ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Tian Yu,Suiting Ning,Qian Liu,Tingting Zhang,Xiangbin Chen,Ning Qi,Xianli Su,Xinfeng Tang,Zhiquan Chen
As a liquid-like material, CuAgSe has high carrier mobility and ultralow lattice thermal conductivity. It undergoes an n–p conduction-type transition during β- to α-phase transition with increasing temperature. Moreover, optimization of the thermoelectric performance of CuAgSe is rather difficult, owing to the two-carrier conduction in this material. In this work, we reported the free tuning of the conduction type and thermoelectric performance of CuAgSe by manipulating the cation vacancies. Positron annihilation measurements reveal that the increase in CuAg content can effectively suppress the cation vacancies and reduce the hole carrier concentration, resulting in n-type conduction at high temperatures. Doping with Zn at the Cu sublattice in the CuAg-excessive CuAgSe can further decrease the number of vacancies, leading to a significant decrease in hole carrier concentration. Furthermore, the reduction of vacancies leads to weakening of carrier scattering. As a result, carrier mobility is also enhanced, thus improving the thermoelectric performance of n-type CuAgSe. On the other hand, high-performance p-type CuAgSe can be achieved by decreasing the CuAg content to introduce more cation vacancies. Ultimately, both n-type and p-type CuAgSe with superb thermoelectric performance are obtained, with a zTmax of 0.84 in Cu1.01Ag1.02Zn0.01Se (n-type) and 1.05 in (CuAg)0.96Se (p-type) at 600 K and average zT of 0.77 and 0.94 between 470 and 630 K for n-type and p-type, respectively.
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高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Kaixiang Ji,Fangshuo Liu,Tesfaye Hailemariam Barkae,Shuai Quan,Abdallah M. Zeid,Wei Zhang,Jianping Li,Guobao Xu
N -hydroxyphthalimide (NHPI) is an efficient organic catalyst and an important chemical raw material which can be used as an intermediate in organic synthesis of drugs and pesticides. In this study, NHPI has been used as a coreactant of lucigenin chemiluminescence (CL) for the first time. The CL of the developed system is significantly enhanced in the presence of Co 2+ . Therefore, we developed a novel lucigenin-NHPI CL method coupled with flow injection analysis for the sensitive, precise, and selective determination of Co 2+ . The linear range of this method is 1–1000 nM, and the detection limit is 67 pM (S/N = 3). In addition, this method has a good selectivity for Co 2+ . It has been applied to the detection of Co 2+ in lake water, and the standard recovery rate is 95.9–103.2%, indicating that the method is feasible.
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高影响因子
Catalysts
·
2022
·Vol. 12
·期 11
·1449
·
IF 4.501
Haiqin Lu,Guilu Xu,Lu Gan
In the present study, nitrogen doped biochar (N-PPB) and nitrogen doped activated biochar (AN-PPB) were prepared and used for removing bisphenol A (BPA) in water through activating peroxymonosulfate. It was found from the results that N-PPB exhibited superior catalytic performance over pristine biochar since nitrogen could brought about abundant active sites to the biochar structure. The non-radical singlet oxygen (1O2) was determined to be the dominant active species responsible for BPA degradation. Having non-radical pathway in the N-PPB/PMS system, the BPA degradation was barely influenced by many external environmental factors including solution pH value, temperature, foreign organic, and inorganic matters. Furthermore, AN-PPB had richer porosity than N-PPB, which showed even faster BPA removal efficiency than N-PPB through an adsorptive/catalytic synergy. The finding of this study introduces a novel way of designing hieratical structured biochar catalysts for effective organic pollutant removal in water.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 4
·1791-1799
·
IF 3.591
Jing-Jiang Liu,Fu-Hu Guo,Fu-Jun Cui,Ji-Hua Zhu,Xiao-Yu Liu,Arif Ullah,Xi-Cun Wang,Zheng-Jun Quan
N-doped porous carbon (NC) was synthesized from sugar cane bagasse, which is a sustainable and widely available biomass waste. The preferred NC sample had a well-developed porous structure, a graphene-like surface morphology and different N species. More importantly, the heterogeneous carbocatalyst exhibited superior catalytic performance in the aerobic dehydrogenation of various heterocyclic nitrogen compounds (49 examples, up to 96% yield), similar to that of C3N4 and GO. Characterization by TEM, BET and XPS accompanied by the EPR analysis revealed that the enhanced catalytic properties of NC came from its high activation ability for both O2 and heterocyclic nitrogen, attributed to the porous structure and pyridinic N (N-6) species, respectively.
