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Ordered PtPb/Pt Core/Shell Nanodisks as Highly Active, Selective, and Stable Catalysts for Methanol Reformation to H 2
Author(s) -
E Bin,
Shao Qi,
Bu Lingzheng,
Bai Shuxing,
Li Yujing,
Huang Xiaoqing
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201703430
Subject(s) - x ray photoelectron spectroscopy , bimetallic strip , materials science , catalysis , fourier transform infrared spectroscopy , methanol , chemical engineering , inorganic chemistry , chemistry , organic chemistry , engineering
Herein, we report on unique bimetallic PtPb/Pt core/shell nanodisks consisting of structurally ordered PtPb hexagonal nanoplates as the core and the well‐organized Pt as the shell, as extremely active and selective catalysts towards CH 3 OH reformation. We found that the created Pt‐Pb nanodisks/C show the composition‐dependent activity with the optimized PtPb 0.56 nanodisks/C being the most active for the CH 3 OH reformation to H 2 , 5.1 times higher than those of the commercial Pt/C. Significantly, only very limited carbon monoxide (CO) is produced during the CH 3 OH reformation, which is crucial for the practical application in fuel cells. The PtPb 0.56 nanodisks/C is also more active for CH 3 OH reformation than PtPb hexagonal nanoplates/C and PtPb 0.58 nanoparticles/C. X‐ray photoelectron spectroscopy (XPS) results reveal that the high ratio of Pt (0) to Pt (II) in Pt‐Pb nanodisks/C enhances the CH 3 OH reformation to H 2 , while the high content of Pb (0) is beneficial for decrease the CO production. Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) of CO adsorption shows that Pt‐Pb nanodisks can promote the activation of CO molecules by forming the carboxylate (CO 2 δ − ) intermediates, leading to the low CO production.