Artificial photocatalytic nitrogen fixation: Where are we now? Where is its future?

In this Perspective, we summarize recent advancements in photocatalytic nitrogen fixation since 1977, placing particular emphasis on the smart photocatalysts and reaction system design strategies, and also the quantification of products (e.g., NOx, nitrate and ammonia) in photocatalytic N-2 fixation experiments. We start with exploring fundamental aspects of N-2 photofixation, ranging from N-2 adsorption and activation, then N-2 fixation processes. Subsequently, we review the most appropriate test methods for ammonia quantification under particular testing conditions (thus avoiding the reporting of high yet erroneous NH3 yield). Further, an objective snapshot of the field as it currently stands is offered to researchers regarding the urgent need of a reliable and rigorous evaluation criteria, advanced photocatalysts and reaction system for maximizing photocatalytic performance together with the added value of the products, laying a firm platform for future photocatalytic nitrogen fixation technology development

Automated summary

This Perspective summarizes recent advancements in photocatalytic nitrogen fixation since 1977, focusing on smart photocatalysts, reaction system design strategies, and quantification of products. The authors explore fundamental aspects of N-2 photofixation and review appropriate test methods for ammonia quantification. They emphasize the need for reliable evaluation criteria, advanced photocatalysts, and reaction systems to maximize photocatalytic performance and product value, laying a solid foundation for future development in photocatalytic nitrogen fixation technology.