Department of Chemistry, Indiana University, 800 E. Kirkwood Ave., Bloomington, Indiana 47405, United States.
Inorg Chem. 2023 Jun 19;62(24):9640-9648. doi: 10.1021/acs.inorgchem.3c01114. Epub 2023 Jun 2.
Bismuth oxyhalides are a promising class of photocatalysts for harvesting solar energy. These materials are often synthesized in aqueous media with poor synthetic control resulting from the extremely fast nucleation and growth rates of the particles. These fast rates are caused by the rapid precipitation of bismuth salts with free halide ions. We have developed water-soluble precursors combining bismuth with either chlorine or bromine atoms in the same metal-organic complex. With the application of heat, halide ions are released, which then precipitate with bismuth ions as BiOX (X = Cl, Br). By controlling the halide ion formation rate, the nucleation and growth rates of BiOX materials can be tuned to provide synthetic control. The diverse potential of these precursors is demonstrated by synthesizing BiOX in three ways: aqueous colloidal synthesis, solid-state decomposition, and fabrication of films of BiOX via spray pyrolysis of the aqueous precursor solutions. These broadly applicable single-source precursors will enhance the ability to synthesize future BiOX materials with controlled morphologies.
铋氧卤化物是一类很有前途的光催化剂，可用于采集太阳能。这些材料通常在水相中合成，但由于粒子的成核和生长速度极快，合成控制效果较差。这种快速速率是由具有游离卤离子的铋盐的快速沉淀引起的。我们开发了水溶性前体，将铋与氯或溴原子结合在同一个金属有机络合物中。通过加热，卤离子被释放出来，然后与铋离子一起沉淀形成 BiOX（X=Cl，Br）。通过控制卤离子形成速率，可以调整 BiOX 材料的成核和生长速率，以提供合成控制。这些前体的多种潜在用途通过三种方式合成 BiOX 来证明：水相胶体合成、固态分解以及通过水相前体溶液的喷雾热解来制备 BiOX 薄膜。这些广泛适用的单源前体将提高用可控形态合成未来 BiOX 材料的能力。
