Engineering heterostructured Ni@Ni(OH)_(2) core-shell nanomaterials for synergistically enhanced water electrolysis

Heterostructure engineering of electrocatalysts provides a fascinating platform to reasonably manipulate the physicochemical properties of nanomaterials and further improve their catalytic efficiency for water electrolysis.However,it still remains a huge challenge to construct welldesigned core-shell heterostructured catalysts and identify the key role of components for synergistic catalysis.Herein,a melted polymeric salt tactics was innovatively developed to synthesize heterostructured Ni@Ni(OH)_(2) core-shell nanomaterials supported on porous carbon(named Ni@Ni(OH)_(2)/PC),wherein well-defined Ni(OH)_(2)-Ni heterostructure plays a pivotal role in improving electrocatalytic activity for water reduction and oxidation.Besides,the stable porous carbon support functions as a highway for continuous electron transfer between Ni and Ni(OH)_(2),and simultaneously enables the full exposure of accessible active sites.The fabricated Ni@Ni(OH)_(2)/PC exhibits outstanding bifunctional electrocatalytic performance for overall water splitting(η_(10)=1.55 V) with a good long-time stability.This work sheds new light on the design of engineering heterostructure of active bifunctional electrocatalysts for efficient energy conversion system.