Coral-like structured nickel sulfide-cobalt sulfide binder-free electrode for supercapattery
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High-efficiency and lightweight electrodes are advantageous for acquiring high-energy density and flexible supercapattery. Herein, binder-free electrodes were fabricated by growing directly nickel sulfide (NiS) nanoflakes and coral-like nickel sulfide-copper sulfide (NiCuS) on nickel foam using hydrothermal method. Structural studies show that both electrodes are composed of multiphases crystalline structure. Morphological studies reveal that the incorporation of Cu ion has greatly influenced the morphology of NiS, i.e., from nanoflake arrays to coral-like structure (built by interconnected nanotubular). The electrochemical studies demonstrate that the presence of Cu in NiCuS significantly improved the specific capacity of NiS from 382 to 688 C/g at 10 A/g. Moreover, the rate capability of NiS is enhanced from 69 to 78% capacity retention. The origin of the enhancement in performance shown by NiCuS as compared with NiS is due to the enhancement in electroactive sites and reduced internal resistance contributed from the presence of different valence states. In order to access the real-time performance of NiCuS electrode, supercapattery was assembled. The device exhibits the energy density of 23 Wh/kg at 388 W/kg and degraded only 16% of its initial capacity after 5000 cycles.
KeywordsNickel sulfide Copper sulfide Binder-free electrode Supercapattery
This work is financially supported by Fundamental Research Grant Scheme (FRGS) from Ministry of Education, Malaysia (FP062-2018A). Authors would like to thank Collaborative Research in Engineering, Science and Technology Center (CREST) for their continuous support in this research (PV027-2018). A special thank you to ECLIMO SDN BHD too.
- 7.Ma H, He J, Xiong D, Wu J, Li Q, Dravid V, Zhao Y (2016) Nickel cobalt hydroxides@reduced graphene oxide hybrid nanolayers for high performance asymmetric supercapacitors with remarkable cycling stability nickel cobalt hydroxides@reduced graphene oxide hybrid nanolayers for high performance asymmetric Supercapacitor. ACS Appl Mater Interfaces 8:1992–2000. https://doi.org/10.1021/acsami.5b10280 CrossRefPubMedGoogle Scholar
- 8.Obreja V (2014) Supercapacitors Specialities - materials review Supercapacitors specialities - materials review. https://doi.org/10.1063/1.4878482
- 9.Zhou Y (2015) High performance ionic capacitive energy storage and harvesting devicesGoogle Scholar
- 14.Chen W, Xia C, Alshareef HN, Al CET (2014) One-step electrodeposited nickel cobalt sulfide nanosheet arrays for high-performance asymmetric supercapacitorsGoogle Scholar
- 26.Li R-Z, Peng R, Kihm KD, Bai S, Bridges D, Tmumuluri U et al (2016) High-rate in-plane microsupercapacitors scribed onto photo paper using in-situ femtolaser-reduced graphene oxide/au nanoparticle microelectrodes. Energy Environtal Sci 9:1458–1467. https://doi.org/10.1039/C5EE03637B CrossRefGoogle Scholar
- 27.Universiteit T, Doi E, Version D (2019) Lithium metal microreference electrodes and their applications to Li-ion batteries lithium metal microreference electrodes and their applications to Li-ion batteries Jiang ZhouGoogle Scholar