|
Abstract
|
This study offers a cost-effective and high-yield electrochemical route for synthesizing molybdenum nanocomposites for energy storage and conversion. MoS2@α-MoO3 heterostructure nanomaterials are synthesized using an affordable electrosynthesis method on graphite substrate, followed by a simple annealing process at different temperatures. Then, graphite/ MoS2-amorphous electrodes are annealed at 30 °C, 40 °C, and 50 °C. Following physicochemical characterizations, statistical and morphological analyses, including monofractal and multifractal formalisms are conducted. Findings indicate increasing annealing temperature enhances surface roughness and irregularity with well-developed surface morphology. In a redox-additive electrolyte (1.0M Na2SO4 þ 1.0M NaI), G/MoS2@α-MoO3-500|| G/rGO Na-ion asymmetric supercapattery and G/MoS2@α-MoO3- 500||G/MoS2@α-MoO3-500 Na-ion symmetric supercapattery are fabricated. The G/MoS2@α-MoO3-500||G/rGO supplies a specific capacity of 191.79 mAh g1, 45.01 Wh kg1 energy density, and 234.72Wkg1 power density at 1 A g1 with 95.4% retention after 10 000 cycles with a broad potential window of 1.30 V. The G/ MoS2@α-MoO3-500||G/MoS2@α-MoO3-500 demonstrates CS of 207.13 mAh g1, Es of 48.62 Wh kg1, and Ps of 234.72Wkg1 at 1 A g1 with 96.4% retention after 10 000 cycles. Tailoring developed morphologies at G/MoS2@α-MoO3-500 electrode yields catalytically active sites for excellent electrocatalytic activities toward hydrogen evolution reaction (ηj = 10 = 44 mV and Tafel slope of 81 mV dec1) in acidic solution.
|