4.8 Article

Hexagonal PtBi Intermetallic Inlaid with Sub-Monolayer Pb Oxyhydroxide Boosts Methanol Oxidation

Journal

SMALL
Volume 18, Issue 14, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202107803

Keywords

electrocatalysis; intermetallic; methanol oxidation; Pb oxyhydroxide

Funding

  1. National Natural Science Foundation of China (NSFC) [52101259, 21771156]
  2. National Key R&D Program of China [2021YFA1501101]
  3. Guangdong Science and Technology Department [2016ZT06C279]
  4. Shenzhen Science and Technology Innovation Committee [KQTD2016053019134356]
  5. National Natural Science Foundation of China/RGC Joint Research Scheme [N_PolyU502/21]
  6. Hong Kong Polytechnic University [1-ZE2V]

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The surface inlay of sub-monolayer Pb oxyhydroxide onto hexagonal PtBi intermetallic nanoplates can enhance the activity of methanol oxidation reaction, providing an effective nanoengineering strategy.
Engineering multicomponent nanocatalysts is effective to improve electrocatalysis in many applications, yet it remains a challenge in constructing well-defined multimetallic active sites at the atomic level. Herein, the surface inlay of sub-monolayer Pb oxyhydroxide onto hexagonal PtBi intermetallic nanoplates with intrinsically isolated Pt atoms to boost the methanol oxidation reaction (MOR) is reported. The well-defined PtBi@6.7%Pb nanocatalyst exhibits 4.0 and 7.4 times higher mass activity than PtBi nanoplates and commercial Pt/C catalyst toward MOR in the alkaline electrolyte at 30 degrees C. Meanwhile, it also achieves a record-high mass activity of 51.07 A mg(Pt)(-1) at direct methanol fuel cells operation temperature of 60 degrees C. DFT calculations reveal that the introduction of Pb oxyhydroxide on the surface not only promotes the electron transfer efficiency but also suppresses the CO poisoning effect, and the efficient p-d coupling optimizes the electroactivity of PtBi@6.7%Pb nanoplates toward the MOR process with low reaction barriers. This work offers a nanoengineering strategy to effectively construct and modulate multimetallic nanocatalysts to improve the electroactivity toward the MOR in future research.

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