A cocktail strategy was developed to fabricate sandwich nanostructure of hydrogenated C-doped anatase TiO₂ nanocrystals/N-doped carbon [email protected]/rutile TiO₂ nanorod array as an efficient photocatalyst for photoelectrochemical water oxidation. The one-dimensional, single crystalline nature of the innermost rutile TiO₂ nanorod facilitates charge transport. The middle N-doped carbon [email protected] offers dual functionalities, with the N-doped carbon dots as the photosensitizer to harvest long wavelength lights and the N-doped carbon layer as the conductive layer for fast charge transport toward the current collector. The outermost hydrogenated C-doped anatase TiO₂ nanocrystals serve to increase the visible light absorption and to form a type II heterostructure with the innermost rutile TiO₂ nanorods to enahnce the charge separation. An enhancement of 86% in photocurrent density was achieved at 1.23 V (vs. RHE) under illumination of simulated sun light of 100 mW/cm² by the sandwich nanostrcuture, as compared to that of the plain rutile TiO₂ nanorod array. The enhancement was boosted to 228% under visible simulated sun light (λ > 400 nm) illumination. The photoconversion efficiency and photocurrent density retention rate were significantly improved from 0.23% and 60% for the plain rutile TiO₂ nanorod array to 0.65% and 84% for the sandwich nanostructure, respectively.

开发了一种鸡尾酒混合策略，以制备氢化的C掺杂的锐钛矿型TiO ₂纳米晶体/ N掺杂的碳（受电子邮件保护）/金红石型TiO ₂纳米棒阵列的三明治纳米结构，作为光电化学水氧化的有效光催化剂。最里面的金红石型TiO ₂纳米棒的一维单晶性质有助于电荷传输。中间的N掺杂碳（受电子邮件保护）具有双重功能，其中N掺杂碳点用作光敏剂，以收集长波长光，而N掺杂碳层作为导电层，用于快速向集电器传输电荷。最外层氢化C掺杂的锐钛矿型TiO ₂纳米晶体用于增加可见光吸收并与最里面的金红石型TiO ₂纳米棒形成II型异质结构以增强电荷分离。与普通金红石型TiO ₂纳米棒阵列相比，在100 mW / cm ²的模拟阳光照射下，在1.23 V（相对于RHE）下，通过三明治纳米结构在光电流密度上实现了86％的增强。在可见的模拟太阳光（λ> 400 nm）照射下，增强作用提高到228％。普通金红石型TiO ₂纳米棒阵列的光转换效率和光电流密度保持率分别从0.23％和60％显着提高到三明治纳米结构的0.65％和84％。