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We demonstrated a new method based on shape transformation, which has potential to prepare sub-10nm tetrahexahedral Pt nanocrystals (THH Pt NCs) with high-index facets. It was found that after subjected to square-wave potential treatment for 2min, Pt nanocubes of 10nm in edge length will be converted to THH Pt NCs with sizes varying from 6 to 20nm. TEM characterization indicated that the surfaces...
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