Synergistic integration of 3D-ZnTb2O4@1D-CNT@2D-rGO: A multi-dimensional hybrid electrode on carbon paper for highly-efficient energy and HER catalysis applications

초록

The enormous demand for energy in the current era has sparked significant interest in asymmetric hybrid devices (AHDs) owing to the characteristics of the battery and supercapacitor. Here, a composite of zinc terbium oxide (ZnTb2O4), multi-walled carbon nanotubes (MWCNTs), and reduced graphene oxide (rGO), is synthesized utilizing a hydrothermal process. The material demonstrated its battery-grade nature and excellent performance with a specific capacity (Qs) of 1388.6C/g. A hybrid device (ZnTb2O4@rGO@CNT//AC) showed a maximum Qs of 201.7C/g because of the synergistic effect. The asymmetric hybrid energy storage device revealed a maximum power density (Pd) of 2695.7 W/kg and energy density (Ed) of 84.6 Wh/Kg with high capacity retention of 94 % after 10,000 charging and discharging cycles. The ZnTb2O4@rGO@CNT electrode is utilized in the hydrogen evolution reaction (HER) application. The hybrid electrode showed a better value of overpotential and Tafel slope of 49 mV and 51 mV/dec, respectively. This work introduces a new hybrid material to meet the need for more Ed and higher Pd in AHDs, and it can be used as an effective electrocatalyst.

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