NANOTECHNOLOGY
·
2021
·Vol. 32
·期 34
·345706
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IF 3.874
Leqiu He,Yan Wang,Yajie Guo,Guobing Li,Xubin Zhang,Wangfeng Cai
Novel core−shell nanostructure electrodes benefit from the excellent properties of their constituent materials, as well as the synergy between them. However, it is challenging to fabricate such structures efficiently. In this study, NiSe nanorods were fabricated using Ni foam as the conductive substrate and reactant via a one-step hydrothermal process, and Ni(OH)2 nanosheets were coated on the surface of the nanorods via one-step electrodeposition. The effect of the structure and morphology on the properties of the material was explored using scanning electron microscopy, x-ray diffraction, and electrochemical technology. The obtained core−shell NiSe/Ni(OH)2 exhibited an areal capacity of 1.89 mAh cm−2 at a current density of 5 mA cm−2. The assembled NiSe/Ni(OH)2//AC hybrid supercapacitor exhibited excellent energy and power densities, indicating that NiSe/Ni(OH)2 has great potential for use as a battery-type electrode in energy storage systems.
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Journal of Energy Storage
·
2021
·
IF 6.583
Xiaobo Chen,Jiangyue Zhu,Jianghao Cai,Yang Zhang,Xiaohua Wang
Herein, we report a composite structure by incorporating MoSe 2 nanosheets in organ-like Ti 3 C 2 T x MXene (MXene/MoSe 2 ) as new nanohybrid anode materials for high-performance asymmetric supercapacitors. Benefits of the positive advantages including unique heterostructure, enhanced active area for redox reactions, and beneficial synergetic interaction, the specific capacitance of the MXene/MoSe 2 composite electrode was high up to 1358.5 F g −1 at 1 A g −1 , much higher than that of the pure Ti 3 C 2 T x MXene and MoSe 2 electrodes. In addition, when applied the synthesized Ti 3 C 2 T x MXene/MoSe 2 nanohybrid as positive electrode in asymmetric supercapacitor (ASC), excellent performance is observed. For instance, a high specific energy of 55.6 Wh kg −1 , high specific power of 800.3 W kg −1 with the capacitance retention of 94.1% even after 10,000 cycles at a high current density of 5 A g −1 are obtained. These results indicate that the MXene/MoSe 2 composite will be a high promising candidate for supercapacitors.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Xianwen Zhang,Ping Li,Bin Xu,Jingxia Wang,Guangyin Fan,Xiaobin Zhang,Xiaoqiang Liu,Kaiming Zhang,Weidong Jiang
Selective hydrogenation of halogenated nitrobenzenes (XNBs) to halogenated amines (XANs) is of great importance for practical applications. Non-noble metal-based catalysts have shown prominent advantages in price and reserves accompanying low activity and selectivity toward the hydrogenation of halogenated nitrobenzenes (XNBs) even under harsh conditions. In this work, inexpensive Ni–Co-based composites (NxCC) were prepared for in situ tandem hydrogenation of XNBs to XANs by using hydrogen released from ammonia borane (AB) hydrolysis under ambient pressure. The results show these NxCC samples exhibited superior catalytic performance against Co3O4 or NiO samples. A selected N0.2CC catalyst as the mainly screened one can quantitatively convert XNBs to XANs with unprecedented activity with 100% XAN conversion. This catalyst can completely convert m-chloronitrobenzene (m-CNB) to m-chloroaniline (m-CAN), suggesting N0.2CC efficiently suppresses the further dichlorination of m-CAN. Recycling test shows the N0.2CC possesses higher stability and recyclability. The N0.2CC catalyst was found to be a dual catalyst that synergistically catalyzes both the AB dehydrogenation (about 1735 mL min–1 g–1 of hydrogen generation rate) and the subsequent hydrogenation (almost 100% conversion) of XNBs. Notably, it is the first time that the rapid in situ hydrogen activation (IHA) which facilely arouses the efficient hydrogenation of adsorbed substrate on the surface of catalyst has been elaborated. From a unique perspective, distinctive and simple control experiments were innovatively designed for testifying the advantage of tandem hydrogenation in contrast with traditional hydrogenation. This work presents an efficient and environmental strategy to selectively produce XANs from XNBs using high-performance non-noble metal composites.
