Selective photocatalytic CO<sub>2</sub> reduction in aerobic environment by microporous Pd-porphyrin-based polymers coated hollow TiO<sub>2</sub>.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 35301319.
- Also identified by DOI 10.1038/s41467-022-29102-0 and PMC identifier 8930982.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Direct photocatalytic CO<sub>2</sub> reduction from primary sources, such as flue gas and air, into fuels, is highly desired, but the thermodynamically favored O<sub>2</sub> reduction almost completely impedes this process. Herein, we report on the efficacy of a composite photocatalyst prepared by hyper-crosslinking porphyrin-based polymers on hollow TiO<sub>2</sub> surface and subsequent coordinating with Pd(II). Such composite exhibits high resistance against O<sub>2</sub> inhibition, leading to 12% conversion yield of CO<sub>2</sub> from air after 2-h UV-visible light irradiation. In contrast, the CO<sub>2</sub> reduction over Pd/TiO<sub>2</sub> without the polymer is severely inhibited by the presence of O<sub>2</sub> ( ≥ 0.2 %). This study presents a feasible strategy, building Pd(II) sites into CO<sub>2</sub>-adsorptive polymers on hollow TiO<sub>2</sub> surface, for realizing CO<sub>2</sub> reduction with H<sub>2</sub>O in an aerobic environment by the high CO<sub>2</sub>/O<sub>2</sub> adsorption selectivity of polymers and efficient charge separation for CO<sub>2</sub> reduction and H<sub>2</sub>O oxidation on Pd(II) sites and hollow TiO<sub>2</sub>, respectively.