hydrodechlorination (HDC) of para-chlorophenol (p-CP) under mild conditions (313 K and atmospheric pressure) with H2. CNTs as a catalyst support offered better performance than activated carbon (AC). The conversion of p-CP reached 72% and 82% over 5 wt% Pd/AC and 5 wt% Pd/CNTs, respectively, within 30 min. When the content of Pd was reduced to 1 wt%, the conversion of p-CP over Pd/AC and Pd/CNTs was 55% and 83%, respectively. The mechanism of this phenomenon was studied through catalyst characterization (XRD, TEM, and BET). The abovementioned results indicated that the different activities of the catalysts over different supports mainly resulted from the porous structure of the supports and nanoparticle diameters of the active metal.
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高影响因子
GREEN CHEMISTRY
·
2016
·Vol. 19
·期 3
·682-691
·
IF 8.506
Naixu Li,Yu Zheng,Lingfei Wei,Hongcheng Teng,Jiancheng Zhou
Although the conversion of cellulose to polyols is currently well-developed, the production of the considerably valuable ethylene glycol (EG) is still challenging. Reactions have long relied on the design of suitable catalysts to obtain a high selectivity and yield of EG. Herein, using well-shaped rectangular tungsten trioxide nanosheets as the substrate, we investigated the catalytic performances of various metal supported catalysts for the convertion of cellulose to EG. Results show that Ru/WO3 is more favorable for EG production, with the highest EG yield of 76.3% over the 1% Ru/WO3 nanosheet catalyst. Our characterizations and activity tests suggest that the embedding of Ru nanoparticles onto the WO3 nanosheets produces more W5+ active sites under the same reduction conditions (NaBH4 or H2), which act as Lewis base sites to promote the glucose retro-aldol condensation reaction. Moreover, the Ru/WO3 catalyst holds a portion of Ru in the form of amorphous RuOxδ+ phases, which could further increase the H+ released into an aqueous solution for cellulose hydrogenolysis. A possible catalytic mechanism for this hydrogenolysis process is accordingly proposed.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 106
·103923-103929
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IF 3.289
Jinzuan Wang,Jun Yang,Tao Huang,Wenyan Yin
Self-assembled manganese cobalt oxide (Mn0.5Co2.5O4) nanofibers sandwiched in graphene sheets (Mn0.5Co2.5O4@G) are successfully synthesized by a hydrothermal treatment and annealing process. Owning to the unique sandwich-like structures, rich active sites, and boosted electrical conductivity, Mn0.5Co2.5O4@G composite demonstrates superior electrochemical performance for potential supercapacitors. In a three-electrode system, it exhibits excellent cycling stability with a specific capacitance retention of 93.8% after 10 000 cycles at a current density of 10 A g−1, and achieves specific capacitances of 617 and 434 F g−1 at the ultrahigh current densities of 30 and 40 A g−1, respectively. For an asymmetric supercapacitor of Mn0.5Co2.5O4@G//AC, high energy densities of 36.8 and 13.6 W h kg−1 are also achieved at power densities of 147.3 and 3755.8 W kg−1, respectively. It is believed that the synthesized Mn0.5Co2.5O4@G composite can be a promising electrode material for high-performance supercapacitors, and the present synthetic strategy can be further extended for designing many other functional composites with desirable nanostructures and performance.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2016
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IF 4.758
Xia Xiang,Zhen Zhang,Ling Han,Fenghong Huang,Mingming Zheng,Hu Tang,Qianchun Deng
A new fluorescence switching sensor for sensitive detection of sinapine (SP) was developed based on aggregation and disaggregation of carbon quantum dots (CDs) with the assistance of copper ions (Cu 2+ ). In the detection, carboxyl group on the surface of CDs enables the aggregation triggered by Cu 2+ due to the effective coordination, inducing obvious fluorescence quenching. Upon the addition of SP into the solution, higher affinity between SP and Cu 2+ is found to from SP-Cu coordination complex, leading to re-dispersion and fluorescence recovery of CDs. The fluorescence switching sensor for SP detection has advantages of simplicity, rapidness, high sensitivity and selectivity. The quantitative range for SP detection is from 0.04 to 5 μg mL −1 with the detection limit of 0.02 μg mL −1 . In practical samples, the recoveries of the samples ranged from 87.9% to 117.0%.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 107
·105454-105460
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IF 3.289
