期刊：
Journal of Colloid and Interface Science,2021年586:47-55 ISSN：0021-9797
通讯作者：
Tan, Wenhu
作者机构：
[Huang, Xintang; Cheng, Yue; Tan, Wenhu; Li, Xin; Zhang, Yunzhuo] Cent China Normal Univ, Dept Phys Sci & Technol, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Tan, Wenhu] C;Cent China Normal Univ, Dept Phys Sci & Technol, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
关键词：
Cu-supported Ag nanowires;Silver-zinc batteries;Ultrahigh areal capacity;Lattice defection;Synergistic effect
摘要：
As one of the most mature battery systems, the silver-zinc battery holds huge promise in the field of aqueous rechargeable batteries due to superior performance, high safety and environmental friendliness. It is urgent to improve the areal capacity of silver-zinc batteries so far. This study reports a novel Cu-supported Ag Nanowires ([email protected]1-5: abbreviation of [email protected]1, [email protected]2, [email protected]3, [email protected]4 and [email protected]5) as binder-free cathodes for high performance rechargeable aqueous silver-zinc batteries. [email protected]1-5 are successfully prepared by two steps of electrochemical nanoengineering and mild galvanic replacement between Cu and [Ag(NH3)2]+ chelate ions under green solution. With ultrahigh Ag loading of above 81 mg cm−2, the [email protected]5 cathode achieves ultrahigh areal capacity of above 36 mAh cm−2 at current density of 10 mA cm−2. Benefiting from synergistic effect of Ag and Cu, multiply twinned structure accompanied by lattice defections (such as lattice distortion, mismatch and dislocation) and heterostructures, the [email protected]1-5 cathodes achieve excellent Ag utilization and cycling stability. Furthermore, the aqueous rechargeable [email protected]5-Zn battery demonstrates an excellent areal capacity of 36.80 mAh cm−2 at 10 mA cm−2. This work offers a promising pathway to greatly enhance areal capacity of bimetallic nanostructure-based electrodes and the [email protected]1-5-Zn batteries are attractive for large-scale energy-storage application.
摘要：
The coating of silica (SiO2) on quantum dots (QDs) has been widely studied, because SiO2 can protect QDs from the damages of moisture, radiation, and heat. Conventional SiO2 coating methods for QDs are usually performed in aqueous or emulsion solutions, which require the addition of water for the hydrolysis of SiO2 precursors and lead to the photoluminescence (PL) quenching of QDs. To address this issue, a novel SiO2 coating approach on single particle level was developed by the thermally forcing decomposition of tetraethyl orthosilicate in toluene. The CdSe/CdS/ZnS:Al@SiO2 nanoparticles (NPs) were prepared without decreasing the original PL quantum yield (QY), which exhibited much better photo and thermal stability in comparison with uncoated CdSe/CdS/ZnS:Al QDs. Furthermore, due to the natural formation of silanol groups on the SiO2 shell, CdSe/CdS/ZnS:Al@SiO2 NPs present not only good solubility but also excellent room temperature stability in phosphate buffer saline solution for several months. (C) 2019 Elsevier B.V. All rights reserved.
摘要：
The operating voltage of aqueous hybrid capacitors are generally limited to 2 V due to the decomposition of water, which significantly impede the progress of energy density. Herein, the porous low-crystalline FeOx nanorod array on carbon cloth is prepared by the novel electrochemical Li+ pre-insertion method, and a 2.4 V high-voltage aqueous hybrid capacitor device is successfully obtained after matching with the nickel doped (Ni0.25Mn0.75)(3)O-4@PPy nanoprisms array. The low-crystalline structure of FeOx preserved during the first Li+ insertion and space created via the elimination of low-crystalline Li2O dramatically provides sufficient electronic and ionic transfer channels. In addition, surface polypyrrole (PPy) stabilization is employed to further enhance electron conductivity and electrode stabilization. Benefitting from increasing active sites, fast ion diffusion and electron transfer the obtained lowcrystalline FeOx@PPy electrode exhibits improved electrochemical performance, especially for capacitance and stability. Moreover, the aqueous hybrid capacitors (Ni0.2.5Mn0.75)(3)O-4@FFy//FeOx@PPy device delivers a high energy density of 72.4 Wh kg(-1) with the ultra-high voltage, and admirable cycling stability (94.7% retention after 4000 cycles). Our work highlights the novel electrochemical Li+ pre-insertion method to achieve superior low-crystalline electrodes materials and designs the high-voltage aqueous hybrid energy storage devices. (C) 2020 Elsevier B.V. All rights reserved.
