Synthesis and characterization of reduced graphene oxide nanoparticles via hydrothermal method for energy storage and photocatalysis

IF 2.6 4区化学 Q3 CHEMISTRY, PHYSICAL Ionics Pub Date : 2025-01-28 DOI:10.1007/s11581-024-06050-x

V. Menaka, D. Geetha

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Abstract

Reduced graphene oxide (rGO) was synthesized via a simple and eco-friendly hydrothermal method using high-purity precursors. The novelty of this study lies in the comprehensive characterization and application of rGO for dual-functional performance: energy storage and water purification. The formation of rGO was confirmed through XRD, FTIR, and FT-Raman analysis, revealing an average crystallite size of 10 nm, calculated using the Scherrer formula. Advanced XPS analysis verified the oxidation state and chemical composition of rGO. The microstructure, elemental composition, and optical properties were thoroughly examined using FE-SEM with EDX, HR-TEM, UV–Vis-DRS, and PL spectroscopy. Electrochemical studies demonstrated rGO’s pseudocapacitive nature, achieving a high specific capacitance of 398 Fg⁻¹ (10 mVs⁻¹) with excellent cyclic stability, retaining 83% of its initial capacity after 2000 cycles. Notably, rGO exhibited remarkable photocatalytic activity for degrading Congo red (CR) and crystal violet (CV) dyes under UV-light irradiation, achieving high degradation efficiencies. This dual-functional performance underscores the potential of GO and rGO in sustainable energy storage applications, efficient water treatment, and critical environmental challenges.

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水热法还原氧化石墨烯纳米颗粒的合成及表征

还原氧化石墨烯（rGO）是利用高纯度前驱体，通过简单、环保的水热法合成的。本研究的新颖之处在于对 rGO 进行了综合表征，并将其应用于能量存储和水净化的双重功能。通过 XRD、傅立叶变换红外光谱和傅立叶变换拉曼光谱分析，证实了 rGO 的形成，根据舍勒公式计算得出的平均结晶尺寸为 10 纳米。先进的 XPS 分析验证了 rGO 的氧化态和化学成分。利用带有 EDX、HR-TEM、UV-Vis-DRS 和 PL 光谱的 FE-SEM，对其微观结构、元素组成和光学特性进行了深入研究。电化学研究证明了 rGO 的伪电容特性，其比电容高达 398 Fg-1（10 mVs-1），并具有极佳的循环稳定性，在循环 2000 次后仍能保持 83% 的初始容量。值得注意的是，在紫外光照射下，rGO 在降解刚果红（CR）和水晶紫（CV）染料方面表现出显著的光催化活性，实现了很高的降解效率。这种双功能性能凸显了 GO 和 rGO 在可持续能源储存应用、高效水处理以及应对严峻环境挑战方面的潜力。

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来源期刊

Ionics 化学-电化学

CiteScore

5.30

自引率

7.10%

发文量

427

审稿时长

2.2 months

期刊介绍： Ionics is publishing original results in the fields of science and technology of ionic motion. This includes theoretical, experimental and practical work on electrolytes, electrode, ionic/electronic interfaces, ionic transport aspects of corrosion, galvanic cells, e.g. for thermodynamic and kinetic studies, batteries, fuel cells, sensors and electrochromics. Fast solid ionic conductors are presently providing new opportunities in view of several advantages, in addition to conventional liquid electrolytes.