Wood Materials Science , ETH Zürich , 8093 Zürich , Switzerland.
Cellulose and Wood Materials , Empa - Swiss Federal Laboratories for Materials Science and Technology , 8600 Dübendorf , Switzerland.
ACS Nano. 2019 Dec 24;13(12):14337-14347. doi: 10.1021/acsnano.9b07801. Epub 2019 Dec 5.
Despite the excellent catalytic properties of individual nanoparticles and atomic clusters, the current capabilities to assemble them into a complex system are insufficient for many practical applications. An objective of this work is to develop a fabrication technology that allows for the simultaneous control of the nanoparticle surface chemistry, elemental distribution, microscale geometry, and large-scale assembly. Using a cellulose structure derived from wood, we fabricate hierarchical porous cellulose scaffolds combining with cerium-doped TiO. This hybrid material serves as the support for atomically dispersed Pt catalysts and is used to successfully decompose ethylene at 0 °C. The fabrication concept developed in this work would allow mitigating the conflict between the required large active surfaces and the difficulties in handling nanopowders in environmental catalysis, including food preservation and indoor air purification. We thus discover a promising route to manufacture multifunctional materials with complex structures by combining a controllable chemical synthesis with the nature-designed wood scaffold.
尽管单个纳米粒子和原子团簇具有优异的催化性能，但目前将它们组装成复杂系统的能力还不足以满足许多实际应用的需求。这项工作的一个目标是开发一种制造技术，使我们能够同时控制纳米粒子的表面化学、元素分布、微尺度几何形状和大规模组装。我们使用源自木材的纤维素结构，制备了具有 Ce 掺杂 TiO2 的分级多孔纤维素支架。这种混合材料可用作原子分散 Pt 催化剂的载体，并成功地在 0°C 下分解乙烯。本工作中开发的制造概念将有助于缓解环境催化（包括食品保鲜和室内空气净化）中所需的大活性表面与纳米粉末处理困难之间的矛盾。因此，我们通过将可控化学合成与天然设计的木材支架相结合，发现了制造具有复杂结构的多功能材料的有前途的途径。
