10.1021/acsami.9b01095.s004 Wenjuan Liu Wenjuan Liu Hongbin Ge Hongbin Ge Xiao Chen Xiao Chen Xiaolong Lu Xiaolong Lu Zhongwei Gu Zhongwei Gu Jinxing Li Jinxing Li Joseph Wang Joseph Wang Fish-Scale-Like Intercalated Metal Oxide-Based Micromotors as Efficient Water Remediation Agents American Chemical Society 2019 surface area Fish-Scale-Like Intercalated Metal Oxide-Based Micromotors azo-dye waste solution MnO 2 surface structure Fe-related Fenton reaction FSI micromotor treatment 5 nm nanoparticles ramsdellite MnO 2 Fe 2 O 3 water remediation applications Mn 2 O 3 Efficient Water Remediation Agents nanomaterial 2019-04-08 00:00:00 Media https://acs.figshare.com/articles/media/Fish-Scale-Like_Intercalated_Metal_Oxide-Based_Micromotors_as_Efficient_Water_Remediation_Agents/8010848 With compelling virtues of a large specific surface area, abundant active sites, and fast interfacial transport, nanomaterials have been demonstrated to be indispensable tools for water remediation applications. Accordingly, micro/nanomotors made by nanomaterials would also benefit from these properties. Though tuning the surface architecture on demand becomes a hot topic in the field of nanomaterials, there are still limited reports on the design of active surface architectures in chemically driven tubular micro/nanomachines. Here, a unique architecture composed of a fish-scale-like intercalated (FSI) surface structure and an active layer with 5 nm nanoparticles is constructed, which composes of Fe<sub>2</sub>O<sub>3</sub> and ramsdellite MnO<sub>2</sub>, Mn<sub>2</sub>O<sub>3</sub>, in the tubular micromotor using a versatile electrodeposition protocol. Tailoring the electrodeposition parameters enables us to modulate the active MnO<sub>2</sub> surface structure on demand, giving rise to a pronounced propulsion performance and catalytic activity. Upon exposure to the azo-dye waste solution, the degradation efficacy greatly raises by around 22.5% with FSI micromotor treatment when compared to the normal compact motors, owing to the synergistic effect between the Fe-related Fenton reaction and a large catalytic area offered by the hierarchically rough inner surface. Such unique micromachines with a large active surface area have great potential for environmental and biomedical applications.