期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 27, 页码 30336-30342出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c05868
关键词
Pd-Pt bimetallic nanocrystal; dendritic nanosheets; electrocatalysis; bifunctional catalyst; oxygen reduction reaction; methanol oxidation reaction
资金
- National Natural Science Foundation of China [21775095]
- Key R&D Project of Shanxi [201803D221008-11]
- Young Sanjin Scholar Foundation of Shanxi Province
- Program for the Young Talents of Higher Education Institution of Shanxi
Pd-Pt bimetallic nanocrystals have become appealing in the electrocatalytic field by virtue of their synergy effects derived from the electronic coupling between two metals. Herein, a facile seed-mediated growth approach is reported for synthesis of Pt-on-Pd dendritic nanosheets (DNSs) through the growth of Pt branches on ultrathin Pd nanosheets (NSs). The as-obtained Pt-on-Pd DNSs exhibit superior catalytic activity toward both oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR), with mass activities (MAs) 2.2 times higher for ORR and 3.4 times higher for MOR than commercial Pt/C catalysts. Moreover, these spatially separated Pt branches supported on 2D NSs also endow the Pt-onPd DNSs with impressive durability for ORR with only 18.9% loss in MA, whereas the Pt/C catalyst loses 50.0% after 10,000-cycle accelerated durability tests. This 2D DNS architecture can be extended to other 2D metallic NS substrates for constructing Pt-based electrocatalysts with excellent electrocatalytic performance.
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