Boron-Induced Electronic Modulation and Nanocrystal Fragmentation Synergistically Boost Photocatalytic Water Oxidation in Ionic Carbon Nitrides.

ABSTRACT: Photocatalytic water oxidation is a critical half-reaction to realize overall water splitting, yet it remains challenging due to sluggish reaction kinetics and the need for efficient active centers. To overcome these limitations, we introduce a dual strategy combining boron doping with nanocrystal fragmentation to boost the photocatalytic oxygen evolution reaction (OER) performance of ionic carbon nitrides. The optimal catalyst (0.25%B-KPHI) achieves an apparent quantum efficiency of 4.6% at 420 nm with CoO _x as a cocatalyst for OER, outperforming most previously reported carbon nitride photocatalysts. Extensive experimental analyses revealed that boron incorporation induces the fragmentation of nanocrystalline domains within the potassium poly-(heptazine imide) (K

SUBMITTER: Tong H 

PROVIDER: S-EPMC12603997 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature