Core-branched NiCo2S4@CoNi-LDH heterostructure as advanced electrode with superior energy storage performance

Constructing hierarchical core-branched configuration from the well-known multicomponent metal hydroxides/sulfides is a way to further tune and utilize distinctive species. Herein, we develop a novel core-branched heterostructure based on NiCo2S4 nanosheets (NCS NSs) branched on CoNi-LDH nanosheets (CN-LDH NSs), which involves facile hot-air oven-based and electro-deposition methods. The CN-LDH NSs acts as the host stem and supports NCS NSs electroactive species to provide reliable electrical contact for electron transfer; whereas the highly active NCS NSs "branch" on the outside of CN-LDH NSs "core" provide sufficient access to active sites, and electron transport regions for the valence transitions of Ni2+/Ni3+ and Co2+/Co3+/Co4+ during redox process. The CN-LDH@NCS NSs electrode achieves a notable specific capacity of 1385.7 C g(-1) at 1 A g(-1), and good rate capability. Additionally, the as-prepared CN-LDH@NCS NSs//AC device exhibits a high energy density of 93.21 Wh kg(-1) at a power density of 1.045 kW kg(-1) and satisfying cycling lifespan, with nearly 81.49% capacitance retention after 7000 cycles (20 A g(-1)).