58
C. Juhong et al.
Fig. 3.9 Catalyst film
obtained by static drying
method. Reprinted from ref.
[17], copyright©2010
American Chemical Society,
with permission from
American Chemical Society
slurry is dispersed very uniformly, it is possible to obtain a catalyst film having a
relatively uniform surface dispersion state.
Figure 3.10a is a CV curve of a Pt/C catalyst of different film-forming qualities.
It can be seen from the figure that due to the difference in film formation quality,
the CV curves obtained by the same catalyst under the same test conditions are
greatly different. Whether it is the size of the absorption and desorption peak of
hydrogen or the formation position of Pt–OH, the difference is different. As can be
seen from Fig. 3.10b, the oxygen reduction polarization curves are quite different.
For electrodes with better film formation quality, the slope of the polarization region
is larger. In the diffusion control region, the electrode with better film formation
quality can obtain a larger limiting current. This is because the electrode with good
film formation quality is more conducive to the uniform diffusion of oxygen and
electrolyte on its surface.
It can be seen from Fig. 3.11 that the catalyst film obtained by the static drying
method has better film formation uniformity at the edge portion, and the thickness of
the central portion is significantly thicker, and some central regions are not completely
C. Juhong et al.
Fig. 3.9 Catalyst film
obtained by static drying
method. Reprinted from ref.
[17], copyright©2010
American Chemical Society,
with permission from
American Chemical Society
slurry is dispersed very uniformly, it is possible to obtain a catalyst film having a
relatively uniform surface dispersion state.
Figure 3.10a is a CV curve of a Pt/C catalyst of different film-forming qualities.
It can be seen from the figure that due to the difference in film formation quality,
the CV curves obtained by the same catalyst under the same test conditions are
greatly different. Whether it is the size of the absorption and desorption peak of
hydrogen or the formation position of Pt–OH, the difference is different. As can be
seen from Fig. 3.10b, the oxygen reduction polarization curves are quite different.
For electrodes with better film formation quality, the slope of the polarization region
is larger. In the diffusion control region, the electrode with better film formation
quality can obtain a larger limiting current. This is because the electrode with good
film formation quality is more conducive to the uniform diffusion of oxygen and
electrolyte on its surface.
It can be seen from Fig. 3.11 that the catalyst film obtained by the static drying
method has better film formation uniformity at the edge portion, and the thickness of
the central portion is significantly thicker, and some central regions are not completely