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Portable electronic devices are already an indispensable part of our dailylife; and their increasing number and demand for higher performance is becominga challenge for the research community. In particular, a major concern is theway to efficiently power these energy-demanding devices, assuring long gridindependency with high efficiency, sustainability and cheap production. In thiscontext, technologies beyond Li-ion are receiving increasing attention, amongwhich the development of micro solid oxide fuel cells ({\mu}SOFC) stands out.In particular, {\mu}SOFC provides a high energy density, high efficiency andopens the possibility to the use of different fuels, such as hydrocarbons. Yet,its high operating temperature has typically hindered its application asminiaturized portable device. Recent advances have however set a completely newrange of lower operating temperatures, i.e. 350-450C, as compared to thetypical >900C needed for classical bulk SOFC systems. In this work, acomprehensive review of the status of the technology is presented. The mainachievements, as well as the most important challenges still pending arediscussed, regarding (i.) the cell design and microfabrication, and (ii.) theintegration of functional electrolyte and electrode materials. To conclude, thedifferent strategies foreseen for a wide deployment of the technology as newportable power source are underlined.

Micro solid oxide fuel cells: a new generation of micro-power sources for portable applications