An engineered, self-propelled nanozyme as reactive oxygen species scavenger

The development of enzyme-mimicking nanomaterials (nanozymes) with excellent reactive oxygen species (ROS)-scavenging abilities and low biotoxicity is desired for clinical translation. The use of nanomotors as nanozymes for active ROS elimination is a novel strategy that involves rapid ROS diffusion through autonomous movement. Here, we report an engineered, self-propelled nanozyme based on a Janus Pt/SiO 2 nanomotor with Pt nanoparticle active centers, which possess GPx-like, CAT-like and SOD-like enzyme activities as well as ∙ OH scavenging ability. Nanozymes modified with black phosphorous quantum dots (BPQDs) achieved efficient self-diffusiophoretic motion under physiological concentrations of H 2 O 2 , independent of a fuel source. Moreover, the OH and O 2 - removal ability of BPQDs further improved antioxidant ability of this nanozyme. We hope that such strategy involving self-propulsion will facilitate the development of nanozymes and expand biomedical applications of nanomotors.