CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Xing-hai Zhou,Kun-mei Su,Wei-min Kang,Bo-wen Cheng,Zhen-huan Li,Zheng Jiang
An innovative structure of metal sulfide nanoparticles locked in interconnected porous carbon nanofiber with protective macro-porous skin (M x S y @MPCNF) is successfully prepared by electro-blowing spinning technique and subsequent one-step sulfurization/carbonization process. The obtained film is directly used as freestanding anodes for lithium ion batteries (LIBs), which provides a three-dimensional (3D) crosslinked conductive network and ensures the fast penetration of electrolyte. Meanwhile, the interconnected porous structure of fibers provides enough active sites for Li + storage and shortens the pathways for Li + transport. Moreover, the protective skin with macro-porous structure endows a fast access pathway for electrolyte and prevents the active nanoparticles from shedding. Most importantly, the metal sulfide nanoparticles are locked in a carbon cage which immobilized by the interconnected porous structure, and strongly bridged to the fiber skeleton through a carbon coating layer. Such a well-designed structure offers enough space for volume change and makes the metal sulfide nanoparticles difficult to detach from the carbon nanofiber support. Benefiting from the above advantages, the optimized freestanding Fe 7 S 8 @MPCNF -15 anodes deliver a high reversible capacity of 776 mAh g −1 at 0.2 A g −1 after 200 cycles, and exhibits an excellent cycling stability after 500 cycles with 86% capacity retention at a high current density of 1 A g −1 . Extraordinarily, the synthetic method is very versatile and can be easily extended to fabricate Co 9 S 8 @MPCNF and Ni 9 S 8 @MPCNF composites with excellent electrochemical performances, which will shed some lights on the development of flexible anodes for various energy conversion and storage systems.
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Nano Energy
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2020
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IF 16.602
Guang-Xing Liang,Yan-Di Luo,Shuo Chen,Rong Tang,Zhuang-Hao Zheng,Xue-Jin Li,Xin-Sheng Liu,Yi-Ke Liu,Ying-Fen Li,Xing-Ye Chen,Zheng-Hua Su,Xiang-Hua Zhang,Hong-Li Ma,Ping Fan
Antimony selenide (Sb 2 Se 3 ) is a potential absorber material for environment-friendly and cost-efficient photovoltaics and has achieved considerable progress in recent years. However, the severe open-circuit voltage ( V oc ) deficit ascribed to the interface and/or bulk defect states has become the main obstacle for further efficiency improvement. In this work, Sb 2 Se 3 absorber layer was prepared by an effective combination reaction involving sputtered and selenized Sb precursor thin films . The self-assembled growth of Sb 2 Se 3 thin films with large crystal grains, benign preferential orientation, and accurate chemical composition were successfully fulfilled under an appropriate thickness of Sb precursor and an optimized selenization scenario. Substrate structured Sb 2 Se 3 thin-film solar cells, a champion device with a power-conversion efficiency of 6.84%, were fabricated. This device is comparable to state-of-the-art ones and represents the highest efficiency of sputtered Sb 2 Se 3 solar cells. Importantly, the high V oc of 504 mV is closely related to the reduced deep level defect density for the Sb 2 Se 3 absorber layer, the passivated interfacial defects for Sb 2 Se 3 /CdS heterojunction interface, and the additional heterojunction heat treatment-induced Cd and S inter-diffusion. This significantly improved V oc demonstrates remarkable potential to broaden its scope of applications for Sb 2 Se 3 solar cells.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
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IF 16.683
Qingling Tian,Fan Xiao,Hongying Zhao,Xianbin Fei,Xuqian Shen,Georgeta Postole,Guohua Zhao
The regeneration of surface Fe II and the electro-formation of H 2 O 2 play crucial roles for determining the degradation efficiency of heterogeneous electro-Fenton process. The sulfide iron-based carbon aerogel was synthesized directly as cathode. The main composition of iron compounds were Fe 3 O 4 and FeS∙FeS 2 , which were embedded in the matrix of carbon aerogels. Most of sulfur was evenly distributed on carbon, favoring the formation of −COOH groups. The nature of existed sulfur were investigated by temperature-programmed reaction spectroscopy respectively under the CO 2 and air. The S-doping promoted the regeneration of Fe II and improved the selectivity of 2e − oxygen reduction with iron-based carbon materials. As high as 99 % removal of dimethyl phthalate and 3-chlorophenol were obtained in 240 min. Meanwhile, the EPR results demonstrated that HO∙ was formed by on site decomposing H 2 O 2 with FeSCA, which exhibited high stability with low Fe leaching (< 2 ppm) and high recyclability even in acidic medium.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Qiqin Wang,Kun Peng,Ning Gan,Xiao Liu,Hao Huang,Huikai Shao,Hanying Jin,Jacques Crommen,Zhengjin Jiang