期刊：
Journal of Electroanalytical Chemistry,2020年864:114118- ISSN：1572-6657
通讯作者：
Huang, Xintang
作者机构：
[Sarkis, Sarkis; Huang, Xintang] Cent China Normal Univ, Inst Nanosci & Nanotechnol, Dept Phys Sci & Technol, Wuhan 430079, Peoples R China.
通讯机构：
[Huang, Xintang] C;Cent China Normal Univ, Inst Nanosci & Nanotechnol, Dept Phys Sci & Technol, Wuhan 430079, Peoples R China.
关键词：
3D porous Ni nanosheet arrays;Annealing treatment;Ultra-high energy density;Hybrid supercapacitor
摘要：
3D porous nickel nanosheet arrays ([email protected] foam) are prepared by a facile hydrothermal process followed by an annealing treatment. The synthesized [email protected] foam offered a mesoporous nano structure. First, Ni(OH)2 nanosheet arrays on Ni foam are synthesized by a hydrothermal process. Then, the Ni(OH)2 nanosheet arrays are transformed to [email protected] foam via horizontal furnace tube. The [email protected] foam electrode shows a high areal capacitance 4683.6 mF cm−2 at a current density of 1 mA cm−2, a capacitance retention of 80.8% at 10 mA cm−2, low internal resistance Rs~0.75 Ω and a retention ratio of 95.8% after 20,000 charge/discharge cycles. The capacitance of [email protected] foam is much higher than that of the Ni(OH)2 nanosheet arrays. The outstanding electrochemical characteristic performances of the [email protected] foam can be ascribed to the 3D porous nano structures of [email protected] foam, which can offer short diffusion routes for charge carriers (electrons and ions), large active areas between the interface of the electrode/electrolyte and the low internal resistance between grown [email protected] foam and the conductive current collector. Its hybrid supercapacitor device is assembled by using the [email protected] foam as the positive electrode and activated carbon [email protected] foam as the negative electrode. The hybrid supercapacitor device reaches an ultra-high energy density of 141.04 Wh kg−1 and a power density of 226.14 W kg−1 at 1 mA cm−2. The remarkable pseudocapacitive performance of [email protected] foam electrode shows its great potential in applications of energy storage and conversion devices.
作者机构：
[Li, Xiu; Huang, Xintang] Cent China Normal Univ, Inst Nanosci & Nanotechnol, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Li, Xiu; Chen, Chen; Zhang, Faqiang; Yi, Zhiguo] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China.
通讯机构：
[Huang, Xintang; Yi, Zhiguo] C;Cent China Normal Univ, Inst Nanosci & Nanotechnol, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China.
摘要：
Ferroelectrics with a perovskite structure, exhibiting strong coupling between photons, carriers, and phonons, have been demonstrated to show a strong photostrictive response. Limited by the optical bandgap, most of the reported ferroelectric perovskites respond only to UV light or weakly respond to visible light below 550nm. Herein, the photostrictive performance of CaCu3Ti4O12 (CCTO) ceramics, with a low bandgap of similar to 1.5eV (ideal for solar spectrum absorption), is comprehensively investigated. Although the compound presents no ferroelectricity, in general, a giant photostriction of similar to 10(-3) with a large photostrictive efficiency of similar to 10(-11) m(3)/W in CCTO ceramics is observed by applying purple (405nm), green (520nm), and red (655nm) laser illumination. Evidenced by the XRD peak shifts under external laser illumination and the phonon mode shifts via the power-dependent Raman spectrum, the light-induced non-thermal deformation in CCTO is attributed to the enhanced stretching of O-Ti-O chains and the distortions of TiO6 octahedrons. The excellent and uniform photostrictive performance of CCTO ceramics in the visible-light region makes them potential candidates for practical applications in next-generation photo-driven electromechanical devices.
摘要：
Catalyst-free growth of graphene directly on dielectric substrates is a challenging work for graphene-based electronics. In this paper, a simple method to synthesize large area few layer graphene films on silicon dioxide/Si substrates by chemical vapor deposition is reported. A novel liquid carbon source (ethylene glycol) is used, without any catalysts. The obtained graphene films are characterized by Raman spectroscopy, x-ray photoelectron spectroscopy, atomic force microscopy. The field effect transistor with graphene film as channel material is fabricated, and the carrier mobility is 707 cm(2) V-1 .S-1. This work offers a new strategy to directly grow graphene on silicon dioxide/Si substrates, and the as-synthesized graphene films may have potential applications in sensors, conductive films, electronic devices, etc.
