of 2
Supplemental Information
Platinum
-decorated Carbon Nanotubes for Hydrogen Oxidation and Proton Reduction in
Solid Acid Electrochemical Cells
V. Sara Thoi
a
, Robert
E.
Usiskin
a
, and Sossina. M. Haile
a
Figure S1
. Schematic of the electrospray apparatus.
1
Figure S2.
TGA
profiles
of
30 (red) and 46 wt% (black)
Pt-CNTs
under a flow of
air, Ar, and
2.04% H
2
bal
at 200 mL min
-1
and a heating rate of 10
°C min
-1
. The negligible mass change (<
1%) upon switched from oxidizing
to reducing atmosphere indicates there is negligible formation
of PtO
x
.
Electronic
Supplementary
Material
(ESI)
for
Chemical
Science.
This
journal
is
©
The
Royal
Society
of
Chemistry
2014
Figure S3.
Cross
-sectional SEM analysis of a)
layered
-composite and b) co-
sprayed composite
of 30 wt% Pt-
CNT
-CsH
2
PO
4
from Strategies 1 and 2, respectively, illustrated in Scheme 2 in the
main text.
The straw
-like layer is the carbon paper electrode and the thin white layer is the
CsH
2
PO
4
-based electro
de.
Figure S4.
Symmetric cell impedance measurements of electrosprayed commercial CNTs (as
received). Measurements are performed at 240 °C in a dynamic atmosphere of 0.4 atm H
2
O and
balance H
2
supplied at a gas velocity of 6 cm min
-1
(inset: equivalent circuit used for fitting).
1.
A. Varga, N. A. Brunelli, M. W. Louie, K. P. Giapis and S. M. Haile,
J. Mater. Chem.
, 2010,
20
, 6309.