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(a) Low-magnification SEM micrograph (Scale bar, 500 nm), (b) high-magnification SEM micrograph (Scale bar, 100 nm), (c) TEM micrograph (Scale bar, 100 nm) and (d) HAADF-STEM micrograph (Scale bar, 100 nm) of mesoporous Rh nanoparticles. The inset in c is a high-magnification TEM micrograph of a single mesoporous Rh nanoparticle (Scale bar, 50 nm).