Zwitterionic super-hydrophilic polymers showed fascinating prospects because of their excellent biocompatibility, and antifouling characteristics. However, their commercial development and the application in different fields were limited by their tedious preparation process, unsatisfactory reproducibility and performance. In this study, a rapid fabrication approach based on a sole-monomer system (2-(methacryloyloxy)ethyl-[ N -(2-methacryloyloxy)ethyl]phosphorylcholine (MMPC) was simultaneously employed as monomer and crosslinker) was proposed for preparing the cell membrane biomimetic polymers within only 1 h, which is significantly faster than the conventional multi-monomers based approach (~12 h). Furthermore, the proposed strategy turns out to be very simple, time saving and reproducible. The super-hydrophilicity, excellent separation efficiency, biocompatibility and antifouling ability were also achieved on the resulting biomimetic polymers. It is worth noting that the versatile biomimetic polymers exhibited excellent enrichment capacity for N -glycopeptides or C-reactive protein (CRP) from complex biological matrices as well as great separation performance for small bioactive molecules although the PC analogous moiety is located in the middle of the MMPC molecule. In particular, a quite similar binding mode exists between the MMPC dimer and the natural PC ligands to CRP. Therefore, the sole-monomer system can not only simplify the preparation process and improve the reproducibility of the zwitterionic materials, but also combine the advantages of the biomimetic cell membrane surface and the zwitterionic super-hydrophilic polymers for the separation of biomolecules in complex biological fluids.
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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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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Hongwei Li,Ting-Ting Li,Jinjie Qian,Yan Mei,Yue-Qing Zheng
Ammonia synthesis based on electrocatalytic nitrogen reduction reaction (NRR) by using renewable sources of energy under ambient conditions has attracted wide research attentions. Herein, we report that the noble-metal-free CuCo 2 S 4 /multiwalled carbon nanotube nanocomposite , which is synthesized via a facile one-step hydrothermal and sulfuration approach, can work as the high active and durable catalyst for electrocatalytic NRR. This nanocomposite achieves a high NH 3 yield of 137.5 μg h −1 mg cat −1 and a high Faradaic efficiency of 8.7% at −0.5 V vs reversible hydrogen electrode (RHE) in 0.1 M Na 2 SO 4 solution, which outperforms CuCo 2 S 4 counterpart and most reported NRR catalysts. These results reveal that the MWCNT in nanocomposite not only suppresses the aggregation of CuCo 2 S 4 nanoparticles and maximizes the exposure of active sites, but also contributes to the synergistic effect between CuCo 2 S 4 nanoparticles and MWCNT, and facilitates the interfacial reaction kinetics.
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ELECTROCHIMICA ACTA
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2020
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IF 6.215
M.W. Guo,C.B. Sun,W.Q. Yang,L. Chen,H. Lei,Q.B. Zhang
Deep eutectic solvents with the advantages of being less expensive, non-toxic, renewable, and biodegradable are emerging as versatile solvent systems for the electrochemical synthesis of advanced functional materials. Herein, we study the electrochemical deposition of Mn nanoflake arrays grown on Cu foam and the morphology evolution of Mn crystals in the early stages of nucleation and growth in a choline chloride/ethylene glycol-based deep eutectic solvent (Ethaline-based DES). Thiourea (TU) is an efficient additive that is found to promote the electrochemical reduction of Mn(II) species in Ethaline-based DES and induce the formation of Mn nanoflake architectures with a nanoporous configuration. Investigation of the nucleation and growth processes with chronoamperometric transients reveals that the presence of TU can accelerate the generation of homogeneous Mn nuclei and dramatically enhanced the nucleation rate by modifying the corresponding nucleation and growth model from 3D progressive to 3D instantaneous. TU is found to play an important role in the crystallization kinetics of Mn crystals and manipulate the shapes, sizes, and growth morphologies of the formed Mn films. Our work highlights the importance of additives for controlling the microtopography of nanostructured Mn in Ethaline-based DES for potential electrochemical applications.
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COMPOSITES SCIENCE AND TECHNOLOGY
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2020
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IF 7.094
Jialin Ma,Hengdong Ren,Zhenying Liu,Jun Zhou,Yueqin Wang,Biao Hu,Yin Liu,Ling Bing Kong,Tianshu Zhang
A microwave absorber of MoS 2 -PANI with three-dimensional spherical structure was synthesized. The absorber was prepared by one-step hydrothermal strategy of a two-dimensional nanoflower-like MoS 2 and in-situ oxidation polymerization reaction with an aniline monomer under ice bath conditions. It can be clearly seen from the SEM characterization that the structure of this three-dimensional MoS 2 -PANI microwave absorber is composed of a soft flower-like MoS 2 as a carrier and a successful intercalation of two-dimensional nano-rod PANI . The effects of aniline monomer, initiator and molybdenum disulfide on the microwave absorption properties of MoS 2 -PANI nanocomposites were investigated by adjusting different mass ratios. The results show that the optimized reflection loss (RL) of the MoS 2 -PANI nanocomposites after interlayer is −59.78 dB, a matching thickness of 3.44 mm and an effective absorption frequency range of 6.56–9.68 GHz (RL < -10 dB), covering C-Band and X-band. The outstanding microwave absorption performance of the MoS 2 -PANI nanocomposites is attributed to three factors, including enlarged specific surface area, reduced particle size and increased electrical conductivity .
