DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 29
·10203-10211
·
IF 4.174
Shaobin Li,Jing Pan,Fengbo Li,Li Zhang,Dongfeng Chai,Zhuanfang Zhang,Jianjiao Xin
A simple continuous hydrothermal method was used to synthesize a NiFe2O4@Ni–Mn LDH/NF composite. The layered structure provides a large void to transfer the electron effectively, and the composite materials exhibit remarkable electrochemical performance including excellent specific capacitance (1265 F g−1 at 1 A g−1) and remarkable cycling stability (the specific capacitance remains at 80.9% after 5000 cycles). In addition, the asymmetric supercapacitor exhibits a high energy density of 96.2 W h kg−1 at a power density of 700 W kg−1, and there is an extraordinarily good cycling stability with a capacity retention rate of 92.5% after 4000 cycles. The outcomes indicate that the NiFe2O4@Ni–Mn LDH/NF composite electrode has potential application as a high-performance supercapacitor.
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高影响因子
MATERIALS TECHNOLOGY
·
2020
·
IF 1.738
Xiaohua Tian,Jiangdong Dai,Lulu Wang,Atian Xie,Jinsong He,Yongsheng Yan
Here, hierarchically N-doped porous carbon (HPNC) with very high surface area was prepared by a facile one-pot pyrolysis of ethylenediaminetetraacetic acid tripotassium salt dihydrate used as the carbon/nitrogen source and pore activating agent. The NiCo2O4 nanosheets were vertically grown onto the surface of HPNC (V-NiCo2O4/HPNC) via a urea homogeneous precipitation method by a microwave heating. Whereas the parallelly orientated NiCo2O4/HPNC (P-NiCo2O4/HPNC) was fabricated by a usual water-bath heating. The loading content of V-NiCo2O4/HPNC was higher than that of the P-NiCo2O4/HPNC, thus resulting in the larger specific capacitance. V-NiCo2O4/HPNC exhibited the high specific capacity (434.8 F g-1 at 1.0 A g-1), good rate performance, cycle stability (capacitance retention of 103% at 5 A g-1 after 1000 cycles) and lower resistance, owing to the synergistic advantages of HPNC and vertically orientated NiCo2O4 nanosheets, which provided high electrical conductivity, and effective electrolyte ions and electrons transport path.
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APPLIED ENERGY
·
2020
·
IF 8.848
Qianyang Chen,Qianyuan Qiu,Xiaomin Yan,Mingyang Zhou,Yapeng Zhang,Zhijun Liu,Weizi Cai,Wei Wang,Jiang Liu
The direct carbon solid oxide fuel cell is a potential technology that efficiently and cleanly converts the chemical energy of solid carbon into electricity. Its superiority of all-solid-state configuration and unique operating mechanism indicate that it has a good application prospect in high energy density portable or backup power supplys. It can also be used to convert coal into electrical power. Here, for the first time, we report a compact direct carbon solid oxide fuel cell stack with 12 cells fabricated on a single 10 × 10 cm electrolyte plate. The plate covers a container filled with solid carbon-rich fuel to form a stack. No sealant and pipelines are needed and the carbon-rich fuel can be reloaded. Both activated carbon and sawdust of bauhinia tree branch are used as the fuel. The output power of such a stack approaches more than 10 W at 800 °C. Using 15 g of 5 wt% Fe-loaded activated carbon as the fuel, a stack discharging at a constant current of 1.5 A outputs an energy of 29 Wh, correspongding to an energy desnity of carbon of ∼2000 Wh kg −1 . This work shows the feasibility of developing direct carbon solid oxide fuel cell into a compact electricity generator using readily available carbon-rich fuels. It also shows promise of using this technology in clean and efficient conversion of coal to electricity.
