Abstract
Hydrogen is one of the most promising alternatives for fossil fuels. However, the power output of hydrogen/oxygen fuel cells is often restricted by mass transport limitations of the substrate. Here, we present a dual-gas breathing H 2 /air biofuel cell that overcomes these limitations. The cell is equipped with a hydrogen-oxidizing redox polymer/hydrogenase gas-breathing bioanode and an oxygen-reducing bilirubin oxidase gas-breathing biocathode (operated in a direct electron transfer regime). The bioanode consists of a two layer system with a redox polymer-based adhesion layer and an active, redox polymer/hydrogenase top layer. The redox polymers protect the biocatalyst from high potentials and oxygen damage. The bioanodes show remarkable current densities of up to 8 mA cm -2 . A maximum power density of 3.6 mW cm -2 at 0.7 V and an open circuit voltage of up to 1.13 V were achieved in biofuel cell tests, representing outstanding values for a device that is based on a redox polymer-based hydrogenase bioanode.
Originalsprache | Englisch |
---|---|
Aufsatznummer | 4715 |
Fachzeitschrift | Nature Communications |
Jahrgang | 9 |
Ausgabenummer | 1 |
DOIs | |
Publikationsstatus | Veröffentlicht - 1 Dez. 2018 |
Extern publiziert | Ja |