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Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 30
·9599-9609
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IF 7.393
Cong Shen,Yanqing Zhu,Zixiao Li,Jingling Li,Hong Tao,Jianhua Zou,Xueqing Xu,Gang Xu
InP quantum dots (QDs) are considered as the most promising alternative to Cd-based QDs with lower toxicity, and emission spectrum tunability ranging from the visible to near-infrared region. Although high-quality fluorescent InP QDs have been successfully synthesized by several groups, the rigorous synthesis conditions hinder its practical use in display devices. In this work, for the first time, we introduce Zn2+ into the growth stage of the InP QDs to prepare an InP–In(Zn)P core, and then the as-grown InP–In(Zn)P cores were consecutively coated with typical double shells of inner ZnSe and outer ZnS. The final InP–In(Zn)P/ZnSe/ZnS core/shell/shell QDs exhibited a maximum photoluminescence (PL) quantum yield (QY) of 94.3% and have tunable emissions from yellow (569 nm) to red (630 nm), showing a potential application in display devices. Above all, compared with other related studies, the excellent PL properties were obtained in relatively milder conditions (ultimate vacuum level of 400 mTorr). The results of this study provide guidance for the commercial application of InP QDs as a viable alternative to Cd-based QDs.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Fang-Yu Yuan,Chen-Sheng Lin,Yi-Zhi Huang,Hao Zhang,An-Yi Zhou,Guo-Liang Chai,Wen-Dan Cheng
In this work, we chose to explore the infrared (IR) nonlinear optical (NLO) materials centering on Cd and Ge elements, and finally synthesized a new IR NLO quaternary selenide BaCdGeSe 4 . Compound BaCdGeSe 4 crystallizes in non-centrosymmetric (NCS) space group Fdd 2 (No. 43), and it is built by parallel two-dimensional (2D) anionic [CdGeSe 4 ] 2- layers with the cation Ba 2+ embedded between the layers. Under the 2050 nm laser excitation, compound BaCdGeSe 4 appears type-I phase-matchable behavior and its second-harmonic generation intensities is about 0.5 times of AgGaS 2 .
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Nanoscale Advances
·
2021
·Vol. 3
·期 8
·2334-2342
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IF 4.553
Senlin Qu,Xin Yuan,Yu Li,Xingyang Li,Xiujuan Zhou,Xiaogang Xue,Kexiang Zhang,Juan Xu,Changlai Yuan
The composition and defect tolerance of CuInSe2 (CISe) quantum dots (QDs) provide a scaffold to design defects via tailoring the elemental ratio or distributions for boosting photocatalytic H2 evolution (PHE). Herein, a ligand-assisted two-step aqueous method was developed to prepare defect CISe quantum dots for the first time. UV-vis, XPS, HRTEM, and HADDF investigations confirmed the typical double-absorption edges of copper vacancy defects and indium substituted at copper site defects in the structure constructed through initial synthesis tuned by Cu/In ratio and the ensued coarsening. The steady-transient PL suggested that the D–A recombination with prolonged PL lifetime dominated the emission of composition-optimized CuInSe2 with the Cu/In ratio of 1/4 (CISe-1/4). Further transient photocurrent and electrochemical impedance spectroscopy investigations demonstrated that surface defects in the structure favor the carriers' separation/transportation. The CISe-1/4 exhibited a superior PHE rate of 722 μmol g−1 h−1, about 23 times higher than that of the initially synthesized CISe-1/4 nucleus (31 μmol g−1 h−1), with a maximum apparent quantum efficiency (AQE) of 1.3%. The analysis of energy levels and the coulombic interaction energy of electron–hole (Je/h) based on Raman, extending UV-vis spectra investigations suggested that surface defects resulted in decreased Je/h of CISe-1/4, favoring the enhanced PHE of this structure. This work is expected to provide a reference for designing effective non-noble metal I–III–VI photocatalysts.
