ChemElectroChem
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2020
·Vol. 7
·期 14
·3116-3122
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IF 4.154
Sheng Song,Xiaoming Zhang,Xinlong Xu,Chuchu Wu,Huanqiao Li,Zhangxun Xia,Shansheng Yu,Suli Wang,Gongquan Sun
Graphical Strat talks : The density of FeN x active sites is increased by co-doping with trace Cu atoms. The as-prepared 20Fe10Cu-NC electrocatalyst exhibits outstanding oxygen reduction reaction performance in both alkaline and acid conditions. Iron-nitrogen-doped carbon (Fe-NC) is an ideal candidate to replace Pt-based oxygen reduction reaction (ORR) electrocatalysts due to its low cost and comparably high intrinsic activity. To further enhance the ORR performance of Fe-NC electrocatalysts, efforts have been focused on two main methods. One is to enhance the intrinsic activity of FeN x sites through electronic and geometric regulation, and the other is to increase the density of active sites by introducing high-nitrogen-containing precursors or co-doping methods. Herein, we report a strategy to further increase the Fe loading through the introduction of a trace amount of Cu atoms. Significant enhancement of the electrocatalytic ORR property is observed in the as-prepared Fe and Cu co-doped electrocatalyst with superior half-wave potential (E 1/2 ) in both alkaline and acid electrolyte. Experimental and theoretical study reveals that the introduction of a trace amount of Cu atoms is beneficial for the formation of FeN 4 sites, owing to the reduced formation energy. This work opens up a wide avenue to further increase the Fe loading in Fe-NC electrocatalysts through bimetal co-doping method.
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ChemElectroChem
·
2020
·Vol. 7
·期 15
·3311-3318
·
IF 4.154
Jianfa Chen,Chong Lin,Mengmeng Zhang,Tianxiang Jin,Yong Qian
Graphical Double doping : We develop a simple and efficient method to prepare N and Se co-doped graphene aerogel (NSeGA) as binder-free electrodes for supercapacitor applications. The results proved that Se is an efficient doping element for carbon-based materials. Furthermore, benefiting from the synergistic effect between N and Se, the NSeGA electrode shows a high specific capacity of 302.9 F g −1 at 1 A g −1 , and a high capacity retention of >94 % after 12,000 cycles. In this work, we demonstrate the successful synthesis of nitrogen and selenium co-doping graphene aerogels (NSeGA) by a convenient and scalable approach. It was found that Se is an effective doping element for improving the energy storage performance of graphene. The synergistic effect between N and Se on improving the performance of supercapacitor was also confirmed. The binder-free NSeGA electrode exhibited a high specific capacity of 302.9 F g −1 at a current density of 1 A g −1 , which is much higher than that of singly Se-doped graphene aerogel (SeGA, 183.92 F g −1 ) and singly N-doped graphene aerogel (NGA, 150.16 F g −1 ). Even though the current density reached up to 10 A g −1 , 90.4 % of its specific capacitance was maintained. The NSeGA also maintained about 94.1 % of the initial capacitance after 12,000 cycles at a current density of 2 A g −1 . Moreover, the constructed NSeGA//NSeGA symmetric supercapacitor showed a high energy density of 26.3 W h kg −1 at a power density of 900 W kg −1 . Accordingly, as a new type of carbon-based material, NSeGA has a good prospect in the field of supercapacitors.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
·
IF 4.939
Xuezhen Zhu,Haisheng Tao,Maoguo Li
Prussian blue analogue with a typical metal-organic framework has been widely used as an electrode material in supercapacitor . In this work, nickel cobalt hexacyanoferrate (Ni 2 CoHCF) was grown on nickel foam directly using a simple co-precipitation method. The as-prepared Ni 2 CoHCF was tested by transmission electron microscope, scanning electron microscope , X-ray diffraction and X-ray electron energy spectrum. The results showed that Ni 2 CoHCF has a unique open face-centered cubic structure. The Ni 2 CoHCF was used to set an asymmetric supercapacitor directly. A series of electrochemical tests showed that Ni 2 CoHCF had an excellent electrochemical performance. The specific capacitance of the supercapacitor was 585 C g −1 (1300.0 F g −1 , 162.5 mAh g −1 ) at the current density of 0.5 A g −1 . After 2000 cycles, it still maintained 85.57% of its initial specific capacitance at the current density of 10 A g −1 . The energy density was 30.59 Wh kg −1 at the power density of 378.7 W kg −1 . The results show that the supercapacitor constructed by Ni 2 CoHCF as an electrode material has high-current charge-discharge capacity, high energy density and long cycle life.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2020
