OPTICAL MATERIALS
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2020
·
IF 2.779
Shuting Zhang,Guoqiang Li,Liyuan Duan,Hongyu Wang,Yongle Zhao,Yongfa Zhang
The desulfurized waste liquid (DWL) produced in the process of wet oxidation removal of hydrogen sulfide (H 2 S) and hydrogen cyanide (HCN) from coke oven gas is rich in ammonium thiocyanate (NH 4 SCN), ammonium thiosulfate ((NH 4 ) 2 S 2 O 3 ), and ammonium sulfate ((NH) 2 SO 4 ). Based on the research of thermal decomposition of DWL, the study on the preparation of graphitic carbon nitride (g-C 3 N 4 ) by thermal polymerization in hydrogen (H 2 ) atmosphere using the salts of DWL as precursor was carried out. Specifically, a single salt (NH 4 SCN), a double salt combination (NH 4 SCN + (NH) 2 SO 4 ) or (NH 4 SCN + (NH 4 ) 2 S 2 O 3 ), and a three salt combination (NH 4 SCN + (NH) 2 SO 4 + (NH 4 ) 2 S 2 O 3 ) were used as precursors to prepare g-C 3 N 4 . The morphology, phase composition, specific surface area, pore structure distribution, element composition, element valence distribution, and light absorption characteristics of the prepared samples were characterized. The performance of the prepared samples was evaluated by photocatalytic degradation of rhodamine B under visible light . The characterization results showed that the product (CN-MIX) obtained by the pyrolysis of three salt combination has a most fluffy and porous structure with the maximum specific surface area of 56.89 m 2 /g. Which can be attributed to the template effect of the gases produced by the pyrolysis of (NH 4 ) 2 S 2 O 3 and (NH) 2 SO 4 accompanying the deamination and polycondensation of the intermediate product from the pyrolysis of NH 4 SCN. CN-MIX has a widest band gap of 2.93eV with a more negative conduction band . After 4 h of visible light irradiation, the degradation rates of 300 mL rhodamine B solution (60 mg/L) photocatalyzed by 50 mg mono-salt product and tri-salt product catalyst were 58.27% and 96.49% respectively. This is due to the synergistic effect of the large specific surface area, abundant structural defects and the strong reduction ability of photo-generated electrons in CN-MIX. The great photocatalytic performance of CN-MIX has positive theoretical guiding significance for the preparation of highly active photocatalyst g-C 3 N 4 by using the mixed salt of desulfurized waste liquid.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 16
·8113-8120
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IF 11.301
Jun Zhou,Liwei Yuan,Jingwen Wang,Lingling Song,Yu You,Ru Zhou,Junjun Zhang,Jun Xu
Despite the fulfilling progress in fabricating advanced nickel dichalcogenide catalysts towards an efficient oxygen evolution reaction (OER), previous efforts focused on the pyrite structure. In this work, combinational modulations of metallic NiSe2 nanodendrites by phase engineering and heteroatom doping are achieved to promote the OER. A series of marcasite NiSe2 (m-NiSe2) and Fe-doped marcasite NiSe2 (m-Ni1−xFexSe2) nanodendrites with various dopant contents have been controllably synthesized. On the one hand, phase engineering to synthesize m-NiSe2 nanodendrites offers a better intrinsic electronic conductivity than the pyrite phase. On the other hand, heteroatom Fe doping in m-NiSe2 nanodendrites further gains electronic benefits and simultaneously provides more electrochemical active sites owing to heteroatom displacement defects. Consequently, an optimized catalyst of m-Ni0.94Fe0.06Se2 nanodendrites with a moderate dopant content is developed, exhibiting significantly improved OER performance with a low overpotential of 279 mV at 10 mA cm−2, a small Tafel slope of 39 mV dec−1 and long operational stability for 35 h in 1.0 M KOH. In situ surface oxidation of the m-Ni0.94Fe0.06Se2 nanodendrites to form amorphous Fe-doped NiOOH/Ni(OH)2 shells during the OER process is demonstrated, which contributes to their superior activity and outstanding stability. This work provides valuable insights into the design of advanced OER electrocatalysts by means of combinational modulations of phase engineering and heteroatom incorporation.
