J. Mater. Sci. Technol. ›› 2021, Vol. 60: 105-112.DOI: 10.1016/j.jmst.2020.05.020
• Research Article • Previous Articles Next Articles
Seung Woo Leea, Bongho Leea, Chaekyung Baika, Tae-Yang Kimb, Chanho Paka,b,*()
Received:
2020-03-31
Revised:
2020-05-20
Accepted:
2020-05-25
Published:
2021-01-10
Online:
2021-01-22
Contact:
Chanho Pak
Seung Woo Lee, Bongho Lee, Chaekyung Baik, Tae-Yang Kim, Chanho Pak. Multifunctional Ir-Ru alloy catalysts for reversal-tolerant anodes of polymer electrolyte membrane fuel cells[J]. J. Mater. Sci. Technol., 2021, 60: 105-112.
Sample | Nominal molar ratio (Ir:Ru) | Ir (at.%) | Ru (at.%) | Actual molar ratio (Ir:Ru) |
---|---|---|---|---|
IrRu4/C | 1:4 | 0.63 | 2.63 | 1:4.17 |
IrRu2/C | 1:2 | 0.79 | 1.72 | 1:2.18 |
IrRu/C | 1:1 | 0.72 | 0.76 | 1:1.06 |
Ir2Ru/C | 2:1 | 0.43 | 0.19 | 2.26:1 |
Ir4Ru/C | 4:1 | 1.60 | 0.44 | 3.64:1 |
Table 1 Compositions of IrRu/C catalysts determined by SEM-EDX.
Sample | Nominal molar ratio (Ir:Ru) | Ir (at.%) | Ru (at.%) | Actual molar ratio (Ir:Ru) |
---|---|---|---|---|
IrRu4/C | 1:4 | 0.63 | 2.63 | 1:4.17 |
IrRu2/C | 1:2 | 0.79 | 1.72 | 1:2.18 |
IrRu/C | 1:1 | 0.72 | 0.76 | 1:1.06 |
Ir2Ru/C | 2:1 | 0.43 | 0.19 | 2.26:1 |
Ir4Ru/C | 4:1 | 1.60 | 0.44 | 3.64:1 |
Fig. 6. Electrochemical properties of Ir-Ru-based catalysts. (a) OER activities before (solid line) and after (dashed line) the stability test. (b) Overpotential (mV, at 10 mA cm-2) for the OER before (black line) and after (red line) the stability test. (c) Tafel slopes for initial OER activity.
Fig. 7. Performance of single cells containing Ir-Ru-based anode catalysts and commercial PtCo/C as a cathode catalyst at 338 K and 50 % RH. (a) Plot of current density vs. voltage and (b) current density at 0.6 V extracted from the curve in (a) for different catalysts.
Fig. 8. RTA performance of MEAs containing Ir-Ru-based anode catalysts and commercial PtCo/C as a cathode catalyst at 338 K and 50 % RH. (a) Simulation of fuel starvation (cell reversal test), (b) comparison of catalyst durability (RTA performance).
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