Energy Platform for Directed Charge Transfer in the Cascade Z-Scheme Heterojunction: CO 2 Photoreduction without a Cocatalyst
Energy Platform for Directed Charge Transfer in the Cascade Z-Scheme Heterojunction: CO 2 Photoreduction without a Cocatalyst
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级联 Z 型异质结中定向电荷转移的能量平台：无助催化剂的 CO 2 光还原
DOI：
10.1002/ange.202106929
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发表时间：
2021
影响因子：
--
通讯作者：
Bian J
中科院分区：
文献类型：
--
作者：
Bian J
提出了一种通用的策略来构建级联Z-Scheme系统，其中有效的能量平台是直接电荷转移和分离的核心，阻断了意想不到的II型电荷转移途径。尺寸匹配的（001）TiO 2-g-C3 N4/BiVO 4纳米片异质结（T-CN/BVNS）是第一个这样的模型。优化的级联Z-方案在可见光照射下，在没有助催化剂和昂贵的牺牲剂的情况下，与BVNS相比，CO2还原为CO的光活性提高了1.19倍，即使使用贵金属作为介体，这也上级其他报道的Z-方案系统。实验结果和基于超快时间尺度上的货车der Waals结构模型的DFT计算表明，引入的T作为平台，使空间分离的电子和空穴的寿命变短，并且不影响它们的还原和氧化电位.
A universal strategy is developed to construct a cascade Z‐Scheme system, in which an effective energy platform is the core to direct charge transfer and separation, blocking the unexpected type‐II charge transfer pathway. The dimension‐matched (001)TiO2‐g‐C3N4/BiVO4nanosheet heterojunction (T‐CN/BVNS) is the first such model. The optimized cascade Z‐Scheme exhibits ≈19‐fold photoactivity improvement for CO2reduction to CO in the absence of cocatalysts and costly sacrificial agents under visible‐light irradiation, compared with BVNS, which is also superior to other reported Z‐Scheme systems even with noble metals as mediators. The experimental results and DFT calculations based on van der Waals structural models on the ultrafast timescale reveal that the introduced T as the platform prolongs the lifetimes of spatially separated electrons and holes and does not compromise their reduction and oxidation potentials.