Affiliation:
1. School of Materials Science and Engineering China University of Petroleum (East China) Qingdao 266580 P. R. China
2. Department of Chemistry and Chemical Engineering University of Science and Technology Beijing Beijing 100083 P. R. China
Abstract
AbstractDecorating platinum (Pt) with a single atom offers a promising approach to tailoring their catalytic activity. In this study, for the first time, an innovative assistive active sites (AAS) strategy is proposed to construct high–loading (3.46wt.%) single Fe─N4 as AAS, which are further hybridized with small Pt nanoparticles to enhance both oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR) activities. For ORR, the target catalyst (Pt/HFeSA–HCS) exhibits a higher mass activity (MA) of 0.98 A mgPt−1 and specific activity (SA) of 1.39 mA cmPt−2 at 0.90 V versus RHE. As for MOR, Pt/HFeSA–HCS shows exceptional MA (3.21 A mgPt−1) and SA (4.27 mA cmPt−2) at peak values, surpassing commercial Pt/C by 15.3 and 11.5 times, respectively. The underlying mechanism behind this AAS strategy is to find that in MOR, Fe─N4 promotes water dissociation, generating more *OH to accelerate the conversion of *CO to CO2. Meanwhile, in ORR, Fe─N4 acts as a competitor to adsorb *OH, weakening Pt─OH bonding and facilitating desorption of *OH on the Pt surface. Constructing AAS that can enhance dual functionality simultaneously can be seen as a successful “kill two birds with one stone” strategy.
Funder
Taishan Scholar Foundation of Shandong Province
National Natural Science Foundation of China
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
1 articles.
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