Abstract The construction of heterojunction structures is considered as a promising method in the field of photocatalytic hydrogen evolution. Here, In-MOF precursor and melamine were mixed, then calcined and annealed to synthesize a series of In2O3/g-C3N4 heterojunction composites with multi-porosity. Porous and fluffy In2O3 provide a transmission channel, and the heterostructures can further accelerate electron transport due to the potential difference, thereby inhibiting the reorganization of electron-hole pairs. The In2O3/g-C3N4 photocatalytic hydrogen evolution average rate can reach 68.7 μmol h−1, which is almost 9.3 times that of pristine g-C3N4 (7.4 μmol h−1). Notably, the charge transfer process between In2O3/g-C3N4 heterostructure is investigated by DFT calculation. The results show that the polarization field prevents the recombination of electron-hole pairs and accelerates the transfer of photogenerated electrons so that the lifetime of photogenerated carriers is increased, ultimately enhancing the photocatalytic activity.

中文翻译：

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一种新型异质结构偶联 MOF 衍生的蓬松多孔氧化铟与 g-C3N4 以增强光催化活性

摘要 异质结结构的构建被认为是光催化析氢领域中一种很有前景的方法。在这里，将 In-MOF 前驱体和三聚氰胺混合，然后煅烧和退火以合成一系列具有多孔性的 In2O3/g-C3N4 异质结复合材料。多孔且蓬松的 In2O3 提供了传输通道，异质结构由于电位差可以进一步加速电子传输，从而抑制电子-空穴对的重组。In2O3/g-C3N4光催化析氢平均速率可达68.7 μmol h-1，几乎是原始g-C3N4（7.4 μmol h-1）的9.3倍。值得注意的是，通过 DFT 计算研究了 In2O3/g-C3N4 异质结构之间的电荷转移过程。