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
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IF 16.683
Senchuan Huang,Yuying Meng,Yangfei Cao,Fen Yao,Zhujie He,Xuxu Wang,Hui Pan,Mingmei Wu
Heazlewoodite nickel sulfide (Ni 3 S 2 ) has become attractive for electrocatalytic hydrogen evolution reaction (HER). However, strong sulfur–hydrogen bonds (S–H ads ) formed on the surface of Ni 3 S 2 greatly hinder the H ads desorption and reduce HER activity. Herein, amorphous NiWO 4 nanoparticles-decorated Ni 3 S 2 electrocatalysts (NiWO 4 /Ni 3 S 2 ) have been constructed via a two-step hydrothermal method. The heterostructures exhibit much better HER performance than original Ni 3 S 2 by delivering current densities of −10 and −100 mA cm −2 at low overpotentials of 136 and 274 mV, while those for Ni 3 S 2 are 234 and 424 mV, respectively. Moreover, they display ultra-long stability of 75 h. Theoretical calculation proves the improved activity of NiWO 4 /Ni 3 S 2 heterostructures is attributed to highly active interfaces between amorphous NiWO 4 nanoparticles and Ni 3 S 2 electrocatalysts. The strong electronic interaction between NiWO 4 and Ni 3 S 2 decreases the local electron density of Ni and S atoms, facilitates water adsorption on Ni-sites and optimizes hydrogen atom adsorption/desorption on adjacent S-sites with weakened S–H ads .
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Jie Yue,Meng Yuan,Xuan Zhang,Guochang Wen,Guina Ren,Bo Ge,Limin Zhao,Xin Shao
Due to its porous structure, hydrophobic modified three dimensional melamine sponge (MS) was commonly used for high efficiency oil/water separation. Nevertheless, it does nothing to water-soluble pollutants. In order to deal with residual pollutants, the direct Z-scheme BiOI/CdS composites was constructed and loaded onto the melamine sponge which easily achieved efficient degradation and selective deoiling. Furthermore, traditional hydrophobic methods (such as grafting mercaptan, silanes and so on) had several drawbacks, hence a novel metal organic frame material ZIF-8 was adopted in order to attain the purpose of superhydrophobic . In this work, it has shown that the cyclic photodegradation efficiency of superhydrophobic BiOI/CdS/ZIF-8 melamine sponge (BCZ MS) could still achieve 92% after performing 4 cycles of degradation and the results indicated that BCZ MS has preeminent stability. Besides, it was verified by the capture experiment that the main active species was O 2 − .
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SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
Xiao Chang,Xurong Qiao,Kun Li,Ping Wang,Ya Xiong,Xiaofang Li,Fujun Xia,Qingzhong Xue
It is challenging for current metal oxides based acetone sensors to realize excellent ppb-level acetone sensing properties at low working temperature. Herein, the hollow ZnO/MoS 2 nanosheets (HZnO/MoS 2 ) core/shell heterogeneous structures are originally produced. Fast gas transport channels and n–p heterojunctions are produced by the decoration of MoS 2 nanosheets on HZnO surface, resulting in high acetone response and fast response/recovery speed. Ultraviolet (UV) light is introduced to further improve acetone response and drastically reduce working temperature. The light diffraction and reflection caused by the decoration of hierarchical MoS 2 nanosheets could significantly enhance light harvesting. Hence, the excellent acetone sensing properties are obtained by the synergistic effect of UV light and HZnO/MoS 2 core/shell heterogeneous structures. Exactly, at 100 °C, the HZnO/MoS 2 possesses a stable response (1.52) to 100 ppb acetone with UV irradiation while it exhibits no response to 100 ppb acetone without UV. Even at room temperature (30 ℃), UV activated HZnO/MoS 2 still exhibits a stable response (∼1.33) and fast recovery/recovery time (19 s/97 s) to 50 ppm acetone. Furthermore, the DFT calculations are performed to demonstrate the underlying acetone sensing mechanism. The results demonstrate that UV activated HZnO/MoS 2 heterostructure could achieve trace-acetone detection at low temperature.
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Journal of Materials Chemistry C
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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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