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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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