Photocatalysis is a promising method for removing atmospheric NO but suffers from unsatisfactory removal efficiency and selectivity. Inorganic lead halide perovskites (LHPs) have been intensely investigated in the field of solar cells as new wonder materials. The intrinsic merits of LHPs provide additional opportunities for their use in fields beyond photovoltaics. Herein, for the first time, we extend the application of the low-cost lead inorganic CsPbBr₃ perovskite to high-performance photocatalytic elimination of NO under visible-light irradiation. The CsPbBr₃ nanocrystals (NCs) with an edge size of ca. 12 nm can reach a high NO removal activity (50.6%) under a gas hourly space velocity (GHSV) of 1,800,000 mL h^–1 g^–1 and obtain high selectivity (89.0%) for the formation of ionic species instead of more toxic NO₂. A significant improvement for NO removal over the state-of-the-art photocatalysts with an outstanding long-term stability of up to 15 h is demonstrated. The excellent performance can be ascribed to the efficient charge separation and transfer and the visible-light-harvesting ability of CsPbBr₃ NCs. These findings open a new avenue for the use of the low-cost, easy-to-process, highly efficient, and air-tolerant CsPbBr₃ perovskites toward air pollution remediation.

中文翻译：

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CsPbBr ₃钙钛矿纳米晶体：一种用于实现 NO 减排的稳健光催化剂

光催化是去除大气中 NO 的一种很有前途的方法，但其去除效率和选择性并不令人满意。无机卤化铅钙钛矿（LHPs）作为新的神奇材料在太阳能电池领域得到了广泛的研究。LHP 的内在优点为其在光伏以外的领域中的使用提供了额外的机会。在此，我们首次将低成本铅无机 CsPbBr ₃钙钛矿的应用扩展到在可见光照射下高性能光催化消除 NO。CsPbBr ₃纳米晶体 (NCs) 的边缘尺寸约为 在 1,800,000 mL h ^–1 g ^–1的气时空速 (GHSV) 下，12 nm 可达到高 NO 去除活性 (50.6%)并获得高选择性 (89.0%) 以形成离子物种而不是毒性更大的 NO ₂。证明了与最先进的光催化剂相比，NO 去除的显着改进，具有长达 15 小时的出色长期稳定性。优异的性能可归因于 CsPbBr ₃ NCs的高效电荷分离和转移以及可见光捕获能力。这些发现为使用低成本、易于加工、高效且耐空气的 CsPbBr ₃钙钛矿修复空气污染开辟了一条新途径。