Surface Nonpolarization of g‐C3N4 by Decoration with Sensitized Quantum Dots for Improved CO2 Photoreduction,ChemSusChem

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Surface Nonpolarization of g‐C3N4 by Decoration with Sensitized Quantum Dots for Improved CO2 Photoreduction
ChemSusChem ( IF 7.5 ) Pub Date : 2018-11-26 , DOI: 10.1002/cssc.201802065
Huajun Feng _{1,

2} , Qiaoqi Guo _{1,

2} , Yingfeng Xu _{1,

2} , Ting Chen _{1,

2} , Yuyang Zhou _{1,

2} , Yigang Wang _{1,

2} , Meizhen Wang _{1,

2} , Dongsheng Shen _{1,

2}

Affiliation

Photocatalytic conversion of CO₂ can provide a solution for simultaneously addressing global warming and solar fuel generation. However, its applicability is presently limited by the unsatisfactory photoconversion efficiency of the state‐of‐art photocatalysts. In this regard, enhancing CO₂ adsorption through surface modification could be an efficient way to improve the photoconversion efficiency. Herein, doping of nonpolar carbon quantum dots (CQDs) onto g‐C₃N₄ is reported for the construction of a metal‐free heterojunction photocatalyst (CQDs/g‐C₃N₄). CQDs offer several advantages such as band‐gap reduction and electron‐withdrawing effect to improve light absorption and photocarrier separation efficiency. However, this study reveals that nonpolar CQDs could also improve CO₂ adsorption, photoinduced H₂ production, reaction kinetics, and alter CO₂ photoreduction pathways to generate CH₄. Consequently, the CQDs/g‐C₃N₄ could generate six times more CO and CH₄ without detectable H₂ compared to pristine g‐C₃N₄, under similar conditions. Therefore, this study demonstrates a promising strategy for efficient adsorption, activation, and subsequent photoreduction of CO₂ by nonpolar surface modification of g‐C₃N₄.

中文翻译：

g-C3N4的表面非极化通过敏化量子点修饰来改善CO2光还原

CO _2的光催化转化可以提供一种解决方案，用于同时解决全球变暖和太阳能燃料的产生。但是，目前它的适用性受到最先进的光催化剂光转换效率不令人满意的限制。在这方面，通过表面改性增强CO ₂吸附可能是提高光转化效率的有效方法。在此，据报道在g-C ₃ N ₄上掺杂了非极性碳量子点（CQDs），用于构建无金属异质结光催化剂（CQDs / g-C ₃ N ₄）。CQD具有许多优点，例如能带隙减小和电子吸收效应，可提高光吸收和光载流子分离效率。但是，这项研究表明，非极性CQDs还可以改善CO ₂吸附，光诱导H _2的产生，反应动力学以及改变CO _2的光还原途径以生成CH ₄。因此，与原始g-C ₃ N ₄相比，CQDs / g-C ₃ N ₄生成的CO和CH _4在没有可检测的H _2的情况下要多六倍，在类似条件下。因此，这项研究证明了通过g-C ₃ N _4的非极性表面修饰有效吸附，活化和随后光还原CO ₂的有前途的策略。

更新日期：2018-11-26

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