Herein, a wide-spectrum (~678 nm) responsive Bi₈(CrO₄)O₁₁ photocatalyst with a theoretical solar spectrum efficiency of 42.0% was successfully constructed. Bi₈(CrO₄)O₁₁ showed highly efficient and stable photocatalytic water oxidation activity with a notable apparent quantum efficiency of 2.87% (420 nm), superior to many reported wide-spectrum driven photocatalysts. Most remarkably, its strong oxidation ability also enables the simultaneous degradation and complete mineralization for phenol, and its excellent performance is about 23.0 and 2.9 times higher than CdS and P25-TiO2, respectively. And its high activity ascribes to the giant internal electric field induced by its large crystal dipole, which accelerates the rapid separation of photogenerated electron-hole pairs. Briefly, the discovery of wide-spectrum bismuth chromate and the mechanism of exponentially enhanced photocatalytic performance by increasing crystal dipole throw light on improving solar energy conversion.

中文翻译：

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大偶极矩诱导高效铬酸铋光催化剂用于广谱驱动的水氧化和污染物的完全矿化

在此，成功构建了一种宽光谱（~678 nm）响应的 Bi ₈ (CrO ₄ )O ₁₁光催化剂，其理论太阳光谱效率为 42.0%。Bi ₈ (CrO ₄ )O ₁₁表现出高效和稳定的光催化水氧化活性，显着的表观量子效率为 2.87% (420 nm)，优于许多报道的广谱驱动光催化剂。最引人注目的是，其强大的氧化能力还可以同时降解和完全矿化苯酚，其优异的性能分别比 CdS 和 P25-TiO2 高约 23.0 倍和 2.9 倍。其高活性归因于其大晶体偶极子引起的巨大内部电场，加速了光生电子-空穴对的快速分离。简而言之，广谱铬酸铋的发现和通过增加晶体偶极子以指数方式增强光催化性能的机制为改善太阳能转换提供了线索。