Cyanido-Bridged Bimetallic/rGO Electrodes for Dye-Sensitized Solar Cells and Battery-Type Supercapacitors
Akshaya Subhramaniyan Rasappan, Palanisamy Rajkumar, S. Asaithambi, Venkatachalam Thangamuthu, N. Muthukumarasamy, Dhayalan Velauthapillai, Jayachithra Jaganathan, Jin Ho Kim
Abstract
The development of physiochemically stable multifunctional electrodes for energy conversion and storage is groundbreaking in the field of research for integrated devices. On that note, WS 2 /rGO/NiFe nanocages were designed by employing the Kirkendall effect, which were used as a counter electrode in dye-sensitized solar cells (DSSCs) and asymmetric supercapacitors (ASCs). The WS 2 /rGO/NiFe nanocages exhibited a power conversion efficiency of 6.5% in the DSSC device. In the supercapacitor, the advantage of nanocage formation makes the electrolyte easily access the inner area of the electrode, resulting in an outstanding specific capacitance of 779.6 F/g at 1 A/g current density. The WS 2 /rGO/NiFe nanocages//AC device owing to multiple oxidation states of nickel and tungsten attains an energy density of 67.2 Wh/kg and power density of 1209 W/kg with a Coulombic efficiency and retention capacitance of 99.01 and 82.3% at 6 A/g current density after 6000 cycles. Thus, the findings unequivocally establish vast possibilities present in the implementation of WS 2 /rGO/NiFe nanocages as all-in-one electrodes, bestowing upon exquisite innovative electronic devices of supreme sophistication.