By latching a nickel compound onto multiwalled carbon nanotubes, researchers in France have created a new catalytic material as proton-exchange membrane for electrolyzers and fuel cells.By immobilizing their catalyst on nanotubes, the researchers were able to get it to work under aqueous conditions—a requirement for its practical use in proton-exchange membrane devices. The nanotube-catalyst material is claimed to exhibit extreme stability, standing up to more than 100,000 turnovers for H2 production and more than 35,000 turnovers for the reverse reaction.