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BIOMATERIALS
·
2021
·
IF 12.479
Jichun Yang,Shuojiong Pan,Shiqian Gao,Tianyu Li,Huaping Xu
Carbon monoxide (CO) therapy and antiangiogenesis therapy (AAT) are regarded as promising approaches for cancer treatment. However, the poor tumor targeting ability and inevitable side effects prevent their clinical application. In this study, we developed H 2 O 2 -responsive diselenide-containing micelles that combined CO therapy with chemosensitization therapy and AAT in a single system. Under the interaction of intratumoral H 2 O 2 , CO and gemcitabine (GEM) were released in situ from the micelles to reduce side effects, and CO significantly sensitized the chemotherapeutic effect of GEM by elevating the level of reactive oxygen species (ROS) in human gastric cancer AGS cells. Furthermore, diselenide bonds in the micelles were oxidized to seleninic acid in organic form, which suppressed the expressions of vascular endothelial growth factor (VEGF) and matrix metalloproteinase-2 (MMP-2) to realize AAT. This study provides an integrated solution to combine CO therapy with chemosensitization therapy and AAT together with good biocompatibility .
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Bin Li,Haoyu Hu,Han Hu,Congcong Huang,Dongqing Kong,Yanpeng Li,Qingzhong Xue,Zifeng Yan,Wei Xing,Xiuli Gao
Lithium-ion capacitors (LIC) have problems such as the imbalance of electrochemical kinetics between the battery-type anode and the capacitive cathode, and the large change in the working potential of the hard carbon anode during charge and discharge, which limit the improvement of electrochemical performance for LIC. To solve these problems, CoSe 2 nanoparticles embedded nitrogen-doped hard carbon microspheres (NCS-CoSe 2 ) are synthesized and used as the anode material of LIC. Electrochemical tests show that NCS-CoSe 2 has a reversible specific capacity of as high as 500 mAh g −1 at a current density of 1 A g −1, which can effectively stabilize the working potential of the anode. At a high working voltage window of 2.2–4.5 V, the potential change of the NCS-CoSe 2 anode is as low as 0.35 V, significantly smaller than that of the pure hard carbon (0.87 V). Regarding the electrode kinetics, the NCS-CoSe 2 anode is matched with the active carbon cathode well. When the power density rises sharply from 335 W kg −1 to 6700 W kg −1 , the energy density of NCS-CoSe 2 //AC LIC can attain 82 Wh kg −1 (56.9% of initial energy density).
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CATALYSIS LETTERS
·
2021
·Vol. 151
·期 9
·2560-2569
·
IF 3.186
Han Jishu,Wang Ying,Liu Ying,Bai Jiayu,Zhao Ruiyang,Wang Lei
In this paper, novel CdSe/NH 2 -MIL-101(Cr) nanocomposites for photocatalytic hydrogen production were synthesized. When the prepared NH 2 -MIL-101(Cr) MOFs were modified with CdSe QDs, the photocatalytic hydrogen production amount was significantly increased and reached to 17,664 μmol g −1 in 7 h. The formation of CdSe/NH 2 -MIL-101(Cr) nanocomposites enhanced the light absorption intensity, broadened the visible light absorption range, promoted the transfer of photogenerated electrons and inhibited the recombination of photogenerated electron–hole pairs, then effectively improved the photocatalytic hydrogen production performance. In addition, the CdSe/NH 2 -MIL-101(Cr) nanocomposites exhibited high cycle stability, which was beneficial to the practical application in photocatalytic hydrogen production. Graphic Abstract
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Sishun Wang,Kejun Bu,Dong Wang,Chong Zheng,Xiangli Che,Zhen Han,Fuqiang Huang
A new platinum-based ternary selenide, Pt 3 Pb 2 Se 2 was successfully synthesized at 1123 K by using a traditional solid-state method. It crystallizes in a orthorhombic structure with the Cmcm space group, and consists of quasi-2D [Pt 3 Pb 2 Se 2 ] layers connected by inherent Pt–Pb bonds. It is related to the parkerite structures with half transition metal occupation. Therefore, it belongs to the half anti-perovskite family structure. The R-T curve reveals its metallic behavior and shows high conductivity (RRR = 20.5) at room temperature. The X-ray photoelectron and ultraviolet photoelectron spectroscopy spectrums were collected. It has low work function ( ϕ = −4.02 eV). First principles calculations were consistent with the experimental results.
