4.7 Article

High performance asymmetric supercapacitor device based on lanthanum doped nickel-tin oxide/reduced graphene oxide composite

期刊

JOURNAL OF ENERGY STORAGE
卷 55, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.est.2022.105526

关键词

Nickel-tin oxide; La doping; Oxygen vacancy; Potential window; Asymmetric supercapacitor

资金

  1. Council of Scientific & Industrial Research (CSIR), India through CSIR-NET JRF [17/06/2018(i) EU-V]
  2. Science & Engineering Research Board (SERB), India [EEQ/2020/000481]
  3. Basic Science Research Program through the National Research Foundation (NRF) of Korea - Ministry of Education [NRF2019R1I1A3A02059471]

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Doping with rare-earth elements, a one-step hydrothermal method was used to prepare La-doped Ni-Sn oxide/reduced graphene oxide composite. The electrochemical performance of the composite was studied under different electrolyte conditions, and the LNSRG 2 composite showed good specific capacitance in 6M KOH electrolyte. An ASC device fabricated with LNSRG 2 and SRGO as positive and negative electrode materials, respectively, exhibited high energy density and good cyclic stability in 1M Na2SO4 electrolyte.
Doping is the most promising approach to improve the electrochemical performance of metal oxide-based supercapacitor. Rare-earth element doping is helpful to improve the electrochemical performance of metal oxides due to the presence of unique 4f electronic configuration. Herein, Lanthanum (La) doped Nickel-tin oxide/reduced graphene oxide (LNSRG) composite was successfully prepared via one-step hydrothermal method. The optimized LNSRG 2 composite exhibited similar to 1238 F g(-1) specific capacitance at 3 A g(-1) current density using 6 M KOH as electrolyte. The effect of electrolyte's pH on the electrochemical performances was investigated using various electrolytes. The asymmetric supercapacitor (ASC) device fabricated with LNSRG 2 as positive electrode material and sonochemically reduced graphene oxide (SRGO) as negative electrode material exhibited energy density of similar to 38 W h kg(-1) at a power density of similar to 870 W kg(-1) in the potential window of similar to 1.6 V using 1 M Na2SO4 as electrolyte. The ASC device retained similar to 75 % of its initial capacitance after 10,000 continuous charge-discharge cycles at 15 A g(-1) current density. Two ASC devices connected in series was capable of powering a 1.8 V red LED light.

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