Boosting the Photocatalytic Activity of P25 for Carbon Dioxide Reduction by using a Surface‐Alkalinized Titanium Carbide MXene as Cocatalyst,ChemSusChem

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Boosting the Photocatalytic Activity of P25 for Carbon Dioxide Reduction by using a Surface‐Alkalinized Titanium Carbide MXene as Cocatalyst
ChemSusChem ( IF 7.5 ) Pub Date : 2018-03-23 , DOI: 10.1002/cssc.201800083
Minheng Ye ₁ , Xin Wang ₁ , Enzuo Liu _{1,

2} , Jinhua Ye _{1,

2,

3} , Defa Wang _{1,

2}

Affiliation

Although they are widely used as cocatalysts in promoting photocatalysis, practical application of noble metals is limited by their high cost and rarity. Development of noble‐metal‐free cocatalysts is thus highly demanded. Herein titanium carbide (Ti₃C₂) MXene is shown to be a highly efficient noble‐metal‐free cocatalyst with commercial titania (P25) for photocatalytic CO₂ reduction. Surface alkalinization of Ti₃C₂ dramatically enhances the activity; the evolution rates of CO (11.74 μmol g⁻¹ h⁻¹) and CH₄ (16.61 μmol g⁻¹ h⁻¹) are 3‐ and 277‐times higher than those of bare P25, respectively. The significantly enhanced activity is attributed to the superior electrical conductivity and charge‐carrier separation ability, as well as the abundant CO₂ adsorption and activation sites of surface‐alkalinized Ti₃C₂ MXene, indicating its promise as a highly‐active noble‐metal‐free cocatalysts for photocatalytic CO₂ reduction.

中文翻译：

通过使用表面碱化的碳化钛二甲苯（MXene）作为助催化剂来提高P25的二氧化碳还原光催化活性

尽管它们广泛用作促进光催化的助催化剂，但是贵金属的实际应用受到其高成本和稀有性的限制。因此，迫切需要开发无贵金属的助催化剂。本文显示，碳化钛（Ti ₃ C ₂）MXene是一种高效的无贵金属助催化剂，可与商业二氧化钛（P25）一起用于光催化还原CO ₂。Ti ₃ C _2的表面碱化可显着提高活性。CO的释放速率（11.74微摩尔克^-1 ħ ^-1）和CH ₄（16.61微摩尔克^-1 ħ ^-1）分别比裸机P25高3倍和277倍。显着增强的活性归因于优异的电导率和电荷载流子分离能力，以及表面碱化的Ti ₃ C ₂ MXene的丰富CO ₂吸附和活化位点，表明其有望成为高活性贵金属用于光催化还原CO _2的无助催化剂。

更新日期：2018-03-23

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