Fig. 4. SEM images of (a) C-SO3H (500× magnification) and (b) Pd/C-SO3H (5000× magnification); energy spectrum analyses of (c) C-SO3H and (d) Pd/C-SO3H (elemental Au is due to gold plating); (e) EDS images of C-SO3H and (f) EDS images of Pd/C-SO3H.
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