A low-temperature co-fired ceramic micro-reactor system for high-efficiency on-site hydrogen production

Jiang, Bo; Maeder, Thomas; Santis-Alvarez, Alejandro J.; Poulikakos, Dimos; Muralt, Paul

doi:10.1016/j.jpowsour.2014.09.084

Cited by 16 publications

(15 citation statements)

References 48 publications

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“…Silicon technology is energetically a little more efficient, around few tens of mW for 200 º C [27,28], but the fabrication process is extremely expensive and time consuming. An alternative can be the ceramic technology because it is cheaper, but in this case the power consumption increases excessively on the order of hundred times more [29,30], as well than on glass-based devices [31]. Therefore, the methodology here proposed can be considered like a good alternative to both technologies, reaching a low-consumption and low-cost sensor platform.…”

Section: Resultsmentioning

confidence: 99%

Fabrication, Performances and Aging of Flexible Gas Sensor Platforms

Medina-Rodriguez¹,

Ramos²,

Vescio³

et al. 2015

JMSE-B

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Flexible electronics are attracting much interest in gas sensor field on on-site monitoring applications due to their wear ability, lightweight and low-cost production. These performances are fully accomplished by silver-based platforms, but silver corrosion represents the main drawback for the integrity of the devices. In this work, self-heating sensor platforms fabricated by screen-and inkjet-printing techniques have been developed. The reliability of both types of sensors has been tested by long-term lifetime characterization and aging tests. These tests proved that the actuation time is interrupted by silver corrosion phenomena in screen-printing devices and by hot spots in inkjet-printing ones. Appropriate solutions regarding isolation and design improvements achieved not only an increase of lifetime and reliability, but also a decrease of power consumption.

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Section: Resultsmentioning

confidence: 99%

Fabrication, Performances and Aging of Flexible Gas Sensor Platforms

Medina-Rodriguez¹,

Ramos²,

Vescio³

et al. 2015

JMSE-B

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“…20 In this work, the catalytic partial oxidation of propane for producing hydrogen was used as the model reaction. Ru-containing nanoparticles on inert ceramic supports were applied as catalysts (see Fig.…”

Section: High-temperature Microreactors For Hydrogen Productionmentioning

confidence: 99%

Fine structuration of low-temperature co-fired ceramic (LTCC) microreactors

et al. 2015

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The development of microreactors that operate under harsh conditions is always of great interest for many applications. Here we present a microfabrication process based on low-temperature co-fired ceramic (LTCC) technology for producing microreactors which are able to perform chemical processes at elevated temperature (>400°C) and against concentrated harsh chemicals such as sodium hydroxide, sulfuric acid and hydrochloric acid. Various micro-scale cavities and/or fluidic channels were successfully fabricated in these microreactors using a set of combined and optimized LTCC manufacturing processes. Among them, it has been found that laser micromachining and multi-step low-pressure lamination are particularly critical to the fabrication and quality of these microreactors. Demonstration of LTCC microreactors with various embedded fluidic structures is illustrated with a number of examples, including micro-mixers for studies of exothermic reactions, multiple-injection microreactors for ionone production, and high-temperature microreactors for portable hydrogen generation. IntroductionChemical microreactors are a type of meso-scaled reaction systems that have fluidic channels with characteristic dimensions in the sub-millimeter range. By combining process intensification concepts with microfabrication techniques, these microreactors have been rapidly developed to perform liquid/gas phase chemical reactions, particularly the quasiinstantaneous endothermic or exothermic ones.1,2 Ceramic materials in general feature high chemical and thermal stability. Hence they are very preferable to be used as reactor construction materials, especially for reactors involved with high temperature and/or harsh chemical reactions. be used as the embedded fluidic structures (e.g. channels or cavities) get easily damaged in the stacked LTCC tapes by the high lamination temperature and/or pressure, causing sagging, tearing and cracking issues. Several approaches have been proposed so far in order to reduce these deformations and improve the quality of integrated LTCC fluidic structures. One method is using temporary inserts to introduce mechanical supports to the LTCC cavities to avoid deformation and/or sagging during lamination. These inserts, usually solid flexible objects, 23 are removed right after lamination. However, the removal of inserts from the laminate can cause permanent damage to these fluidic structures. Besides, this method is not applicable for fabricating fully embedded fluidic channels. Alternatively, a chemical-assisted lamination process has been proposed that enables low-pressure and/or lowtemperature bonding of LTCC green tapes. Roosen et al. 24used double-sided adhesive tape that contains acrylate adhesives and a polyethylene terephthalate (PET) film to ensure temporary binding of green tapes under a low lamination pressure at ambient temperature. Upon heating (40-60°C), these adhesives, together with the binders in the LTCC green tapes, soften and join the laminates through capillary forces. Aside from adhesives, ...

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“…We believe that such homogeneity can be further improved through enhancing the in-plane thermal conduction at the hot-zone. For example, one may add a thermally conductive metallization layer in the LTCC substrate for thermal spreading [47], or by bonding a discrete heat spreader of thermally conductive materials such as alumina.…”

Section: Thermal Distributionmentioning

confidence: 99%

“…One example in the use of the LTCC meso-hotplate is a high temperature micro-reactor developed in our group for hydrogen production [47,59]. The LTCC hotplate provides mechanical attachment, electrical/fluidic connections and the necessary thermal energy for the hydrogen reforming reactions.…”

Section: Applicationsmentioning

confidence: 99%