title: Standalone ethanol micro-reformer integrated on silicon technology for onboard production of hydrogen-rich gas.
abstract: A novel design of a silicon-based micro-reformer for onboard hydrogen generation from ethanol is presented in this work. The micro-reactor is fully fabricated with mainstream MEMS technology and consists of an active low-thermal-mass structure suspended by an insulating membrane. The suspended structure includes an embedded resistive metal heater and an array of ca. 20k vertically aligned through-silicon micro-channels per square centimetre. Each micro-channel is 500 μm in length and 50 μm in diameter allowing a unique micro-reformer configuration that presents a total surface per projected area of 16 cm(2) cm(-2) and per volume of 320 cm(2) cm(-3). The walls of the micro-channels become the active surface of the micro-reformer when coated with a homogenous thin film of Rh-Pd/CeO2 catalyst. The steam reforming of ethanol under controlled temperature conditions (using the embedded heater) and using the micro-reformer as a standalone device are evaluated. Fuel conversion rates above 94% and hydrogen selectivity values of ca. 70% were obtained when using operation conditions suitable for application in micro-solid oxide fuel cells (micro-SOFCs), i.e. 750 °C and fuel flows of 0.02 mlL min(-1) (enough to feed a one watt power source).
authors.affiliation: Department of Advanced Materials for Energy, Catalonia Institute for Energy Research, Jardí de les Dones de Negre 1, 2nd floor, 08930 Sant Adrià del Besós, Barcelona, Spain. atarancon@irec.cat.
authors.forename: D
authors.initials: D
authors.lastname: Pla
authors.forename: M
authors.initials: M
authors.lastname: Salleras
authors.forename: A
authors.initials: A
authors.lastname: Morata
authors.forename: I
authors.initials: I
authors.lastname: Garbayo
authors.forename: M
authors.initials: M
authors.lastname: Gerbolés
authors.forename: N
authors.initials: N
authors.lastname: Sabaté
authors.forename: N J
authors.initials: NJ
authors.lastname: Divins
authors.forename: A
authors.initials: A
authors.lastname: Casanovas
authors.forename: J
authors.initials: J
authors.lastname: Llorca
authors.forename: A
authors.initials: A
authors.lastname: Tarancón