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Boosting Pt Utilization via PtTe2 Nanoshells for Direct Methanol Fuel Cells
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DOI：10.1002/aenm.71162.png)
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Abstract
En 中文
Boosting Pt efficiency for direct methanol fuel cells is the key to pushing methanol-economic sustainable development. Herein, ultrathin PtTe2 nanoshells grown on Te nanorods (Te@PtTe2) were found to be highly efficient for electrochemical methanol energy conversion in fuel-cell devices. This unique core–shell structure imparts the catalyst with high active edge sites exposure and high Pt utilization efficiency, but with low Pt loading of 5 wt.%. The peak mass activity of about 3.4 A mgPt−1 was more than 16 and 6 times that of the commercial Pt/C and PtRu/C (both 20 wt.% Pt). Fundamentally, in situ spectroscopic studies and theoretical calculations reveal that the PtTe2 shells can facilitate a predominantly direct pathway with HCOOH as the intermediate for methanol oxidation by reducing the CO poisoning effect largely. Practically, this catalyst achieved a peak power density of 1.5 W mgPt−1, which is about 6.0 and 8.8 times that of PtRu/C (0.25 W mgPt−1) and Pt/C (0.17 W mgPt−1)-based counterparts, respectively. The work offers a promising platform for cost-effective clean energy conversion by increasing the Pt intrinsic activity and utilization, but with low Pt loading.
Keywords:
direct methanol fuel cell
direct pathway
methanol oxidation reaction
PtTe2
Journal
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26
Papers:
1.0W
Citations:
15.7W