Performance evaluation of nickel as anode catalyst for DMFC in acidic and alkaline medium
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Abstract: Direct methanol fuel cell (DMFC) research is highly focused due to its high energy density, portability and inexpensive. In the present study conventional platinum catalyst used for methanol oxidation is being replaced with nickel catalyst supported over nickel mesh. The electrode is synthesized by single step electro deposition technique. Synthesized electrode was characterized by SEM, EDAX and AFM techniques to know the surface morphology, composition and thickness of the catalyst respectively. The electro catalytic behavior of the nickel for methanol oxidation was evaluated using cyclic voltammetry technique. As the DMFC is compatible with both the acidic and alkaline electrolytes the working of the nickel mesh electrode is analyzed in both media. The results showed maximum current density of 0.025 and 0.030 A/cm2 in alkaline and acidic medium respectively with less potential around 0.4 and 0.2 V. The other parameters such as varying the concentration of methanol, electrolyte medium, scan rate and thickness of the catalytic layer were analyzed and optimized.
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Key words:
- direct methanol fuel cell /
- electro oxidation /
- catalytic activity /
- electrolyte medium
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Figure 1 (a) cyclic voltammogram of bare nickel mesh electrode in acidic medium without methanol; (b)SEM micrographs of the Ni coated Ni mesh for 10 min by galvanostatic method; (c)EDX of the Ni coated Ni mesh
Figure 2 Cyclic voltammogram for methanol oxidation in 0.5 mol/L H2SO4 /(0.5-1.5) mol/L methanol at a scan rate of 0.1 V/s without purging of N2
Figure 4 Cyclic voltammogram for methanol oxidation on varying the concentration of methanol from 0.5 mol/L to 2 mol/L in 0.5 mol/L H2SO4 at a scan rate of 0.1 V/s
Figure 5 (a) Activation of Ni coated electrode in 0.5 mol/L NaOH solution at the scan rate of 0.1 V/s; (b) Cyclic voltammogram for methanol oxidation on varying the concentration of methanol from 0.5 to 2 in 0.5 mol/L NaOH at a scan rate of 0.1 V/s
Figure 6 Plot of methanol concentration vs peak current density in 0.5 mol/L acidic and alkaline medium at scan rate of 0.1 V/s
Figure 7 Influence of varying the concentration of H2SO4 (a) and NaOH (b) at a scan rate of 0.1 V/s in presence of 1.5 mol/L methanol
Figure 8 Cyclic voltammogram at different scan rates starting from 0.1 to 0.4 V/s in ((a), (b)) 0.5 mol/L H2SO4; and ((c), (d)) 0.5 mol/L NaOH in presence of 1.5 mol/L methanol
Figure 9 Influence of the thickness of the catalytic layer for MOR in presence of 1.5 mol/L methanol/ 0.5 mol/L H2SO4 at a scan rate of 0.1 V/s
Figure 10 Influence of the thickness of the catalytic layer for MOR in presence of 1 mol/L methanol/ 0.5 mol/L NaOH at a scan rate of 0.1 V/s
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