DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 16
·5336-5344
·
IF 4
Lijun He,Jia Yang,Wenbin Guo,Yan Li,Alberto J. Fernández-Carrión,Xiaojun Kuang
A controlled chemical reduction process was performed on LaCrO3 assisted by CaH2 at a relatively low temperature (773 K), and the impact on the photocatalytic and magnetic properties is discussed. The reduction process leads to the formation of oxygen vacancies that enhance photocatalytic properties by acting as traps that retard the hole/electron recombination processes. In addition, the existence of oxygen defects induces some subtle structural modifications, resulting in Cr–O–Cr angle variation that influences the magnetic behavior of the material. Therefore, the use of a controlled chemical reduction process is an effective method for tunning the physical–chemical properties of transition-metal oxide-based materials, even in cases with high chemical stability.
研究领域:
材料化学
·
光催化
·
固体化学
·
功能材料
·
无机化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Qibo Zhang,Rui Wang,Konghao Chen,Yixin Hua
Electrochemical deoxygenation of porous CuO pellet to prepare copper was investigated in the 33.3-66.7 mol% Choline chloride (ChCl)-EG eutectic melt at 353 K. Cyclic voltammetry of the Pt-powder cavity microelectrode loaded with CuO powder exhibited that the solid CuO can be electrochemically reduced in solid state in the eutectic melt. Constant-voltage (2.0 to 2.4 V) electrolysis, with an assembled cathode of a sintered porous CuO pellet and a graphite anode, that performed in the eutectic melt demonstrated the conversion process of oxide-to metal as confirmed by scanning electron microscopy, energy-dispersive X-ray, and X-ray diffraction spectra. A mechanism for this reduction process has been proposed on the basis of the in situ formation of numerous gas at the cathode, emphasizing that the oxidation of cathodically generated O 2− ions occurred nearby along with the copper electroreduction , in which the new formed metal was served as a temporary anode, oxygen was generated at the interface of the reduced copper and electrolyte inside the cathode.
研究领域:
电化学
·
材料科学
·
冶金工程
·
无机化学
·
能源材料
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2018
·
IF 3.641
Junhua Zhang,Zhaoli Yan,Liangjie Fu,Yi Zhang,Huaming Yang,Jing Ouyang,Deliang Chen
Acid-activated sepiolite nanofibers (ASep) were organically modified with (3-aminopropyl) triethoxysilane (APTES) to produce the amino-functionalized nanofibers (NH 2 -ASep). Due to the amino groups, highly dispersed silver nanoparticles (AgNPs) were assembled on the surface of NH 2 -ASep by a simple chemical reduction approach, and the AgNPs were smaller than those directly deposited onto ASep surface. The as-synthesized Ag/NH 2 -ASep nanofiber catalysts exhibited an excellent catalytic activity in the reduction process of 4-nitrophenol to 4-aminophenol with full conversion within 150 s in the presence of NaBH 4 as the reductant . The results indicated that Ag/NH 2 -ASep nanofiber catalysts exhibited excellent catalytic activities because the highly dispersed of small-sized AgNPs were exposed on the surface of highly dispersed nanofibers with amino functional groups, allowing effective contact with the reactants and catalysis of the reaction. Moreover, the Ag/NH 2 -ASep nanofiber catalysts are stable and easy to use for the catalytic reaction due to their one-dimensional nanofiber structure with functional amino groups.
