Why Pt is used as counter electrodes in Dye sensitized solar cells

Why Pt is used as counter electrodes in Dye sensitized solar cells.What are the properties of Pt to be a electrode material. manythanks

Sounds like experimental convenience. Pt is chemically inert and has a very reliable chemical potential, which is not the case for other choices of electrodes. They may oxidize or form other unwanted chemical films which would cause systematic errors in the cell voltage measurement. A commercial dye sensitized cell with Pt electrodes is probably ruled out by economics. – CuriousOne Jun 14 '15 at 16:32 Sir,then if we try to find a alternative for Pt ,what are the properties we should looking for ,of the new material – Lakmal Jun 15 '15 at 15:58 The same as for platinum: chemical stability and low chemical potential. The cells I have seen seem to be based on Ti/TiO2 electrodes, a system that has been used for transparent electrodes for a long time. Generally, this is the kind of electrochemistry problem which makes it very hard to find suitable materials combinations for commercially viable products and I would be surprised to learn that a really competitive solutions exists. I have, at least so far, not seen any. – CuriousOne Jun 15 '15 at 17:18 thanks a lot sir – Lakmal Jun 16 '15 at 18:08 sir,if we develop a CE material for DSCs,should the electrode be 1)smooth or rough 2)thin or thick our new material has 6.5% efficiency when the same photo electrode gives 8.5% – Lakmal Jun 19 '15 at 15:31