The objective of this research is an in-depth exploration of semiconductor photo-catalysts that are able to convert CO2 and H2O and sunlight to energy rich and transportable fuels, such as CH4, CH3OH and HCO2H. The main focus is on the synthesis, structure determination, physical property characterization and photocatalytic testing of different classes of semiconductor photo-catalysts, with and...

The photoexcited electron injection dynamics of free-base and metallo-derivatives of tris(pentafluorophenyl)porphyrins bound to TiO2 and SnO2 nanoparticle surfaces have been investigated using timeresolved terahertz spectroscopy (TRTS). The metallo-derivatives include Zn(II), Cu(II), Ni(II), and Pd(II). For the TiO2−porphyrin assemblies, electron injection from the photoexcited dye to the semic...

Conductive and transparent multilayer thin films consisting of three alternating layers (TiO2/Ag/SiO2, TAS) have been fabricated for applications as transparent conducting oxides. Metal oxide and metal layers were prepared by electron-beam evaporation with ion-assisted deposition, and the optical and electrical properties of the resulting films as well as their energy bounding characteristics a...

Chalcocite (Cu2S) has been deposited via pulsed chemical vapor deposition (PCVD) into a porous TiO2 matrix using hydrogen sulfide and a metal-organic precursor. The precursor used is similar to the more common Cu(hfac)(tmvs) precursor, but it is fluorine free and exhibits increased thermal stability. The simultaneous exposure of the substrate to the copper precursor and hydrogen sulfide resulte...

The water–gas shift (WGS) activity of Pt/TiO2-based powdered and structured catalysts was investigated using realistic feed compositions that are relevant to the high-temperature (HTS) low-temperature (LTS) reaction conditions. promotion TiO2 support with small amounts alkali- or alkaline earth-metals resulted in enhancement WGS 0.5%Pt/TiO2(X) (X = Na, Cs, Ca, Sr). use bimetallic (Pt–M)/TiO2 (M...

Abstract This project attempts to evaluate the effect of nanofluids on thermal performance and economic parameters shell tube heat exchangers. First, two thermodynamic processes including combined power (CHP) system solar-driven organic Rankine cycle (ORC) are simulated using Aspen HYSYS. The CHP ORC systems can produce 25 MW 175.8 kW electrical power, respectively. Thereafter, use in exchanger...

In this study, the two-dimensional Magnetohydrodynamic (MHD) boundary layer of stagnation-point flow in a nanofluid in the presence of thermal radiation is investigated. Using a similarity transform, the NavierStokes equations are reduced to a set of nonlinear ordinary differential equations. The similarity equations are solved numerically for three types of nanoparticles, namely copper (Cu), a...