ABSTRACT
Hydrogen as an energy currency is one of the reliable energy sources for fast-growing global energy consumption. Water electrolysis is a clean-energy technology for hydrogen production in a very high pure form. In recent years, investigations on the design of efficient electrocatalysts for hydrogen evolution reaction (HER) have led to the exploration of 2D nanomaterials as electrocatalysts, which are of great potential alternative to expensive noble metals-based electrocatalysts. 2D electrocatalysts such as 2D metal-organic frameworks, phosphorene, TMDs, TMCs, graphene, graphydine, and hybrids of 2D single-atom catalysts incorporate advantages of morphological structure with multiformity and electrochemical functionality. The above 2D electrocatalysts exhibit excellent HER performance with long-term stability in a wide pH range. In addition, the high surface-to-volume ratio with abundant catalytically active sites exposed on the surface renders 2D nanomaterials to be employed as electrocatalysts in overall water splitting. In this chapter, recent fabrication and electrocatalytic activity of 2D nanomaterials as HER electrocatalysts are discussed in detail.
