Journal
ADVANCED MATERIALS
Volume 33, Issue 41, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202103762
Keywords
decoupling mechanism; electrocatalysis; methanol oxidation reaction; surface decoration; ultrathin nanowires
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Funding
- Beijing Natural Science Foundation [JQ18005]
- National Science Fund for Distinguished Young Scholars [52025133]
- Tencent Foundation through the XPLORER PRIZE
- National Key R&D Program of China [2017YFA0206701]
- National Natural Science Foundation of China [22002003, 51871078, 52071119]
- China Postdoctoral Science Foundation [2020M670020]
- US National Science Foundation [DMR1828019]
- BIC-ESAT fund
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This study demonstrates a new strategy to fabricate platinum nanowires that effectively eliminate CO poisoning, leading to enhanced methanol oxidation electrocatalysis. The optimized nanowires show high specific and mass activity, as well as improved stability, and also exhibit superior activities towards the electro-oxidation of other alcohols.
A crucial issue restricting the application of direct alcohol fuel cells (DAFCs) is the low activity of Pt-based electrocatalysts for alcohol oxidation reaction caused by the reaction intermediate (CO*) poisoning. Herein, a new strategy is demonstrated for making a class of sub-monolayer YOx/MoOx-surface co-decorated ultrathin platinum nanowires (YOx/MoOx-Pt NWs) to effectively eliminate the CO poisoning for enhancing methanol oxidation electrocatalysis. By adjusting the amounts of YOx and MoOx decorated on the surface of ultrathin Pt NWs, the optimized 22% YOx/MoOx-Pt NWs achieve a high specific activity of 3.35 mA cm(-2) and a mass activity of 2.10 A mg(Pt)(-1), as well as the enhanced stability. In situ Fourier transform infrared (FTIR) spectroscopy and CO stripping studies confirm the contribution of YOx and MoOx to anti-CO poisoning ability of the NWs. Density functional theory (DFT) calculations further reveal that the surface Y and Mo atoms with oxidation states allow COOH* to bind the surface through both the carbon and oxygen atoms, which can lower the free energy barriers for the oxidation of CO* into COOH*. The optimal NWs also show the superior activities toward the electro-oxidation of ethanol, ethylene glycol, and glycerol.
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