Vein graphitebased counter electrodes for dyesensitized solar cells
· Graphite samples were collected from Bogala mine, Sri Lanka, and ballmilled, for 20 min, using a Pritsch Pulverisette 6 ballmilling instrument. The resulted powder was sieved to separate particles in the size range 45–63 μm. Then, ballmilled and sieved graphite powder was added to deionized water and subjected to continuous stirring.