中科院纳米材料课件05
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2/H
2
O).
之所以能够作为一种很好的光催化剂(photocetalyst)是由于其能带结构特征造成的。TiO
2
满的价带
之间的禁带宽度E
g ~3.26eV 当它吸收的光子的能量
E
g
=3.2eV
Pt 的费米能级低于TiO 2 的费米能级，电子从TiO 2 向Pt 扩散
M. Haruta, Gold Bulletin
Before the reaction After the reaction
Langmuir , 21 (2005) 2027
JACS . 126 (2004) 7194
Nano Lett . 4 (2004) 1343
This study gives intriguing correlations between the kinetic parameters of the reaction and surface atom fraction in each shape
If the most reactive surface sites (corners, edges, defects) were productive, the AP sample might be expected to exhibit 40-fold enhanced rates, even without considering surface areas. However, CP-MgO exhibits at least a 6-fold higher rate for toluene benzylation. This observed trend was surprising in that the higher
•structure-insensitive and structure-sensitive.
•It was observed that the reaction rate was highest on the (1 1 1)
times higher than the rate on the (1 1 0) face and
D.W. Goodman,
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