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To demonstrate the increased surface area resulting from the hollow structure, carbon monoxide stripping voltammetry studies were performed on both hollow and solid palladium/platinum nanocubes. Both types of nanocubes are of similar sizes (ca. 12 nm). The hollow nanocubes show a current density that is twice that of the solid cubes (Supporting Information, Figure S15). This observation is consistent with the increased accessible surface area caused by the hollow structure discussed above. Such a surface-area increment in the hollow cubes might explain the enhanced performance of the hollow nanocubes in the electrooxidation of formic acid (Supporting Information, Figure S15).

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