Journal
MATERIALS FOR RENEWABLE AND SUSTAINABLE ENERGY
Volume 7, Issue 4, Pages -Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s40243-018-0134-8
Keywords
PtCo nano-particles; Reduced graphene oxide (rGO); Methanol oxidation; Fuel efficiency
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Funding
- Council of Scientific & Industrial Research, India [P-81-103]
- DST-INSPIRE [IFA-15/ENG107]
- SERB-DST [ECR/2017/000302]
- NanoSHE [BSC0112]
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The higher methanol utilization efficiency in direct methanol fuel cell (DMFC) is one of the key factors that determine the performance of DMFC. Herein, we have synthesized bimetallic PtCo nano-particles (with optimized Pt:Co ratio) decorated reduced graphene oxide (rGO) nano-composite as anode catalyst. The electrochemical response of optimized PtCo (1:9)/rGO catalyst revealed efficient oxidation of 5 M methanol in half-cell configuration with 60% Faradaic efficiency. A current density of 463.5 mA/cm(2) and a power density of 136.8 mW/cm(2) were achieved using PtCo (1:9)/rGO anode catalyst in a complete DMFC set-up at 100 A degrees C with 5 M methanol supply which is three times greater as compared to commercial Pt/C (48.03 mW/cm(2)). The low activation energy of 9.88 kJ/mol indicates the faster methanol oxidation reduction (MOR) kinetics of PtCo (1:9)/rGO anode catalyst. Furthermore, the higher methanol utilization and open-circuit voltage in complete DMFC using PtCo (1:9)/rGO as compared to commercial Pt/C indicate the reduced methanol crossover. The excellent catalytic behavior of PtCo (1:9)/rGO towards MOR and high methanol utilization warrant its potential application as anode catalyst in DMFC.
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