研究领域:
材料科学
·
纳米技术
·
环境催化
·
无机化学
·
应用化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2009
·
IF 1.51
Rongguan Lv,Jun Yang,Pengfei Gao,Yanna NuLi,Jiulin Wang
A mixture of nanoporous and nanofibrous silicon (NPNF-Si) is prepared by the mechanochemical reduction of SiCl 4 using Li 13 Si 4 as reducing agent in the presence of Super P carbon (SP) and the following thermal treatment and washing process. Morphologies and structures of the as-obtained composites are investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). After carbon coating via pyrolysis of polyvinyl chloride (PVC), the resulting NPNF-Si/SP/C composite is evaluated for the use as anode material in lithium-ion battery. It exhibits the first discharge capacity of 746.6 mAh g −1 at current density of 0.2 mA mg −1 and capacity retention of 91.1% after 30 cycles. The good electrochemical performance arises from the particular Si nano-structure, which can alleviate the volume effect during lithium insertion and extraction.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
锂离子电池
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2014
·Vol. 16
·期 37
·8910-8916
·
IF 3.858
Feng Ye,Hui Liu,Wenlai Huang,Jun Yang
Controlling the morphology of noble metal nanoparticles can be an effective way to produce nanomaterials with favourable properties. Herein, we report our study on the effects of diffusion rate and reaction kinetics on the morphology of a number of noble metal (Au, Ag, Pd, and Pt) nanoparticles. A glass reactor based on electrochemical reduction or photo-reduction has been designed to achieve control of diffusion and chemical reduction of the different noble metal precursors. The results show that the noble metal nanoparticles with flower-like, core–shell, or wheel-like morphologies could be obtained at a relatively high diffusion rate due to the presence of additional growth of metal precursors on the preformed metal nuclei, while at relatively low diffusion, the as-prepared noble metal nanoparticles are small and quasi-spherical due to the relatively fast reduction of metal precursors. The experimental observations are also confirmed qualitatively by kinetic Monte Carlo (kMC) simulations. Since diffusion and reaction kinetics are universal and key factors in the synthesis of nanomaterials, the findings in this work might provide an effective way to manipulate the morphology of nanomaterials for a given application.
研究领域:
纳米材料科学
·
物理化学
·
材料合成
·
胶体与界面化学
·
计算材料学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2014
·
IF 3.84
Suling Yang,Gang Li,Guifang Wang,Junhong Zhao,Zhihui Qiao,Lingbo Qu
Through a simple, rapid and green method, a small size of yttrium hexacyanoferrate nanoparticles (YHCFNPs) was synthesized firstly. As the novel sensing materials, a sensor of YHCFNPs/chemically reduced graphene oxide (CRGO) nanocomposite modified carbon paste electrode (CPE) was fabricated. Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscope (SEM), inductive coupled plasma emission spectrometer (ICPES) and electrochemistry were performed to characterize the modified electrode. SEM images showed that the average diameter of the prepared YHCFNPs was about 40 nm. The electrochemical behavior of the YHCFNPs/CRGO/CPE in response to rutin was studied. The response current of rutin at the YHCFNPs/CRGO/CPE was obviously higher than that at the other modified CPE. Under the optimal conditions, YHCFNPs/CRGO/CPE exhibited a broader detection range from 2.0 to 4000 nmol/L with a nanomolar detection limit of 0.82 nmol/L ( S / N = 3). This novel method was successfully used to determine rutin in pharmaceutical tablets.
研究领域:
分析化学
·
电化学传感
·
纳米材料
·
药物分析
·
生物医学工程
✓ 已验证
DOI
高影响因子
CARBON
·
2016
·
IF 6.198
Yuhui Xie,Xinxin Sheng,Delong Xie,Zixian Liu,Xinya Zhang,Li Zhong
The porous graphene hydrogels (GHs) are of particular interest in various applications, such as energy-storage devices, catalyst and sensors. In this paper, GHs with controllable pore structure are prepared from graphene oxide (GO) aqueous dispersion by a facile chemical reduction method. The pore size distribution (PSD) and specific surface area (SSA) of GHs can be regulated by adjusting the pH value of GO dispersion. It is found that both the pore size and SSA of GHs gradually increase with the pH value of GO dispersion. For the GH prepared at pH = 1.65, the PSD has one peak at 1.83 nm with a SSA of 723.35 m 2 /g. As the pH value increases to 11.73, the peak moves to 3.2 nm and the SSA keeps rising to 1107.24 m 2 /g. Rheological measurements show that both the storage modulus and yield stress of the GHs decrease with the increasing pH value. Electrochemical evaluation of GHs as the electrodes of supercapacitors reveals that the specific capacitance reaches the highest value for GH prepared at pH = 5.25, which has a specific pore structure, showing the coexistence of large (3.2 nm) and small pores (1.89 nm).
研究领域:
材料科学
·
纳米科技
·
电化学
·
能源存储
·
高分子物理
·
胶体与界面科学
·
功能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）