Beijing University of Technology

About: Beijing University of Technology is a education organization based out in Beijing, Beijing, China. It is known for research contribution in the topics: Microstructure & Computer science. The organization has 31929 authors who have published 31987 publications receiving 352112 citations. The organization is also known as: Běijīng Gōngyè Dàxué & Beijing Polytechnic University.

Ultrafine Pt Nanoparticles and Amorphous Nickel Supported on 3D Mesoporous Carbon Derived from Cu-Metal-Organic Framework for Efficient Methanol Oxidation and Nitrophenol Reduction.

Abstract: The development of novel strategy to produce new porous carbon materials is extremely important because these materials have wide applications in energy storage/conversion, mixture separation, and catalysis. Herein, for the first time, a novel 3D carbon substrate with hierarchical pores derived from commercially available Cu-MOF (metal-organic framework) (HKUST-1) through carbonization and chemical etching has been employed as the catalysts' support. Highly dispersed Pt nanoparticles and amorphous nickel were evenly dispersed on the surface or embedded within carbon matrix. The corresponding optimal composite catalyst exhibits a high mass-specific peak current of 1195 mA mg-1 Pt and excellent poison resistance capacity ( IF/ IB = 1.58) for methanol oxidation compared to commercial Pt/C (20%). Moreover, both composite catalysts manifest outstanding properties in the reduction of nitrophenol and demonstrate diverse selectivities for 2/3/4-nitrophenol, which can be attributed to different integrated forms between active species and carbon matrix. This attractive route offers broad prospects for the usage of a large number of available MOFs in fabricating functional carbon materials as well as highly active carbon-based electrocatalysts and heterogeneous organic catalysts.

Novel non-hydrazine solution processing of earth-abundant Cu2ZnSn(S,Se)4 absorbers for thin-film solar cells

Abstract: A novel non-hydrazine precursor solution followed by dip-coating has been developed to produce Cu2ZnSnS4 (CZTS) and Cu2ZnSn(S,Se)4 (CZTSSe) thin films. The precursor solution is based on an ethanol solution of metal–thioacetamide (TAA) complex with monoethanolamine (MEA) as the additive agent. By forming coordination complexes with TAA, metal cations are found to have good solubility in ethanol–MEA solvents, producing molecular-level blending in metal precursor solutions. All the materials are low-cost and environmentally friendly. The annealing treatments are conducted under vacuum and Se vapor to form CZTS and CZTSSe absorber films. A solar cell fabricated with the CZTSSe thin film exhibits power conversion efficiency of 5.36%, which is much higher than that (2.86%) of the cell using the CZTS thin film as absorber.

Methyl parathion sensors based on gold nanoparticles and Nafion film modified glassy carbon electrodes

Abstract: Gold nanoparticles were electrochemically deposited on a Nafion film coated glassy carbon electrode to prepare a sensor for determining methyl parathion. The electrochemica1 behaviours of methyl parathion at the sensor based on gold nanoparticles and Nafion film modified glassy carbon electrodes were studied by cyclic voltammetry. The microscopic network structure of Nafion provides so much scope that Au nanoparticles can infiltrate into it to enhance ionic and electronic conduction and makes them nanosized. Gold nanoparticles possess extreme small size, a high surface-to-volume ratio and high electrocatalytic activity towards the reduction of methyl parathion. The experimental parameters were optimized, and square wave voltammetry for determining methyl parathion was developed. The irreversible reduction peak current of methyl parathion was proportional to the concentration of methyl parathion over the range of 5.0 × 10−7 to 1.2 × 10−4 M with the detection limit of 1.0 × 10−7 M. The presented method was applied to determining methyl parathion in real samples of water and different vegetables. The sensors for methyl parathion exhibit high sensitivity and good reproducibility and are promising for fast, simple, and sensitive analysis of OPs in environmental and biological samples.