Constructing High Performance Hybrid Battery and Electrocatalyst by Heterostructured NiCo₂O₄@NiWS Nanosheets

It is very important to design hybrid core–shell structured electrode materials to obtain superior electrochemical and electrocatalytic performance. In this work, we reported hybrid NiCo 2 O 4 @NiWS nanostructures through a facile solution approach. The as-synthesized product can be used directly as the electrode materials for the hybrid battery and the electrocatalysts. The as-synthesized hybrid NiCo 2 O 4 @NiWS structure exhibits a high specific capacitance 580 C g –1 at current density of 1 A g –1 . The as-assembled supercapacitor device shows high energy density of 41.1 Wh kg –1 at a power density of 1032.2 W kg –1 . Moreover, NiCo 2 O 4 @NiWS structure possesses excellent oxygen evolution reaction with small overplant of 290 mV and excellent cycle stability.