Browsing by Author "Singh, K."

Now showing 1 - 3 of 3
  • No Thumbnail Available
    Item
    Operating Characteristics of Proton-Exchange-Membrane (PEM) Fuel Cells
    (European Journal of Scientific Research, 2008-04) Tamakloe, Reuben Y.; Singh, K.; Linkous, Clovis A.; 0000-0002-5563-5930
    The H2-O2 fuel cells in which solar hydrogen and oxygen supplied to the anode side and cathode side of the cell respectively were fabricated and the two sides of the cells were separated by a proton-exchange-membrane (PEM) which allowed the passage of hydrogen ions H+ but not the oxygen O2. The operating characteristics of two fuel cells, Al-C/Pt- PEM-C/Pt-Al and Al-C/Pt-PEM-C/Pt-Cu were plotted and internal resistance as well as the efficiency of these cells were computed and compared. It was found that Al-C/Pt-PEMC/ Pt-Cu cell did not clearly exhibit mass transport over-potential, while it was clearly observable for Al-C/Pt-PEM-C/Pt-Al cell.
  • No Thumbnail Available
    Item
    Photovoltaic-Stand-Alone Hydrogen System
    (European Journal of Scientific Research, 2008-04) Tamakloe, Reuben Y.; Singh, K.; 0000-0002-5563-5930
    A photovoltaic system consists of an array, a storage medium and elements for power conditioning. Many photovoltaic systems operate in a stand-alone mode and the total energy demand is met by the output of the photovoltaic array. The output of the photovoltaic system fluctuates and is unpredictable for many applications making some forms of energy storage or backup system necessary. The role of storage medium is to store the excess energy produced by the photovoltaic array, to absorb momentary power peaks and to supply energy during sunless periods or during night. One of the storage modes is the use of electrochemical techniques, with batteries and water electrolysis as the most important examples. In this paper, we report the optimal design for a stand-alone hydrogen system with the volume of hydrogen produced against current as regards the concentration of electrolysis cell. Operating characteristics of a small capacity solar hydrogen system have been determined and also demonstrated that the I-V characteristics of the batteryphotovoltaic module and electrolysis cell are influenced by variations in the concentration of the electrolysis cell, which in turn determines the amount of current that flows through it. A 50W photovoltaic panel rated as 17.4V, 2.87A yielded a maximum volume of about 8.6ml per minute for 1.0M cell concentration. Numerical simulation was used to compare the experimental results and also the possibility of increasing the cost-effective yield of hydrogen.
  • No Thumbnail Available
    Item
    POWER OUTPUT OF A1/SnO2/n-Si SOLAR CELL
    (Pergamon, 1996) Tamakloe, Reuben Y.; Singh, K.; 0000-0002-5563-5930
    An Al/SnO2/n-Si solar cell from n-type silicon (6.5 f~-cm, (100)) wafers using chemical vapour deposition (CVD) has been fabricated. The fabrication details, I-V characteristics determining conversionefficiency (r/max), open circuit voltage (Voc) and short circuit current (lsc) have been presented. A maximum conversion efficiency of 6.3% for an unencapsulated cell of area 85.20 mrn 2 has been obtained