Ammonia is one of the most abundantly used chemicals in the world, and it is a potential hydrogen carrier for possible solutions of hydrogen storage and transportation. The conventional method of ammonia production is energy-intensive that requires high pressure and it is dominantly dependent on fossil fuels for hydrogen and nitrogen production. With the electrochemical synthesis option, ammonia can be produced at atmospheric pressures and lower temperature levels. Hydrogen production via water electrolysis using renewable energy can further reduce carbon emissions. In this work, ammonia production via an electrochemical process in a molten salt medium is modelled through electrochemical impedance spectroscopy using several equivalent circuit models. Then, afterwards, for a case study in Qatar to produce renewable ammonia, wind data are used to predict the annual ammonia production rates where the wind turbine rated power is 6 MW. The electrochemical modelling results show that two main parameters emerged as the most influential on the modelling of the low frequencies region; the capacitance of the electrolyte, and the capacitance of the electrode. Furthermore, it is found that the Warburg diffusion limit showed little to negligible effect on the shape in the low-frequency region. The best performing model in terms of the goodness of fit is model 11 with a value of 4.75 × 10, which was modelled by 9 circuit elements (resistors, inductor, capacitors and Gerischer elements) and 12 adjustable parameters. Moreover, Models 11 and 12 reached a goodness of fit in the order of 10. Some models included a larger number of variables but offered poorer fit or insignificant improvement, which does not provide justification for the additional elements.

中文翻译：

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利用风力发电生产可再生燃料的熔盐介质中氨合成的电化学建模


氨是世界上使用最广泛的化学品之一，它是一种潜在的氢载体，可用于氢存储和运输的可能解决方案。传统的氨生产方法是能源密集型的，需要高压，并且主要依赖化石燃料来生产氢气和氮气。通过电化学合成选项，可以在大气压和较低温度下生产氨。利用可再生能源电解水制氢可以进一步减少碳排放。在这项工作中，使用几个等效电路模型通过电化学阻抗谱对熔盐介质中通过电化学过程生产氨进行建模。然后，在卡塔尔生产可再生氨的案例研究中，使用风数据来预测风力涡轮机额定功率为 6 MW 时的年氨生产率。电化学建模结果表明，两个主要参数对低频区域的建模影响最大；电解质的电容和电极的电容。此外，还发现 Warburg 扩散极限对低频区域形状的影响几乎可以忽略不计。就拟合优度而言，表现最好的模型是模型 11，其值为 4.75 × 10，它由 9 个电路元件（电阻器、电感器、电容器和 Gerischer 元件）和 12 个可调参数建模。此外，模型 11 和 12 的拟合优度达到了 10 的量级。一些模型包含更多数量的变量，但拟合效果较差或改进不显着，这不能为附加元素提供理由。