CHEMICAL ENGINEERING SCIENCE
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2020
·
IF 3.871
Jingchao Wang,Tianyong Zhang,Shuang Jiang,Xiaoyuan Ma,Xiao Shao,Yiwei Liu,Di Wang,Xianggao Li,Bin Li
The electrostatic induced self-assembly method is successfully applied to prepare core-shell hierarchical structure of BiOI/OMCMB (Oxidized mesocarbon microbead) composites (MB), in which BiOI nanosheets were uniformly immobilized on the surface of OMCMB. The low-priced graphite carbon OMCMB played a crucial role in inducing and assembling the core-shell structure of the MB composites, which not only effectively improved the conductivity of the catalyst but also enhanced the stability of BiOI in the catalytic process. The photocatalytic degradation of tetracycline hydrochloride (TH) revealed that the hierarchical structure of OMCMB and BiOI promoted the photogenerated charge separation, and enhanced the photocatalytic performance of BiOI. And sample MB-3 had the highest photocatalytic performance with TH degradation of 96.8% under the visible-light irradiation for 60 min. MB-3 remains favorable photocatalytic activity after four cycles. Moreover, based on the related optical and electrical characterization analysis, a possible photocatalytic mechanism about MB composites was proposed tentatively.
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NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 10
·4199-4205
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IF 3.288
Won-Chun Oh,Yin Liu,Kwang Youn Cho,Chong-Hun Jung,Yonrapach Areerob
A novel graphene-Ba2Cu8Ni2Se12 catalyst with CoS nanospheres (GBC) was synthesized via a facile hydrothermal method for use as a counter electrode (CE) in dye-sensitized solar cells (DSSCs). In this work, Ba2Cu8Ni2Se12 (BCNS) and CoS nanospheres were directly grown on graphene sheets showing strong interactions. The morphology and electrochemical and photovoltaic performances of GBC were studied. The GBC CE in bifacial DSSCs showed higher power conversion efficiency (12.37%), which is comparable to that of a traditional Pt electrode (4.07%). This result shown that the synergistic effects of the GBC structure provides a large catalytic active area and an excellent electron transfer pathway. The GBC CE exhibits good device performance and can serve as a low-cost CE as compared to Pt in the DSSCs.
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MICROCHEMICAL JOURNAL
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2020
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IF 3.594
Yiju Song,Kaihang Cao,Wenjun Li,Chaoyun Ma,Xiuwen Qiao,Hongling Li,Chenglin Hong
A three-dimensional array of reduced graphene oxide/MoS 2 @ polyaniline-layered nanosheets (denoted as rGO/MoS 2 @ PANI) has a novel structure of intercalated MoS 2 /PANI nanosheets arrays arranged on rGO that can be used as carcinoembryonic antigen (CEA) electrochemical immunosensors (detectors). In this graded nanosheet, the PANI was embedded in the MoS 2 interlayer. The MoS 2 /PANI nanosheets themselves limit volumetric changes when arranged as MoS 2 /PANI nanosheet arrays on rGO nanosheets to provide tight and sufficient heterogeneity. PANI locates on the interface itself and contains a large amount of –NH 2 that can bind many antibodies. Simultaneously, we investigated the optimal amount of aniline to add. We found that these arrays had excellent film thickness and conductivity for improving CEA detection sensitivity. The tested immunosensor achieved sensitive and specific detection of CEA, with a detection limit of 0.3 pg mL −1 . Under the optimal conditions, the prepared immunosensor exhibited acceptable reproducibility and selectivity and excellent stability. Satisfactory results of human serum samples indicated the potential application of the immunosensor for clinical monitoring of tumor markers.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Wenhu Yang,Hao Guo,Liguo Yue,Qi Li,Mengni Xu,Longwen Zhang,Tian Fan,Wu Yang
