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Enhanced visible-light photoreduction of CO2 to methanol over Mo2C/TiO2 surfaces in an optofluidic microreactor
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2020-11-09 , DOI: 10.1039/d0re00376j Jonathan Albo 1, 2, 3, 4 , Gonzalo García 4, 5, 6, 7, 8
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2020-11-09 , DOI: 10.1039/d0re00376j Jonathan Albo 1, 2, 3, 4 , Gonzalo García 4, 5, 6, 7, 8
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Inspired by the photosynthesis process used by plants, the photocatalytic conversion of CO2 with water to obtain chemical energy can tackle increasing CO2 emissions and energy demand together. In this work, the performance of Mo2C/TiO2 blends in the continuous photocatalytic reduction of CO2 to methanol is evaluated in a micro-optofluidic reactor illuminated with UV and visible LED lights (5 mW cm−2). The photo-responsive Mo2C/TiO2 surfaces applied are manufactured by airbrushing a photocatalytic ink containing different weight percent (2–10%) of Mo2C nanoparticles (synthesized by a carbothermal method) and TiO2 (P25) onto porous carbon paper. Doping TiO2 with Mo2C makes the composite material active in the visible region compared with bare TiO2, while it does not bring performance enhancement when the photoactive surfaces are illuminated with UV light. A 4% Mo2C weight percent led to enhanced stable production of methanol under visible light (r = 11.8 μmol g−1 h−1, AQY = 0.21%, SCH3OH/HCOOH = 12.1), which is ascribed to the presence of Mo2C, able to extend the spectral response as well as reduce the recombination rate of photogenerated electrons and holes occurring in TiO2. Higher Mo2C contents, however, seem to shield the photoexcitation capacity of TiO2.
中文翻译：
在光流微反应器中增强Mo2C / TiO2表面上CO2到甲醇的可见光光还原
受植物进行光合作用的启发，用水将CO 2光催化转化为化学能可以共同解决不断增长的CO 2排放和能源需求。在这项工作中，在用UV和可见LED灯（5 mW cm -2）照射的微光流体反应器中，评估了Mo 2 C / TiO 2混合物在将CO 2连续光催化还原为甲醇中的性能。所涂的光响应性Mo 2 C / TiO 2表面是通过喷枪喷涂含有不同重量百分比（2-10％）的Mo 2的光催化油墨而制成的将C纳米颗粒（通过碳热法合成）和TiO 2（P25）沉积到多孔碳纸上。与裸露的TiO 2相比，用Mo 2 C掺杂TiO 2使复合材料在可见光区域具有活性，而当用UV光照射光敏表面时，复合材料不会带来性能增强。Mo 2 C重量百分比为4％导致在可见光下增强甲醇的稳定生产（r = 11.8μmolg -1 h -1，AQY = 0.21％，S CH3OH / HCOOH = 12.1），这归因于存在钼2C，能够扩展光谱响应以及降低在TiO 2中发生的光生电子和空穴的复合速率。然而，较高的Mo 2 C含量似乎屏蔽了TiO 2的光激发能力。
更新日期：2020-11-19
中文翻译：
在光流微反应器中增强Mo2C / TiO2表面上CO2到甲醇的可见光光还原
受植物进行光合作用的启发，用水将CO 2光催化转化为化学能可以共同解决不断增长的CO 2排放和能源需求。在这项工作中，在用UV和可见LED灯（5 mW cm -2）照射的微光流体反应器中，评估了Mo 2 C / TiO 2混合物在将CO 2连续光催化还原为甲醇中的性能。所涂的光响应性Mo 2 C / TiO 2表面是通过喷枪喷涂含有不同重量百分比（2-10％）的Mo 2的光催化油墨而制成的将C纳米颗粒（通过碳热法合成）和TiO 2（P25）沉积到多孔碳纸上。与裸露的TiO 2相比，用Mo 2 C掺杂TiO 2使复合材料在可见光区域具有活性，而当用UV光照射光敏表面时，复合材料不会带来性能增强。Mo 2 C重量百分比为4％导致在可见光下增强甲醇的稳定生产（r = 11.8μmolg -1 h -1，AQY = 0.21％，S CH3OH / HCOOH = 12.1），这归因于存在钼2C，能够扩展光谱响应以及降低在TiO 2中发生的光生电子和空穴的复合速率。然而，较高的Mo 2 C含量似乎屏蔽了TiO 2的光激发能力。
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