Morphology engineering stands as a cornerstone strategy to boost the light harvesting and charge transport properties of wide-bandgap oxide photocatalysts. Herein, a Zn$_2$GeO$_4$ photocatalyst with a highly symmetric conical bundle architecture is successfully fabricated via modulating the dosage of ethylenediamine (EDA). The introduction of a moderate EDA dosage effectively triggers the anisotropic growth of Zn$_2$GeO$_4$, thus constructing a compact and highly ordered conical bundle microstructure (denoted as 4-ZGO). This unique hierarchical morphology not only remarkably shortens the migration pathway of photogenerated charge carriers toward the catalyst surface, but also substantially s... More >