title: [NiFe]Hydrogenase from Citrobacter sp. S-77 surpasses platinum as an electrode for H2 oxidation reaction.
abstract: 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.
authors.affiliation: International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395 (Japan) http://www.cstm.kyushu-u.ac.jp/ogo/; Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395 (Japan).
authors.forename: Takahiro
authors.initials: T
authors.lastname: Matsumoto
authors.forename: Shigenobu
authors.initials: S
authors.lastname: Eguchi
authors.forename: Hidetaka
authors.initials: H
authors.lastname: Nakai
authors.forename: Takashi
authors.initials: T
authors.lastname: Hibino
authors.forename: Ki-Seok
authors.initials: KS
authors.lastname: Yoon
authors.forename: Seiji
authors.initials: S
authors.lastname: Ogo
mesh_terms: D001674:Bioelectric Energy Sources; D002954:Citrobacter / Q000201:enzymology*; D058266:Dielectric Spectroscopy; D004566:Electrodes; D006859:Hydrogen / Q000737:chemistry*; D006864:Hydrogenase / Q000737:chemistry*; D010084:Oxidation-Reduction; D010984:Platinum / Q000737:chemistry*
chemical_list: D010984:Platinum; D006859:Hydrogen; C043296:nickel-iron hydrogenase; D006864:Hydrogenase
keywords: anode; enzymes; fuel cells; hydrogen; nickel