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首页> 外文期刊>ACS applied materials & interfaces >Block-Co-polymer-Assisted Synthesis of All Inorganic Highly Porous Heterostructures with Highly Accessible Thermally Stable Functional Centers
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Block-Co-polymer-Assisted Synthesis of All Inorganic Highly Porous Heterostructures with Highly Accessible Thermally Stable Functional Centers

机译：嵌段 - 共聚物辅助合成所有无机高度多孔异质结构，具有高度可接近的热稳定功能中心

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摘要

Here, we propose a simple approach for the design of highly porous multicomponent heterostructures by infiltration of block-co-polymer templates with inorganic precursors in swelling solvents followed by gas-phase sequential infiltration synthesis and thermal annealing. This approach can prepare conformal coatings, free-standing membranes, and powders consisting of uniformly sized metal or metal oxide nanoparticles (NPs) well dispersed in a porous oxide matrix. We employed this new, versatile synthetic concept to synthesize catalytically active heterostructures of uniformly dispersed similar to 4.3 nm PdO nanoparticles accessible through three-dimensional pore networks alumina support. Importantly, such materials reveal high resistance against sintering at 800 degrees C, even at relatively high loadings of NPs (similar to 10 wt %). At the same time, such heterostructures enable high mass transport due to highly interconnected nature of the pores. The surface of synthesized nanoparticles in the porous matrix is highly accessible, which enables their good catalytic performance in methane and carbon monoxide oxidation. In addition, we demonstrate that this approach can be utilized to synthesize heterostructures consisting of different types of NPs on a highly porous support. Our results show that swelling-based infiltration provides a promising route toward the robust and scalable synthesis of multicomponent structures.
机译：在此，我们提出了一种通过在溶胀溶剂中渗透嵌入嵌段 - 共聚物模板来设计高度多孔多组分异质结构的简单方法，然后是气相顺序浸润合成和热退火。该方法可以制备由均匀尺寸的金属或金属氧化物纳米颗粒（NPS）组成的共形涂层，独立膜和粉末，该粉末组成，良好地分散在多孔氧化物基质中。我们使用这种新的通用合成概念，合成均匀分散的催化活性异质结构，其类似于通过三维孔网络氧化铝载体可获得的4.3nm PDO纳米粒子。重要的是，这种材料甚至在800℃下露出高抗烧结，即使在相对高的NPS（类似于10wt％）。同时，这种异质结构由于孔的高度互连性质而使得高质量运输。多孔基质中合成的纳米颗粒的表面可高度可接近，可使其在甲烷和一氧化碳氧化中的良好催化性能。此外，我们证明这种方法可用于合成由不同类型的NP组成的异质结构，在高度多孔载体上。我们的研究结果表明，基于膨胀的渗透为多组分结构的鲁棒和可扩展合成提供了有希望的路线。

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