Experimental Study on Combustion Characteristics for Polyurethane-aluminum Composite Insulation Material under Different Heat Fluxes

AbstractThe decorative materials with external insulation release a large amount of smoke and heat in fires, and cause severe hazard and losses to human beings and properties. In this paper, the combustion characteristics of polyurethane-aluminum composite material, including ignition time, heat release rate, mass loss rate, concentration of gas components and other parameters, are studied and analyzed under six different heat fluxes, namely 25, 30, 35, 40, 45 and 50kW/m2, with cone calorimeter to investigate the combustion performance of the material. The results show that the heat release rate reaches a minimum value under a flux of about 30kW/m2. The curve trends of CO and CO2 concentrations, mass loss rate and heat release rate over time are similar, whereas the concentration of O2 changes inversely. Based on the experimental data, the classic formula between ignition time and radiation heat flux of thermally thick material can be used to predict the pyrolysis process of polyurethane-aluminum composite materials successfully, but the critical heat flux cannot be predicted

Fabrication and photoelectrochemical study of selenide and oxide heterostructures for solar hydrogen evolution

We report the synthesis and photoelectrochemical (PEC) studies of a novel CdSe/BiVO4 planar heterojunction photoelectrodes for photoelectrochemical water splitting fabricated by chemical bath deposition of CdSe on the spin-coated BiVO4 layers. Temperature and time of chemical bath deposition were investigated to obtain the optimal deposition condition. The optimized CdSe/BiVO4 with enhanced photo absorption yielded a maximum photocurrent density of 2.48 mA under the irradiation of AM 1.5 G (100 mW/cm2) simulated solar light illumination, which is enhanced by 3.87 times compared to bare BiVO4

Fabrication and photoelectrochemical study of selenide and oxide heterostructures for solar hydrogen evolution

We report the synthesis and photoelectrochemical (PEC) studies of a novel CdSe/BiVO4 planar heterojunction photoelectrodes for photoelectrochemical water splitting fabricated by chemical bath deposition of CdSe on the spin-coated BiVO4 layers. Temperature and time of chemical bath deposition were investigated to obtain the optimal deposition condition. The optimized CdSe/BiVO4 with enhanced photo absorption yielded a maximum photocurrent density of 2.48 mA under the irradiation of AM 1.5 G (100 mW/cm2) simulated solar light illumination, which is enhanced by 3.87 times compared to bare BiVO4.</jats:p