Clean Rh hydrosols have been prepared through facile dispersion of 1 mm diameter pure Rh wire with square wave potential (SWP) or alternating voltage (AV), an interesting method similar to our recent work on preparing Pt hydrosols (Electrochem. Commun. 2009, 11: 469-472). The potential is controlled such that it involves Rh electro-redox and strong hydrogen evolution. Rh nanoparticles (NPs) form by the redox and are dispersed into the blank solution of NaOH by the vigorous gas release. Moreover, porous surface is also acquired. The as-prepared Rh NPs were characterized by transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Both the Rh NPs and the porous surface have high electrocatalytic activity toward the electroreduction of nitrate mainly due to their large active areas.
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Liu et al. (2009) studied this question.
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