This study investigates the effect of an applied stationary voltage on the vibrational properties of 1 M H₂SO₄ and H₂SO₄-based reduced-graphene oxide (rGO) nanofluids, commonly used as electrolytes in electrochemical cells. Our findings indicate that the energy of the symmetric stretching vibrations of H₂SO₄ remains unaffected by the electric field. However, a slight deviation toward lower energy and an enhancement of Raman intensity are observed in the asymmetric stretching vibration of H₂SO₄ due to the applied voltage. Furthermore, the addition of rGO to the base fluid produces a significant redshift in the symmetric stretching bands, indicating that the presence of rGO produces important changes at the macroscopic level in the base fluid. Synchronous and asynchronous maps further uncover the positive correlations between the D and G bands as well as between rGO and the base fluid bands. Specifically, the asynchronous map revealed complex dynamics between the rGO and H₂SO₄ bands and only positive correlations between H₂SO₄ bands. These results demonstrate the potential of Raman spectroscopy as a non-invasive technique to systematically study the influence of electric fields on the vibrational properties of fluids and nanofluids, which can ultimately lead to the development of significantly more efficient electrochemical cells.

_{本研究研究了施加的固定电压对 1 MH 2} SO ₄和 H ₂ SO ₄基还原氧化石墨烯 (rGO) 纳米流体振动特性的影响，这些流体通常用作电化学电池中的电解质。_{我们的研究结果表明，H 2} SO ₄对称伸缩振动的能量不受电场影响。然而，由于施加的电压，在H ₂ SO ₄的不对称伸缩振动中观察到向较低能量的轻微偏差和拉曼强度的增强。此外，向基液中添加rGO会在对称伸缩带中产生显着的红移，表明rGO的存在在基液中产生宏观水平的重要变化。同步和异步图谱进一步揭示了 D 和 G 带之间以及 rGO 和基础流体带之间的正相关性。具体来说，异步图揭示了rGO和H ₂ SO _{4带之间的复杂动态以及H 2} SO ₄带之间仅正相关。这些结果证明了拉曼光谱作为一种非侵入性技术的潜力，可以系统地研究电场对流体和纳米流体振动特性的影响，最终可以开发出效率更高的电化学电池。