Adel El-marghany, Muhammad Khalil, Abdul Wahab Haroon, Fawad Ahmad, Ome Parkash Kumar, Abdul Ghafoor Abid, Shahroz Saleem, Zobia Siddique
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The potential CuCo<sub>2</sub>O<sub>4</sub>@NiMnO<sub>3</sub> electrocatalyst demonstrated an overpotential of 134 mV, a lowered Tafel slope of 26.17 mVdec<sup>−1</sup>, and a high turnover frequency of 0.06 s<sup>−1</sup> at the current density of 10 mA cm<sup>−2</sup>. In addition, it shows that OER required a low operating potential of 1.48 V in 1 M KOH solution. Besides, CuCo<sub>2</sub>O<sub>4</sub>@NiMnO<sub>3</sub> heterostructure displays optimal free energy prerequisite for reactant adsorption, a substantial electroactive surface area of 33.1 cm<sup>−2</sup>. Furthermore, it provides exceptional stability for 100 h in regulated electrolysis experiments with no discernible decrease in OER activity. 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引用次数: 0
摘要
具有成本效益的析氧电催化剂是日益增长的能源需求和能源转换装置的重要替代品。采用一步溶剂热法在不锈钢带（SSS）载体上制备了CuCo2O4@NiMnO3异质结构，并对其进行了析氧反应（OER）研究。通过对金属氧化物电催化剂物理特性的研究，证实了水热法制备的金属氧化物电催化剂。Cu和Co与双金属NiMnO3的集成通过产生活性位点提高了电荷转移能力。当电流密度为10 mA cm−2时，CuCo2O4@NiMnO3电催化剂的过电位为134 mV， Tafel斜率为26.17 mVdec−1，转换频率为0.06 s−1。此外，它还表明OER在1m KOH溶液中需要1.48 V的低工作电位。此外，CuCo2O4@NiMnO3异质结构具有吸附反应物所需的最佳自由能，电活性表面积高达33.1 cm−2。此外，它在调节的电解实验中提供了100小时的卓越稳定性，没有明显的OER活性下降。本研究提供了一种简单的合成方法来制造高效、低成本、无粘结剂的电催化剂。图形抽象
Activating design of tunable CuCo2O4@NiMnO3 heterostructure towards superior oxygen evolution reaction
The cost-effective electrocatalyst for oxygen evolution is an essential substitute for the growing energy needs as well as to energy conversion devices. The CuCo2O4@NiMnO3 heterostructure is prepared by a one-step solvothermal method on stainless steel strip (SSS) support and was subsequently investigated for oxygen evolution reaction (OER). The hydrothermally developed metallic oxide electrocatalysts were confirmed by using several techniques to investigate physical features. The integration of Cu and Co with bimetallic NiMnO3 has improved charge transfer capabilities by giving rise to active sites. The potential CuCo2O4@NiMnO3 electrocatalyst demonstrated an overpotential of 134 mV, a lowered Tafel slope of 26.17 mVdec−1, and a high turnover frequency of 0.06 s−1 at the current density of 10 mA cm−2. In addition, it shows that OER required a low operating potential of 1.48 V in 1 M KOH solution. Besides, CuCo2O4@NiMnO3 heterostructure displays optimal free energy prerequisite for reactant adsorption, a substantial electroactive surface area of 33.1 cm−2. Furthermore, it provides exceptional stability for 100 h in regulated electrolysis experiments with no discernible decrease in OER activity. This study offers a simple synthetic method for creating effective, low-cost, and binder-free electrocatalysts.
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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