Page 115 - 00. Complete Version - Progress Report IPEN 2014-2016

Renewable Energies | Progress Report 115

PtAu Electrocatalyst Alchol/Air Cathode
Colector
Single Fuel Cell
for Glycerol Oxidation
Reaction Using a ATR-
FTIR/Single Direct Al-
Support
kaline Glycerol/Air Cell
In Situ Study (Fig. 9).
MEA
Pt/C
PtAu/C 90.10 ATR Plate
PtAu/C 70.30 Anode
PtAu/C 50.50 Colector
Au/C

Figure 9. Polarization 0.60 0.55
curves of single direct al- 0.50
kaline glycerol/air cell for 0.50 0.45
Pt/C, Au/C, and PtAu/C metal 0.40
electrocatalysts at atom- 0.40 0.35
ic ratios 90:10, 70:30, and Current (µA) 0.30 0.30
50:50. (C) ATR-FTIR/alco- P / mW mg -1 0.25
hol/airsingle cell setu. 0.20 0.20
0.15
0.10 0.10
0.05
0 0
0 1.0 2.0 3.0 4.0 5.0 0 1.0 2.0 3.0 4.0 5.0

Pt/C 30.70 Synthesis Time
Synthesis of Pt t = 0 10 min 25 min 45 min 3h
nanoparticles with EG/H 2O
Carbon H 2PtCl 6 KBr H 2PtCl 6 Pt/C 30.70
preferential (100) Support 30 wt% 70 wt%
orientation di-
rectly on the car-
bon support for Di-
rect Ethanol Fuel
Cell (Fig. 10). 5 min before 10 min afer 10 min afer the after 3h
KBr addition KBr addition remainder Pt of synthesis
source addition
Figure 10. CVs of Pt/C elec- Morphology Changes
trocatalysts prepared
with Br -:Pt ratio of 300 Pt/C Pt/C Pt/C Pt/C Pt/C Pt/C
under different condi- 30.70 70.30 90.10 100 30.70
tions: (a) H2SO4 0.5 mol 40
L-1 electrolyte and scan 100
rate of 50 mV s-1 and (b)
ECSA loss with CV cycling. 20 96
(c) Morphology develop-
ment of Pt/C 30.70 elec- 92
trocatalyst (collected at Current (µA) 0 Current (µA)
different synthesis times 88
and analyzed by TEM). -20
84
-40
0 0.2 0.4 0.6 0.8 0 100 200 300 400 500
Potential vs RHE (V) CV cycle