The development of metal-free composite heterojunction catalysts is essential for economical and environmentally friendly carbon dioxide (CO) conversion technologies. Most studies neglect the semiconductor property of graphene oxide (GO), which has the potential to participate in the construction of heterojunction catalysts. In this work, a novel organic-inorganic composite metal-free heterojunction photocatalyst was constructed for the photocatalytic CO reduction. Photo-reduced GO (PRGO) and sp-carbon-chain triazine-based covalent organic framework (TP-COF) can be easily combined and form heterojunctions by a simple and green electrostatic self-assembly method through π-π interaction. The photogenerated electrons were transferred from the conduction band of PRGO to the valence band of TP-COF driven by energy band bending and built-in electric field, thus achieving effective charges separation. The strong reductive electrons on this S-scheme heterojunction efficiently and selectively reduced CO to CO. This work provides a new idea for designing GO-based heterojunction photocatalyst PRGO/TP-COF with potential application in CO photoreduction.

中文翻译：

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构建新型无金属异质结构光催化剂 PRGO/TP-COF 以增强光催化 CO2 还原

开发无金属复合异质结催化剂对于经济且环保的二氧化碳（CO）转化技术至关重要。大多数研究忽略了氧化石墨烯（GO）的半导体特性，而氧化石墨烯有潜力参与异质结催化剂的构建。在这项工作中，构建了一种新型有机-无机复合无金属异质结光催化剂，用于光催化CO还原。光还原GO（PRGO）和sp-碳链三嗪基共价有机骨架（TP-COF）可以通过π-π相互作用，通过简单、绿色的静电自组装方法轻松组合并形成异质结。在能带弯曲和内置电场的驱动下，光生电子从PRGO的导带转移到TP-COF的价带，从而实现有效的电荷分离。这种S型异质结上的强还原性电子有效、选择性地将CO还原为CO。这项工作为设计基于GO的异质结光催化剂PRGO/TP-COF提供了新的思路，并在CO光还原方面具有潜在的应用。