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Mesoporous Titanium Oxynitride Monoliths from Block Copolymer-Directed Self-Assembly of Metal-Urea Additives.
Langmuir ( IF 3.7 ) Pub Date : 2020-08-13 , DOI: 10.1021/acs.langmuir.0c01729
Yun Li 1 , Raymond Horia 1 , Wei Xin Tan 1 , Nathawat Larbaram 1 , Wardhana A Sasangka 2 , William Manalastas 1 , Srinivasan Madhavi 1 , Kwan W Tan 1
Affiliation  

This report describes a simple one-pot soft-templating and ammonolysis-free approach to synthesize mesoporous crystalline titanium oxynitride by combining block copolymer-directed self-assembly with metal sol and urea precursors. The Pluronic F127 triblock copolymer was employed to structure-direct titanium-oxo-acetate sol nanoparticles and urea–formaldehyde into ordered hybrid mesostructured monoliths. The hybrid composites were directly converted into mesoporous crystalline titanium oxynitride and retained macroscale monolithic integrity up to 800 °C under nitrogen. Notably, the urea–formaldehyde additive provided nitrogen and rigid support to the inorganic mesostructure during crystallization. The resultant mesoporous titanium oxynitride exhibited good electrochemical catalytic activity toward hydrogen evolution reaction in 1 M KOH aqueous medium under applied bias. Our results suggest an inexpensive and safe pathway to generate ordered mesoporous crystalline metal oxynitride structures suitable for catalyst and energy-storage applications.

中文翻译:

嵌段共聚物导向的金属-尿素添加剂自组装的中孔氧氮化钛整体结构。

该报告描述了一种简单的一锅法软模板化和无氨解的方法,该方法通过将嵌段共聚物定向的自组装与金属溶胶和尿素前体相结合来合成介孔结晶氮氧化钛。使用Pluronic F127三嵌段共聚物将结构-钛-氧代-乙酸盐溶胶纳米颗粒和尿素-甲醛直接定向成有序的杂化介观结构整体。将杂化复合材料直接转化为中孔结晶氮氧化钛,并在氮气氛下保持高达800°C的宏观整体完整性。值得注意的是,尿素-甲醛添加剂在结晶过程中为无机介孔结构提供了氮和刚性支撑。在施加的偏压下,所得的介孔氮氧化钛对氢析出反应表现出良好的电化学催化活性。我们的结果表明,一种廉价且安全的途径可生成适用于催化剂和储能应用的有序介孔晶体金属氮氧化物结构。
更新日期:2020-09-15
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