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Issue 15, 2016
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Standalone ethanol micro-reformer integrated on silicon technology for onboard production of hydrogen-rich gas

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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 cm2 cm−2 and per volume of 320 cm2 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).

Graphical abstract: Standalone ethanol micro-reformer integrated on silicon technology for onboard production of hydrogen-rich gas

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Supplementary files

Article information


Submitted
02 May 2016
Accepted
28 Jun 2016
First published
28 Jun 2016

Lab Chip, 2016,16, 2900-2910
Article type
Paper

Standalone ethanol micro-reformer integrated on silicon technology for onboard production of hydrogen-rich gas

D. Pla, M. Salleras, A. Morata, I. Garbayo, M. Gerbolés, N. Sabaté, N. J. Divins, A. Casanovas, J. Llorca and A. Tarancón, Lab Chip, 2016, 16, 2900
DOI: 10.1039/C6LC00583G

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