Xiao Zhang

Bio: Xiao Zhang is an academic researcher from Qingdao University of Science and Technology. The author has contributed to research in topics: Water splitting & Catalysis. The author has an hindex of 34, co-authored 158 publications receiving 3726 citations. Previous affiliations of Xiao Zhang include Qingdao University & Fudan University.

FePt-Au ternary metallic nanoparticles with the enhanced peroxidase-like activity for ultrafast colorimetric detection of H2O2

Abstract: In this paper, FePt-Au ternary metallic hybrid nanaoparticles (FePt-Au HNPs) were prepared with FePt nanocubes as seeds and then the seeds were combined with Au(I) precursor through a facile hydrothermal approach. And the FePt-Au HNPs were characterized by a series of technical methods such as transmission electron microscopy (TEM), X-ray diffraction pattern (XRD) and UV–vis absorption spectra. Moreover, the as-prepared FePt-Au HNPs possessed the excellent peroxidase-like activity which could rapidly catalyze the oxidation reaction of substrate 3,3′,5,5′ −tetramethylbenzidine (TMB) to obtain a typical blue product which could be observed apparently by the naked eye only within 30 s. Notably, the color response is instant, due to the fast electron transfer between the substrate and H2O2 with the aid of FePt-Au HNPs. Based on the catalytic mechanism of fast electron transfer and the intrinsic peroxidase-like activity of FePt-Au HNPs, a visual colorimetric sensor for ultrafast detecting H2O2 was constructed with a wide linear range of 20–700 μM as well as a relative lower limit of detection (LOD) of 12.33 μM. Furthermore, the ultrafast sensor based on FePt-Au HNPs as peroxidase mimics was also successfully applied to detect H2O2 in milk samples.

Colorimetric and ultrasensitive detection of H2O2 based on Au/Co3O4-CeOx nanocomposites with enhanced peroxidase-like performance

Abstract: The Au/Co3O4-CeOx nanocomposites (Au/Co3O4-CeOx NCs) have been synthesized successfully by a facile two-step method. It was proved that Au/Co3O4-CeOx NCs exhibited an excellent peroxidase-like activity and could efficiently catalyze the oxidition reaction of 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H2O2 to generate a blue product. Furthermore, Au/Co3O4-CeOx NCs possessed a much higher affinity to H2O2 and TMB than horseradish peroxidase (HRP). In view of the excellent peroxidase mimetic catalytic activity of Au/Co3O4-CeOx NCs, a novel, sensitive and efficient colorimetric sensor with Au/Co3O4-CeOx NCs as peroxidase mimics has been constructed unprecedentedly to detect H2O2. Under optimal conditions, the colorimetric platform showed a sensitive response to H2O2 in the range of 10–1000 μM with a limit of detection of 5.29 μM. Moreover, fluorescent data proved that the Au/Co3O4-CeOx NCs could effectively catalyze the decomposition of H2O2 into OH radicals. Thus, we believe that Au/Co3O4-CeOx NCs with high peroxidase-like activity can be employed as nanoenzyme for a wide range of promising applications in biotechnology and environment.

Iron Doped CuSn(OH)6 Microspheres as a Peroxidase-Mimicking Artificial Enzyme for H2O2 Colorimetric Detection

Abstract: We designed and synthesized iron doped CuSn(OH)6 (Fe/CuSn(OH)6) microspheres, which was selected as a nanoenzyme to detect hydrogen peroxide (H2O2), by a coprecipitation method for the first time. ...

Dye-Sensitized Solar Cells

Abstract: Dye-sensitized solar cells (DSCs) offer the possibilities to design solar cells with a large flexibility in shape, color, and transparency. DSC research groups have been established around the worl ...

Mn3O4-Graphene Hybrid as a High Capacity Anode Material for Lithium Ion Batteries

Abstract: We developed two-step solution-phase reactions to form hybrid materials of Mn3O4 nanoparticles on reduced graphene oxide (RGO) sheets for lithium ion battery applications. Mn3O4 nanoparticles grown selectively on RGO sheets over free particle growth in solution allowed for the electrically insulating Mn3O4 nanoparticles wired up to a current collector through the underlying conducting graphene network. The Mn3O4 nanoparticles formed on RGO show a high specific capacity up to ~900mAh/g near its theoretical capacity with good rate capability and cycling stability, owing to the intimate interactions between the graphene substrates and the Mn3O4 nanoparticles grown atop. The Mn3O4/RGO hybrid could be a promising candidate material for high-capacity, low-cost, and environmentally friendly anode for lithium ion batteries. Our growth-on-graphene approach should offer a new technique for design and synthesis of battery electrodes based on highly insulating materials.