Mechanistic analysis of multiple processes controlling solar-driven H<sub>2</sub>O<sub>2</sub> synthesis using engineered polymeric carbon nitride.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 34140505.
- Also identified by DOI 10.1038/s41467-021-24048-1 and PMC identifier 8211848.
- 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
Solar-driven hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) production presents unique merits of sustainability and environmental friendliness. Herein, efficient solar-driven H<sub>2</sub>O<sub>2</sub> production through dioxygen reduction is achieved by employing polymeric carbon nitride framework with sodium cyanaminate moiety, affording a H<sub>2</sub>O<sub>2</sub> production rate of 18.7 μmol h <sup>-1</sup> mg<sup>-1</sup> and an apparent quantum yield of 27.6% at 380 nm. The overall photocatalytic transformation process is systematically analyzed, and some previously unknown structural features and interactions are substantiated via experimental and theoretical methods. The structural features of cyanamino group and pyridinic nitrogen-coordinated soidum in the framework promote photon absorption, alter the energy landscape of the framework and improve charge separation efficiency, enhance surface adsorption of dioxygen, and create selective 2e<sup>-</sup> oxygen reduction reaction surface-active sites. Particularly, an electronic coupling interaction between O<sub>2</sub> and surface, which boosts the population and prolongs the lifetime of the active shallow-trapped electrons, is experimentally substantiated.