Photo/electrocatalytic ammonia synthesis has recently developed fast while the ammonia yields over state-of-the-art photo/electrocatalysts are still very moderate. Such low concentration of synthesized NH3 brings about a challenge to the reliable quantification of the product in photo/electrocatalysis. Notably, we found that the quantitative detection of ammonia concentration below 0.2 ppm is error-prone, which is likely the case happening in the majority of photo/electrocatalytic NH3 synthesis, thus arising concerns about the rationality and accuracy for low-concentration ammonia quantification in these processes. Herein, we discuss the methodology used and analyze the reliability of various detection methods for the detection of trace ammonia in aqueous media. The challenges facing the detection of low concentration of ammonia in photo/electrocatalysis can be overcome by integration with multiple detection methods. According to the data presented, we also propose an effective criterion for precise quantification of ammonia, avoiding the unreasonable comparisons in photo/electrocatalytic ammonia synthesis.

中文翻译：

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揭示光/电催化中氨定量的雷区

光/电催化氨合成最近发展迅速，而最先进的光/电催化剂的氨产率仍然非常适中。如此低浓度的合成 NH3 给光/电催化中产物的可靠定量带来了挑战。值得注意的是，我们发现定量检测低于 0.2 ppm 的氨浓度容易出错，这在大多数光/电催化 NH3 合成中很可能发生，从而引起人们对低浓度氨定量的合理性和准确性的担忧。这些过程。在此，我们讨论了所使用的方法并分析了各种检测方法在检测水性介质中痕量氨时的可靠性。通过集成多种检测方法，可以克服在光/电催化中检测低浓度氨所面临的挑战。根据所提供的数据，我们还提出了精确定量氨的有效标准，避免了光/电催化氨合成中的不合理比较。