Nano Energy
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2020
·
IF 16.602
Yi Liu,Qingguo Feng,Wei Liu,Qian Li,Yuchao Wang,Biao Liu,Lirong Zheng,Wei Wang,Lin Huang,Limiao Chen,Xiang Xiong,Yongpeng Lei
For electrocatalytic hydrogen evolution reaction (HER) in alkaline media , it is urgently needed to accelerate the generation of H*. Here, using Se doped phosphides inside nitrogen doped carbon (skin-core structure) as catalysts, the HER performance in alkaline electrolyte was improved. The overpotential of 261 mV at 400 mA cm −2 was among the top level reported so far. Based on the combination of experimental results and density functional theory (DFT) calculations, the interior CoSe phase generated by Se modification provides faster charge transfer from the inner to carbon layer , facilitating the rate-determining step (Volmer). Also, the needle-like nanowire array facilitates the H 2 desorption at a large current density. Furthermore, a solar-to-hydrogen efficiency up to 10.2% was demonstrated. This work may provide an effective strategy to boost the reaction kinetics via accelerating interfacial charge transfer ability of electrocatalysts .
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高影响因子
Nanoscale
·
2020
·Vol. 12
·期 39
·20536-20542
·
IF 6.895
Jie Chen,Taoyi Liu,Deyu Bao,Bin Zhang,Guang Han,Can Liu,Jun Tang,Dali Zhou,Lei Yang,Zhi-Gang Chen
Searching for new-type, eco-friendly, and Earth-abundant thermoelectric materials, which can be used as an alternative to the high-cost bismuth telluride, is important for near-room-temperature applications. In this work, nanostructured monoclinic Cu2Se with a low carrier concentration has been synthesized by a wet mechanical alloying process combined with spark plasma sintering. Such a low carrier concentration, which originates from the effectively suppressed Cu deficiencies during the fabrication process, induces a relatively low electrical conductivity and carrier thermal conductivity. Besides, the nanostructured grains combined with point defects and phonon resonance enhance the phonon scattering to induce a low lattice thermal conductivity without sacrificing the electrical transport properties. As a result, our nanostructured monoclinic Cu2Se obtains a figure of merit of 0.72 at 380 K with good thermal stability. This work indicates that nanostructured monoclinic Cu2Se is a promising near-room-temperature thermoelectric material.
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高影响因子
ACS Applied Materials & Interfaces
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2020
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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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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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ACS Applied Bio Materials
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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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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Baodeng Yang,Jiao Yang,Zhi Huang,Lizhao Qin,Hua Lin,Qing Li
Thin Cu 2 Se hexagonal sheets (HSs) with large-size were obtained via a convenient green route by using Ascorbic acid (AC) as a reducing agent and β-CD as a surfactant. The crystal structure and optical properties of the Cu 2 Se HSs were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectrometer (XPS) and ultraviolet–visible spectrophotometer (UV–Vis). An NTH (Nucleation-Triangle-Hexagonal) mechanism for the formation of the Cu 2 Se hexagonal sheets was proposed. The final morphology of the Cu 2 Se HSs was determined by both β-CD and the growth rates of different crystal planes. The as-prepared Cu 2 Se HSs show good photocatalytic performance on degrading of Methylene blue (MB) under visible light.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2020
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IF 6.155
Jinming Hu,Shengyi Yang,Zhenheng Zhang,Hailong Li,Chandrasekar Perumal Veeramalai,Muhammad Sulaman,Muhammad Imran Saleem,Yi Tang,Yurong Jiang,Libin Tang,Bingsuo Zou
Due to their promising applications in foldable displays, optical communication equipment and environmental monitoring systems, flexible and broadband optoelectronic devices have gained extensive attention in recent years. Here, a flexible and broadband photodetector based on CsPbBr 3 /PbSe quantum dot (QD) heterostructures is firstly presented. The integrated QD heterostructures possess consecutive detection range from ultraviolet (UV) to long-wavelength infrared (LW-IR) regions with efficient light absorption and chemical stability, in comparison with the pristine PbSe QDs. Systematic material characterizations reveal the improved exciton dissociation, carrier transport and carrier lifetime of the QD heterostructures. Flexible photodetector Ag/CsPbBr 3 /PbSe/Ag demonstrate a high responsivity of 7.17 A/W with a specific detectivity of 8.97 × 10 12 Jones under 25 μW/cm 2 365 nm illumination at 5 V. Furthermore, it could maintain 91.2 % (or 94.9 %) of its initial performance even after bending for thousands of times (or exposing in ambient air for 4 weeks). More importantly, its response time is shortened more than three orders of magnitude as that of pristine PbSe QDs-based photodetectors. Therefore, it provides a feasible and promising method for the next-generation high-performance broadband photodetectors via constructing heterostructures of various QDs.
