PtCo/rGO nano-anode catalyst: enhanced power density with reduced methanol crossover in direct methanol fuel cell

被引：27
作者：
Baronia R. [1 ,2 ]
Goel J. [2 ]
Kaswan J. [1 ,2 ]
Shukla A. [1 ,2 ]
Singhal S.K. [2 ]
Singh S.P. [1 ,2 ]
机构：
[1] AcSIR-Academy of Scientific and Innovative Research, CSIR-National Physical Laboratory Campus, New Delhi
[2] CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi
来源：
Materials for Renewable and Sustainable Energy | 2018年 / 7卷 / 04期
关键词：
Fuel efficiency; Methanol oxidation; PtCo nano-particles; Reduced graphene oxide (rGO);
D O I：
10.1007/s40243-018-0134-8
中图分类号：
学科分类号：
摘要：
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/cm2 and a power density of 136.8 mW/cm2 were achieved using PtCo (1:9)/rGO anode catalyst in a complete DMFC set-up at 100 °C with 5 M methanol supply which is ~ three times greater as compared to commercial Pt/C (48.03 mW/cm2). 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. © 2018, The Author(s).
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