Dye-sensitized solar cells have been one of the most
promising photovoltaic devices due to their high conversion
efficiency and low cost. In general, a DSSC comprises a
dye-sensitized titanium dioxide (TiO2) electrode, an iodide/
triiodide redox electrolyte solution, and a counter electrode
(CE). The function of the CE is to transfer electrons from
the external circuit back to the redox electrolyte and to
catalyze the reduction of the triiodide ion [1–4]. Usually, a Pt
electrode formed on a transparent conductive glass substrate
is used as the CE for DSSC. Although Pt exhibits excellent
catalytic activity for triiodide reduction and good electric
conductivity, it is extremely expensive and has the problem of
reserves for large-scale application [5, 6]. Meanwhile, the
shape limitation will bring transport problem for the Pt
counter electrode. Future large solar electric conversion
systems will prefer materials abundantly available and easily
handled. Therefore, it is necessary to develop cheap materials
for CEs which also exhibit high electrical conductivity, good