·Vol. 27
·期 18
·22806-22817
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IF 3.056
Li Jie,Yu Guangwei,Pan Lanjia,Li Chunxing,You Futian,Wang Yin
Antibiotics residues in aqueous environment and sewage sludge accumulation have become serious environmental issues. The aim of this study is to investigate the potential of ciprofloxacin (CIP) removal by sludge-based biochar prepared from co-pyrolysis of sewage sludge and bamboo waste (BW). The stability and environmental risk of heavy metals (HMs) in the biochar were further investigated to evaluate potential risks for biochar utilization. Results showed that BW was an outstanding additive to prepare co-pyrolyzed biochar from sludge. A higher CIP removal rate (95%) of BW-sludge biochar (SBC) was obtained under initial CIP concentration of 10 mg/L, and its maximum adsorption capacity was 62.48 mg/g which was calculated from the Langmuir model. The pseudo-second-order and Freundlich model also well fit the CIP adsorption process, indicating a chemical and multilayer adsorption of CIP on a heterogeneous surface of biochar. Adsorption mechanism analysis indicated that the diverse functional groups and Fe species in biochar probably were the dominant factors in the adsorption of CIP. The π-π interaction, H–bond, ion exchange, and Fe-complexation might be the main interactions between the functional species and CIP molecules. Besides, HMs, especially the Cr, Cd, and As, were well immobilized in SBC compared with pure sludge biochar. This work suggested that sludge-based biochar, especially the co-pyrolyzed SBC, could be a potential adsorbent for CIP removal from aqueous solutions.
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ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Jinsong Shi,Nanfu Yan,Hongmin Cui,Jianguo Xu,Yuewei Liu,Shaowei Zhang
Because of their high stability, low cost, and tunable porosity, porous carbons are of great interest as CO2 adsorbents. The influences of porosity and heteroatom doping on CO2 adsorption depend on the specific adsorption conditions. In the current work, nitrogen and sulfur co-doped carbons were prepared with the assistance of an NaCl template, and the effects of different physicochemical parameters on CO2 adsorption at 20 bar were investigated. The co-doped carbons were synthesized with sodium lignosulfonate as the starting material and urea as the nitrogen source. The material showed a high specific surface area and pore volume of 973 m2/g and 0.50 cm3/g, respectively. Sulfur-doped carbons were also prepared without the addition of urea. Sulfur doping demonstrated positive effects on CO2 adsorption at a low pressure. The sulfur-doped carbons showed adsorption properties similar to those of the co-doped carbons. The CO2 uptake at 298 K and 20 bar was in the range of 4.3–7.5 mmol/g. The experiment results also revealed that the uptake at 20 bar correlated to the specific surface area of the carbon, while the doped heteroatoms only had secondary influences.
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ACS Applied Materials & Interfaces
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2019
·
IF 8.456
Fucheng Wang,Jiajun Li,Chunsheng Shi,Enzuo Liu,Chunnian He,Naiqin Zhao
Ceramic phase reinforced aluminum matrix composites (CAMCs) are widely used in high-tech fields represented by aerospace industry due to their advantages of high specific strength, high specific modulus, high thermal stability, and light weight. Strong interface bonding is a prerequisite for high performance of multiphase materials. Herein, a novel CAMC in situ reinforced by MgAl2O4 particles and MgAlB4 nanorods was prepared by vacuum hot-pressing combined with hot-extrusion process. A high-resolution transmission electron microscope was used to characterize the orientation relationship and interface structure between the ceramic phases and the aluminum matrix. Two orientation relationships (OR1 and OR2) of MgAl2O4/Al and one (OR3) of MgAlB4/Al are determined: OR1-[011]p//[011]Al, (11̅1)p//(11̅1)Al; OR2-[211]p//[011]Al, (113̅)p//(022̅)Al; OR3-[101̅0]R//[001]Al, (0002)R//(2̅20)Al. The MgAl2O4 in OR1 forms a coherent interface with the aluminum matrix at (111) surface, while they form a 4 × 5 near coincidence site lattice (CSL) interface structure for OR2. In OR3, the MgAlB4 forms an approximate coherent interface with Al matrix at its (0002) surface and a 2 × 5 CSL interface structure at its (011̅0) surface. First-principles calculations suggest that MgAl2O4 combines to aluminum at (111) plane through covalent bonds, which means high interfacial bonding strength. The hot-extrusion process makes the ceramic phase evenly distributed in the matrix. The mechanical properties of the composites are greatly improved compared with pure aluminum.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Chuanmin Zhang,Shubiao Zhang,Defu Zhi,Yinan Zhao,Shaohui Cui,Jingnan Cui
