Defects and morphology engineering for constructing V S-Ni 3 S 2 @V S-Cu 2 S nanotube heterojunction arrays toward efficient bifunctional electrocatalyst for overall water splitting

Key Words:MOS2; NANOPARTICLES; CATALYST; ZINC

Abstract:The development of highly active, stable and inexpensive electrocatalysts for hydrogen production by defects and morphology engineering remains a great challenge. Herein, S vacancies -rich Ni 3 S 2 @Cu 2 S nanotube heterojunction arrays were in -situ grown on copper foam (V S -Ni 3 S 2 @V S -Cu 2 S NHAs/CF) for efficient electrocatalytic overall water splitting. With the merits of nanotube arrays and efficient electronic modulation drived by the 0D vacancy defect and 2D heterojunction defect, the resultant V S -Ni 3 S 2 @V S -Cu 2 S NHAs/CF electrocatalyst exhibits excellent electrocatalytic activity with a low overpotential of 47 mV for the hydrogen evolution reaction (HER) at 10 mA cm -2 current density, and 263 mV for the oxygen evolution reaction (OER) at 50 mA cm -2 current density, as well as a cell voltage of 1.48 V at 10 mA cm -2 . Moreover, the nanotube heterojunction arrays endows V S -Ni 3 S 2 @V S -Cu 2 S NHAs/CF with outstanding stability in long-term catalytic processes, as confirmed by the continuous chronopotentiometry tests at current densities of 10 mA cm -2 for 100 h. (c) 2024 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.

Volume:94

Issue:

Translation or Not:no