Fengqi Zhou,Hui Feng,Yafen Fang,Qian Sun,Zhaosheng Qian
Phenylsulfonic acid functionalized carbon quantum dots (PSA-CQDs) were prepared and used to construct a convenient and reliable fluorometric biosensor for acetylcholinesterase (AChE) activity and inhibitor screening. Effective static quenching process occurred owing to the formation of nonfluorescent complex when copper(II) ions were added to PSA-CQDs, which results in its fluorescence quenching due to strong coordination of copper ions to sulfonic groups of PSA-CQDs. As a result, the fluorometric assay for AChE was established based on the stronger affinity between copper and thiocholine hydrolyzed from acetylthiocholine under the hydrolysis of AChE which can induce fluorescence recovery. Meanwhile, the inhibition effect of tacrine to AChE was assessed because its effective inhibition effect to AChE leads to the prevention of hydrolysis of acetylthiocholine and the following occurrence of PET process which causes the quenching of fluorescence. This detection method is convenient and efficient, which has high sensitivity with detection limit as low as 2.6 U L−1 and a broad linear scope ranging from 3.8 to 80.0 U L−1. This work proposed a competitive assay strategy among the sulfonic acid modified probe, copper cation and thiocholine to quantify AChE activity using functional carbon quantum dots, and can be utilized to design detection methods for other thiol-containing targets of interest.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2016
·
IF 3.782
Rui Zhao,Xiang Li,Bolun Sun,He Ji,Ce Wang
An environmentally benign and efficient hydrothermal carbonization method is widely applied for the preparation of carbon-based adsorbents. However, the adsorption capacity toward anionic species would be influenced due to the negatively charged surface of the traditional hydrothermal carbonaceous materials ; moreover most of the carbonaceous materials were in the form of powder which restricted the practical applications. Herein, amino-rich hydrothermal carbon-coated electrospun polyacrylonitrile fiber (PAN@NC) adsorbents were obtained through one-step hydrothermal carbonization approach assisted by diethylenetriamine using polyacrylonitrile (PAN) fibers as the templates, which showed highly efficient adsorption for anionic pollutants. The PAN@NC fibers were characterized in detail to confirm their structures and composition . The flexible and robust PAN@NC fiber membrane exhibited high adsorption capacity and good regeneration and recycling ability toward the anionic metal ion Cr(VI) and herbicide 2,4-dichlorophenoxyacetic acid (2,4-D). According to the Langmuir model, the adsorption behaviors showed monolayer adsorption capacities of 290.70 mg/g and 164.47 mg/g for Cr(VI) and 2,4- D , respectively, which were higher than that of many other adsorbents. Recycling study indicated that the removal efficiencies for both pollutants retained above 90% after five cycles. These findings demonstrate that PAN@NC fibers are promising adsorbents for the removal of anionic pollutants from wastewater solutions.
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PubMed
高影响因子
Journal of Energy Chemistry
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2016
·
IF 2.322
Panpan Yang,Qineng Xia,Xiaohui Liu,Yanqin Wang
The catalytic conversion of 5-hydroxymethylfurfural (HMF) to 2,5-dimethylfuran (DMF) has attracted extensive research interests because DMF can be used as potential and competitive renewable transportation fuel or additives. Here we report a non-noble bimetallic catalyst with improved activity for hydrogenation and hydrogenolysis by introducing active carbon as support into a nickel–cobalt catalyst. The characterizations of the catalyst indicate that the Ni and Co species are uniformly dispersed on the active carbon through the wetness impregnation method. The influences of reaction temperature and hydrogen pressure are systematically investigated and an excellent yield (up to 95%) of DMF can be obtained at relatively mild conditions, 130 °C and 1 MPa H 2 , over the carbon supported Ni–Co bimetallic catalyst. The high catalytic activity originates from the synergistic effect between Ni and CoO x species, the high BET surface area of the catalyst, and the uniform dispersion of Ni and Co species on the active carbon. The catalyst could be reused for 5 times without loss of activity in a batch reactor . Futhermore, the conversion of HMF to DMF on a fixed-bed reactor was also investigated and the 2%Ni–20%Co/C catalyst exhibited an excellent yield to DMF (>90%) for 71 h time on stream, indicating the high activity and stability of the catalyst.
