Miniaturized energy storage devices are essential to power the growing number and variety of microelectronic technologies. Here, a concept of self-propelled microscale energy storage elements that can move, reach, and power electronic circuits is reported. Microrockets consisting of a nickel sulfide (NiS) outer layer and a Pt inner layer are prepared by template-assisted electrodeposition, and designed to store energy through NiS-mediated redox reactions and propel via the Pt-catalyzed decomposition of H2 O2 fuel. Scanning electrochemical microscopy allows visualizing and studying the energy storage ability of a single microrocket, revealing its pseudocapacitive nature. This proves the great potential of such technique in the field of micro/nanomotors. On-demand delivery of energy storage units to electronic circuits has been demonstrated by releasing microrockets on an interdigitated array electrode as an example of electronic circuit. Owing to their self-propulsion ability, they reach the active area of the electrode and, in principle, power its functions. These autonomously moving energy storage devices will be employed for next-generation electronics to store and deliver energy in previously inaccessible locations.

Center for Advanced Functional Nanorobots Department of Inorganic Chemistry Faculty of Chemical Technology University of Chemistry and Technology Prague Prague 166 28 Czech Republic

Center for Nanorobotics and Machine Intelligence Department of Chemistry and Biochemistry Mendel University in Brno Brno CZ 613 00 Czech Republic

Department of Chemical and Biomolecular Engineering Yonsei University Seodaemun Gu Seoul 03722 South Korea

Department of Medical Research China Medical University Hospital China Medical University Taichung 40402 Taiwan

Future Energy and Innovation Laboratory Central European Institute of Technology Brno University of Technology Brno 61200 Czech Republic

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