Fabrication and characterization of free-standing α-MnO2/AC composite electrodes for Na-Ion batteries

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Letters Pub Date : 2025-02-17 DOI:10.1016/j.matlet.2025.138253

Ali Ahmed Aldarmaki, Amarsingh Bhabu Kanagaraj, Daniel S. Choi

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Abstract

The rapid growth of the date palm industry in the United Arab Emirates (UAE) results in significant biomass waste, particularly from leaflets and fronds. This study presents a sustainable approach to repurposing date palm biomass by synthesizing activated carbon (AC) from waste date palm leaves and integrating it with alpha-phase manganese dioxide (α-MnO₂) to fabricate a composite anode material for sodium-ion batteries (NIBs). A flexible, free-standing α-MnO₂/AC composite electrode was fabricated after a two-step hydrothermal method. Scanning electron microscope (SEM) analysis reveals the formation of nanostructured α-MnO₂ embedded within the porous AC matrix. Electrochemical testing reveals that the composite anode exhibits a discharge capacity of 466 mAh/g at a current density of 50 mA/g, with remarkable cycling stability and a consistent coulombic efficiency of 100 %. This work demonstrates a sustainable use of biomass waste for energy storage applications, providing an eco-friendly solution for high-capacity, long-cycle NIBs.

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na离子电池用独立α-MnO2/AC复合电极的制备与表征

阿拉伯联合酋长国（UAE）的枣椰树工业的快速增长导致了大量的生物质浪费，特别是来自小叶和叶子的浪费。本研究提出了一种可持续利用枣椰树生物质的方法，即从废枣椰树叶中合成活性炭（AC），并将其与α相二氧化锰（α-MnO2）整合，制备钠离子电池（nib）复合负极材料。采用两步水热法制备了一种柔性、独立式α-MnO2/AC复合电极。扫描电镜（SEM）分析表明，纳米结构的α-MnO2包埋在多孔AC基体中。电化学测试表明，复合阳极在50 mA/g电流密度下的放电容量为466 mAh/g，具有显著的循环稳定性和100%的库仑效率。这项工作展示了生物质废物在储能应用中的可持续利用，为高容量、长周期nib提供了一种环保的解决方案。

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来源期刊

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive