Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
11008099 | Electrochimica Acta | 2019 | 34 Pages |
Abstract
Worm-like PtP nanocrystals supported on NiCo2Px/carbon black (NiCo2Px/C) composites were prepared by a combined hydrothermal, low temperature phosphidation and NaBH4 reduction process. Noteworthily, the presence and content of phosphorus (P) play a critical role in constructing one-dimensional (1D) PtP nanostructures. Electrochemical tests demonstrate that the obtained PtP-NiCo2Px/C hybrid exhibits an extremely high mass activity of 1361â¯mA mgâ1Pt for methanol electrooxidation in acidic medium, which is 3.5- and 7.6-fold greater than those of commercial Pt/C (393â¯mA mgâ1Pt) and home-made Pt/C catalyst (180â¯mA mgâ1Pt), respectively. Meanwhile, the catalytic performence of PtP-NiCo2Px/C is also better than those of the PtP-CoP/C and PtP-Ni2P/C catalysts due to the synergistic effect of Co and Ni. Furthermore, PtP-NiCo2Px/C catalyst exhibited better durability and CO tolerance compared with other catalysts in this study. The enhanced catalytic performence of PtP-NiCo2Px/C hybrid can be attributed to the special 1D morphology of PtP nanocrystals, the strong interaction between catalytic species and support, as well as the existence of metal center (Mδ+, Mâ¯=â¯Ni or Co) and Pδâ active sites for the dissociation of H2O molecules. The design of 1D PtP alloy nanostructures and co-catalytic effect of NiCo2Px provides a promising method to significantly improve methanol oxidation performence.
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Authors
Minghang Jiang, Li Ma, Mengyu Gan, Liangqing Hu, Hongmei He, Fei Xie, Huanhuan Zhang,