In this present paper, a novel layered multi-metal sulphide was reported as a positive electrode material with abundant electroactive sites and redox reaction centres. Molybdenum and sulfur elements were introduced into the metal-organic frameworks (M-MOF: M = Ni, Co and Ni/Co) to synthesize layered MMoS x by a hydrothermal method . The electrochemical performance comparison of MOFs and six electrode materials demonstrated that NiCoMoS x electrode materials had the best electrochemical performance and the highest specific capacitance. The highest specific capacitance could reach 2595 F g −1 at a current density of 1 A g −1 . The NiCoMoS x electrode material also had an excellent cycle stability with a retention rate of 90.8% after 10,000 charge and discharge cycles. In addition, the as-assembled NiCoMoS x //AC assymmetric supercapacitor (ASC) device exhibited a maximum energy density of 48.2 Wh·kg −1 at a power density of 807.2 W kg −1 , and the capacity retention rate after 10,000 charge and discharge cycles was 91.6%. This electrochemical performance indicated that this kind of material had a good market development prospect.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Ya Su,Zhigang Xie,Min Zheng
Carbon dots (CDs) with concentration-modulated luminescence were obtained by pyrolysis of citric acid (CA) and thiourea (TU). CDs exhibit multi-colored emission by varying their concentrations. As a contrast, Zr-doped CDs (ZrCDs) were prepared from CA, TU and ZrCl 4 in a similar way. To our surprise, no concentration-dependent emission were observed in ZrCDs. Structural and optical characterizations prove that the concentration-tunable fluorescence is attributed to the aggregation between CDs. As the concentration increases, the aggregation of CDs results in a gradual decrease in the band gaps (from 2.18 eV to 1.56 eV), which ultimately causes the fluorescence to redshift continuously. However, ZrCDs are always in a highly dispersed state no matter how the concentration goes up, the zirconium complexes on the surface of ZrCDs prevents them from aggregation and maintains the band gap of ZrCDs at about 2.21 eV. Therefore, we proposed an aggregation-induced multicolor emission mechanism for CDs, which has a certain reference significance for exploiting the potential applications of CDs.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Yongkun Liu,Guohua Jiang,Bo Yu,Uwamahoro Evariste,Pianpian Ma
Herein, the phosphorus-substituted nickel cobalt sulfides nanosheet arrays growth on nitrogen doped carbonic nanofibers (donated as Ni–Co–S–P) are prepared by an electrodeposition method. The morphologies and chemical composition of Ni–Co–S–P are investigated by SEM, TEM, XPS and EDS . The electrochemical properties of Ni–Co–S–P are tested by CV , GCD and EIS technologies. And the sample Ni–Co–S–P-4 displays the most outstanding electrochemical properties including electrocatalytic activity, rate capability and specific capacitance. In addition, the iron oxide nanosheets growth on N-CNFs (Fe–O/N-CNFs) are prepared by the same electrodepositing route. And they can serve as a negative electrode according to the electrochemical performances analysis. A hybrid supercapacitor based on the obtained electrodes is further assembled by using Fe–O/N-CNFs as negative electrode and Ni–Co–S–P as positive electrode. The as-fabricated hybrid supercapacitor show outstanding energy storage performance, it possesses a high energy density at 55.8 Wh·kg −1 corresponding to a power density at 402.9 W kg −1 .
