is your idea of using CO2, sunlight and water to make energy efficient enough to be used on a large scale

Question: is your idea of using CO2, sunlight and water to make energy efficient enough to be used on a large scale
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Asked by westwood to Chia-Yu on 20 Jun 2013.
- Chia-Yu Lin answered on 20 Jun 2013:
  
  So far, the catalysts for the chemical reaction of fuel generation rely on the expensive metals, such as Pt and Ru, as they are highly active and stable. Therefore, at this stage, it can not be used on a large scale. We are working on the development of earth abundant material based catalyst, such as iron based materials. Hopefully, this approach can be used on a large scale.

Question: is your idea of using CO2, sunlight and water to make energy efficient enough to be used on a large scale