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19(C)). 19A The schematic of a cross section of an alkaline battery and its redox reactions. 19B & C Three-dimensional representation of common battery design, (B) The Lead-acid battery and its redox reaction; and (C) The lithium battery and its redox reaction. 4 Nanocatalysis Nanocatalysis is a field to use nanomaterials to speed up chemical reactions dramatically. For example, the metal nanocatalyst can display high catalyticity processing due to their ultrahigh surface areas therefore these metals will increase catalytic reaction.

The back contact of a cell (on the side away from the incoming sunlight) usually consists of a layer of aluminum or molybdenum metal to allow the flow of electrons. The front contact (on the side facing the sun) is more complicated than the back contact. To restate, when sunlight hits on the PV cell, a current of electrons flows through the entire surface [105,106]. Increased contact surface area will help to decrease the electrical resistance of the top semiconductor layer. Therefore, electrical contacts across the entire surface of a PV cell must be placed in order to collect the most current.

35 (7) (2006) 583e592. V. Salata, Applications of nanoparticles in biology and medicine, J. Nanobiotechnol. 2 (1) (2004) 3. W. Schultze, A. Bressel, Principles of electrochemical micro-and nano-system technologies, Electrochim. Acta 47 (1) (2001) 3e21. S. Brazel, Magnetothermally-responsive nanomaterials: combining magnetic nanostructures and thermally-sensitive polymers for triggered drug release, Pharm. Res. 26 (3) (2009) 644e656. S. Kumar, Magnetic Nanomaterials, vol. 4, John Wiley & Sons, 2009.

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