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JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
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2020
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IF 2.69
Qianqian Qi,Xianwu Zeng,Licong Peng,Hailiang Zhang,Miao Zhou,Jingping Fu,Jianchao Yuan
Herein, we construct a charge - switchable polymer nano micelles poly (2-(hexamethyl eneimino) ethyl methacrylate) - b - poly (ethylene glycol) monomethyl ether methacrylate) - b - poly (diethyl enetriaminepentaacetic acid methacrylate) - b - poly (1-vinyl imidazole) - b - poly (4-vinyl phenylboronic acid) (PC7A-PEG-DTPA-VI-PBA) in different pH solutions. DOX released faster from micelles in a weakly acidic environment (pH 5.0) than at pH 7.4. In order to enhance the anti-tumor effect, the imidazole functional groups in the polymer were used to coordinate CdSeTe quantum dots (QDs) for photodynamic treatment (PDT). In addition, the surfaces of the micelles were further decorated with phenylboronic acidas a targeting group, using DTPA chelating 99mTc for SPECT imaging.It has been successfully demonstrated that the nanoparticles have a good cumulative effect on the tumor site.The structure of the polymer was characterized by 1HNMR. The morphology and particle size of the micelles were characterized by transmission electron microscopy (TEM) and dynamic light scattering (DLS). The drug loading capacity (DLC) and drug loading efficiency (DLE) of the micelles were analyzed by ultraviolet visible spectroscopy. And the pH-sensitive drug release and cytotoxicity of the micelles were verified in vitro. In vitro experiments showed that the nano micelles were noncytotoxic to different cell lines, while DOX@CdSeTe@PC7A-PEG-DTPA-VI-PBA inhibited the proliferation and promoted the apoptosis of B16F10 cells. An in vivo study with C57BL tumor-bearing mice indicated that DOX@CdSeTe@PC7A-PEG-DTPA-VI-PBA nano micelles efficiently inhibited tumor growth. Results showed that the nano micelles had good pH responsibility and biocompatibility, and the loaded DOX could be released in the weak acidic environment of tumor cells, and it was expected to be a good drug delivery system.
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高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 19
·6358-6363
·
IF 7.059
Rui Cheng,Kangzhe Ma,Hong-Gang Ye,Luting Ling,Guan Wu,Cai-Feng Wang,Su Chen
Quantum dots (QDs) have gained extensive attention owing to their outstanding photoelectric properties. However, the fast and continuous synthesis of QDs remains a challenge. Herein, for the first time, we develop a magnetothermal microfluidic technique (MMT) to rapidly synthesize CdSe and CdSe@ZnS QDs with higher optical performance and continuous production. The as-prepared CdSe@ZnS QDs exhibit relatively high photoluminescence quantum yields (PL QYs) (∼70%). Meanwhile, by manipulating the fluid rate and reaction temperature of the MMT, the emission wavelengths can be tuned in the visible region from 515 to 625 nm. Furthermore, the red emissive CdSe@ZnS QDs are used as fluorescent conversion materials in a backlight display, which shows a wide color gamut around 112%. Our purpose is to highlight a new powerful platform of the MMT for rapid, accurate, and continuous fabrication of photoluminescent nanomaterials, which will guide the substantial progress of backlight displays and light emitting diodes (LEDs).
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高影响因子
OPTICAL MATERIALS
·
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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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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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 16
·8113-8120
·
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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