摘要：
<![CDATA[<ce:abstract xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns="http://www.elsevier.com/xml/ja/dtd" id="abs0005" class="author-highlights" view="all"><ce:section-title id="sect0005">Highlights</ce:section-title><ce:abstract-sec id="abst0005" view="all"><ce:simple-para id="spar0110" view="all"><ce:list id="lis0005"><ce:list-item id="lsti0005"><ce:label>?</ce:label><ce:para id="par0005" view="all">Fe<ce:inf loc="post">2</ce:inf>O<ce:inf loc="post">3</ce:inf>-loaded NiO nanosheets possess relatively large BET surface area.</ce:para></ce:list-item><ce:list-item id="lsti0010"><ce:label>?</ce:label><ce:para id="par0010" view="all">The gas sensor based on 1.5% Fe<ce:inf loc="post">2</ce:inf>O<ce:inf loc="post">3</ce:inf>-loaded NiO nanosheets exhibits relatively high response of 170.7 and 107.9 with response/recovery time of 0.5/14.6s and 0.1s/11.4s to 100ppm ethanol and methanol at 255°C, respectively.</ce:para></ce:list-item></ce:list></ce:simple-para></ce:abstract-sec></ce:abstract><ce:abstract xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns="http://www.elsevier.com/xml/ja/dtd" id="abs0010" view="all" class="author"><ce:section-title id="sect0010">Abstract</ce:section-title><ce:abstract-sec id="abst0010" view="all"><ce:simple-para id="spar0115" view="all">Porous Fe<ce:inf loc="post">2</ce:inf>O<ce:inf loc="post">3</ce:inf>-loaded NiO nanosheets were obtained by the thermal decomposition nanosheets of iron element-loaded Ni(OH)<ce:inf loc="post">2</ce:inf>synthesized via microwave-assisted liquid-phase synthesis under atmospheric condition. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopic (TEM) and Brunauer Emmett Teller (BET) N<ce:inf loc="post">2</ce:inf>adsorption–desorption analysis were used to characterize the as-prepared products. Gas sensing measurement indicated that the sensor based on the 1.5% Fe<ce:inf loc="post">2</ce:inf>O<ce:inf loc="post">3</ce:inf>-loaded NiO nanosheets exhibits untra
期刊：
Materials Research Express,2018年5(4):045036- ISSN：2053-1591
通讯作者：
Huang, Xintang
作者机构：
[Tan, Jianfeng; Huang, Xintang; Dun, Menghan; Li, Long] Cent China Normal Univ, Dept Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Huang, Xintang] C;Cent China Normal Univ, Dept Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Hubei, Peoples R China.
关键词：
Co3O4;porous ultrathin nanosheets;hollow and hollowed-out nanoboxes;high sensitive;ultra-fast response/recovery;toluene gas
摘要：
Hollow and hollowed-out Co3O4 nanoboxes (denoted as Co3O4-HHNBs) that assembled by porous ultrathin nanosheets (similar to 2 nm) have been synthesized through a morphology-conserved transformations of metal-organic framework (MOF) based precursors strategy and then applied to gas sensors. The switching process used a facile two-step approach, including the formation of box-shaped Co(OH)(2) followed by thermal conversion to Co3O4-HHNBs. The sensors based on Co3O4-HHNBs exhibit high response with the value of 56.6 to 100 ppm of toluene at 200 degrees C and 15.9 for ethanol at 220 degrees C, respectively. The response/recovery time to 50 ppm toluene and ethanol are as short as 10 s/9 s and 0.4 s/0.5 s at 200 degrees C, respectively. The formation mechanism of Co3O4-HHNBs and the gas sensing mechanism are discussed in detail. Benefiting from the unique structural features, it exhibit high response and ultra-fast response/recovery speed. This synthesis concept of Co3O4-HHNBs may open new avenues to fabricate high performance gas sensor by carefully controlling the morphology of sensitive nanomaterials.
摘要：
Rational design of magnetic materials with desired magnetic properties has attracted wide interest in recent decades. Herein, we present a new 2D cobalt(II) metal-organic framework, namely [Co(MQ)_2(V_2O_6)_2]_n·4 nH_2O 1, which was hydrothermally synthesized by the reaction of Co(NO_3)_2·4H_2O, N-methyl-4,4′-bipyridinium (MQ+) chlorine salt and NH_4VO_3. Single-crystal X-ray diffraction analysis reveals that 1 crystallizes in C2/c space group with a = 16.290(5), b = 7.815(2), c = 25.297(7) A, β = 108.459(5)°, V = 3054.8(15) A~3, Z = 4, D_c = 1.890 g/cm~3, μ = 1.791 mm~(-1), F(000) = 1748, the final R = 0.0444 and wR = 0.1208 with I > 2σ(I). The individual Co(II) is connected and well separated by diamagnetic [V_2O_6]~(2-) linkers. Magnetic measurements confirm that 1 exhibits ferrimagnetic interactions.