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DESALINATION
·
2020
·
IF 7.098
Danping Li,Xun-An Ning,Chenghai Yang,Xiaohui Chen,Yi Wang
Core-shell nanoparticles were prepared by coating magnetic nanoballs (Fe3O4) with highly cross-linked polymer poly(-cyclotriphosphazene-co-4,4′-sulfonyldiphenol) (PZS) to serve as heteroatomic-rich doping electrodes (MZPS). After formation by carbonization , C-MPZS acts like a flowing electrode used for flow-capacitive deionization (FCDI), which has fast ion transfer and diffusion performances because of its rich heteroatom content and the prominent synergistic effect of N, P, S atoms. Moreover, the FCDI performance of C-MPZS is enhanced due to its increased synergistic effect from its excellent available specific surface area, unique porous characteristics with large micro-/mesopores, and favorable conductivity with high graphitization . The optimal carbonization temperature was 500 °C with an optimum specific capacitance of 211.54 F g −1 , which was tested in a 1 M sodium chloride solution at a scan rate of 1 mV s −1 . Then, the C-MPZS flowing electrode was found to have a high electrosorption capacity (50.07 mg g −1 ), removal efficiency (68.50%) and removal rate (83.07%) at an applied potential of 1.0 V in a sodium chloride solution with a conductivity of 1200 μS cm −1 at 6 rpm. An additional cyclic test demonstrated good stability performance after 10 cycles due to the magnetic nanoparticles effect. Finally, through the successful application in tail water from printing and dyeing wastewater, the results indicated that the as-prepared C-MPZS flowing electrode has promise for application in high-performance electrochemical deionization.
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BIOMASS & BIOENERGY
·
2020
·
IF 3.551
Yun Li,Benkun Qi,Yinhua Wan
Lignocellulose pretreatment results in production of hydrolysate consisting of sugars and inhibitors. Previous reports have shown the viability of nanofiltration (NF) of lignocellulosic hydrolysate for simultaneous sugar concentration and inhibitors removal. However, the complexity of real hydrolysate results in severe membrane fouling which greatly hinders the further application of NF in treating biomass hydrolysate. In this investigation, conditioning of real rice straw hydrolysate from dilute acid pretreatment was conducted by three methods (sedimentation, microfiltration (MF) and activated carbon (AC) adsorption) in order to reduce subsequent NF membrane fouling. Results showed that the turbidity , suspended substance (SS) and particle size of SS of the hydrolysate considerably decreased after these three conditioning methods. Only AC adsorption, however, exhibited best performance in terms of increasing the volume reduction ratio (VRR) and decreasing the membrane fouling during NF filtration of rice straw hydrolysate, demonstrating the effectiveness of AC adsorption for hydrolysate conditioning. Further experiments confirmed that removal of phenolics and pigments , the two dominating foulants during NF process, by AC adsorption were most likely responsible for its superior performance compared to sedimentation and MF.
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RENEWABLE ENERGY
·
2020
·
IF 6.274
Yunwu Zheng,Jida Wang,Can Liu,Yi Lu,Xu Lin,Wenbin Li,Zhifeng Zheng
To eliminate the problematic need for liquid phase, high temperature, and high pressure, as well as the excessive consumption of hydrogen and production of aromatic hydrocarbons, associated with traditional aviation oil preparation processes, Ni–Cu bimetallic catalysts were synthesized and evaluated for ex situ catalytic pyrolysis vapor upgrading of oleic acid under a N 2 atmosphere. The effects of catalyst support (AC, Al 2 O 3 , ZrO 2 , HZSM-5, HUSY, Hβ and MCM-41), pyrolysis process parameters (pyrolysis temperature, catalytic temperature and amount of oleic acid injected), and the mixing ratio of modified metals (Ni:Cu = 0:1,2,1:1,1:2,1:0) on the catalytic conversion of oleic acid to high-quality chemicals were studied. The catalysts were characterized by XRD , BET and NH 3 -TPD. Modified bimetallic catalysts show great potential for green diesel production without the use of H 2 feed. The abundance of Brønsted acid sites favors HDO routes (such as HZSM-5, HUSY, Hβ and MCM-41), while Lewis acid sites (such as ZrO 2 and Al 2 O 3 ) favor hydrogenation and decarbonylation reactions. The addition of Cu enhances the reducibility of Ni and inhibits the cracking reaction and deactivation caused by coke. The addition of Ni effectively promotes the conversion of oleic acid, accelerates the fracture of C–C and effectively improves the production of hydrocarbons. The highest conversion was 100% with 85.68% selectivity towards hydrocarbons under pyrolysis at 450 °C, a catalytic temperature of 500 °C, and a feed quantity of oleic acid of 0.25 ml/min using Ni–2Cu/MCM-41 catalysts, and the oxygen removal efficiency and selectivity of C17 hydrocarbon were the highest (85.68% and 26.77%, respectively). The main products were olefins . In addition, the regenerated catalyst had good stability and could be used for at least 3 reaction cycles without observation of significant deactivation.
