Plasma synthesis of NH₃ from N₂ and renewable H₂ under mild conditions is very attractive for decentralised sustainable green ammonia production using intermittent renewables. In this study, NH₃ synthesis was performed under ambient conditions in a dielectric barrier discharge (DBD) plasma reactor. Different tangled wire internal electrodes were employed to understand the influence of electrode materials on plasma ammonia synthesis. Compared with a rod electrode, a tangled wire electrode substantially enhanced the NH₃ concentration and reduced the energy cost for ammonia production, which can be attributed to the expanded surface area and the chemisorption properties of the tangled electrodes. The influence of the N₂/H₂ molar ratio and total flow rate on the reaction performance was also evaluated. The lowest energy cost (59.0 MJ mol⁻¹) for ammonia production was achieved using a Cu tangled electrode at a total flow rate of 250 ml min⁻¹ and a discharge power of 20 W. The electrical diagnostics of the plasma process showed that the tangled wire electrodes decreased the breakdown voltage of the DBD and enhanced charge deposition, which enhanced the NH₃ production. The reaction mechanism was discussed for the process optimisation of ammonia synthesis in a tangled wire DBD system.

在温和条件下由 N ₂和可再生 H ₂等离子合成 NH ₃对于使用间歇性可再生能源的分散式可持续绿色氨生产非常有吸引力。在这项研究中，NH ₃合成是在介质阻挡放电 (DBD) 等离子体反应器中在环境条件下进行的。使用不同的缠结线内电极来了解电极材料对等离子体氨合成的影响。与棒状电极相比，缠结线状电极显着提高了 NH ₃浓缩并降低了氨生产的能源成本，这可归因于扩大的表面积和缠结电极的化学吸附特性。还评估了N ₂ /H ₂摩尔比和总流速对反应性能的影响。使用 Cu 缠结电极以 250 ml min ^-1的总流速和 20 W 的放电功率实现了氨生产的最低能源成本 (59.0 MJ mol ^-1 )。等离子体过程的电诊断表明缠结的电极丝降低了 DBD 的击穿电压并增强了电荷沉积，从而增强了 NH ₃生产。讨论了在缠丝DBD系统中氨合成工艺优化的反应机理。