Newly developed photocatalysts usually focus on structuring active sites, for enhancing chemical adsorption and reducing activation energy barrier in photocatalysis nitrogen fixation. However, lots of photocatalysts suffer from electron-hole pairs’ recombination in the bulk or on the surface during transportation. Herein, twinned Zn_0.8Cd_0.2S nanocrystals were successfully applied to photocatalytic nitrogen fixation, affording an ammonia production rate of 66.91 μmol g⁻¹ h⁻¹ under visible light with an AQE of 3.77 % at 420 nm, which were 17-fold and 3-fold higher than the activities of CdS and ZnS, respectively. The inner homojunction enhanced carriers’ transportation, and improved electrons density on zinc blend segment, which could facilitate adsorption of nitrogen and ·H gaining, finally, the nitrogen activation and reduction proceeded through the six electrons reduction process on (111) facets. These results confirm that twinned Zn_0.8Cd_0.2S nanocrystal is a kind of promising new photocatalyst for solar-driven nitrogen reduction to ammonia.

新开发的光催化剂通常集中于结构化活性位点，以增强化学吸附并减少光催化固氮中的活化能垒。然而，许多光催化剂在运输过程中在主体或表面上遭受电子-空穴对的重组。在此，成功地将孪晶Zn _0.8 Cd _0.2 S纳米晶体用于光催化固氮，提供了66.91μmolg ^-1  h ^-1的氨生成速率。可见光在420 nm下的AQE为3.77％，分别比CdS和ZnS的活性高17倍和3倍。内部同质结增强了载流子的传输，并改善了锌共混物链段上的电子密度，可以促进氮的吸附和·H的获得，最后，通过（111）面的六个电子还原过程进行了氮的活化和还原。这些结果证实了孪生的Zn _0.8 Cd _0.2 S纳米晶是一种有前途的新型光催化剂，用于太阳能驱动的氮还原成氨。