Volume 5, Issue 1, January 2013
Index of content:
We report on the photosensitization of electrodeposited ZnO nanowire arrays with CuInS2 (CIS) extremely thin layers prepared by two methods: successive ionic layer adsorption and reaction (SILAR) and electrochemical deposition (ECD). This is the first time that such core (ZnO)/shell (CIS) nanostructures are realized. Using SILAR method, 20 nm thick films composed of CIS nanoparticles are grown after 15 deposition cycles. The final layer thickness when prepared by SILAR technique depends on the number of deposition cycles and is used as a main parameter to control it. For the electrodeposited CIS films the passed charge density during deposition is used for monitoring the film thickness. These room-temperature solution based methods (SILAR and ECD) appear to be very suitable for preparing good quality, thin uniform (in nanometer scale) films of absorbing materials.
Biomass gasification or combustion for generating electricity in Spain: Review of its current situation according to the opinion of specialists in the field5(2013); http://dx.doi.org/10.1063/1.4792605View Description Hide Description
This paper seeks to set out the problems of biomass-based electricity generation according to the opinions of specialists in the sector with considerable experience both in the undertaking of projects involving the management and operation of facilities, and in research projects involving combustion and gasification technologies. The aim is to analyse both technologies and decide which is the more suitable and in what circumstances, and to describe the technological and circumstantial problems each one currently faces. In general, it is stressed that these two technologies are still in their infancy, and they require major efforts in research, although the first fruits are already being gathered for each one at an appropriate scale. Some experts recommend using the gasification technique in plants with an installed electric power of between 0.5 and 2 MWe, while in plants between 2 and 10 MWe combustion is considered to be more reliable. A key factor in the viability of both types of facilities is the need to increase operating times. The estimated requirement is 7000 to 8000 operating hours, which is well above the current figure. A common problem with both technologies is biomass logistics. This is a factor that needs to be taken very much into account when conducting a feasibility study on a facility.