Role of Heteroatoms in S,N‐Codoped Nanoporous Carbon Materials in CO2 (Photo)electrochemical Reduction,ChemSusChem

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Role of Heteroatoms in S,N‐Codoped Nanoporous Carbon Materials in CO2 (Photo)electrochemical Reduction
ChemSusChem ( IF 7.5 ) Pub Date : 2018-07-19 , DOI: 10.1002/cssc.201801073
Wanlu Li _{1,

2} , Teresa J. Bandosz _{1,

2}

Affiliation

Thiourea‐modified wood‐based activated carbon materials were evaluated as catalysts for the CO₂ electrochemical reduction reaction (CO₂ERR). The materials obtained at 950 °C showed long‐term stability. The results indicated that thiophenic sulfur provides the catalytic activity for CO formation. However, it was not as active for CH₄ formation as was pyridinic N. Tafel plots suggested that the nanoporous structure enhanced the kinetics for CO₂ reduction. The electric conductivity limited the activity for CO₂ERR in the materials modified at 600, 800, and 900 °C. The effect of visible light on CO₂ERR was also investigated in this study. Upon irradiation, photocurrent was generated, and the current density increased during the CO₂ reduction process. Combined with a band‐gap alignment, the results indicate that thiophenic S in the carbon matrix contributed to the sample's photoactivity in visible light. These species enhance the overall reduction process, promoting both the hydrogen evolution reaction and CO₂ reduction to CO.

中文翻译：

S，N-掺杂的纳米多孔碳材料中杂原子在CO2（光）电化学还原中的作用

硫脲改性的木质活性炭材料被评估为用于CO ₂电化学还原反应（CO ₂ ERR）的催化剂。在950°C下获得的材料显示出长期稳定性。结果表明，噻吩硫为一氧化碳的形成提供了催化活性。但是，它对CH ₄形成的活性不如吡啶二氮。Tafel图表明，纳米孔结构增强了CO ₂还原的动力学。电导率限制了在600、800和900°C下改性的材料中CO ₂ ERR的活性。可见光对CO _2的影响ERR也进行了这项研究。照射后，产生光电流，并且在CO ₂还原过程中电流密度增加。结合带隙比对，结果表明碳基质中的噻吩S有助于样品在可见光下的光活性。这些物质增强了整个还原过程，促进了氢气释放反应和将CO ₂还原为CO的过程。

更新日期：2018-07-19

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