Semiconductor photocatalytic hydrogen evolution (PHE) is used to convert solar energy to hydrogen energy. Therefore, a low-cost, effective, and dependable photocatalyst could be a viable solution to environmental and energy crises. However, performing energy-conversion reactions by preparing photocatalysts with suitable photoabsorption and effective charge separation is challenging. Herein, a novel CoMn₂O₄-ZnIn₂S₄ (CMO-ZIS) hollow microcube composite catalyst with a p-n heterojunction is constructed, in which ZnIn₂S₄ nanosheets are grown in situ on the surfaces of CoMn₂O₄ hollow microcubes. Surprisingly, 10% CoMn₂O₄-ZnIn₂S₄ (CMO-ZIS-10) exhibits a PHE rate of up to 11.04 mmol h⁻¹ g⁻¹, which is approximately 3.6 times higher than that of pure ZnIn₂S₄. In addition, to maintain the excellent visible light absorption efficiency of ZnIn₂S₄ nanosheets, the close-contact heterogeneous interface of CMO-ZIS enables easy separation and transfer of the carriers. Furthermore, the hollow structure increases the absorption efficiency of sunlight and provides more active sites, thus increasing the reactivity of photocatalyst. In this paper, we report a workable approach for building heterojunction photocatalysts powered by water splitting.

半导体光催化析氢 (PHE) 用于将太阳能转化为氢能。因此，低成本、有效且可靠的光催化剂可能是解决环境和能源危机的可行方案。然而，通过制备具有合适的光吸收和有效电荷分离的光催化剂来进行能量转换反应具有挑战性。在此，构建了一种新型的具有pn异质结的CoMn ₂ O ₄ -ZnIn ₂ S ₄ (CMO-ZIS)空心微立方体复合催化剂，其中ZnIn ₂ S ₄纳米片原位生长在CoMn ₂ O ₄空心微立方体的表面上. 令人惊讶的是，10% CoMn ₂O ₄ -ZnIn ₂ S ₄ (CMO-ZIS-10) 表现出高达 11.04 mmol h ^-1 g ^-1的 PHE 速率，比纯 ZnIn ₂ S ₄高约 3.6 倍。_{此外，保持ZnIn 2} S ₄优异的可见光吸收效率纳米片，CMO-ZIS 的紧密接触异质界面使载体易于分离和转移。此外，中空结构提高了对太阳光的吸收效率，提供了更多的活性位点，从而提高了光催化剂的反应活性。在本文中，我们报告了一种构建由水分解驱动的异质结光催化剂的可行方法。