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APPLIED SURFACE SCIENCE
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2020
·
IF 6.182
Rui Wang,Erqi Yang,Xiaosi Qi,Ren Xie,Shuijie Qin,Chaoyong Deng,Wei Zhong
It is well recognized that advanced microwave absorbers (MAs) with the characteristics of light weight, good stability, strong absorption, thin thickness and wide absorption bandwidth are highly desirable. In this study, we reported a simple hydrothermal route to synthesize core@shell structure CNTs@MoS 2 nanocomposites (NCs), which were designed as novel and outstanding MAs. By controlling the amounts of initial Mo and S sources, different MoS 2 contents of CNTs@MoS 2 NCs were selectively produced. The results showed that the as-prepared CNTs@MoS 2 NCs displayed the excellent microwave absorption properties (MAPs) owing to their synergetic effect and unique nanoflower morphology of MoS 2 , and their comprehensive MAPs could be improved significantly by optimizing the MoS 2 contents and the filler loading. Impressively, when the filler loading is 40 wt%, the as-prepared CNTs@MoS 2 sample could simultaneously displayed the minimal reflection loss value of −54.75 dB with the very thin matching thickness of 1.49 mm, and effective absorption bandwidth (~4.0 GHz) at the low thicknesses of 1.26 mm. Taking into account of low cost and high stability, one could find that the designed CNTs@MoS 2 displayed very extraordinary comprehensive MAPs, which provided a reliable strategy to design high-performance MAs.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Xinzhu Wen
It is crucial for the storage and conversion of hydrogen energy to substitute the low theoretical potential of urea oxidation reaction (UOR) for the high theoretical potential of anodic water electrolysis (oxygen evolution reaction (OER)). In this paper, it puts forward a brief and scalable strategy, so as to synthesize a novel bifunctional nickel-iron layered double hydroxide and multi-walled carbon nanotube composites supported on Ni foam, represented as NiFe-LDH/MWCNTs/NF. Electrochemical measurements demonstrate that NiFe-LDH/MWCNTs/NF is able to realize an efficient electrocatalysis for UOR. During this process, merely a potential of 1.335 V is needed at 10 mA cm −2 , which can be taken to replace OER, thus reducing overpotential in H 2 -production as well as power consumption . In addition, NiFe-LDH/MWCNTs/NF also exhibits electro-defense electrocatalytic efficiency to achieve the reaction of hydrogen evolving process, which provides a low overpotential of 98 mV at 10 mA cm −2 . To further prove it, all-water-urea electrolysis measurement is carried out in 1 M KOH and 0.5 M Urea with NiFe-LDH/MWCNTs/NF as cathode and anode respectively. NiFe-LDH/MWCNTs/NF||NiFe-LDH/MWCNTs/NF electrode manages to provide 10 mA cm −2 at a voltage of merely 1.507 V, 156 mV lower than that of water splitting, which proves its commercial viability in energy-saving hydrogen production .
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Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 20
·6861-6868
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IF 7.059
Peili Zhao,Yaofei Chen,Yu Chen,Shiqi Hu,Hui Chen,Wei Xiao,Guishi Liu,Yong Tang,Jifu Shi,Zhendan He,Yunhan Luo,Zhe Chen
Biosensors based on surface plasmon resonance (SPR) have shown significant applications in drug screening, environmental monitoring, immunoassay, etc.; however, improving the sensitivity of these biosensors is one of the prime tasks at present. In this study, taking advantage of the special optical and morphological characteristics of MoS2 nanoflowers, we synthesized a sensitivity-improved SPR biosensor by successively depositing MoS2 nanoflowers and gold nanoparticles (AuNPs) on a traditional SPR sensor and then applied this biosensor to the immunoassay of mouse IgG. It was found that the deposition of the MoS2 nanoflowers could improve the bulk refractive index sensitivity from 2212.2 to 2857.2 nm per RIU (RIU: refractive index unit); however, the further addition of AuNPs resulted in a decrease in the bulk refractive index sensitivity to 2149.7 nm per RIU. Moreover, when the proposed biosensor was applied to the IgG immunoassay, a 0.047 nm (μg mL−1)−1 sensitivity of the MoS2–AuNP-modified sensor was achieved, which was ∼3 times that of the unmodified sensor (0.016 nm (μg mL−1)−1). This improvement in the sensitivity of the biosensor towards IgG can be attributed to the flower-like morphology of MoS2 that provides more sites for the loading of AuNPs, thus facilitating the immobilization of a larger amount of IgG antibody on the surface of the sensor. Because of its simple fabrication process and compatibility with the standard bio-activation method of gold surface, the proposed biosensor provides an easily-accessible platform for biological analysis and detection with improved sensitivity.
