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|Hierarchically Skeletal Multi-layered Pt-Ni Nanocrystals for Highly Efficient Oxygen Reduction and Methanol Oxidation Reactions
Tian, Z. Q.
Hasan, S. W.
Shen, P. K.
|Hierarchically Skeletal Multi-layered Pt-Ni Nanocrystals for Highly Efficient Oxygen Reduction and Methanol Oxidation Reactions / S. Li, Z. Q. Tian, Y. Liu et al. — DOI 10.1134/S1070363210120303 // Chinese Journal of Catalysis. — 2021. — Vol. 42. — Iss. 4. — P. 648-657.
|Pt based materials are the most efficient electrocatalysts for the oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR) in fuel cells. Maximizing the utilization of Pt based materials by modulating their morphologies to expose more active sites is a fundamental objective for the practical application of fuel cells. Herein, we report a new class of hierarchically skeletal Pt-Ni nanocrystals (HSNs) with a multi-layered structure, prepared by an inorganic acid-induced solvothermal method. The addition of H2SO4 to the synthetic protocol provides a critical trigger for the successful growth of Pt-Ni nanocrystals with the desired structure. The Pt-Ni HSNs synthesized by this method exhibit enhanced mass activity of 1.25 A mgpt−1 at 0.9 V (versus the reversible hydrogen electrode) towards ORR in 0.1-M HClO4, which is superior to that of Pt-Ni multi-branched nanocrystals obtained by the same method in the absence of inorganic acid; it is additionally 8.9-fold higher than that of the commercial Pt/C catalyst. Meanwhile, it displays enhanced stability, with only 21.6% mass activity loss after 10,000 cycles (0.6–1.0 V) for ORR. Furthermore, the Pt-Ni HSNs show enhanced activity and anti-toxic ability in CO for MOR. The superb activity of the Pt-Ni HSNs for ORR and MOR is fully attributed to an extensively exposed electrochemical surface area and high intrinsic activity, induced by strain effects, provided by the unique hierarchically skeletal alloy structure. The novel open and hierarchical structure of Pt-Ni alloy provides a promising approach for significant improvements of the activity of Pt based alloy electrocatalysts. © 2021 Dalian Institute of Chemical Physics, the Chinese Academy of Sciences.
HIERARCHICALLY SKELETAL PT-NI NANOCRYSTALS
METHANOL OXIDATION REACTION
OXYGEN REDUCTION REACTION
SOLVENT THERMAL METHOD
OXYGEN REDUCTION REACTION
ELECTROCHEMICAL SURFACE AREA
METHANOL OXIDATION REACTIONS
REVERSIBLE HYDROGEN ELECTRODES
|This work was supported by the National Key Research and Development Plan (2017YFB0103001), the link project of the National Natural Science Foundation of China and Fujian Province (U1705252), the Guangxi Science and Technology Projects (AA17204083, AB16380030), the innovation project of Guangxi Graduate Education (YCBZ2019012).
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