Key Words:EVOLUTION; ELECTROCATALYST; IDENTIFICATION; PERFORMANCE; MECHANISM; CATALYSTS; ARRAYS; OXYGEN; ATOMS; CO

Abstract:The development of water splitting electrocatalysts with earth-abundant materials capable of delivering high current density is crucial for sustainable H2 2 production. However, the mass transfer including reactants and bubbles usually suffered from the shielding effect of gas adhesion under such circumstance. Here, we report a surface engineering strategy over amorphous molybdenum sulfide (a-MoSx) x ) to synergistically boost its generation and departure of gas bubbles. To begin with, a hydrophilic surface featuring hydroxy groups was constructed via palladium-doping induced sulfur vacancies on a-MoSx, x , which could enhance the local access of aqueous reactant. Furthermore, the departure of gas bubbles could be accelerated by regulating the roughness of the synthesized Pd-MoSx(OH)y x (OH) y nanoarrays. For demonstration purpose of practical applications, the bifunctional PdMoSx(OH)y x (OH) y nanoarrays could deliver a high current density of 1000 mA cm- 2 at 1.99 V for overall water splitting over 100 h.

Volume:497

Issue:

Translation or Not:no