Core–Sheath CeO2/SiO2 Nanofibers as Nanoreactors for Stabilizing Sinter-Resistant Pt, Enhanced Catalytic Oxidation and Water Remediation
Yunpeng Wang, Zhihui Li, Wanlin Fu, Yueming Sun, Yunqian Dai
Advanced Fiber Materials ›› 2022, Vol. 4 ›› Issue (5) : 1278-1289.
Core–Sheath CeO2/SiO2 Nanofibers as Nanoreactors for Stabilizing Sinter-Resistant Pt, Enhanced Catalytic Oxidation and Water Remediation
One-dimensional (1D) oxide nanofibers have attracted much attention in recent years but are still hampered by the difficulty in the expansion to 2D or 3D dimensions. Herein, ultrathin CeO2/SiO2 nanofibers with intriguing core–sheath structures were simply fabricated by a facile single-spinneret electrospinning method and were subsequently integrated as 2D nanofibrous mats and 3D sponges. Introducing secondary oxide (i.e., SiO2) could induce a unique fine structure and further inhibit the sintering of CeO2 nanocrystals, endowing the resultant dual-oxide nanofibers with high porosity, good flexibility, and enriched oxygen defects. Benefiting from the core–sheath structure and dual-oxide component, the CeO2/SiO2 nanofibers could stabilize 2.59 nm-Pt clusters against sintering at 600 °C. Once assembled into a 2D mat, the nanofibers could efficiently decrease the soot oxidation temperature by 63 °C. Moreover, the core–sheath CeO2/SiO2 nanofibers can be readily integrated with graphene nanosheets into a 3D sponge via a gas foaming protocol, showing 218.5 mg/g of adsorption capacity toward Rhodamine B molecules. This work shed lights on the versatile applications of oxide nanofibers toward clean energy ultilization and low-carbon development.
Ultrathin core–sheath CeO2/SiO2 nanofibers were fabricated by a facile single-spinneret electrospinning method and were subsequently integrated as 2D nanofibrous mats and 3D sponges, exhibiting desirable efficiency in heterogeneous catalysis and water remediation.
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