Structure-controlled synthesis of palladium concave nanocubes via CTAB-assisted reduction for methanol electro-oxidation

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Structure-controlled synthesis of Pd nanocrystals has received much attention recently due to their remarkable catalytic performance. To get deep insight into the mechanism of kinetically controlled overgrowth and the relationship between structure and electrocatalytic performance, palladium concave nanocubes (PdCNs) with high-index facets were synthesized through a facile none-seeded routine induced by hexadecylpyridinium bromide (CTAB). The structural changes of PdCNs along with the concentration of CTAB, reaction time and temperature were investigated by transmission electron microscopy and X-ray diffraction. It was indicated that Pd nanocubes first grew into larger size with numerous interstices inside the PdCNs, and then the inner interstices were filled along with oxidative etching on the surface. The electrocatalytic activities of PdCNs with different structures were evaluated toward the electro-oxidation of methanol. The result showed that the electrocatalytic activity weakened with the decrease in interstices, which demonstrated that interstices played a more crucial role than the concave structures.

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This work was supported by the National Natural Science Foundation of China (Grant Nos. 76074 & 21706053), Project of Heilongjiang Science and Technology (ZY17A06) and Science Foundation of Heilongjiang Academy of Sciences (YY2017SH01&ZNBZ2018SH01).

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Correspondence to Xuefeng Bai.

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Cui, Z., Bai, X. Structure-controlled synthesis of palladium concave nanocubes via CTAB-assisted reduction for methanol electro-oxidation. J Mater Sci 55, 4808–4819 (2020) doi:10.1007/s10853-019-04336-4

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