Harbin Engineering University

About: Harbin Engineering University is a education organization based out in Harbin, Heilongjiang, China. It is known for research contribution in the topics: Control theory & Computer science. The organization has 31149 authors who have published 27940 publications receiving 276787 citations. The organization is also known as: HEU.

Hull shape optimization for autonomous underwater vehicles using CFD

Abstract: Drag estimation and shape optimization of autonomous underwater vehicle (AUV) hulls are critical to energy utilization and endurance improvement. In the present work, a shape optimization platform ...

Synthesis and Exfoliation of Layered α‐Co(OH)2 Nanosheets and Their Electrochemical Performance for Supercapacitors

Abstract: A novel facile approach has been developed to prepare graphene-like α-Co(OH)2 two-dimensional ultrathin nanosheets. The layered hydrotalcite-like α-Co(OH)2 aggregates were successfully exfoliated in formamide solution in a constant temperature oscillator. The influence of exfoliation on the thickness and surface structure of the Co(OH)2 monolith was analyzed by scanning electron microscopy and transmission electron microscopy. After the exfoliation process, the electrochemical performances of the 2D α-Co(OH)2 nanosheets were tested by cyclic voltammetry, galvanostatic discharge/charge, and electrochemical impedance spectroscopy. Impressively, the charge/discharge study shows that the exfoliated sample is capable of delivering a high specific capacitance of 952 F g–1 at a current density of 5 mA cm–2 and maintains 48 % of the capacitance when the current density is as high as 50 mA cm–2. In addition, the exfoliated Co(OH)2 nanosheets also exhibited excellent cycling stability and is an excellent electrode material for high-performance supercapacitors. Our work not only presents a cost-effective and scalable method for the synthesis of α-Co(OH)2 nanosheets with a high surface area, but also holds promise for the synthesis of a series of other graphene-like laminar structures with high specific surface areas for electrochemical energy storage, catalysis, gas sensing, and other applications.

Facile fabrication and electrochemical performance of flower-like Fe3O4@C@layered double hydroxide (LDH) composite

Abstract: A novel core–shell structured Fe3O4@C@Ni–Al LDH composite containing a carbon-coated Fe3O4 magnetic core and a layered double hydroxide (LDH) has been successfully prepared by a combination of the hydrothermal method and a facile in situ growth process. The Fe3O4@C@Ni–Al LDH microspheres were characterized by X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM and TEM), high-resolution transmission electron microscopy (HRTEM), Fourier transformed infrared (FT-IR), X-ray photoelectron spectra (XPS), and N2 adsorption/desorption methods. Owing to the unique layered feature, the composite displays core–shell structure with flower-like morphology, ultra-high surface area (792 m2 g−1) and specific pore size distribution. Moreover, the as-synthesized Fe3O4@C@Ni–Al LDH microsphere as an electrode material was fabricated into a supercapacitor and characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge–discharge measurements. It turned out that the Fe3O4@C@Ni–Al LDH exhibits specific capacitance of 767.6 F g−1, good rate capability, and remarkable cycling stability (92% after 1000 cycling). Therefore, such a novel synthetic route to assemble the high-performance electrochemical capacitor may open a new strategy to prepare other materials with largely enhanced electrochemical properties, which can be of great promise in energy storage device applications.

A Versatile Near Infrared Light Triggered Dual-Photosensitizer for Synchronous Bioimaging and Photodynamic Therapy

Abstract: Photodynamic therapy (PDT) based on Tm3+-activated up-conversion nanoparticles (UCNPs) can effectively eliminate tumor cells by triggering inorganic photosensitizers to generate cytotoxic reactive oxygen species (ROS) upon tissue penetrating near-infrared (NIR) light irradiation. However, the partial use of the emitted lights from UCNPs greatly hinders their application. Here we develop a novel dual-photosensitizer nanoplatform by coating mesoporous graphitic-phase carbon nitride (g-C3N4) layer on UCNPs core, followed by attaching ultrasmall Au25 nanoclusters and PEG molecules (named as UCNPs@g-C3N4–Au25-PEG). The ultraviolet–visible (UV–vis) light and the intensive near infrared (NIR) emission from UCNPs can activate g-C3N4 and excite Au25 nanoclusters to produce ROS, respectively, and thus realize the simultaneous activation of two kinds of photosensitizers for enhanced the efficiency of PDT mediated by a single NIR light excitation. A markedly higher PDT efficacy for the dual-photosensitizer system tha...