氮化碳
光催化
材料科学
钴
异质结
光催化分解水
氮化物
分解水
制氢
X射线光电子能谱
光化学
氢
化学
化学工程
纳米技术
催化作用
光电子学
有机化学
图层(电子)
工程类
冶金
作者
Yu‐Cheng Huang,Jie Chen,Ying‐Rui Lu,K. Arul,Takuji Ohigashi,Jeng-Lung Chen,Chyi‐Liang Chen,Shaohua Shen,Wu‐Ching Chou,Way‐Faung Pong,Chung‐Li Dong
标识
DOI:10.1016/j.elspec.2023.147319
摘要
The use of carbon nitride-based materials and light to drive catalytic water splitting has enormous potential for the production of hydrogen. Revealing the processes of molecular conjugation, nucleation, and crystallization in crystalline carbon nitride is expected to enhance the photocatalytic activity through the creation of isotype heterojunctions and active sites. In this work, the addition of cobalt salts in ionothermal synthesis was found to promote the phase transition of heptazine-based crystalline carbon nitride (CCN) to triazine-based poly (triazine imide) (PTI), resulting in the formation of a single-atom cobalt-doped coordinated isotype CCN/PTI heterojunction. The new hybrid orbital modulates the atomic/electronic structure and the band gap of the CCN/PTI heterojunction, and synergistically increases the absorption of visible light, accelerating the separation and transfer of photoexcited electrons and holes. Synchrotron-based X-ray spectroscopy and microscopy are used to identify the origin of the improved performance of the single-atom cobalt-doped CCN/PTI heterojunction in the photocatalytic hydrogen evolution reaction. This work demonstrates that synchrotron X-ray spectroscopy is a promising tool for designing materials aimed at enhancing photocatalytic activity in solar energy conversion applications.
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