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RSC Advances
·
2020
·Vol. 10
·期 16
·9299-9308
·
IF 3.119
Chaojing Yan,Mengyuan Jin,Xinxin Pan,Longli Ma,Xiaohua Ma
A simple polymerization process assisted with UV light for preparing a novel flexible polyelectrolyte-based gel polymer electrolyte (PGPE) is reported. Due to the existence of charged groups in the polyelectrolyte matrix, the PGPE exhibits favorable mechanical strength and excellent ionic conductivity (66.8 mS cm−1 at 25 °C). In addition, the all-solid-state supercapacitor fabricated with a PGPE membrane and activated carbon electrodes shows outstanding electrochemical performance. The specific capacitance of the PGPE supercapacitor is 64.92 F g−1 at 1 A g−1, and the device shows a maximum energy density of 13.26 W h kg−1 and a maximum power density of 2.26 kW kg−1. After 10 000 cycles at a current density of 2 A g−1, the all-solid-state supercapacitor with PGPE reveals a capacitance retention of 94.63%. Furthermore, the specific capacitance and charge–discharge behaviors of the flexible PGPE device hardly change with the bending states.
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高影响因子
Materials
·
2020
·Vol. 13
·期 7
·1513
·
IF 3.057
Jialing Kang,Mengjia Wang,Chenbao Lu,Changchun Ke,Pan Liu,Jinhui Zhu,Feng Qiu,Xiaodong Zhuang
Due to the growing demand for energy and imminent environmental issues, hydrogen energy has attracted widespread attention as an alternative to traditional fossil energy. Platinum (Pt) catalytic hydrogen evolution reaction (HER) is a promising technology to produce hydrogen because the consumed electricity can be generated from renewable energy. To overcome the high cost of Pt, one effective strategy is decreasing the Pt nanoparticle (NP) size from submicron to nano-scale or even down to single atom level for efficient interacting water molecules. Herein, atomically dispersed Pt and ultra-fine Pt NPs embedded porous carbons were prepared through the pyrolysis of Pt porphyrin-based conjugated microporous polymer. As-prepared electrocatalyst exhibit high HER activity with overpotential of down to 31 mV at 10 mA cm−2, and mass activity of up to 1.3 A mgPt−1at overpotential of 100 mV, which is double of commercial Pt/C (0.66 A mgPt−1). Such promising performance can be ascribed to the synergistic effect of the atomically dispersed Pt and ultra-fine Pt NPs. This work provides a new strategy to prepare porous carbons with both atomically dispersed metal active sites and corresponding metal NPs for various electrocatalysis, such as oxygen reduction reaction, carbon dioxide reduction, etc.Keywords:platinum;atomically dispersed active site;nanoparticle;porous carbon;hydrogen evolution reaction
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BIOMEDICAL CHROMATOGRAPHY
·
2020
·Vol. 34
·期 7
·e4834
·
IF 1.728
Xiaoyue Shan,Siwei Tan,Yanpeng Shi,Ji Shao,Kewen Su,Ling Zhang,Hui Feng,Haipeng Ye
In this study, activated carbon/diatomite-based magnetic nancomposites (denoted as AC/DBMNs) were synthesized and applied as an adsorbent for magnetic solid-phase extraction of S- phenylmercapturic acid ( S- PMA) from human urine prior to high-performance liquid chromatography. The surface morphologies and structures of AC/DBMNs were characterized by Fourier transform infrared spectroscopy, transmission and scanning electron microscopy, X-ray diffraction, Brunauer–Emmett–Teller surface area, vibrating sample magnetometer and ζ -potential measurements. The experimental parameters including sample volume, sample pH, adsorbent amount, extraction time, elution solvent and desorption time were investigated in detail. Under the optimum conditions, the method exhibited good linearity ( r > 0.9993) within the concentration ranges of 0.03–1.0 mg/L. Moreover, the limits of detection and quantification were 0.01 and 0.03 mg/L, respectively. The enrichment factor was 5, and good recoveries (88.9–97.3%) with relative standard deviations in the range of 5.6–6.8% ( n = 6) for inter-day and 6.3–8.1% ( n = 6) for intra-day were achieved. The developed method was successfully applied to the analysis of S- PMA in urine samples. In addition, this accurate and sensitive method has great potential to be applied in the early screening and clinical diagnosis of the workers exposed to benzene.
