NiS/Ni 3 S 2 @NiWO 4 nanoarrays towards all-solid-state hybrid supercapacitor with record-high energy density
- PDF / 8,034,682 Bytes
- 9 Pages / 595.276 x 793.701 pts Page_size
- 52 Downloads / 210 Views
Published online 29 October 2020 | https://doi.org/10.1007/s40843-020-1494-4
NiS/Ni3S2@NiWO4 nanoarrays towards all-solid-state hybrid supercapacitor with record-high energy density 1†
2†
1†
1
1
1
1
Fangshuai Chen , Xiaoya Cui , Chang Liu , Baihua Cui , Shuming Dou , Jie Xu , Siliang Liu , 1 1* 1* 1,3 Hong Zhang , Yida Deng , Yanan Chen and Wenbin Hu ABSTRACT The rational design and synthesis of hybrid-type electrode nanomaterials are significant for their diverse applications, including their potential usage as high-efficiency nanoarchitectures for supercapacitors (SCs) as a class of promising energy-storage systems for powering next-generation electric vehicles and electronic devices. Here, we reported a facile and controllable synthesis of core-shell NiS/Ni3S2@ NiWO4 nanoarrays to fabricate a freestanding electrode for hybrid SCs. Impressively, the as-prepared freestanding NiS/ Ni3S2@NiWO4 electrode presents an ultrahigh areal capacity −2 −2 of 2032 μA h cm at 5 mA cm , and a capacity retention of 63.6% even when the current density increased up to −2 50 mA cm . Remarkably, the NiS/Ni3S2@NiWO4 nanoarraybased hybrid SC delivers a maximum energy density of −2 −2 1.283 mW h cm at 3.128 mW cm and a maximum power −2 −2 density of 41.105 mW cm at 0.753 mW h cm . Furthermore, the hybrid SC exhibits a capacity retention of 89.6% even after continuous 10,000 cycles, proving its superior stability. This study provides a facile pathway to rationally design a variety of core-shell metal nanostructures for high-performance energy storage devices. Keywords: core-shell nanoarrays, freestanding electrode, maximum energy density, hybrid SC
INTRODUCTION With the continuous reduction of traditional fossil energy reserves and the increasing global environmental problems, the development of new and environmental-benign energy storage devices is one of the most important
strategies to solve the energy crisis. Electrochemical energy storage devices have attracted extensive attention for the last few decades [1–3]. Among all the energy storage devices featured with small size, flexible and high-performance [4,5] supercapacitors (SCs) have become one of the hot topics due to their excellent properties, such as high power density, environmental friendliness, long durability, low cost and fast charge/discharge [6,7], as compared with Li-ion batteries. However, the current technology is far from the best choice to modify energy density, charge efficiency and cycle life of SCs at molecular scale, which hinders their further applications in electronics and industry. As the core of SCs, the electrochemical performance of electrode materials has a decisive impact on the energy storage performance of SCs [8,9]. Therefore, electrode materials with high energy density should be intensively investigated for potential SCs. The hybrid SC devices, using electric double-layer capacitive (EDLC) materials as the negative electrodes and the battery-type materials as the positive electrodes [10,11], possess enhanced characteristics, including hi
Data Loading...