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ACS Applied Materials & Interfaces
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2020
·
IF 8.758
Xiang Zhang,Jun Zhou,Yuying Zheng,Dongyang Chen
Coordination compound derivates (CCDs) have been widely applied in lithium-ion batteries (LIBs). However, the functionalization of CCDs with open structure and heteroatomic doping is still challenging. Herein, an effective functionalization strategy is presented to prepare a kind of CCD, where Co0.85Se nanoparticles are encapsulated by nitrogen-enriched hierarchically porous carbon (CS/NPC) based on the heat treatment of a cobalt-complexed hexamethylolmelamine-polyvinylpyrrolidone resin (Co2+/HPR). The abundant free volume and enriched N species of the HPR are responsible for the hierarchically porous configuration and high N-doping of the composites. By controlling the content of cobalt salt and the heating rate, high specific surface area (440.7 m2 g–1), high N-doping (8.54 atom %), and suitable mass loading of Co0.85Se (55.5%) were simultaneously achieved in CS-2/NPC-5, which delivers high reversible capacity (758.5 mAh g–1 at 0.1 A g–1), outstanding rate capability (401.7 mAh g–1 at 5 A g–1), and excellent cycling durability (638.4 mAh g–1 at 1 A g–1 after 200 cycles), suggesting a promising candidate for LIB anode materials.
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PubMed
高影响因子
JOURNAL OF POWER SOURCES
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2020
·
IF 8.247
Yayun Zheng,Yunrui Tian,Shatila Sarwar,Jujie Luo,Xinyu Zhang
This work reports the fabrication of carbon nanotube (CNT) decorated NiSe 2 nanosheets (NiSe 2 @CNT) by a rapid microwave process in 2 min. Interestingly, NiSe 2 @CNT has a lamellar and tubular interwoven morphology. The specific capacitance of the prepared electrodes with different microwave conditions for supercapacitors were studied. Meanwhile, we compared the electrochemical performances of NiSe 2 @CNT with the presence of different amount of CNT. The optimal NiSe 2 @CNT electrode can demonstrate a high specific capacitance of 980.5 F g −1 at a current density of 1 A g −1 and good cycling stability of 82% retention after 9000 cycles at 5 A g −1 . In addition, an asymmetric supercapacitor was assembled by NiSe 2 @CNT as positive electrode and activated carbon (AC) as negative electrode , which successfully light four white light emitting diodes (LEDs) for 6 min with an energy density of 25.61 Wh kg −1 at a power density of 810 W kg −1 .
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高影响因子
ACS Applied Bio Materials
·
2020
·
IF 0
Yuhuan Zhao,Xianwen Wang,Feng Gao,Chenya Wang,Zongjin Yang,Hanfei Wu,Chunyan Li,Liang Cheng,Rui Peng
The spread of antibiotic-resistance poses a great threat, making it a growing need to develop other antibacterial strategies and therapeutics. Recently, owing to their excellent physicochemical properties, copper chalcogenides have received extensive attention as photothermal agents. However, most reports are focused on Cu2–xS nanoparticles, whereas very few water-dispersible Cu2–xSe nanomaterials have been reported due to their difficult preparation process. Herein, water-dispersible and biocompatible cuprous selenide nanosheets (Cu2Se NSs) were synthesized by a simple anion exchange method starting from cuprous oxide nanorods (Cu2O NRs), which could also help avoid any environmental pollution caused by the organic solvent used during synthesis. The obtained Cu2Se NSs showed strong absorption in the second near-infrared window (NIR II) with a good photothermal conversion efficiency as high as ∼61.16%, outstanding among the previously reported NIR II photothermal agents. Interestingly, using Staphylococcus aureus and Escherichia coli as model pathogens, these Cu2Se NSs possess an intrinsic bacteriostatic effect and could inhibit the growth of both bacteria species. Furthermore, both the fluorescent-based microscopy and the bacterial morphology analysis using a scanning electron microscope have demonstrated that incubation of both species of bacteria with Cu2Se NSs under laser irradiation (1064 nm) would lead to complete disruption of the bacterial cell wall. Our work presents a facile method to prepare water-dispersible Cu2Se NSs-, which could serve as highly efficient dual-functional antibacterial agents.