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MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Daman Xu,Genhui Teng,Yingqi Heng,Zhizhong Chen,Dongying Hu
The transparent and renewable porous cellulose separators (ACR-3, ACR-5, ACR-7, ACR-9) with different concentration of cellulose solution (3 wt%, 5 wt%, 7 wt%, 9 wt%) were prepared via a phase-inversion process with 1-allyl-3-methylimidazolium chloride (AMIM-Cl) as the solvent. Cellulose separators displayed high thermal stability, strong mechanical properties and excellent apparent properties. ACR-7 separator showed a higher porosity of 74.90% and electrolyte uptake of 323.68% with a smaller pore size and a more uniform pore structure compared with the other cellulose separators. The assembled supercapacitors (electrode/separator/electrode, SCD-7) showed good electrochemical performances in many aspects, including a lower equivalent series resistance of 0.5Ω, a higher charge-discharge efficiency of 98.58% at 3 A/g and areal capacitance of 1.15 F cm −2 at 5 mV/s than the SCD-3, SCD-5, SCD-9 and the assembled SCDs with two commercial separators (TF4040 for SCD-40 and MPF30AC for SCD-30). SCD-7 showed a high retention of 81.99% after 4000 charge-discharge tests at 1 A/g, showing a good charge-discharge cycle stability. Compared with SCD-40 and SCD-30, SCD-7 showed a lower voltage drop below 0.03 V, a higher specific capacitance of 130 F/g, energy density of 25.94 Wh/kg and power density of 0.36 kW/kg at 0.5 A/g. Overall, ACR-7 is expected to be applied as a separator in the field of supercapacitors.
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ACS Applied Nano Materials
·
2020
·
IF 0
Zidong Wang,Zhe Chu,Chunwei Dong,Ze Wang,Shiyu Yao,Hang Gao,Zhaoyu Liu,Yi Liu,Bai Yang,Hao Zhang
As a family of semiconductor photocatalysts, Sillén-type bismuth oxyhalides (BiOX, X = Cl, Br, I) have attracted widespread interest due to their excellent photocatalytic activity and photoconductivity. However, most current strategies on synthesizing ultrathin 2D BiOX nanosheets (NSs) rely on high temperature and pressure and complex procedures, which seriously confine their large-scale applications. Herein, we develop a simple and facile two-phase method for the synthesis of ultrathin 2D BiOX NSs with highly exposed {001} facets. On the basis of systematically studying the effects of various reaction parameters on the size, thickness, morphology, and composition of the products, the growth mechanism of ultrathin 2D BiOX NSs is presented, which indicates that the suppression of Bi3+ hydrolysis is required for the growth of 2D BiOX NSs with highly exposed {001} facets. The acidic condition prefers the growth of BiOX NSs with ultrathin structure and high crystallinity along the [001] zone axis. By using BiOBr NSs as the example, the photocatalytic activities of ultrathin 2D BiOX NSs are evaluated upon photodegradation of organic compounds and photocatalytic water oxidation. The results show that the organic compound photodegradation is mainly determined by the specific surface area of BiOBr NSs, while the O2 evolution rate of BiOBr NSs for water oxidation is dependent on their photogenerated charge separation efficiency. Because of the larger specific surface area and higher photogenerated charge separation efficiency, BiOBr-acid-0.5 ultrathin 2D NSs exhibits the fastest organic compound photodegradation rate and O2 evolution rate of 445.6 μmol g–1 h–1.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Dongxu Yang,Jun Li,Liang Luo,Ruoyu Deng,Qiang He,Yi Chen
Fluoroquinolone antibiotic pollutants can irreversibly harm human health and aquatic organisms. Their removal remains an important challenge, because of the limited availability of practical adsorbents. Herein, we propose a porous carbon sheet (PCS-900) derived from waste biomass as a precursor for the decontamination of levofloxacin (LFC). Batch studies show that PCS-900 provided a high removal efficiency of 99.64% within 10 min, a maximum adsorption capacity of 754.12 mg/g, a wide applicable pH range, and a selectivity for LFC removal. The LFC can be sequestrated rapidly from different real water matrixes, indicating potentially practical application value. Micropore filling and π–π electron donor acceptor (EDA) interactions were responsible for the LFC removal mechanisms, which were confirmed by BET and FT-IR, Raman and theoretical calculation. BET analysis indicated a shrinking specific surface area and total pore volume. FT-IR and Raman spectroscopy showed a red shift of –OH stretching vibration and decreased intensity ratios of I D /I G after LFC adsorption, respectively. The theoretical simulation showed that various forms of LFC had strong interactions with the PCS-900. The closest interaction distance of LFC with PCS-900 was 2.52 Å via π–π stacking configurations. These findings could provide a reference for the fabrication of efficient antibiotic adsorbents from waste biomass in water remediation.
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危险品化学品经营许可证（带存储）