Multidimensional Heteromorphic Bi₂WO₆ Anchored With Au-Bi Bimetallic Nanodots Toward Photocatalytic Acetaldehyde...

Constructing photocatalysts with multidimensional active site architectures represents a powerful strategy for boosting visible-light-driven VOC degradation efficiency. Here, we report a structure regulation strategy achieved through interface coupling of a bimetallic gold-bismuth (Au-Bi) nanodot network with heteromorphic Bi₂WO₆ composed of mesoporous nanofibers and nanosheets. This yields distinctive Au-Bi nanodot-anchored 1D/2D Bi₂WO₆ photocatalysts exhibiting optimized charge transfer pathways and amplified surface reactivity. The bimetallic Au-Bi network collaboratively forms multi-scale Schottky junctions, effectively promoting the separation of photogenerated electron-hole pairs while simultaneously enhancing visible-light absorption via localized surface plasmon resonance effects. Concurrently, the in situ formation of 0D Au-Bi nanodots and heteromorphic 1D/2D Bi₂WO₆ during reduction sintering induces abundant oxygen vacancies, promoting oxygen activation and reactive oxygen species generation. The multidimensional 0D/1D/2D Au-Bi/Bi₂WO₆ photocatalyst rapidly and thoroughly degrades acetaldehyde, achieving degradation rates 13.2-fold and 5.92-fold higher than those of 1D/2D Bi₂WO₆ and 1D/2D Bi-Bi₂WO₆, respectively. Moreover, this catalyst maintains exceptional stability across five consecutive cycles. This work pioneers an innovative methodology for designing high-performance heterogeneous photocatalysts.