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<p>This report elucidates fundamental insights into the optical and electrochemical performance of <span>l</span>-alanine-functionalized stable cadmium sulfide (CdS) quantum dots (QDs). Al-CdS QDs were efficiently synthesized via a simple, one-step wet chemical route. Powder XRD measurements revealed the cubic phase with a well-reduced crystallite size, high crystallinity, and phase purity of the synthesized material. SEM analyses showed nearly monodispersed spherical particles with a moderate porous architecture. FTIR spectra confirmed the efficient attachment of <span>l</span>-alanine onto the CdS surface. UV–Visible absorption spectra revealed the quantum size effect by a blue shift. The optical band gap of 3.64&#xa0;eV was revealed from Tauc’s plot. PL spectra implied the presence of surface defects facilitating enhanced electrochemical activity. Pseudocapacitive activity was examined through analyses on CV and EIS measurements which were taken on a three-electrode system. The analyses revealed a hybrid charge storage behavior. The Al-CdS electrode exhibits a specific capacitance of 692 mF/g at 10&#xa0;mV/s in 0.5&#xa0;M Na<sub>2</sub>SO<sub>4</sub> aqueous electrolyte. The observed hybrid charge storage behavior and surface-dominated pseudocapacitance highlight the potential of Al-CdS QDs as a model system for fundamental electrochemical studies and future composite electrode design.</p>

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Electrochemical insights of l-alanine-functionalized CdS quantum dots for supercapacitor applications

  • 期刊论文

  • 发表日期：

    2026年3月7日

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  • B. Dhanalakshmi,
  • B. Padmadevi,
  • G. Suresh

摘要

This report elucidates fundamental insights into the optical and electrochemical performance of l-alanine-functionalized stable cadmium sulfide (CdS) quantum dots (QDs). Al-CdS QDs were efficiently synthesized via a simple, one-step wet chemical route. Powder XRD measurements revealed the cubic phase with a well-reduced crystallite size, high crystallinity, and phase purity of the synthesized material. SEM analyses showed nearly monodispersed spherical particles with a moderate porous architecture. FTIR spectra confirmed the efficient attachment of l-alanine onto the CdS surface. UV–Visible absorption spectra revealed the quantum size effect by a blue shift. The optical band gap of 3.64 eV was revealed from Tauc’s plot. PL spectra implied the presence of surface defects facilitating enhanced electrochemical activity. Pseudocapacitive activity was examined through analyses on CV and EIS measurements which were taken on a three-electrode system. The analyses revealed a hybrid charge storage behavior. The Al-CdS electrode exhibits a specific capacitance of 692 mF/g at 10 mV/s in 0.5 M Na2SO4 aqueous electrolyte. The observed hybrid charge storage behavior and surface-dominated pseudocapacitance highlight the potential of Al-CdS QDs as a model system for fundamental electrochemical studies and future composite electrode design.