Layer-by-layer WS2-Cr heterojunction as a positive working electrode material for high-performance supercapattery applications

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry Pub Date : 2024-10-24 DOI:10.1016/j.jelechem.2024.118738

Muhammad Zahir Iqbal , Atika Bibi , Asma Khizar , Nacer Badi , H.H. Hegazy , A.A. Alahmari

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Abstract

This study investigates the impact on the electrochemical performance of pristine sputtered WS₂ through the strategic integration of a highly conductive chromium interfacial layer. This study involves the fabrication of two different samples via magnetron sputtering: type I, WS₂-sputtered and type II, WS₂/Cr (sputtering of Cr as an interfacial layer between sputtered-WS₂ and NF). Afterward, structural, topographic and elemental composition of as-synthesized samples were inspected via XRD, SEM, Raman, and EDX. Following this, the energy storage performance were evaluated by employing CV, GCD, and EIS in three and two electrode assembly sequentially. In three electrode testing WS₂ and WS₂/Cr exhibited the specific capacity (Q_s) of 661.79 C g⁻¹ and 1600 C g⁻¹ at 3 mV s^-1 along with the capacity retention of 61.37 % (WS₂) and 83.04 % (WS₂/Cr), respectively. Similarly, through GCD WS₂ shows the Q_s of 637.34 C g⁻¹ at 0.8 A/g conversely, WS₂/Cr exhibited the Q_s of 1220 C g⁻¹ at 1.3 A g^-1. Besides, the WS₂/Cr demonstrated long-term longevity (capacity retention of 83.13 %) after 5000 GCD cycles. Based on exclusive electrochemical performance of type II of two samples, an asymmetric battery-type hybrid supercapacitor (WS₂/Cr//AC) was fabricated by incorporating WS₂/Cr and activated carbon (AC) as working and counter electrodes. WS₂/Cr//AC revealed the Q_s of 352 C g⁻¹ (785 F g^-1) at 0.7 A/g. Besides, it deliberately delivered 81 Wh kg⁻¹ and 1750 W kg⁻¹ energy and power. The device exhibits excellent cyclic stability by maintaining its capacity after 5000 GCD cycles and illustrated 87.30 % capacity retention. Following that, semi-empirical approach was applied to quantify the capacitive and diffusive currents’ contribution in overall device’s performance. The results highlight that WS₂/Cr hold colossal potential to fill the proficiency gap between presently keep-going devices and stern demands of future energy storage applications.

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逐层 WS2-Cr 异质结作为高性能超级电池应用的正工作电极材料

本研究探讨了通过战略性地整合高导电铬界面层对原始溅射 WS2 电化学性能的影响。本研究涉及通过磁控溅射制造两种不同的样品：I 型 WS2 溅射样品和 II 型 WS2/Cr 样品（在溅射 WS2 和 NF 之间溅射铬作为界面层）。随后，通过 XRD、SEM、拉曼和 EDX 检查了合成样品的结构、形貌和元素组成。随后，在三电极和两电极组装中依次使用 CV、GCD 和 EIS 评估了储能性能。在三电极测试中，WS2 和 WS2/Cr 在 3 mV s-1 时的比容量（Qs）分别为 661.79 C g-1 和 1600 C g-1，容量保持率分别为 61.37 %（WS2）和 83.04 %（WS2/Cr）。同样，通过 GCD，WS2 在 0.8 A/g 时的 Qs 为 637.34 C g-1，反之，WS2/Cr 在 1.3 A g-1 时的 Qs 为 1220 C g-1。此外，经过 5000 次 GCD 循环后，WS2/Cr 显示出长期的使用寿命（容量保持率为 83.13%）。基于两种样品 II 型的独特电化学性能，通过将 WS2/Cr 和活性炭（AC）分别作为工作电极和对电极，制备出了非对称电池型混合超级电容器（WS2/Cr//AC）。在 0.7 A/g 时，WS2/Cr//AC 的 Qs 为 352 C g-1 （785 F g-1）。此外，它还特意提供了 81 Wh kg-1 和 1750 W kg-1 的能量和功率。该装置具有出色的循环稳定性，在 5000 次 GCD 循环后仍能保持容量，容量保持率高达 87.30%。随后，应用半经验方法量化了电容电流和扩散电流对器件整体性能的贡献。研究结果表明，WS2/Cr 具有巨大的潜力，可以填补目前正在使用的器件与未来储能应用的迫切需求之间的能力差距。

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来源期刊

Journal of Electroanalytical Chemistry 化学-电化学

CiteScore

7.80

自引率

6.70%

发文量

912

审稿时长

2.4 months

期刊介绍： The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.