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高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Zailin Gong,Shujin Li,Weifang Han,Jiaping Wang,Jun Ma,Xiangdong Zhang
The graphene oxide (GO) was synthesized with Brodie's method and grafted with poly ( N -isopropylacrylamide) (NIPAM) in aqueous solution at ambient temperature. Compared with the initial GO, the PNIPAM graft GO (GO-PNIPAM) has larger surface area, pore volume and self-flocculation effect with rapid response to temperature. Moreover, the GO-PNIPAM also has selective adsorptions with different phenol pollutants because of the different interactions of hydrogen bonds and the molecule structure of the adsorbates. Compared with phenol and bisphenol A, hydroquinone has better adsorption on GO-PNIPAM because of the ample phenolic hydroxyl group and the appropriate molecule structure. The adsorption performance of hydroquinone on GO-PNIPAM is also temperature sensitive because of the thermoresponsive transition of the hydrogen bond. The thermoresponsive adsorption and self-flocculation will make the GO-PNIPAM recyclable in the potential water remediation.
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高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2018
·
IF 5.16
Hui Ma,Huanxia Zhang,Jianda Cao,Mingqiong Tong,Jianwei Zhao,Yifei Li,Hong Xu,Wen Wu
In this work, temperature-responsive poly(N-isopropylacrylamide) (PNIPAm) was covalently grafted onto the edge of graphene oxide (GO) sheets through a facial method cross-linked by 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC·HCl) and N-hydroxysuccinimide in aqueous solution at room temperature. Then, the dispersion was wet spun to form a GO composite fiber . Scanning electron microscopy images suggest that severe edge distortions occur in PNIPAm-g-rGO hybrid fibers, indicating the covalent attaching of PNIPAm molecules onto the edge of graphene sheets . The PNIPAm-g-rGO fibers showed more favorable and improved electrical property than the pristine rGO fibers. Moreover, the coil-to-globule transition of the end-grafted PNIPAm chains was partially restricted by graphene sheets in the composite fiber, thereby causing the elevation of the phase transition temperature. Switching test of temperature-responsive versus electrical conductivity function has proved that the observed temperature-induced electrical conversion of the fibers was highly reversible and reproducible. Simultaneously, the composite fiber exhibited higher piezoresistive sensitivity compared with neat fiber. This smart fiber has shown remarkable potential for intelligent strain sensors, textiles, actuators, wires and on/off switches.
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高影响因子
ACS Applied Energy Materials
·
2018
·
IF 0
Guanghe Dong,Huanlei Wang,Wei Liu,Jing Shi,Shijiao Sun,Dong Li,Hao Zhang,Yunpeng Yang,Yongpeng Cui
Hybrid sodium ion capacitors have been considered promising energy storage devices with superior energy and power performances by combining the advantages of batteries and supercapacitors. However, it is desirable to design anode materials with large specific capacity and excellent rate performance. Herein, we provide a large-scalable process to create the highly N-doped carbons by employing k-carrageenan as precursor and alkali metal nitrate as activating agent and dopant. Remarkably, the nitrate salt assisted synthesis process leads to a high nitrogen content of 8.6–12.6 at. % in the carbon framework. When applied as an anode for a sodium ion battery, the carbon delivers a high reversible capacity of 419 mA h g–1 at 50 mA g–1. The kinetics analysis manifests that the capacity contribution is mainly from capacitive storage, resulting in an excellent rate performance, e.g., 131 mA h g–1 at 10 A g–1. Benefiting from the rational design of the carbon anode, the optimized sodium ion capacitor exhibits a large energy density of 110.8 W h kg–1 and retains 85% of its initial capacity after 10 000 cycles. This work provides an effective way to fabricate highly N-doped carbons for advanced energy storage devices.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Chong Wang,Gaoyu Chen,Juanrong Kou,Xianju Zhang,Xiangxing Xu,Jianchun Bao,Zihan Shen,Xin Jin,Huigang Zhang,Li Liu,Kehan Yu
Antimony (Sb) is a competitive candidate for lithium ion batteries (LIBs) as anode material because of its high theoretical discharge capacity (660 mAh/g). However, it remains a challenge caused by the volume change in the process of charge and discharge, which would damage the Sb anode that lead to poor rate performance and low cycle stability. Herein, we report the synthesis of Sb@S–N–C nanocomposite as the anode material to solve the problem. First, SbSI nanowires with diameter of ∼10 nm were synthesized. Then the SbSI nanowires were coated with polypyrrole (PPy) to form SbSI@PPy core-shell nanowires. By thermal reduction of SbSI@PPy, Sb@S–N–C nanocomposite was formed. Using the Sb@S–N–C nanocomposite as the anode material, a capacity of 536 mAh/g was obtained in 100 cycles at 0.5 A/g. Excitingly, it also exhibited superior reversible and long-cycle non-decay stability with the capacity of 342 mAh/g in 2000 cycles at a high current density of 1A/g.
