Direct electrolysis of liquid anhydrous ammonia for continuous production of high-purity, pressurized hydrogen at ambient temperature†

EES catalysis Pub Date : 2025-05-15 DOI:10.1039/D5EY00140D

Seungmok Han, Junsoo Ha, Jae Seung Lee, Hyukjoo Lee, Chang Hyun Lee, Kangwoo Cho and Chang Won Yoon

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Abstract

The direct electrolysis of liquid anhydrous ammonia (NH₃(l), >99.99% of NH₃, free of water and solvent) is demonstrated using a 25 cm² zero-gap electrolyzer, consisting of a Ru/C anode and a Pt/C cathode, with the two electrodes spatially separated by a cation exchange membrane. This system, supplied by NH₃(l) and NH₄Br as the supporting electrolyte, continuously produces high-purity and pressurized hydrogen (H₂, >99.99%, >5.5 bar) at a temperature of 10 °C and a pressure of 6.2 bar, without requiring H₂/N₂ separation and compression processes. The direct NH₃(l) electrolyzer exhibits a cell potential of 1.1 V at 0.1 A cm⁻², presenting a faradaic efficiency of >99.3% for H₂ production. The developed system achieves a H₂ production rate of >18.8 mol-H₂ g_cat⁻¹ h⁻¹ at 0.5 A cm⁻², which is 4.7-fold higher than the highest H₂ production rate reported to date for NH₃(g) thermolysis at temperatures of over 500 °C.

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在常温下直接电解液态无水氨以连续生产高纯度加压氢气

用一个25 cm2的零间隙电解槽直接电解液态无水氨（NH3(l), 99.99% NH3，不含水和溶剂），该电解槽由Ru/C阳极和Pt/C阴极组成，两个电极由阳离子交换膜隔开。该系统以NH3(l)和NH4Br为支撑电解质，在温度为10℃，压力为6.2 bar的条件下，无需进行H2/N2分离和压缩过程，即可连续生产高纯加压氢气（H2, >99.99%, >5.5 bar）。直接NH3(l)电解槽在0.1 a cm−2下的电势为1.1 V， H2生成的法拉第效率为99.3%。该系统在0.5 a cm−2条件下的H2产率为18.8 mol-H2 gcat−1 h−1，比迄今为止报道的在500℃以上温度下NH3(g)热解的最高H2产率高4.7倍。

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EES catalysis

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