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Nano Energy
·
2024
·
IF 16.8
Shanyong Chen,Tao Luo,Xiaoqing Li,Kejun Chen,Qiyou Wang,Junwei Fu,Kang Liu,Chao Ma,Ying-Rui Lu,Hongmei Li,Kishan S. Menghrajani,Changxu Liu,Stefan A. Maier,Ting-Shan Chan,Min Liu
Metal-nitrogen-carbon single-atom catalysts (SACs) have emerged as promising candidates for electrocatalytic CO 2 reduction reaction. However, the perpendicular d z 2 orbital within planar metal site mainly interacts with *COOH, resulting in inferior CO 2 activation. Inspired by reaction-driven active configuration, here we propose to upshift nickel single-atom away from nitrogen-carbon substrate, prominently promoting the interaction between CO 2 and other d orbitals besides d z 2 . Theoretical and experimental analyses reveal that upshifting nickel site away substrate induces d xz , d yz , and d z 2 to hybridize with CO 2 , expediting CO 2 conversion to *COOH. The planar and out-of-plane Ni-N sites are formed on carbon nanosheet (Ni 1 -N/C NS ) and curved nanoparticle (Ni 1 -N/C NP ), respectively, which is verified by X-ray absorption fine structure spectroscopy. Impressively, the Ni 1 -N/C NP presents CO Faradaic efficiency of 96.4 % at 500 mA cm −2 and energy conversion efficiency of 79.8 % in flow cell, outperforming Ni 1 -N/C NS and most SACs. This work highlights the simulation of reaction-driven active sites for efficient electrocatalysis .
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高影响因子
International Journal of Electrochemical Science
·
2025
·
IF 2.4
Gaosheng Nie,Xiongfei Sun,Liyin Xu,Ke Wu,Zilong Wei,Shuwu Liu
MOF-derived cobalt oxides (CoO x ) have attracted extensive attentions due to their excellent theoretical specific capacitances, permanent porosity and controllable structures. However, the inherent poor conductivity of single-component cobalt oxide, and the structural collapse, pore loss and agglomeration during pyrolysis process are still the main factors to limit the performance of CoO x . Structure design of 3D hierarchical porous heterostructure composites through 0D/1D/2D materials is an effective strategy for boosting the capacitive performance of CoO x . Herein, the rationally designed 3D hierarchically porous CoO x /MWCNTs/rGO ternary hybrid composite was constructed through high-temperature pyrolysis of a facile self-assembled 0D/1D/2D Co-MOF/MWCNTs/GO precursor. Indeed, The CoO x /MWCNTs/rGO electrode exhibited an excellent specific capacitance of 520 F g −1 at 0.5 A g −1 , outstanding rate capability of 80.77 % capacitance retention even at 20 A g −1 , and ideal durability with about 8.4 % capacitance decay after 10000 cycles. Moreover, the CoO x /MWCNTs/rGO exhibited a maximum energy density of 14.6 Wh kg −1 with a power density of 41.2 W kg −1 .
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JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
·
2024
·Vol. 31
·期 6
·1502-1513
·
IF 3.1
Yang Bo-lin,Kuang Chang-liu,Liu Zheng-long,Yu Chao,Deng Cheng-ji,Ding Jun
ZrB 2 -based ceramic composites were prepared by spark plasma sintering using ZrB 2 powder prepared by molten salt method as raw material and SiC and nano-graphite as additives. The effects of nano-graphite addition on the physical properties and oxidation resistance of ZrB 2 -based ceramic samples were investigated. The results show that the addition of an appropriate amount of nano-graphite can effectively improve the density of ZrB 2 -based ceramic composites and improve the physical properties of the materials. The flexural strength of the ceramic sample with 8 vol.% nano-graphite reached 418.54 MPa, which was 53.14% higher than that of ZrB 2 –SiC ceramic material (273.31 MPa), and its oxidation resistance was also significantly improved. It demonstrats that the addition of an appropriate amount of nano-graphite can effectively improve the physical properties and oxidation resistance of ZrB 2 –SiC ceramic composites. Via prolonging its service life in application and promoting the development of ZrB 2 -based ceramic composites, it is of great significance for clean steel smelting.
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危险品化学品经营许可证（带存储）