The electrochemical oxidation of ammonia to dinitrogen is a model reaction for the electrocatalysis of the nitrogen cycle, as it can contribute to the understanding of the making/breaking of NN, NO, or NH bonds. Moreover, it can be used as the anode reaction in ammonia electrolyzers for H₂ production or in ammonia fuel cells. We study here the reaction on the N₂-forming Pt(1 0 0) electrode using a combination of electrochemical methods, product characterization and computational methods, and suggest a mechanism that is compatible with the experimental and theoretical findings. We propose that N₂ is formed via an ^∗NH + ^∗NH coupling step, in accordance with the Gerischer-Mauerer mechanism. Other NN bond-forming steps are considered less likely based on either their unfavourable energetics or the low coverage of the necessary monomers. The NN coupling is inhibited by strongly adsorbed ^∗N and ^∗NO species, which are formed by further oxidation of ^∗NH.

氨到二氮的电化学氧化是氮循环电催化的模型反应，因为它有助于理解N N，N O或N H键的形成/断裂。此外，它可以在用于生产H _2的氨电解槽中或在氨燃料电池中用作阳极反应。我们在这里使用电化学方法，产物表征和计算方法相结合的方法研究在N ₂形成Pt（1 0 0）电极上的反应，并提出与实验和理论发现兼容的机理。我们建议N ₂通过^∗ NH +  ^∗形成根据Gerischer-Mauerer机理，进行NH偶联步骤。基于其他N N键形成步骤，可能是由于它们不利的能量或必需单体的覆盖率较低而被认为不太可能。N N耦合受到强烈吸附的^＊ N和^＊ NO物种的抑制，这些物质是由^＊ NH的进一步氧化形成的。