MoS2纳米片作为析氧反应和电化学超级电容器的双功能电极,International Journal of Energy Research

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MoS2纳米片作为析氧反应和电化学超级电容器的双功能电极
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2022-08-02 , DOI: 10.1002/er.8447
Komal B. Pisal ₁ , Bapuso M. Babar ₁ , Sarfraj H. Mujawar ₁ , Sawanta S. Mali ₂ , Chang Kook Hong ₂ , Shrikrishna D. Sartale ₃ , Laxman D. Kadam ₄

Affiliation

近年来，用于析氧反应（OER）和超级电容器的经济型多功能材料的需求急剧增加。本研究的重点是使用一种简便且具有成本效益的水热技术合成介孔二硫化钼纳米片。已经详细研究了酸性、碱性和中性 pH 条件对 MoS ₂的结构、形态和电化学性质的影响。强烈的(0 0 2)衍射峰表明MoS ₂沿六方晶体结构的c轴生长。在酸性pH条件下制备的MoS _{2表现出较少的MoS}₂层堆积。pH 3 MoS ₂样品具有高比表面积，因此提供了丰富的电活性位点。电化学测量使用循环伏安法、恒电流充放电法、线性扫描伏安法和电化学阻抗谱法进行。结果表明，在酸性pH条件下制备的MoS _{2在5 mV/s的扫描速率下实现了857 F/g的高比电容。}此外，即使在 1000 次循环后，电极也表现出 78% 的循环稳定性。此外，在析氧反应中，MoS ₂电催化剂需要 299 mV 的过电位才能提供 25 mA/cm ²的电流。这些结果表明 MoS ₂纳米片可以作为 OER 和超级电容器电极的潜在候选者。

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MoS2 nanosheets as bifunctional electrode for oxygen evolution reaction and electrochemical supercapacitor

In recent years, the demand for economic multifunctional materials for oxygen evolution reaction (OER) and supercapacitors increased tremendously. The present study focuses on the synthesis of mesoporous molybdenum disulfide nanosheets using a facile and cost-effective hydrothermal technique. The influence of acidic, alkaline, and neutral pH conditions on structural, morphological, and electrochemical properties of MoS₂ has been studied in detail. The intense (0 0 2) diffraction peak evidence the growth of MoS₂ along the c axis of hexagonal crystal structure. The MoS₂ prepared in acidic pH condition exhibit less stacking of MoS₂ layers. The pH 3 MoS₂ sample possesses high specific surface area and hence affords abundant electroactive sites. The electrochemical measurements were carried out using cyclic voltammetry, galvanostatic charge-discharge, linear sweep voltammetry, and electrochemical impedance spectroscopy. The results show that the high specific capacitance of 857 F/g at 5 mV/s scan rate was achieved for the MoS₂ prepared under acidic pH conditions. Further, the electrode exhibits cyclic stability of 78% even after 1000 cycles. Also, in oxygen evolution reaction, MoS₂ electrocatalyst requires an overpotential of 299 mV to deliver a current of 25 mA/cm². These results suggest that MoS₂ nanosheets can serve as a potential candidate as an electrode for OER and supercapacitors.

更新日期：2022-08-02

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