Reported herein is an electrode for dihydrogen (H2) oxidation, and it is based on [NiFe]Hydrogenase from Citrobacter sp. S-77 ([NiFe]S77). It has a 637 times higher mass activity than Pt (calculated based on 1 mg of [NiFe]S77 or Pt) at 50 mV in a hydrogen half-cell. The [NiFe]S77 electrode is also stable in air and, unlike Pt, can be recovered 100 % after poisoning by carbon monoxide. Following characterization of the [NiFe]S77 electrode, a fuel cell comprising a [NiFe]S77 anode and Pt cathode was constructed and shown to have a a higher power density than that achievable by Pt.

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Reported herein is an electrode for dihydrogen (H 2 ) oxidation, and it is based on [NiFe]Hydrogenase from Citrobacter sp. S-77 ([NiFe] S77 ). It has a 637 times higher mass activity than Pt (calculated based on 1 mg of [NiFe] S77 or Pt) at 50 mV in a hydrogen half-cell. The [NiFe] S77 electrode is also stable in air and, unlike Pt, can be recovered 100 % after poisoning by carbon monoxide. Following characterization of the [NiFe] S77 electrode, a fuel cell comprising a [NiFe] S77 anode and Pt cathode was constructed and shown to have a a higher power density than that achievable by Pt.

The construction of a fuel cell using the [NiFe]hydrogenase (H2ase) S‐77 as the hydrogen anode is described by P. Ogo et al. in their Communication on The enzyme has a mass activity that is over 600 times greater than that of platinum, is stable to air, and can be recovered after CO poisoning.

Der Bau einer Brennstoffzelle mit der [NiFe]Hydrogenase (H2ase) S‐77 als Wasserstoffanode wird von P. Ogo et al. in der Zuschrift auf vorgestellt. Die Massenaktivität des Enzyms ist mehr als 600‐mal größer als die von Platin, es ist an Luft stabil und kann nach Vergiftung durch CO zurückgewonnen werden.