the system can duplicate the water splitting reaction that occurs during photosynthesis
Hmmmm. Photosynthesis obtains oxygen (and sugar) from Carbon Dioxide and water
The article doesn't suggest where the sugar goes, (alcohol maybe with a bit of yeast ?)
Whilst it all looks good on paper, I cannot help feeling that a mechanical process using solar panels ( an energy intensive product to manufacture), cannot begin to compete with the efficiency of plants.