Highly Efficient and Stable Hydrogen Evolution from Natural Seawater by Boron-Doped Three-Dimensional Ni2P-MoO2 Heterostructure Microrod Arrays

The rational design of highly active and stable electrocatalyststoward the hydrogen evolution reaction (HER) is highly desirable butchallenging in seawater electrolysis. Herein we propose a strategyof boron-doped three-dimensional Ni2P-MoO2 heterostructure microrod arrays that exhibit excellent catalyticactivity for hydrogen evolution in both alkaline freshwater and seawaterelectrolytes. The incorporation of boron into Ni2P-MoO2 heterostructure microrod arrays could modulate the electronicproperties, thereby accelerating the HER. Consequently, the B-Ni2P-MoO2 heterostructure microrod array electrocatalystexhibits a superior catalyst activity for HER with low overpotentialsof 155, 155, and 157 mV at a current density of 500 mA cm(-2) in 1 M KOH, 1 M KOH + NaCl, and 1 M KOH + seawater, respectively.It also exhibits exceptional performance for HER in natural seawaterwith a low overpotential of 248 mV at 10 mA cm(-2) and a long-lasting lifetime of over 100 h.

Automated summary

In this study, a rational design of boron-doped three-dimensional Ni2P-MoO2 heterostructure microrod arrays was proposed for efficient hydrogen evolution reaction (HER) in both alkaline freshwater and seawater electrolytes. The incorporation of boron into the Ni2P-MoO2 heterostructure microrod arrays can modulate the electronic properties and enhance the catalytic activity for HER. The B-Ni2P-MoO2 heterostructure microrod array electrocatalyst exhibited superior catalyst activity with low overpotentials and exceptional performance in both seawater and natural seawater environments.