Chemistry Reference
In-Depth Information
Fig. 20 The optimized structures for intermediates of the oxygen evolution on (a) the
outside wall of TiO
2
NTs and (b) TiO
2
NTAs.
80
Fig. 21 Compared free energies for intermediates of the oxygen evolution on the
(a) outside and (b) inside wall of the pure TiO
2
NTs, and (c) on the TiO
2
NTAs at
three potentials (relative to the standard hydrogen electrode): zero potential (U
=
0V),
the equilibrium potential (U
=
1.23 V) and the lowest potential (U
=
1.68, 2.23 and 2.36 V,
respectively) at which all steps are downhill in free energy.
