Wuhan University of Technology

About: Wuhan University of Technology is a education organization based out in Wuhan, China. It is known for research contribution in the topics: Microstructure & Photocatalysis. The organization has 40384 authors who have published 36724 publications receiving 575695 citations. The organization is also known as: WUT.

Enhanced thermoelectric properties of Bi2(Te1−xSex)3-based compounds as n-type legs for low-temperature power generation

Abstract: The abundance of low-temperature waste heat necessitates the development of reliable and scalable thermal-to-electric energy conversion technology. The thermoelectric device is one viable option. Commercially available Bi2Te3-based materials are optimized for near room temperature cooling applications. Currently there are no mass-produced materials available for 400 K to 650 K thermoelectric power generation. We report the successful realization of high performance n-type Bi2(Te1−xSex)3-based materials for the temperature range of interest, using a commercial zone-melting technique. The introduction of Se effectively increases the band gap, which significantly suppresses the “turn-over” in Seebeck coefficient and the appearance of a pronounced bipolar effect, shifting the corresponding temperature of the optimum thermoelectric figure of merit ZT towards a higher temperature range. Furthermore, we demonstrate that the electron concentration of Bi2(Te0.5Se0.5)3 can be effectively adjusted by iodine doping. The samples with electron concentrations between 3 × 1019 and 4.5 × 1019 cm−3 display optimal thermoelectric performances. The highest ZT value reaches 0.86 at 600 K for the sample with the electron concentration of 4.0 × 1019 cm−3, whose average ZT between 400 K and 640 K is 0.8, making this scalable zone-melted low-Te content Bi2(Te0.5Se0.5)3 compound a promising candidate for low-temperature power generation.

Task scheduling in cloud computing based on hybrid moth search algorithm and differential evolution

Abstract: This paper presents an alternative method for cloud task scheduling problem which aims to minimize makespan that required to schedule a number of tasks on different Virtual Machines (VMs). The proposed method is based on the improvement of the Moth Search Algorithm (MSA) using the Differential Evolution (DE). The MSA simulates the behavior of moths to fly towards the source of light in nature through using two concepts, the phototaxis and Levy flights that represent the exploration and exploitation ability respectively. However, the exploitation ability is still needed to be improved, therefore, the DE can be used as local search method. In order to evaluate the performance of the proposed MSDE algorithm, a set of three experimental series are performed. The first experiment aims to compare the traditional MSA and the proposed algorithm to solve a set of twenty global optimization problems. Meanwhile, in second and third experimental series the performance of the proposed algorithm to solve the cloud task scheduling problem is compared against other heuristic and meta-heuristic algorithms for synthetical and real trace data, respectively. The results of the two experimental series show that the proposed algorithm outperformed other algorithms according to the performance measures.

The pulsed laser-induced Schottky junction via in-situ forming Cd clusters on CdS surfaces toward efficient visible light-driven photocatalytic hydrogen evolution

Abstract: Herein, we developed one simple and novel post-treatment technique via pulsed laser irradiation of CdS (L-CdS) semiconductor to significantly enhance the visible light-driven hydrogen evolution performance from water splitting, during which the rate of hydrogen evolution over L-CdS in the first hour is 40-times than that of pure CdS. Because the pulsed laser irradiation induces the in-situ formation of metallic Cd clusters on CdS surface to construct the Schottky junction between Cd clusters and CdS, obviously facilitating the electron transfer from excited CdS into Cd to endow more photogenerated electrons for enhancing the photocatalytic efficiency of H2 evolution. Moreover, the bandgap narrow of post-treated CdS also benefits the stronger light absorption for enhancing the photocatalytic efficiency. This work may provide a new approach to develop heterojunction-based photocatalysts for efficient solar-to-chemical conversion.

Designing Polymer-in-Salt Electrolyte and Fully Infiltrated 3D Electrode for Integrated Solid-State Lithium Batteries.

Abstract: Solid-state lithium batteries (SSLBs) are promising owing to enhanced safety and high energy density but plagued by the relatively low ionic conductivity of solid-state electrolytes and large electrolyte-electrode interfacial resistance. Herein, we design a poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP)-based polymer-in-salt solid electrolyte (PISSE) with high room-temperature ionic conductivity (1.24×10-4 S cm-1 ) and construct a model integrated TiO2 /Li SSLB with 3D fully infiltration of solid electrolyte. With forming aggregated ion clusters, unique ionic channels are generated in the PISSE, providing much faster Li+ transport than common polymer electrolytes. The integrated device achieves maximized interfacial contact and electrochemical and mechanical stability, with performance close to liquid electrolyte. A pouch cell made of 2 SSLB units in series shows high voltage plateau (3.7 V) and volumetric energy density comparable to many commercial thin-film batteries.