This work designed a new delivery system (L-PTX-PSur), which could efficiently co-deliver paclitaxel (PTX) and survivin siRNA (Sur) to overcome the dose-limiting toxicity by effectively accumulating PTX in tumor and obtain enhanced therapy by synergistic effect. In this co-delivery system, protamine was selected to condense siRNA into a compacted ‘core’, and a carbamate-linked cationic lipid was used to develop PTX-loaded liposome to entrap the core. L-PTX-PSur with protamine could facilitate Sur entry into NCI-H460 cells and exhibited high encapsulation efficiency of PTX. In vitro studies on the NCI-H460 lung cancer cells revealed that L-PTX-PSur offered significant advantages over the control groups, and it had the highest cellular uptake, the lowest cell viability and the strongest apoptosis. Western blot result showed that survivin protein expression could be noticeably suppressed by L-PTX-PSur in NCI-H460 cells. And the down-regulation of survivin protein could lower the apoptotic threshold of cancer cells and render PTX more effective with low doses. Collectively, L-PTX-PSur with a low dose of PTX could induce a synergistic inhibitory effect on cancer cells growth by the collaboration of PTX and Sur. This work provides a promising strategy for the treatment of lung cancer.
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ACTA MATERIALIA
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2019
·
IF 7.293
Ruixuan Song,Yu Zhao,Weili Li,Yang Yu,Jie Sheng,Ze Li,Yulei Zhang,Hetian Xia,Wei-Dong Fei
Low temperature stability has limited the applications at elevated temperature for ABO 3 -type lead-free ceramics. And multi-grade resonances of piezoelectric ceramics are hardly obtained although the resonances are very important in some applications such as filter and resonator . High piezoelectric properties and large mechanical quality factors with multi-grade resonances can be obtained in (Li + -La 3+ ) co-doped BaTiO 3 ceramics, and excellent temperature stabilities are achieved in the ceramics. It has been shown that the thermal treatments both with and without electric field at 200 °C improve the piezoelectric properties and thermal stability further. Large piezoelectric constant (272 pC N 1 ) and huge mechanical quality factor (2010) was obtained after thermal-electrical treatment, which is caused by Li + -La 3+ ionic pair aligning along the external electric filed during thermal-electrical treatment. Moreover, the present study provides an effective method to design combination properties with high temperature stability for ABO 3 perovskite ferroelectric ceramics .
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 10
·28247-28258
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IF 5.19
Shi Guangyu,Hu Jiayuan,Cheng Yuanyuan,Shi Weilin,Chen Yan
The effect of Pseudomonas aeruginosa ( P. aeruginosa ) on the phytoremediation efficiency of ryegrass on soil contaminated with nonylphenol (NP) and cadmium (Cd) was investigated by pot experiments. Pseudomonas aeruginosa application stimulated the adsorption of Cd by ryegrass and facilitated the biodegradation of NP in the soil. Exogenous P. aeruginosa inoculation increased the activities of urease, dehydrogenase, and polyphenol oxidase in the soil of the T4 treatment by 38.5%, 50.0%, and 56.5% compared to that of the T2 treatment, respectively. There was a significant positive correlation between the activities of dehydrogenase and polyphenol oxidase and the NP removal rate ( P < 0.001). The relative abundances of beneficial microorganisms (such as Sphingomonas , Lysobacter , Streptomyces , Chloroflexia, Deltaproteobacteria, and Alphaproteobacteria) were increased as a result of P. aeruginosa inoculation. These microorganisms play important roles in nutrient cycling, Cd adsorption, and NP degradation. Additionally, P. aeruginosa was not the dominate bacterial species at the end of the experiment. According to this study, P. aeruginosa application improved the phytoremediation efficiency of ryegrass on soil contaminated with NP and Cd, with a minimal risk of alien microbial invasion.
