Low temperature micro-solid oxide fuel cell (micro-SOFC) systems are an attractive alternative power source for small-size portable electronic devices due to their high energy efficiency and density. Here, we report on a thermally self-sustainable reformer micro-SOFC assembly. The device consists of a micro-reformer bonded to a silicon chip containing 30 micro-SOFC membranes and a functional glass carrier with gas channels and screen-printed heaters for start-up. Thermal independence of the device from the externally powered heater is achieved by exothermic reforming reactions above 470 degrees C. The reforming reaction and the fuel gas flow rate of the n-butane/air gas mixture controls the operation temperature and gas composition on the micro-SOFC membrane. In the temperature range between 505 degrees C and 570 degrees C, the gas composition after the micro-reformer consists of 12 vol.% to 28 vol.% H-2. An open-circuit voltage of 1.0 V and maximum power density of 47 mW cm(-2) at 565 degrees C is achieved with the on-chip produced hydrogen at the micro-SOFC membranes. (C) 2014 Elsevier B.V. All rights reserved.