Abstract The efficient separation and transfer of photogenerated charge carriers play indispensable roles in improving the photocatalytic H2 evolution activity. Herein, we designed a Ni2O3-modified Mn0.2Cd0.8S/Cu3P@Cu2S (MCS/CPS) p-n heterojunction structure with a porous morphology for efficient and stable photocatalytic H2 evolution under visible-light irradiation. Novel porous Cu3P@Cu2S was obtained using a vulcanization method and Cu2S nanoparticles were grown uniformly in situ on the surface of Cu3P. Ni2O3 was adopted as a co-catalyst on the MCS/CPS p-n heterojunction surfaces to promote electrons transfer. Due to the synergistic effects of the co-catalyst, p-n heterojunction, and porous morphology, the as-synthesized Ni2O3/MCS/CPS composite with 9 wt% Ni2O3 and 2.5 wt% CPS exhibits an optimal photocatalytic H2 evolution rate of 9.2 mmol g−1 h−1, which is 14.4 and 2.4 times higher than those of pure MCS and 9%Ni2O3/MCS, respectively. Meanwhile, the optimal sample exhibits an apparent quantum efficiency of 33.5% at 420 nm and an excellent stability under 20 h of irradiation. Moreover, a possible mechanism for the improved photoactivity of the as-synthesized Ni2O3/MCS/CPS composite has been discussed in this paper.

中文翻译：

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利用助催化剂、pn 异质结和多孔结构的协同效应改善多孔 Ni2O3/Mn0.2Cd0.8S/Cu3P@Cu2S 中的可见光光催化析氢

摘要 光生载流子的有效分离和转移对提高光催化析氢活性起着不可或缺的作用。在此，我们设计了一种 Ni2O3 修饰的 Mn0.2Cd0.8S/Cu3P@Cu2S（MCS/CPS）pn 异质结结构，具有多孔形态，可在可见光照射下高效稳定地光催化析氢。使用硫化方法获得了新型多孔 Cu3P@Cu2S，Cu2S 纳米颗粒在 Cu3P 表面原位均匀生长。Ni2O3 被用作 MCS/CPS pn 异质结表面的助催化剂以促进电子转移。由于助催化剂、pn 异质结和多孔形态的协同作用，合成的 Ni2O3/MCS/CPS 复合材料与 9 wt% Ni2O3 和 2.5 wt% CPS 的最佳光催化析氢速率为 9。2 mmol g-1 h-1，分别是纯 MCS 和 9%Ni2O3/MCS 的 14.4 倍和 2.4 倍。同时，最佳样品在 420 nm 处表现出 33.5% 的表观量子效率，并且在 20 小时的照射下具有出色的稳定性。此外，本文还讨论了提高合成的 Ni2O3/MCS/CPS 复合材料光活性的可能机制。