Single-Atom\nMo Supported by TiO<sub>2</sub> for Photocatalytic\nNitrogen Fixation

The challenge of achieving efficient photocatalysts for\nthe fixation\nof ambient nitrogen to ammonia persists. The utilization efficiency\nof single-metal-atom catalysts leads to an increased number of active\nsites, while their distinctive geometrical and electronic characteristics\ncontribute to enhancing the intrinsic activity of each individual\nsite. In this study, we present a method using an organic molecule\nto assist in loading TiO<sub>2</sub> with Mo single atoms for the\npurpose of photocatalytic nitrogen fixation. By adjusting the number\nof Mo single atoms loaded, we were able to regulate the microenvironment\nsurrounding the catalytic center. Our results demonstrate that TiO<sub>2</sub>–Mo10 achieved a remarkable photocatalytic nitrogen\nfixation performance of 42.05 μmol·g<sup>–1</sup>·h<sup>–1</sup> at room temperature while maintaining\nexcellent structural stability and cycle life. The incorporation of\nMo single atoms effectively enhanced electron separation and migration\nwithin TiO<sub>2</sub>, leading to a significant weakening of the\nNN bond. This research highlights the potential for predesigning\nTiO<sub>2</sub>-based single-atom photocatalysts with tailored structures\nfor efficient nitrogen fixation through photocatalysis. These findings\noffer valuable insights for the future development and rational design\nof single-atom photocatalysts.