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Issue 29, 2015
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Shape-controlled porous heterogeneous PtRu/C/Nafion microspheres enabling high performance direct methanol fuel cells

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Abstract

An anode catalytic layer for direct methanol fuel cells (DMFCs) with decreased PtRu loading as low as 1.0 mg cm−2 has been prepared by an electrospray method. The morphology of the electrosprayed composite of PtRu/C/Nafion/polyethylene oxide (PEO) is altered from irregular particles to porous microspheres and to nanofibers by adjusting the PEO content. A hybrid structure is assembled using the porous microspheres as the anode catalytic layer for DMFCs, leading to a remarkable enhancement in the maximum power density of 35.4 mW cm−2, which is ∼50% higher than that of the conventional one at the same PtRu loading of 1.0 mg cm−2 and is even comparable to that (31.5 mW cm−2) of the conventional one at a higher PtRu loading of 2.0 mg cm−2. Further investigation reveals that the improved performance is mainly attributed to its hierarchical factual structure. In the primary structure, a single microsphere is with well-distributed PtRu/C and is fully rich in nano-pores and nano-channels, resulting in an increase in the electrochemical active surface area and higher catalyst utilization. In the secondary structure, micro-sized pathways are formed by the stereoscopic microspheres, resulting in enhanced mass transport, higher current density and power density.

Graphical abstract: Shape-controlled porous heterogeneous PtRu/C/Nafion microspheres enabling high performance direct methanol fuel cells

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Article information


Submitted
11 Apr 2015
Accepted
12 Jun 2015
First published
12 Jun 2015

J. Mater. Chem. A, 2015,3, 15177-15183
Article type
Paper
Author version available

Shape-controlled porous heterogeneous PtRu/C/Nafion microspheres enabling high performance direct methanol fuel cells

Q. Cheng, Y. Wang, J. Jiang, Z. Zou, Y. Zhou, J. Fang and H. Yang, J. Mater. Chem. A, 2015, 3, 15177
DOI: 10.1039/C5TA02627J

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