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An Approach for CdS-QD-Based Layered Heterostructure Electrodes for Supercapacitor Applications

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Abstract

In the design of supercapacitor electrode materials, a large active surface area for energy storage, reduced ion diffusion pathway, low charge conduction resistance, and mechanical reliability in relation to energy density during charging and discharging are fundamental requirements. In this work, layered heterostructure materials were fabricated by a chemical route and achieved extraordinary results, obtaining supercapacitors with good electrochemical compatibility. The electron transfer in the layered structure significantly enhanced the electropotential and current photocurrent for the effective separation of electron–hole pairs. The as-prepared fluorine-doped tin oxide substrate/titanium dioxide/cadmium sulfide quantum dots/polyaniline (FTO/TiO2/CdS-QDs/PANI) demonstrates outstanding supercapacitive performance (1118.5 Fg−1 at 5 Ag−1) and exceptional rate efficiency (800.7 Fg−1 at 20 A g−1) with the incorporation of CdS-QDs and PANI layer. The fabricated supercapacitor device provides optimal energy density of 67.4 Wh kg−1 at power density of 1544.3 W kg−1. The significant results were associated with the TiO2 nanostructure, which can promote more rapid ion diffusion, and CdS-QDs that can produce high ion diffusion in the materials while improving the stability of the electrodes. Furthermore, the fabricated asymmetric supercapacitor exhibits good cyclic stability, with 70% capacitive retention after 5000 cycles. The present research work reveals an effective new way to assemble layered electrodes for supercapacitor applications.

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Data Availability

The data sets produced during or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgments

The authors would like to extend their sincere appreciation to the Researcher supporting program at King Saud University, Riyadh, for funding this work under the project number (RSPD2023R699).

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Authors and Affiliations

  1. Department of Physics and Astronomy, College of Science, King Saud University, P.O. BOX 2455, 11451, Riyadh, Saudi Arabia

    Syed Mansoor Ali

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  1. Syed Mansoor Ali
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SMA: Conceptualization, Writing—review & editing, Supervision, Formal analysis, Writing—original draft.

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Correspondence to Syed Mansoor Ali.

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Ali, S.M. An Approach for CdS-QD-Based Layered Heterostructure Electrodes for Supercapacitor Applications. J. Electron. Mater. 53, 207–216 (2024). https://doi.org/10.1007/s11664-023-10762-7

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