Recent progress in self-supported nanoarrays with diverse substrates for water splitting and beyond

Abstract

Abstract Electrocatalytic water splitting plays a paramount importance role in the hydrogen production as a green renewable energy technology. Therefore, developing highly efficient and durable electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) have brought great interest. Self-supported nanoarray electrocatalysts are attracting intense attention owing to the larger active areas and lower reaction overpotential compared with the free standing particles. Herein, the recent progress regarding self-supported nanoarray electrocatalysts for water-splitting are systematically overviewed, with a special focus on the morphology including 1D, 2D, and heterostructure of the nanoarray, as well as the design and preparation strategy of the substrates. Furthermore, the challenges and opportunities of the self-supported nanoarray electrocatalysts for water splitting were also discussed. Moreover, the promising application of self-supported nanoarray electrocatalysts to CO2 reduction reaction (CO2RR) and nitrogen reduction reaction (NRR) are also investigated.