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高影响因子
Advanced Materials Interfaces
·
2019
·Vol. 6
·期 9
·1802088
·
IF 4.713
Nianxiang Shi,Baojuan Xi,Zhenyu Feng,Jincheng Liu,Denghu Wei,Jing Liu,Jinkui Feng,Shenglin Xiong
Lithium–sulfur batteries are deemed to be one of the most promising energy storage alternatives due to the high theoretical capacity and cost-effectiveness. The significant challenge in exploring novel sulfur host materials is to simultaneously inhibit the shuttle effect and heighten the reaction kinetics. Herein, a novel hybrid host consisting of W 2 C atomic nanoclusters (NCs) grown on a N/P-codoped graphene framework (W 2 C@N/P-rGO) is designed and fabricated for the first use in lithium–sulfur batteries. By means of first-principle calculations and the kinetics analysis including lithium ion diffusion coefficient and charge transfer resistance, the introduction of W 2 C atomic NCs benefits the enhancement of electrochemical kinetics on a polar hybrid conductor. Furthermore, the intense ability of chemically sequestrating the soluble polysulfides by W 2 C atomic NCs ensures the high utilization of sulfur, making the high capacity retention. With a high sulfur loading of 3.1 mg cm −2 , the W 2 C@N/P-rGO/sulfur composite cathode indicates a significantly enhanced electrochemical performance. This work may open up a new avenue to design novel host candidates for advanced lithium–sulfur batteries.
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高影响因子
JOURNAL OF RAMAN SPECTROSCOPY
·
2016
·Vol. 48
·期 2
·243-250
·
IF 2.395
Lin Wang,Yan Zhang,Wenqi Zhang,Tianrui Ren,Feng Wang,Haifeng Yang
Silver nanoparticle (AgNP)/poly( N -isopropylacrylamide) (PNIPAAm) composite solution was electrospun followed by crosslinking to fabricate AgNP/PNIPAAm composite nanofiber mats. Embedded AgNPs were found to align along the PNIPAAm nanofibers, which generate more hotspots upon laser-induced plasmonic heating. This kind of AgNP/PNIPAAm mats show enhanced surface-enhanced Raman scattering (SERS) effect upon continuous pulsed laser irradiation, showing a ‘laser heating sensitive’ SERS effect. Laser-induced plasmonic heating can also tune the temperature-responsive interaction between PNIPAAm and analytes and has been applied in the on-site ‘laser heating sensitive’ separation and SERS detection of analytes. The composite nanofiber mats also showed good reproducibility and stability. What is more, this ‘laser heating sensitivity’ has also been applied in the direct SERS detection of adenosine in urea solution without urea interference. Together with the advantages of ease of large-scale fabrication, stable and ‘laser heating sensitivity’, AgNP/PNIPAAm mats might find application in sensitive multicomponent biosensing. Copyright © 2016 John Wiley & Sons, Ltd.
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Advanced Materials Interfaces
·
2022
·Vol. 9
·期 9
·2102193
·
IF 6.389
Pengcheng Wang,Changlai Wang,Yang Yang,Shi Chen,Zhiyu Cheng,Minxue Huang,Huigang Tong,Qianwang Chen
Highly active and low-cost anodic hydrogen oxidation reaction (HOR) catalysts play a significant role in the large-scale application of anion exchange membrane fuel cells (AEMFCs). Herein, a novel anodic HOR electrocatalyst with RuP nanoparticles loaded on N, O codoped porous hollow carbon (RuP/NOC) is prepared. The catalyst exhibits high catalytic activity toward HOR, achieving a kinetic mass activity of 3.25 mA µg –1 PGM at 50 mV, 13 times higher than that of Ru/NOC and even superior to that of Pt/C. Density functional theory (DFT) calculations demonstrate that the transfer of electrons from ruthenium to phosphorus shifts down the d-band center of Ru, weakening the hydroxyl binding energy and decreasing the reaction energy barrier for HOR, thus enhancing the catalytic activity of Ru.
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高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Zewei Jia,Shangbo Ning,Yuxin Tong,Xin Chen,Huilin Hu,Lequan Liu,Jinhua Ye,Defa Wang
Photothermal reverse water gas shift reaction is one of the promising methods to palliate global energy and environmental issues. Searching for catalysts with high activity and CO selectivity for CO2 conversion has been attracting extensive attention. In this work, Ni nanoparticle-loaded N-doped CeO2 (Ni/N-CeO2) composite catalysts were synthesized using a three-step method. Under light irradiation, the optimal Ni/N5.0-CeO2 exhibited a CO yield rate of 20.9 mmol·gcat–1·h–1 with almost 100% of CO selectivity via photothermal CO2 reduction. As a comparison, Ni/CeO2, without nitrogen doping, showed a high CH4 selectivity. The strong light absorption of Ni/N5.0-CeO2 mainly by loading of Ni nanoparticles and the enhanced adsorption/activation of CO2 molecules due to increased oxygen vacancies in N5.0-CeO2 by N-doping were supposed to account for the excellent catalytic performances. The doping of nitrogen was of particular importance for the formation of N–H bonds, which could modulate the reaction pathway for promoting the reduction of CO2 toward CO while suppressing the undesirable CO2 methanation process.
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高影响因子
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