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    I have one query related to the XPS study, in particular Figure 2. It is concluded that the shift in the peaks is due to co-ordination with O and N in PVP which is consistent with the O 1s and N 1s data, however have the authors considered that there may be some Rh2O3 also present given the proximity of the peak positions to that seen in Figure 6a? It is known that PVP is a mild reducing agent and may reduce RhCl3 to Rh metal which may be oxidised in air. A control experiment to rule out this possibility should be undertaken.
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