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Nanomaterials
·
2020
·Vol. 10
·期 4
·631
·
IF 4.324
Zhen Li,Libo Yu,Hao Wang,Huiwen Yang,Huan Ma
Light harvesting and electron recombination are essential factors that influence photovoltaic performance of quantum dots sensitized solar cells (QDSSCs). ZnO hollow microspheres (HMS) as architectures in QDSSCs are beneficial in improving light scattering, facilitating the enhancement of light harvesting efficiency. However, this advantage is greatly weakened by defects located at the surface of ZnO HMS. Therefore, we prepared a composite hollow microsphere structure consisting of ZnO HMS coated by TiO2layer that is obtained by immersing ZnO HMS architectures in TiCl4aqueous solution. This TiO2-passivated ZnO HMS architecture is designed to yield good light harvesting, reduced charge recombination, and longer electron lifetime. As a result, the power conversion efficiency (PCE) of QDSSC reaches to 3.16% with an optimal thickness of TiO2passivation layer, which is much higher when compared to 1.54% for QDSSC based on bare ZnO HMS.Keywords:TiO2passivation layer;ZnO hollow microspheres;quantum dots sensitized solar cells
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INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 44
·期 6
·4827-4836
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IF 3.741
Mojie Sun,Zhao Wang,Bixue Gao,Shijie Wang,Chi Wang,Xiaochen Song,Dongyao Lin
Summary To circumvent the expensive cost of precious metal electrocatalysts, a hydrothermal method and a plasma-enhanced chemical vapor deposition (PECVD) method have been used to prepareNiS 2 -Ni(OH) 2 /NF-PECVD (N-PECVD) with excellent properties. After XRD, SEM, XPS, and other characterization methods, it can be seen that after the hydrothermal reaction of Ni foam (NF), 50-60 nm Ni(OH) 2 nanosheets have grown on the NF frame. The subsequent PECVD reaction produces 90 nm NiS 2 -Ni(OH) 2 nanosheets on the NF frame. The hydrogen release overpotentials in the acidic solution and alkaline solution are 90 and 95 mV ( j = 10 mA/cm 2 ), respectively. And the Tafel slopes reach 80 and 83.6 mV/dec, respectively. The chronopotential (CP) test shows that the material has good HER stability over 12 h. The results from the subsequent electric double layer capacitance and alternating current impedance (EIS) tests show that N-PECVD synthesized by PECVD has a relatively large active electrochemical surface area (ECSA) and a low electrochemical impedance. This study not only finds good inspiration for the synthesis of cheap HER catalysts but also provides a valuable reference for the synthesis of materials in other fields.
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ACS Applied Materials & Interfaces
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2020
·
IF 8.758
Benteng Sun,Zhangqian Liang,Yeye Qian,Xuesong Xu,Ye Han,Jian Tian
Here, we reported that sulfur vacancy-rich O-doped 1T-MoS2 nanosheets (denoted as SV-1T-MoS2) can surpass the activity of Pt as cocatalysts to assist in the photocatalytic nitrogen fixation of CdS nanorods. SV-1T-MoS2 cocatalysts exhibit sulfur vacancies, O-doping, more metallic 1T phase, and high electronic conductivity, thus leading to the exposure of more active edge sites, high Brunauer–Emmett–Teller surface area, enhanced visible light absorption, and improved electron separation and transfer, which are beneficial for photocatalytic nitrogen fixation. Consequently, the optimized 30 wt % SV-1T-MoS2-/CdS composites exhibit an outstanding nitrogen fixation rate of 8220.83 μmol L–1 h–1 g–1 and long-term stability under simulated solar light irradiation, significantly higher than pure CdS nanorods, CdS–Pt (0.1 wt %), and 30 wt % 1T-MoS2/CdS composites. The catalytic mechanism of photocatalytic nitrogen fixation on SV-1T-MoS2 is discussed by density functional theory calculations.
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