Multishelled NiO Hollow Microspheres for High-performance Supercapacitors with Ultrahigh Energy Density and Robust Cycle Life

• DOI: 10.1038/srep33241
• Publication Date: 2016-09-12T11:27:22Z
• Authors: Xinhong Qi; Wenji Zheng; Xiangcun Li; Gaohong He
• Keywords: Non-blocking I/O; Power density

Abstract Multishelled NiO hollow microspheres for high-performance supercapacitors have been prepared and the formation mechanism has investigated. By using resin to absorb Ni 2+ subsequent proper calcinations, shell numbers, spacing exterior structure were facilely controlled via varying synthetic parameters. Particularly, that accurately associated with ion transfer is finely by forming a single or closed double-shells. Among multishelled microspheres, triple-shelled an outer single-shelled show remarkable capacity of 1280 F g −1 at 1 A , still keep high value 704 even 20 . The outstanding performances are attributed its fast ion/electron transfer, specific surface area large space. capacitance gradually increases 108% initial after 2500 cycles, demonstrating stability. Importantly, 3S-NiO-HMS//RGO@Fe 3 O 4 asymmetric supercapacitor shows ultrahigh energy density 51.0 Wh kg power 800 W 78.8% retention 10,000 cycles. Furthermore, can be transferred into high-efficient H 2 generation rate 598.5 mL min catalytic hydrolysis NH BH (AB).