Regulation of surface frustrated Lewis acid-base property of BiOBr by Ti incorporation for CO2 photoreduction

In this paper, Ti isomorphic substituted BiOBr (Ti-BiOBr) is obtained by chemical method. The optimized TiBiOBr exhibites superior CO yield of 122.74 mu mol center dot g(- 1)center dot h(- 1) which achieves 6.53-fold increasement compared to pristine BiOBr. Due to doping of Ti elements, more oxygen vacancies are formed in BiOBr. The oxygen vacancies and Ti atoms promote the formation of surface frustrated Lewis pairs (FLPs) for BiOBr. The Ti atom is assigned to Lewis acid site, while the neighboring O atom acts as Lewis base site. The substitution of Ti atoms significantly promote the adsorption and activation of CO2 molecules on surface of BiOBr. This work provides valuable idea for the development of efficient photocatalysts for CO2 reduction.