Materials: Manganese dioxide (MnO2) (CAS: 1313-13-9) particles (average particle size ~10 µm) were purchased from Alpha Aesar GmbH, Germany (catalog no. A10765, Lot no. J21W020). Hydrogen peroxide (30%) was purchased from Merck, Darmstadt, Germany. Sodium dodecyl sulfate (SDS) was purchased from Sigma-Aldrich. Rhodamine 6G (R6G) was from Alpha Aesar GmbH, Germany. Ultrapure water (Milli-Q) was used in all experiments. External morphology of micromotors was characterized by using a Hitachi S4800 fieldemission scanning electron microscope. Spectrophotometric measurements were carried by using PerkinElmer Lambda 900 UV/VIS/NIR Spectrometer (Norwalk, USA). The videos for motion tracking were recorded at a frame rate of 15 fps using an Olympus BX51 microscope (5X objective) and a Thorlabs DCC1645C compact CMOS camera. The videos were edited by Virtual Dub 1.10.4 software and FiJi software was used to track the speeds of the micromotors.