Huang Shuangshuang, Yang Nating, Huo Minfeng, Sun Yuhan, Zhu Yan
CAS key laboratory of Low-Carbon Conversion Science and Engineering, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China.
Nanoscale. 2016 Mar 28;8(12):6451-5. doi: 10.1039/c5nr07706k.
We report the synthesis of PtxCoy@Co cubes and PtxCoy multicubes through use of the previous structure as a seed precursor to induce the formation of the latter. Herein, PtxCoy nanocrystals underwent a shape evolution from a core-shell structure to multicubes under an identical synthetic condition via using the previous structure serving as a seed precursor to induce the formation of the latter. PtxCoy@Co cubes can be viewed as a PtxCoy octapod core coated by a Co atom shell that exhibits complete selectivity towards the C=C bond of unsaturated aldehydes. The Co shell of PtxCoy@Co was further substituted by introducing Pt atoms, followed by successive deposition of Pt on PtxCoy, and interdiffusion between Pt and Co, leading to formation of multicubes. Such multicubes gave rise to superior catalytic activity with higher selectivity for the C=O bond of unsaturated aldehydes compared to pure Pt nanocubes and a commercial Pt/C catalyst.
我们报道了通过使用先前的结构作为种子前驱体来诱导后者的形成，从而合成了PtxCoy@Co立方体和PtxCoy多立方体。在此，在相同的合成条件下，通过使用先前的结构作为种子前驱体来诱导后者的形成，PtxCoy纳米晶体经历了从核壳结构到多立方体的形状演变。PtxCoy@Co立方体可以看作是由Co原子壳包覆的PtxCoy八足体核，其对不饱和醛的C=C键表现出完全的选择性。通过引入Pt原子进一步取代PtxCoy@Co的Co壳，随后在PtxCoy上连续沉积Pt，并使Pt和Co之间发生相互扩散，从而导致多立方体的形成。与纯Pt纳米立方体和商业Pt/C催化剂相比，这种多立方体对不饱和醛的C=O键具有更高的选择性，从而产生了优异的催化活性。
