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Abstract

The search for highly efficient and low-cost catalysts based on earth abundant elements is one of the main driving forces in organic and inorganic chemistry. In this work, we introduce the concept of moir & eacute; metal for hydrogen evolution reaction (HER). Using twisted NbS2 as an example, we show that the spatially varying interlayer coupling leads to a corresponding variation of Gibbs free energy for hydrogen absorption at different sites on the moir & eacute; superlattice. Remarkably, as a HER catalyst, twisted NbS2 is shown to cover the thermoneutral volcano peak, exceeding the efficiency of the current record platinum. The richness of local chemical environment in moir & eacute; structures provides a versatile method for designing superior catalysts.