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An optimized sol-gel method for TiO2 coating was developed for CO2 photoreduction using a systematic Design of Experiments (DOE) approach and an efficient Plackett-Burman (PB) design. Conducting fifteen experiments, the effects of seven sol-gel process parameters were investigated on four catalytic properties for CO2 photoreduction: band gap, catalyst coverage, anatase crystallinity and ratio anatase:rutile...