Work

Dialysis‐Exfoliation of Poly(Heptazine Imide) Ultrathin Nanosheets With Boosted Photocatalytic Activity

Year: 2025

Type: article

Abstract: ABSTRACT Poly(heptazine imide) ultrathin nanosheets (PHIuns) are efficient photocatalysts, yet current synthetic methods remain inefficient, costly, and not scalable for industrial applications. Herein, we present a facile dialysis process to synthesize PHIuns via exfoliation from sodium poly(heptazine imide) (PHI‐Na), driven by the loss of Na⁺ ions. The exfoliation process yields PHIuns with a thickness of ∼0.5 nm, revealing a distinct quantum size effect, and thus PHIuns exhibit considerably enhanced photogenerated charge separation and photocatalytic performance compared to PHI‐Na and acid‐treated PHI‐Na (PHI‐H, devoid of Na + ions). Notably, photocatalytic overall water splitting activity of Pt@CrO x and CoOH co‐modified PHIuns is approximately 14 and 252 times higher than that of corresponding PHI‐H and PHI‐Na, respectively. This work introduces a cost‐effective, efficient, and scalable approach for the synthesis of PHIuns.

Source: Small

DOI: 10.1002/smll.202512992