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ACS Omega
·
2022
·
IF 4.132
Tianxiang Jin,Jingwei Su,Qingyun Luo,Wei Zhu,Haizhen Lai,Dejuan Huang,Chunyan Wang
Biomass-derived activated carbon is a widely used electrode material for supercapacitors. One of the keys to preparing high-performance activated carbon is the selection of appropriate precursors. Daylily is a common edible herb and is widely planted in Asia. It is rich in nitrogen and phosphorus, so it can be used as a precursor of heteroatom-doped activated carbon. Herein, a daylily-derived porous carbon with a large specific surface area and high content of heteroatoms has been successfully prepared by a simple carbonization method. The as-prepared carbon materials showed a remarkable specific capacitance of 299.1 F/g at 0.5 A/g and excellent cycling stability of 99.6% after 4000 cycles at a current density of 1 A/g. Moreover, the assembled symmetric supercapacitor showed a high energy density of 21.6 Wh/kg at a power density of 598.2 W/kg in 6 M KOH electrolyte. These results demonstrate that the daylily-derived porous carbon is an excellent material for high-performance supercapacitors.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2022
·
IF 7.926
Yan Shao,Han Wu,Wenshan Huang,Qijie Jin,Longji Wu,Xueying Zhang,Haitao Xu
For the treatment of antibiotics contained wastewater, developing a highly efficient catalyst is key to peroxymonosulfate (PMS) activation and antibiotics degradation. In this work, nitrogen-doped carbon nanosheets (NCS) coated sintered metal fibers (SMFs) catalyst was designed and developed, which could positively promote the contacting efficiency between PMS , TC and catalysts. In specific, by the dip-coating of SMFs in the cobalt-contained dicyandiamide formaldehyde resin and the following pyrolyzing coordinated polymer procedure, it was possible to create a Co-doped NCS catalyst supported on SMFs. NCS with abundant exposed surface active sites could result in a relatively higher catalytic activity . Microscopy studies confirmed the presence of stacked NCS with high Co active sites loading, which was anchored on the surface of SMFs. The developed Co NCS/SMFs catalyst exhibited a highly degradation efficiency of 96% in 240 min. Effects of operating parameters (including PMS concentration and solution pH) on the TC elimination efficicency were also investigated. Additionally, Co NCS/SMFs exhibited good PMS activation activity in the wide pH range of 2.0–9.0, and acceptable recyclability with over 86% TC removal efficiency after five cycles test. According to SEM , XRD and XPS results, highly exposed active metal sites, O defects, Co-N x sites and reactivity of Co 0 in Co NCS/SMFs played an important role in the enhancement of degradation efficiency. Finally, radical inhibition experiment and corresponding EPR test revealedthe presence of S O 4 ∙ − , ∙OH , O 2 ∙ − and 1 O 2 in the TC degradation system, in which singlet oxygen ( 1 O 2 ) was demonstrated to be the dominating reactive species for PMS activation and TC degradation. This work provided an efficient strategy for developing robust monolithic lamellar catalyst for the continuous PMS activated degradation of TC.
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INORGANICA CHIMICA ACTA
·
2022
·
IF 3.118
Xian-Xian Ji,Liu Yang,Yu-Long Liu,Ying Fu,Fei Ye
The synergistic effect of graphene and doping elements is vital to improve the electrocatalytic performance. However, it is still a challenge to select appropriate elements for doping to improve the rate of hydrogen evolution reaction (HER). In this study, we prepared a highly efficient and promising electrocatalyst, namely CoMoO 4 /Co 2 Mo 3 O 8 @C , by a carburization process of metal–organic frameworks (MOFs) combined with doping molybdenum via simple hydrothermal and pyrolysis method. Compared with Co-MOF , CoMoO 4 /Co 2 Mo 3 O 8 @C exhibited excellent electrocatalytic performance with an overpotential as low as 120 mV at 10 mA·cm −2 and a Tafel slope as small as 69 mV·dec −1 for HER activity in 0.5 M H 2 SO 4 . The excellent performance of CoMoO 4 /Co 2 Mo 3 O 8 @C could be ascribed to the synergistic effect of CoMoO 4 /Co 2 Mo 3 O 8 and graphene coating, which facilitated charge transfer in HER activity. This work may provide novel perspectives for fabricating electrocatalysts composed of transition metal oxide and graphene based on MOFs for enhancing HER performance.
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