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PubMed
SYNTHETIC METALS
·
2020
·
IF 3.286
Shang Wu,Tao Cui,Qinzheng Hu,Fenping Yin,Qiaoliang Feng,Sheng Zhou,Qiong Su,Lan Wu,Quanlu Yang
Nickel selenide nanoparticles uniformly supported on graphene nanosheets to form NiSe 2 /rGO composites were prepared via one-step mixing solvothermal method. The NiSe 2 /rGO composite possesses a high specific capacity of 137.7 mA h g −1 (1A g −1 ) and displays an excellent rate property. Moreover, there are NiSe 2 /rGO-20 as electrode materials assembling asymmetric supercapacitors, which manifests high energy density (33.13 Wh kg −1 ) at a power density (850 W kg −1 ) and the capacity can maintain of 80 % after 10,000 cycles. Therefore, NiSe 2 /rGO composite can be a potential candidate for high-efficiency asymmetric supercapacitors.
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高影响因子
Advanced Materials Technologies
·
2020
·Vol. 5
·期 7
·2000302
·
IF 5.969
Minghui Du,Yi Dai,Zhen Wang,Shichao Lv,Guanxin Du,Jiaxi Li,Yanqing Qiu,Jianrong Qiu,Shifeng Zhou
X-ray radiation is a leading cause of cancer, and thus a device that offers effective and real-time radiation monitoring is of significant interest. The configuration design, fiber drawing, and device construction are introduced for a multimaterial fiber detector system that allows real-time and remote X-ray monitoring. A fiber detector embedded with metal–semiconductor–insulator ladder-like configuration is designed and successfully constructed on the basis of Plateau–Rayleigh instability. The multimaterial design affords the detector robust radiation-harvesting ability, enabling the collection of up to ≈88.13% of total X-ray energy. The unique ladder-like configuration allows the efficient generation and collection of free charges. Moreover, the detector exhibits excellent mechanical flexibility and can be woven into a complex configuration and even wearable fabrics. Finally, the application of the micro-detector in real-time wireless X-ray monitoring is demonstrated. This research not only presents a flexible radiation detection strategy for various ionizing radiation types, such as X-ray, gamma ray, and neutrons radiation, but also has potential uses in remote radiation monitoring in case a conventional rigid device is inapplicable.
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高影响因子
POLYMER
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2020
·
IF 4.231
Liangjie Shi,Yong Jin,Weining Du,Shuangquan Lai,Yichao Shen,Rong Zhou
Redox-responsive polymeric micelles carriers have been developing rapidly in recent years. Despite great achievements having been made, the acute defects of low drug loading content and drug loading efficiency, weak sensitivity to redox environment of tumor tissue, limited stability in the circulation fluids and less programmable release hinder their further applications. In this work, a sort of diselenide-containing nonionic gemini polymeric micelles carriers (PEG-Gn, n = 8, 12, 16) was synthesized. The resultant micelles of PEG-G12 have a small average size (less than 100 nm), high drug loading efficiency (77%) and acceptable drug loading content (7.1%), which may be attributed to their gemini structure with a lower critical micelle concentration and a larger average minimum area per polymer molecules of micelles. In addition, PEG-G12 can smartly judge the redox environment to release the loaded drugs. In vitro release experiments showed that the indometacin-loaded polymeric micelles could hold the drugs in the circulation fluids in 0.02 mM 1,4-dithiothreitol (only 27% release in 24 h) and release the drugs rapidly and sufficiently in 10 mM 1,4-dithiothreitol (82% in 24 h). More interestingly, these indometacin-loaded micelles could first respond to the reactive oxygen species and then to the 1,4-dithiothreithol, achieving a programmable release of indometacin. We expect that this work could provide a versatile platform for the next generation of redox-responsive polymeric micelles carriers with better comprehensive performances.
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高影响因子
Journal of Nanomaterials
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2020
·
IF 1.98
Shibing Zou,Feng Li
Highly efficient all-inorganic perovskite solar cells require a fast charge transfer from CsPbBr3 to TiO2 to reduce the recombination from trap states. Herein, we insert a CdS/CdSe/CdS quantum dot (QD) layer between the TiO2 and CsPbBr3 layers to fabricate all-inorganic perovskite solar cells. By tuning the thicknesses of the CdSe layer of CdS/CdSe/CdS QDs, the conduction band (CB) levels can be adjusted to -3.72~-3.87 eV. After inserting the QD intermediate layer, the energy offset between the CB of TiO2 and CsPbBr3 is reduced, thus leading to a charge transfer rate boost from to . The power conversion efficiency (PCE) of the solar cell with QD intermediate layer achieves 8.64%, which is 20% higher than its counterpart without QDs.
