In this work, a porous core–shell composite composed of reduced graphene oxide (rGO)-wrapped SnO 2 fibers (SnO 2 fibers/rGO composite) was fabricated through electrospinning assisted by pyrolysis. The special core–shell structure showed that porous SnO 2 fibers as the “core” were completely protected by multilayer rGO as the “shell.” Lithiation of SnO 2 occurred through Li diffusion through the rGO wrapped into the SnO 2 fibers, and natural void space facilitated SnO 2 expansion upon lithiation. This unique structure effectively prevented the aggregation and pulverization of SnO 2 fibers during lithiation and delithiation. The SnO 2 fibers/rGO composite electrode presented a super-high discharge capacity of 2,141 mAh g -1 at a current density of 0.4 A g -1 , 1,858 mAh g -1 at 0.8 A g -1 , 1,520 mAh g -1 at 1.6 A g -1 , and 874 mAh g -1 at 2.0 A g -1 after 10 cycles. The electrode showed a discharge capacity of 658 mAh g -1 at a current density of 4 A g -1 after 1,000 cycles.
Abstract In this paper, SnO 2 fibers with three-dimensional (3D) interconnected structure were successfully obtained by a simple electrospinning technique with both high quality and reproducibility. The microstructure, physicochemical properties were characterized (FT-IR, XRD, SEM, HR-TEM, TG-DSC, N 2 -BET, XPS, H 2 -TPR, O 2 -TPD) extensively. The catalytic activity was tested in temperature-programmed oxidation (TPO) of model soot. The influence of the heat-treated temperature on the catalysts physicochemical properties and reactivity was evaluated. The fibers were fluffy and self-supporting after heat-treated which could provide a beneficial environment favored by soot catalytic combustion. SnO 2 fibers exhibited good thermal stability in phase structures and morphologies at least 900 °C. The SnF-500 exhibited the highest catalytic activity with T 10 , T 50 and T 90 at 410 °C, 450 °C and 474 °C. With the increase in the sintering temperature, the crystallinity of SnO 2 fiber increases and the Sn–O-Sn bond strengthens, resulting in a decrease in the catalytic activity of the catalyst as the BET surface area and surface oxygen decrease. Our studies provide insights into SnO 2 fibers for soot catalytic. Graphic abstract
危险品化学品经营许可证（带存储）