Yingshuang Xu†, Yumeng Fo‡, Honghao Lv†, Xuejing Cui†, Guangbo Liu*,†, Xin Zhou*‡, and Luhua Jiang*†
† Nanomaterial & Electrocatalysis Laboratory, College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
‡ College of Environment and Chemical Engineering, Dalian University, Dalian 116622, P. R. China
ABSTRACT:
To design high-performance hydrogen evolution reactions (HER) catalysts is crucial for seawater splitting. Herein, we demonstrate a facile Anderson-type polyoxometalates-assisted synthesis route to prepare defect-rich doped 1T/2H-MoSe2 nanosheets. The optimized defect-rich doped 1T/2H-MoSe2 nanosheets display a low overpotential of 116 and 274 mV at 10 mA cm-2 in acidic and seawater media for the HER, respectively. A magnesium (Mg)/seawater battery fabricated with the defect-rich doped 1T/2H-MoSe2 nanosheets cathode displaying a peak power density of 7.69 mW cm-2 and a stable power generation over 24 h. The experimental and theoretical investigations reveal that the superior HER and battery performances of the heteroatom-doped MoSe2 nanosheets are attributed to both the improved intrinsic catalytic activity (effective activation of water and favorable subsequent hydrogen desorption) and the abundant active sites, benefiting from the favorable catalytic factors of doped heteroatom, 1T phase and defects. This work provides an intriguing structural modulation strategy to design high-performance catalysts toward both HER and Mg/seawater battery.
KEYWORDS: Anderson-type polyoxometalate; MoSe2 nanosheets; hydrogen evolution reaction; seawater splitting; Mg/seawater battery
*Email: liugb@qust.edu.cn; zhouxin@dlu.edu.cn; luhuajiang@qust.edu.cn
