Temperature dependent supercapacitive performance in La2O3 nano sheet decorated reduce graphene oxide. (10th January 2018)

• Record Type: Journal Article
• Authors: Miah, Milon; Bhattacharya, Shatabda; Dinda, Diptiman; Saha, Shyamal K.
• Is Part Of: Electrochimica acta. Volume 260(2018)
• Page Start: 449
• Page End: 458
• Publication Date: 2018-01-10
• Subjects: La2O3 -- Graphene -- Supercapacitor -- Temperature dependent capacitance; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2017.12.098
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: It is well known that high performance supercapacitor with high energy and power density is usually degrade at high temperatures. Therefore, to explore the thermal stability, temperature dependent study of supercapacitor is very useful. In the present work, La2 O3 nanosheet decorated reduce graphene oxide is synthesized to use it as electrode material in high performance supercapacitor. Temperature dependent electrochemical behavior viz. charging discharging and current voltage (I-V) characteristics are studied to explore the thermal stability of the system. In comparison to pristine rGO, the specific capacitance of La2 O3 decorated sample is found to increase by 158% at temperatures 30 °C and 205% at 70 °C respectively. The highest value obtained is 751 F/g at temperature 70 °C at a current density of 1 A/g. Remarkably the specific capacitance of hybrid electrode retains 78% of its original value at temperature 30 °C; conversely 67% of its original value even at higher temperature 70 °C after 2000 cycles. The enhancement of specific capacitance is explained by the charge transfer effect between rGO and La2 O3 at the interface. Highlights: G-La2 O3 and pristine rGO are prepare to compare temperature dependent charge storage capacity. Specific capacitance 751 F/g is obtained for G-La2 O3 at temperature 70 °C. This is explained by temperature induced internal field emission. Specific capacitance increase by 205% at 70 °C for G-La2 O3 .