Abstract
The shape-tunable PtCuNi rhombic dodecahedra nanoframe is achieved via modified solvothermal and two-step etching, the first step is PtCuNi concave rhombic dodecahedra synthetized due to oxidation etching, and the second step is PtCuNi nanoframes obtained through the acid etching. The PtCuNi solid rhombic dodecahedra as an intermediate product can be well controlled by adjusting the amount of reaction time and Ni precursor. Based on the formation mechanism of PtCu nanoframes, the morphological evolution process of ternary nanoframe is precisely investigated according to the changes of morphology, atomic ratio and average particle size. In addition, shape-tunable PtCuNi nanoframes catalyst shows enhanced mass activity of 0.86 A mg−1Pt at 0.9 V versus reversible hydrogen electrode towards oxygen reduction reaction, which is 6 times as well as that of the commercial Pt/C catalyst. Remarkably, there is a more positive onset potential of PtCuNi nanoframes compared to other catalysts. More importantly, this synthetic method opens a promising door towards development and applications of Pt based catalysts.
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