Self-templated formation of (NiCo)9 S8 yolk-shelled spheres for high-performance hybrid supercapacitors

Nanoscale
Yi-Lin LiuHui Ying Yang

Abstract

Rational materials design for the synthesis of desirable hollow micro- and nanostructures has recently revealed the remarkable potential for high-performance energy storage and conversion devices. Owing to their unique "core-void-shell" structural configurations, yolk-shell-structured electrode materials can achieve intimate contact with the electrolyte and alleviate the volume expansion issue during electrochemical cycling, which is therefore poised to further boost the electrochemical properties of hybrid supercapacitors. Herein, a facile self-templated strategy, consisting of a hydrothermal step and a high-temperature sulfurization process, has been developed for the construction of yolk-shell (NiCo)9S8 spheres in situ coated by graphite carbon ((NiCo)9S8/GC) due to the non-equilibrium thermal treatment of alkali metal alkoxides. The as-synthesized yolk-shelled sphere exhibits a high specific capacitance of 1434.4 F g-1 (179.3 mA h g-1) at a current density of 1 A g-1, and good rate capability and cycling stability with 83.1% capacitance retention at 8 A g-1 over 5000 cycles. To further demonstrate its practical application, a hybrid supercapacitor device was assembled using (NiCo)9S8/GC as the battery-type positive electrod...Continue Reading

References

Aug 17, 2010·Nature Nanotechnology·David PechPatrice Simon
Jul 23, 2011·Chemical Society Reviews·Guoping WangJiujun Zhang
Nov 19, 2011·Science·Bruce DunnJean-Marie Tarascon
Mar 15, 2014·Science·Patrice SimonBruce Dunn
Nov 26, 2016·Advanced Materials·Bu Yuan GuanXiong Wen David Lou
Mar 13, 2019·Angewandte Chemie·Xiaoyan LiJohn B Goodenough

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BETA
thermal treatment
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