MXene/NiCo2S4 2D/3D Heterostructure as a High-Performance Pt-Free Counter Electrode for DSSCs

IF 6.8 3区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Science: Advanced Materials and Devices Pub Date : 2025-08-09 DOI:10.1016/j.jsamd.2025.100970

Kumar Subalakshmi , Anshika Gupta , Youngmin Lee , Sejoon Lee

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引用次数: 0

Abstract

This study represents a novel 2D/3D heterostructure of MXene/NiCo₂S₄ composites, which were used for the first time as a high-performance counter-electrode material for Pt-free dye-sensitized solar cells (DSSCs). The unique morphology of 2D-MXene/3D-NiCo₂S₄ proved advantageous in producing good electrode/electrolyte interfacial contact, enhancing the electrocatalytic activity via vigorous electron transfer and ion diffusion. Cyclic voltammetry, Tafel polarization, and electrochemical impedance spectroscopy measurements confirmed that hierarchical interconnection and aggregation of 2D-MXene sheets/3D-NiCo₂S₄ nanoparticles lead to both fast charge transport and rapid redox reaction kinetics. Consequently, the DSSC device assembled with the 2D-MXene/3D-NiCo₂S₄ counter electrode exhibited a higher photovoltaic conversion efficiency of up to 8.76 % compared to that of the standard Pt counter electrode-assembled device (8.46 %). These findings offer a perspective design concept for materializing the Pt-free, high-performance 2D/3D hierarchical heterostructure as a superb counter electrode of next-generation photovoltaic devices.

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MXene/NiCo2S4二维/三维异质结构作为DSSCs的高性能无pt对电极

该研究代表了一种新的2D/3D异质结构的MXene/NiCo2S4复合材料，首次被用作无pt染料敏化太阳能电池（DSSCs）的高性能反电极材料。2D-MXene/3D-NiCo2S4的独特形貌有利于产生良好的电极/电解质界面接触，通过强烈的电子转移和离子扩散提高电催化活性。循环伏安法、Tafel极化和电化学阻抗谱测量证实，2D-MXene薄片/3D-NiCo2S4纳米颗粒的分层互连和聚集导致了快速电荷传输和快速氧化还原反应动力学。因此，用2D-MXene/3D-NiCo2S4对电极组装的DSSC器件的光伏转换效率高达8.76%，而标准Pt对电极组装的器件的光伏转换效率为8.46%。这些发现为实现无pt、高性能2D/3D分层异质结构作为下一代光伏器件的极好对电极提供了一个全新的设计概念。

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来源期刊

Journal of Science: Advanced Materials and Devices Materials Science-Electronic, Optical and Magnetic Materials

CiteScore

11.90

自引率

2.50%

发文量

审稿时长

47 days

期刊介绍： In 1985, the Journal of Science was founded as a platform for publishing national and international research papers across various disciplines, including natural sciences, technology, social sciences, and humanities. Over the years, the journal has experienced remarkable growth in terms of quality, size, and scope. Today, it encompasses a diverse range of publications dedicated to academic research. Considering the rapid expansion of materials science, we are pleased to introduce the Journal of Science: Advanced Materials and Devices. This new addition to our journal series offers researchers an exciting opportunity to publish their work on all aspects of materials science and technology within the esteemed Journal of Science. With this development, we aim to revolutionize the way research in materials science is expressed and organized, further strengthening our commitment to promoting outstanding research across various scientific and technological fields.