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INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Xiao Shao,Yue Wu,Shuang Jiang,Bin Li,Tianyong Zhang,Yong Yan
Three-dimensional (3D) nanomaterials have been intensively investigated because of their unique properties and wide range of potential applications; however, the ligand-induced chirality in 3D semiconductor nanocrystals has been scarcely studied. In this paper, we report the synthesis of hydrophobic 3D CdSe nanotetrapods (Tps) with a high degree of uniformity in their morphology by using the hot-injection method. The core and arms of Tps are distinct in their crystal structure, thus creating an intracrystal heterojunction. The size of Tps, primarily the length of four arms, is controlled by changing the amount of didecyldimethylammonium bromide and reaction time. Next, enantiopure cysteine ligands were introduced to replace the hydrophobic native stabilizers to prepare chiral l- and d-cysteine-capped CdSe Tps. Importantly, the circular dichroism (CD) line shapes of l/d-cysteine-capped CdSe Tps are assigned to the different excitonic transitions of the core and arms, respectively. In addition, the observed CD activities are found to be sensitive to the size of the CdSe Tps, where the anisotropic g factors have increased and reached the maximum value at a moderate aspect ratio (AR) and a further increase of the AR leads to a decrease of the g factor. Because of charge transfer between the core and arms, we propose a plausible mechanism potentially responsible for the induced CD line shapes in terms of the excitonic states of Tps with two different crystal structures. We believe that chiral 3D nanomaterials with anisotropic morphologies could offer new opportunities for relevant applications.
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Environmental Science-Nano
·
2020
·Vol. 7
·期 12
·3877-3887
·
IF 7.683
Wanjun Wang,Wenquan Gu,Guiying Li,Haojing Xie,Po Keung Wong,Taicheng An
Sustainable and “green” technologies for hydrogen peroxide (H2O2) production have aroused increasing interest, yet challenges prevail in production of H2O2 for environmental applications. In this study, tungsten selenide (WSe2) with a few-layered microstructure was used as a new co-catalyst to synthesize H2O2 under visible light irradiation. The ultrathin WSe2 nanosheets were anchored onto a g-C3N4 surface by in situ growth solvothermal methods. The as-prepared WSe2/g-C3N4 showed remarkably enhanced H2O2 production efficiency without organic electron donors, which was 11.8 times higher than that of pristine g-C3N4. H2O2 was generated via O2 reduction mediated by photogenerated e−, and dissolved O2 could be generated by water oxidation and in situ used to produce H2O2 under anaerobic conditions. The introduction of WSe2 not only promoted visible light absorption, but also facilitated the charge transfer efficiency by forming a Z-scheme rather than a type II heterojunction. The photogenerated e− was enriched onto WSe2, leading to the high H2O2 production activity. Moreover, the in situ generated H2O2 could be directly used for pathogenic bacteria inactivation through Fenton reactions without external H2O2 addition. This work is expected to open an avenue for developing novel photocatalysts towards sustainable H2O2 production for water disinfection and related environmental applications.
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