Arooj Fatima, B. M. Alotaibi, Albandari W. Alrowaily, Haifa A. Alyousef, A. Dahshan, A. M. A. Henaish
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Abstract
Globally, there are significant concerns about the steadily rising energy demand and depletion of conservative fuels. Water electrolysis provides hydrogen and oxygen, which can be used as a fuel with a highest energy conversion efficiency and gravimetric energy density. In future, hydrogen fuel will take the place of conventional fossil fuels, which are polluting the environment. For a greater range of energy generation devices, the highly appropriate, affordable electrocatalyst for OER is significant. In present work, a NbSe2/rGO nanocomposite was fabricated via hydrothermal process for OER electrochemical studies under 1.0 M KOH. The fabricated materials were verified by Raman spectroscopy, scanning electron microscopy (SEM), X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray. Because of its distinct shape, nanocomposite has more surface area, which results in more active pores with lots of potential for transfer of charge and prolonged material stability. The surface area of NbSe2/rGO nanocomposite determined through BET was 51 m2/g, i.e., higher than that of NbSe2, thus providing greater number of active sites for OER performance. The electrocatalytic performance results represented that pure NbSe2 nanosheets revealed a higher Tafel slope (51 mV/dec), conversely, NbSe2/rGO nanocomposite represented lower Tafel slope (36 mV/dec) respectively and efficient durability for 60 h with minor alternation in current density for long time period. As a consequence, the created nanocomposite proves to be an effective electrocatalyst for OER and energy conversion applications.
在全球范围内，人们对能源需求的持续上升和保守燃料的枯竭深感忧虑。水电解产生的氢气和氧气可用作燃料，具有最高的能量转换效率和重力能量密度。未来，氢燃料将取代污染环境的传统化石燃料。为了实现更广泛的能源发电装置，高度合适、价格合理的 OER 电催化剂意义重大。本研究通过水热法制备了 NbSe2/rGO 纳米复合材料，用于 1.0 M KOH 条件下的 OER 电化学研究。拉曼光谱、扫描电子显微镜（SEM）、X 射线粉末衍射（XRD）、扫描电子显微镜（SEM）和能量色散 X 射线对制备的材料进行了验证。由于形状独特，纳米复合材料具有更大的表面积，从而产生更多的活性孔隙，具有很大的电荷转移潜力，并能延长材料的稳定性。通过 BET 测定，NbSe2/rGO 纳米复合材料的比表面积为 51 m2/g，高于 NbSe2，从而为 OER 性能提供了更多的活性位点。电催化性能结果表明，纯 NbSe2 纳米片具有较高的塔菲尔斜率（51 mV/dec），相反，NbSe2/rGO 纳米复合材料的塔菲尔斜率较低（36 mV/dec），并且在较长时间内电流密度交替较小，能有效地持续 60 小时。因此，这种纳米复合材料被证明是一种有效的电催化剂，可用于 OER 和能量转换应用。
期刊介绍：
The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.
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