Highly Efficient and Stable Hydrogen Evolution from Natural Seawater by Boron-Doped Three-Dimensional Ni<sub>2</sub>P–MoO<sub>2</sub> Heterostructure Microrod Arrays
Le Phuc Phan, Thuy Tien Nguyen Tran, Thuy‐Kieu Truong, Jianmin Yu, Hanh-Vy Tran Nguyen, Thang Bach Phan, Nhu Hoa Thi Tran, Nhu Hoa Thi Tran, Ngoc Quang Tran, Ngoc Quang Tran
Abstract
The rational design of highly active and stable electrocatalysts toward the hydrogen evolution reaction (HER) is highly desirable but challenging in seawater electrolysis. Herein we propose a strategy of boron-doped three-dimensional Ni 2 P–MoO 2 heterostructure microrod arrays that exhibit excellent catalytic activity for hydrogen evolution in both alkaline freshwater and seawater electrolytes. The incorporation of boron into Ni 2 P–MoO 2 heterostructure microrod arrays could modulate the electronic properties, thereby accelerating the HER. Consequently, the B–Ni 2 P–MoO 2 heterostructure microrod array electrocatalyst exhibits a superior catalyst activity for HER with low overpotentials of 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 seawater with a low overpotential of 248 mV at 10 mA cm –2 and a long-lasting lifetime of over 100 h.