Hydrogen production via aqueous ammonia electrolysis: electrolyte optimization, product selectivity, and efficiency analysis

IF 4.2 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications Pub Date : 2026-04-01 Epub Date: 2026-02-20 DOI:10.1016/j.elecom.2026.108124

Franciele Lamaison Fossaluza, Paulo Firmino Moreira, Claudio Augusto Oller do Nascimento, Maria Anita Mendes

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Abstract

This study presents a comprehensive investigation of aqueous ammonia electrolysis as an alternative method for hydrogen production. It explores various experimental conditions, energy, and Faradaic efficiencies, and the underlying electrochemical mechanisms. Cyclic voltammetry and electrolysis tests were conducted at different current densities (ranging from 50 to 700 mA) to determine the optimal conditions for hydrogen gas (H₂) generation. Gas chromatography with a thermal conductivity detector (GC-TCD) was used to confirm the production of hydrogen and verify the absence of gaseous nitrogen. Alongside the solution-phase analyses, these findings provide clear evidence for the formation of soluble by-products, primarily nitrite (NO₂⁻) and nitrate (NO₃⁻), as both species were detected and quantified in our measurements. The Faradaic efficiency reached 98%, while energy efficiency ranged from 59% to 75%. The results are compared with existing literature, emphasizing ammonia's potential as a sustainable hydrogen carrier and highlighting the current limitations of the process in aqueous media.

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通过水氨电解制氢：电解质优化，产品选择性和效率分析

这项研究提出了一个全面的调查，水氨电解作为一种替代的方法生产氢。它探讨了各种实验条件、能量和法拉第效率，以及潜在的电化学机制。在不同电流密度（50 ~ 700 mA）下进行循环伏安法和电解试验，以确定氢气（H₂）生成的最佳条件。采用气相色谱-热导检测器（GC-TCD）确认氢的产生，并验证气态氮的不存在。除了溶液阶段的分析，这些发现为可溶性副产物的形成提供了明确的证据，主要是亚硝酸盐（NO₂−）和硝酸盐（NO₃−），因为这两种物质都在我们的测量中被检测和量化了。法拉第效率达到98%，而能源效率从59%到75%不等。结果与现有文献进行了比较，强调了氨作为可持续氢载体的潜力，并强调了该工艺在水介质中的当前局限性。

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来源期刊

Electrochemistry Communications 工程技术-电化学

CiteScore

8.50

自引率

3.70%

发文量

160

审稿时长

1.2 months

期刊介绍： Electrochemistry Communications is an open access journal providing fast dissemination of short communications, full communications and mini reviews covering the whole field of electrochemistry which merit urgent publication. Short communications are limited to a maximum of 20,000 characters (including spaces) while full communications and mini reviews are limited to 25,000 characters (including spaces). Supplementary information is permitted for full communications and mini reviews but not for short communications. We aim to be the fastest journal in electrochemistry for these types of papers.