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高影响因子
GREEN CHEMISTRY
·
2020
·Vol. 22
·期 11
·3597-3607
·
IF 9.48
Hai-Qin Xiao,Wen-Hui Zhou,Dong-Xing Kou,Zheng-Ji Zhou,Yue-Na Meng,Ya-Fang Qi,Sheng-Jie Yuan,Qing-Wen Tian,Si-Xin Wu
Cu2ZnSn(S,Se)4 (CZTSSe) solar cells have been receiving considerable attention in recent years, owing to their low cost and toxicity as well as a high abundance of their constituent elements. Solution-based (mainly precursor solution) methods have been widely used in the fabrication of CZTSSe-based thin film solar cells. Though most record solar cells since 2009 have been achieved using solution-based methods, carbonaceous residues are always formed during post deposition treatment (PDT). These carbonaceous residues are detrimental to grain growth of CZTSSe to form large grains. The presence of unwanted small grain layers will increase the series resistance and reduce the fill factor of the solar cell, thus consequently decreasing the efficiency of CZTSSe solar cells. Herein, we propose “green” supercritical carbon dioxide (SCCO2) treatment to overcome the challenge of carbonaceous residues. FT-IR, SEM, XRD and Raman characterization studies were used to confirm the reduction of carbonaceous residues in CZTSSe films. The solar cell fabricated from a selenized CZTSSe precursor film with SCCO2 treatment under optimal conditions showed the best conversion efficiency of 11.23% (VOC = 0.456 V, JSC = 36.6 mA cm−2, FF = 67.1%). To the best of our knowledge, this is the first report on boosting the efficiency of solution-based CZTSSe solar cells by using SCCO2 treatment. In addition, this unique SCCO2 treatment may also bring forth new ideas for other solution-based optoelectronic devices.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Hengyang Wang,Xiaofang Liu,Bin Zhang,Lisi Huang,Meiling Yang,Xiang Zhang,Hong Zhang,Guoyu Wang,Xiaoyuan Zhou,Guang Han
Binary silver chalcogenides (Ag 2 X, X = S, Se, Te) are a group of intriguing thermoelectric materials. When utilised for thermoelectrics, however, the syntheses of these chalcogenides commonly require energy-intensive, high-temperature melting-annealing processes. Herein, we have developed a general surfactant-free and scalable solution synthesis strategy to nano/micro-particles of binary silver chalcogenides, which requires neither high temperature nor long reaction duration. The chalcogenide particles were spark plasma sintered into pellets with porous structures. By modifying the Ag + /X 2− molar ratios in the solution precursors from 2:1 to 2:1.1, the thermoelectric properties of the pellets have been effectively optimised, leading to maximum ZT values of 0.84 at 380 K for Ag 2 Se, 0.59 at 650 K for Ag 2 Te and 0.27 at 540 K for Ag 2 S that are comparable to those of samples fabricated by other synthetic methods, such as melting and annealing. This study provides a general surfactant-free solution approach to binary silver chalcogenide nano/micro-materials with tuneable thermoelectric properties.
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高影响因子
NANO
·
2020
·
IF 1.566
Jieqiong Wang,Jie Yang,Jian Fang,Yuhang Li,Hongyuan Zhang,Zhenbo Zhao,Yuhui Ao
The WSe 2 /g-C 3 N 4 (graphite carbon nitride) composite with photocatalytic properties was synthesized using a hydrothermal method. This synthesis pathway can be characterized by being simple, inexpensive and nonpolluting, integrating the concept of green chemistry. The WSe 2 /g-C 3 N 4 composite could effectively degrade methyl orange solution under visible light irradiation. The decolorization experiment of methyl orange solution shows that the degradation rate of the 30 wt.% WSe 2 /g-C 3 N 4 composite can reach 98.7% after 100 min of illumination, while the degradation rate of pure g-C 3 N 4 was only 87.6% under the same conditions. This can be attributed to the fact that the combination of WSe 2 and g-C 3 N 4 nanosheets can increase the number of active binding sites, increasing the rate of charge separation and transport ability, decreasing the recombination rate of the photogenerated electron–hole pairs. Therefore, the WSe 2 /g-C 3 N 4 composite will have potential development as a new material with low cost, easy synthesis and excellent performance in photocatalytic degradation of water pollution.
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高影响因子
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