期刊
ADVANCED MATERIALS INTERFACES
卷 6, 期 17, 页码 -出版社
WILEY
DOI: 10.1002/admi.201900565
关键词
carbon nanofibers; co-catalysts; niobium oxide; Pt catalyst supports
资金
- University Grants Commission (UGC), India
- DST-PURSE, Bharathiar University
Designing an electrocatalyst by integrating multiple classes of materials is an effective strategy for reinforcing the electrode properties. This study demonstrates a facile electrospinning technique for functionalizing the carbon nanofibers (CNFs) with Nb2O5 co-catalyst as the support material for platinum nanoparticles. The resultant Nb CNF-Pt electrode has a sensible Pt loading of 30 mu g cm(-2) and manifests high catalytic activity towards the oxygen reduction reaction (ORR), methanol oxidation reaction (MOR), hydrogen evolution reaction (HER), and oxygen evolution reaction (OER). The Nb CNF-Pt outperforms the commercial 20 wt% Pt loaded carbon with high positive onset potential (0.99 V vs reversible hydrogen electrode (RHE)) and half-wave potential (0.87 V vs RHE) during ORR. It also provides large electrochemical active surface area (94.19 m(2) g(-1)) and mass activity (783.34 mA mg(-1)) during MOR. Furthermore, the Nb CNF-Pt electrode demands an extremely minimal overpotential of 37 and 325 mV and a Tafel slope of 38 and 81 mV dec(-1) for HER and OER, respectively. The enhanced electrocatalytic activity of Nb CNF-Pt is attributed to the strong metal-support interaction between Nb2O5 and Pt, resulting in a uniform loading of Pt NPs with reduced particle size and agglomeration-free distribution.
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