Recently discovered graphdiyne (GDY) is a unique two‐dimensional (2D) planar structure with a high‐degree π‐conjunction network composed of sp and sp² hybridized carbon bonds. GDY has high carrier mobility, rich chemical bond properties, and having a bandgap of ≈2.1 eV. In this study, for the first time, g‐C₃N₄/NiFe‐layered double hydroxide (LDH) is decorated by GDY to obtain a new strongly coupled ternary nanocomposite g‐C₃N₄/GDY/NiFe‐LDH, which has hierarchical mesoporous layered structure, large surface area, and broad visible spectrum absorption. These properties make g‐C₃N₄/GDY/NiFe‐LDH nanocomposite an outstanding candidate for photoelectrochemical water oxidation. Therefore, the new architecture is analyzed and achieve a high photocurrent density of 178.66 µA cm⁻² by applying 1.4 V, a maximum incident photon‐to‐current efficiency (IPCE) of 3.59% at wavelength of 350 nm and 2.05% at 420 nm under standard AM 1.5G condition, which are also the best reported values in the literature. More interestingly, the proposed nanocomposite indicates a great durability, where there is nearly no dropping on the photocurrent under continuous illumination after 3600 s. This work suggests that additive engineering using GDY is an effective approach for the fabrication of efficient photoelectrochemical water oxidation devices.

中文翻译：

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石墨二炔与g-C3N4 / NiFe层状双氢氧化物偶联，层状纳米杂化物可实现高效光电化学水氧化

最近发现的石墨二炔（GDY）是一种独特的二维（2D）平面结构，具有由sp和sp ²杂化碳键组成的高度π结网络。GDY具有高的载流子迁移率，丰富的化学键合特性，并具有约2.1 eV的带隙。在这项研究中，首次用GDY装饰g‐C ₃ N ₄ / NiFe层状双氢氧化物（LDH），以获得新的强耦合三元纳米复合材料g‐C ₃ N ₄ / GDY / NiFe‐LDH，具有分层的介孔分层结构，较大的表面积和广泛的可见光谱吸收。这些性质使g‐C ₃ N ₄/ GDY / NiFe-LDH纳米复合材料是光电化学水氧化的杰出候选者。因此，对新架构进行了分析，并通过施加1.4 V电压实现了178.66 µA cm ^-2的高光电流密度，在350 nm波长下的最大入射光子电流效率（IPCE）为3.59％，在420 nm时为2.05％在标准AM 1.5G条件下，这也是文献中报道得最好的值。更有趣的是，提出的纳米复合材料显示出很高的耐久性，在3600 s后连续照射下光电流几乎没有下降。这项工作表明，使用GDY进行添加剂工程是制造高效光电化学水氧化装置的有效方法。