Polymeric carbon nitride (C₃N₄) is a very attractive candidate to produce photocatalytic hydrogen peroxide (H₂O₂) due to its low-cost, metal-free characteristics. However, the low efficiency would limit its development to higher yields because of insufficient light absorption and electron-hole separation. Here, we developed a simple method to anchor CN quantum dots (QDs) onto g-C₃N₄ nanosheets to form a homojunction structure (HJ-C₃N₄), which could improve photocatalytic performance largely without introducing metal elements. Its superior efficiency is a result of the band alignment by the homojunction structure providing excellent electron-hole separation and QDs providing suppressed recombination. Simultaneously, the light responsiveness of QDs endows a wide spectrum-responsive adsorption and enhances the adsorption intensity. The H₂O₂ yield of the HJ-C₃N₄ reached 115 μmol L⁻¹ h⁻¹ in pure water by visible light, which has an 8.6x higher production than g-C₃N₄ nanosheets. The material design of 0D/2D homojunction could be extended to other materials with specific band alignment.

聚合氮化碳 (C ₃ N ₄ )由于其低成本、无金属特性而成为生产光催化过氧化氢 (H ₂ O ₂ )的非常有吸引力的候选者。然而，由于光吸收和电子-空穴分离不足，低效率将限制其向更高产率的发展。在这里，我们开发了一种简单的方法将 CN 量子点 (QD) 锚定到 gC ₃ N ₄纳米片上以形成同质结结构 (HJ-C ₃ N ₄)，这可以在不引入金属元素的情况下大大提高光催化性能。其卓越的效率是同质结结构的能带对齐的结果，提供了出色的电子 - 空穴分离和 QD 提供了抑制复合。同时，量子点的光响应性赋予了宽光谱响应吸附并增强了吸附强度。在可见光下，HJ-C ₃ N ₄在纯水中的 H ₂ O ₂产率达到 115 μmol L ^-1 h ^-1，比 gC ₃ N _{4 的}产率高 8.6 倍纳米片。0D/2D 同质结的材料设计可以扩展到具有特定能带排列的其他材料。