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1.A chemical reaction scheme showing catalyst synthesis would be helpful.  Also, balance all chemical reactions on this, and on the proposed photoreaction scheme¡£
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2.Figure 4 needs a more detailed caption, and arrows pointing to Cu3+/2+/++ should be given.  The XPS data is questionable since the fitting requires high resolution XPS.  Some data to show that they can resolve Cu3+/2+/1+ in a standard known sample would be helpful.
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3.In our own work in the area of hydrogen reduced catalysts, we became aware that stoichiometric (not catalytic) reactions are possible.  A rough calculation for the author's catalysts shows that about 850 -mole of reduced Cu-Ni is present in their 0.1 g catalysts.  Yields of H2 from water splitting need to be much higher overall than 850 -mole.  Thus, the question, how long do the catalysts live and what is the TOTAL  -moles H2 produced, compared with the -moles catalyst present?
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