Abstract
In this work, the Perovskite powders LaFe0.5Cr0.5O3 with a space group of P m - 3 m was obtained by the sol-gel method. The nanoscale powders of LaFe0.5Cr0.5O3 have been tested as a cathode material for electrochemical supercapacitors. The CVA and charge-discharge curves were obtained at 0.5 mV/s to 16 mV/s and 0.5 mA/s to 16 mA/s scan rates accordingly. It is established that the cathode material LaFe0.5Cr0.5O3 demonstrates the specific capacity up to 16 F/g at a discharge scan rate 0.5 mV/s. Additionally, the maximum of the specific capacity was calculated and it is determined that C is 29.26 F/g, and the specific capacity of double electric layer CDEL is 3.44 F/g. It was determined that the contribution of the redox reactions in specific capacity is 88 %. The Nyquist plots and Mott-Schottky plots for LaFe0.5Cr0.5O3 were obtained. They consist of two parts that correspond to a different type of conductivity. Thus, it is established that LaFe0.5Cr0.5O3 shows different types of conductivity depending on the applied potential. The received values of flat band potential are -1.00 V and 0.16 V for n-type and p-type of conductivity accordingly.
Highlights
Due to the rapid development of electronics the number of personal gadgets such as mobile phones, smart watches, fitness bracelets, wireless headphones, mini cameras, smart glasses, etc. is increasing. Every year they become more complex and more functional, which leads to higher energy consumption. Against this background there is a need for development new energy storage devices with better capacity, less weight, cheaper, more reliable and environmentally friendly
The powders of complex oxide LaFe0.5Cr0.5O3 with perovskite structure were obtained by sol-gel method with auto-burning
The powder with perovskite structure LaFe0.5Cr0.5O3, obtained by sol-gel method, is nano-sized, which is confirmed by X-rays analysis and transmission electron microscope images
Summary
Due to the rapid development of electronics the number of personal gadgets such as mobile phones, smart watches, fitness bracelets, wireless headphones, mini cameras, smart glasses, etc. is increasing. Every year they become more complex and more functional, which leads to higher energy consumption. Against this background there is a need for development new energy storage devices with better capacity, less weight, cheaper, more reliable and environmentally friendly. One of the alternative types of energy storage, which suits the conditions above, is supercapacitor [1, 2]. The advantages of supercapacitor’s compare to classic batteries are low toxicity, high efficiency (more than 95 %), less weight, etc. All this makes supercapacitors very promising in the future. Researching new materials for supercapacitors with predefined properties is relevant today
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