title: From hydrogenases to noble metal-free catalytic nanomaterials for H2 production and uptake.
abstract: Interconversion of water and hydrogen in unitized regenerative fuel cells is a promising energy storage framework for smoothing out the temporal fluctuations of solar and wind power. However, replacement of presently available platinum catalysts by lower-cost and more abundant materials is a requisite for this technology to become economically viable. Here, we show that the covalent attachment of a nickel bisdiphosphine-based mimic of the active site of hydrogenase enzymes onto multiwalled carbon nanotubes results in a high-surface area cathode material with high catalytic activity under the strongly acidic conditions required in proton exchange membrane technology. Hydrogen evolves from aqueous sulfuric acid solution with very low overvoltages (20 millivolts), and the catalyst exhibits exceptional stability (more than 100,000 turnovers). The same catalyst is also very efficient for hydrogen oxidation in this environment, exhibiting current densities similar to those observed for hydrogenase-based materials.
authors: Commissariat à l'Energie Atomique (CEA), Institut Rayonnement Matière de Saclay, Service de Physique et Chimie des Surfaces et Interfaces, Chemistry of Surfaces and Interfaces group, F-91191 Gif sur Yvette Cedex, France.
authors: Alan
authors: A
authors: Le Goff
authors: Vincent
authors: V
authors: Artero
authors: Bruno
authors: B
authors: Jousselme
authors: Phong Dinh
authors: PD
authors: Tran
authors: Nicolas
authors: N
authors: Guillet
authors: Romain
authors: R
authors: Métayé
authors: Aziz
authors: A
authors: Fihri
authors: Serge
authors: S
authors: Palacin
authors: Marc
authors: M
authors: Fontecave
mesh_terms: D040761:Biomimetic Materials / Q000737:chemistry; D002384:Catalysis; D020134:Catalytic Domain; D055664:Electrochemical Techniques; D004566:Electrodes; D006859:Hydrogen / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D006864:Hydrogenase / Q000737:chemistry; D008024:Ligands; D037742:Nanotubes, Carbon / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D010084:Oxidation-Reduction; D010720:Phosphines / Q000737:chemistry; D011522:Protons; D013464:Sulfuric Acids / Q000737:chemistry
chemical_list: D008024:Ligands; D037742:Nanotubes, Carbon; D010720:Phosphines; D011522:Protons; D013464:Sulfuric Acids; D009532:Nickel; D006859:Hydrogen; D006864:Hydrogenase; C033158:sulfuric acid