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

Abstract:

:Multishelled NiO hollow microspheres for high-performance supercapacitors have been prepared and the formation mechanism has been investigated. By using resin microspheres to absorb Ni(2+) and subsequent proper calcinations, the shell numbers, shell spacing and exterior shell structure were facilely controlled via varying synthetic parameters. Particularly, the exterior shell structure that accurately associated with the ion transfer is finely controlled by forming a single shell or closed exterior double-shells. Among multishelled NiO hollow microspheres, the triple-shelled NiO with an outer single-shelled microspheres show a remarkable capacity of 1280 F g(-1) at 1 A g(-1), and still keep a high value of 704 F g(-1) even at 20 A g(-1). The outstanding performances are attributed to its fast ion/electron transfer, high specific surface area and large shell space. The specific capacitance gradually increases to 108% of its initial value after 2500 cycles, demonstrating its high stability. Importantly, the 3S-NiO-HMS//RGO@Fe3O4 asymmetric supercapacitor shows an ultrahigh energy density of 51.0 Wh kg(-1) at a power density of 800 W kg(-1), and 78.8% capacitance retention after 10,000 cycles. Furthermore, multishelled NiO can be transferred into multishelled Ni microspheres with high-efficient H2 generation rate of 598.5 mL H2 min(-1) g(-1)Ni for catalytic hydrolysis of NH3BH3 (AB).

journal_name

Sci Rep

journal_title

Scientific reports

authors

Qi X,Zheng W,Li X,He G

doi

10.1038/srep33241

subject

Has Abstract

pub_date

2016-09-12 00:00:00

pages

33241

issn

2045-2322

pii

srep33241

journal_volume

6

pub_type

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