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1
Supplementary
Information
Efficient Solar Hydrogen Generation in Microgravity
Environment
Brinkert et al.
2
Supplementary
Figure
1
|
Chronoamperometric measurements in microgravity environments.
Chronoamperometric
measurement of the thin film (cyan) and nanostructured (yellow) p
-
InP
-
Rh
photoelectrodes in microgravity environment (10
-
6
g) at 70 mW/cm
2
illumination with a W
-
I lamp in 1 M
HClO
4
with the addition of 1 % (v/v) isopropanol at an applied potential of
-
0.09V vs. RHE.
The applied
potential was set to
-
0.09V vs RHE.
The increased signal
-
to
-
noise ratio at the end of the measurements
is
due to
the
deceleration of the drop capsule
after 9
.3s
.
J
(mA

cm
-
2
)
time (s)
3
Supplementary
Figure
2
|
HRTEM images of the nanostructured photoelectrode.
a
-
c
HRTEM images
of
a rhodium
grain from the nanostructured photoelectrode at different magnifications.
The scale
bars indicate
the resolution of
5nm (
a
), 2nm (
b
) and 0.5 nm (
c
)
, respectively
.
d
2D
-
Fourier Transformation
image
showing
the corresponding diffraction pattern
with
a lattice plane spacing of 2.2 Å
hkl
111, which is
typical
for cubic structures.
0
nm510152025
303540
0
5
10
15
20
25
30
35
0
nm246
810
0
2
4
6
8
10
0.0
nm0.51.01.52.02.5
0.0
0.5
1.0
1.5
2.0
2.5
1/
!
.
!
Å
a
b
c
d
[III
]