Teknologian Tutkimuskeskus Vtt Oy

Valtion Teknillinen Tutkimuskeskus

Matti Valkiainen

Liisa Viikari

Pia Qvintus-Leino

Kirsi Immonen

Maria Smolander

Harry Boer

Anu Vaari

Anu Koivula

Ville-Mikko Ojala

A multilayered structure suitable as an electrode in a power source and a method of producing the same. The structure comprises a conductive laminar layer; and an enzyme layer containing an essentially dry enzyme capable of oxidizing or dehydrogenating carbohydrate material under suitable conditions. Because the enzymatic anode layer and the fuel containing layer are not interacting during the production and since they are kept latent during storage time, the power source will remain stable for extended periods of time, thus increasing the utility of the power source.

Multilayered structure comprising an enzyme layer

A thin film structure, method of producing it and the use thereof. The thin film structure comprises a substrate with a thin conductive layer containing an oxidizing enzyme mixed with an electron transfer mediator. The thin layer is protected against wetting to allow for its storage in dry conditions and further being sufficiently porous to allow for immediate activation of the oxidizing enzyme when contacted with an aqueous solution. The thin film can be used as a cathode in electrochemical fuel cells.

Thin film structures

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Espoo, Finland

Matti Valkiainen