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The use of highly active and robust catalysts is crucial for producing greenhydrogen by water electrolysis as we strive to achieve global carbonneutrality. Noble metals like platinum are currently used in industry for thehydrogen evolution reaction (HER), but suffer from scarcity, high price andunsatisfied performance and stability at large current density, restrictingtheir large scale implementations. Here we report the synthesis of a new typeof monolithic catalyst (MC) consisting of a metal disulfide (e.g., TaS2)catalyst vertically bonded to a conductive substrate of the same metal bystrong covalent bonds. These features give the MC a mechanically robust andelectrically near zero resistance interface, leading to an outstanding HERperformance including rapid charge transfer and excellent durability, togetherwith a low overpotential of 398 mV to achieve a current density of 2,000 mAcm-2 as required by industry. The Ta TaS2 MC has a negligible performance decayafter 200 h operation at large current densities. In light of its uniqueinterface and the various choice of metal elements giving the same structure,such monolithic materials may have broad uses besides catalysis.

A Ta-TaS2 monolithic catalyst with robust and metallic interface for superior hydrogen evolution