Investigating the impact of reaction time on hydrothermal synthesis of Co(OH)2 electrodes and their symmetric device performance

IF 4.3 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of Physics and Chemistry of Solids Pub Date : 2025-06-04 DOI:10.1016/j.jpcs.2025.112893

Vijay L. Shinde , Minaj M. Faras , Pavan K. Pagare , Appasaheb P. Torane

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Abstract

This study investigates the hydrothermal synthesis of Co(OH)₂ nanosheets directly grown on a flexible stainless-steel film for supercapacitor applications. A systematic investigation of the hydrothermal reaction time was conducted to optimize the growth and morphology of the Co(OH)₂ nanosheets. The resulting electrode material was characterized using XRD, FTIR, XPS, SEM and BET assessment. XRD analysis confirmed the formation of a single-phase hexagonal crystal structure for Co(OH)₂. The optimized sample exhibited a specific surface area of approximately 5.0 m²/g. The Co(OH)₂ nanosheet electrode demonstrated a specific capacitance of 312 F/g at a current density of 0.7 mA/cm². At 100 mV/s, the electrode maintained 74.63 % of its initial performance after 2000 cycles. A solid-state symmetric energy storage device, (CH12//CH12), provided a maximum capacitance of 38 F/g at 0.7 mA/cm², and the calculated energy density is 7.38 Wh/kg. To demonstrate practicality, a red light-emitting diode (LED) was powered, which maintained 79.4 % of its initial illumination time. The Co(OH)₂ nanosheets on flexible substrates show great potential as high-capacitance electrode materials for energy storage.

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研究了反应时间对水热合成Co(OH)2电极及其对称器件性能的影响

本研究研究了直接生长在柔性不锈钢薄膜上的Co(OH)2纳米片的水热合成方法，用于超级电容器的应用。对水热反应时间进行了系统的研究，以优化Co(OH)2纳米片的生长和形貌。采用XRD、FTIR、XPS、SEM和BET等手段对电极材料进行了表征。XRD分析证实了Co(OH)2形成了单相六方晶体结构。优化后的样品比表面积约为5.0 m2/g。在电流密度为0.7 mA/cm2时，Co(OH)2纳米片电极的比电容为312 F/g。在100 mV/s下，经过2000次循环后，电极保持了74.63%的初始性能。一种固态对称储能器件（CH12//CH12）在0.7 mA/cm2下的最大电容为38 F/g，计算出的能量密度为7.38 Wh/kg。为了证明其实用性，我们为一个红色发光二极管（LED）供电，使其保持了79.4%的初始照明时间。在柔性衬底上制备的Co(OH)2纳米片具有作为高电容储能电极材料的巨大潜力。

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来源期刊

Journal of Physics and Chemistry of Solids 工程技术-化学综合

CiteScore

7.80

自引率

2.50%

发文量

605

审稿时长

40 days

期刊介绍： The Journal of Physics and Chemistry of Solids is a well-established international medium for publication of archival research in condensed matter and materials sciences. Areas of interest broadly include experimental and theoretical research on electronic, magnetic, spectroscopic and structural properties as well as the statistical mechanics and thermodynamics of materials. The focus is on gaining physical and chemical insight into the properties and potential applications of condensed matter systems. Within the broad scope of the journal, beyond regular contributions, the editors have identified submissions in the following areas of physics and chemistry of solids to be of special current interest to the journal: Low-dimensional systems Exotic states of quantum electron matter including topological phases Energy conversion and storage Interfaces, nanoparticles and catalysts.