Oxygen vacancies and interfaces enhancing photocatalytic hydrogen production in mesoporous CNT/TiO2 hybrids
Oxygen vacancies and interfaces enhancing photocatalytic hydrogen production in mesoporous CNT/TiO2 hybrids
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DOI：
10.1016/j.apcatb.2015.05.052
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发表时间：
2015-12
影响因子：
22.1
通讯作者：
A. Moya;A. Cherevan;S. Marchesan;P. Gebhardt;M. Prato;D. Eder;J. Vilatela
中科院分区：
文献类型：
--
作者：
A. Moya;A. Cherevan;S. Marchesan;P. Gebhardt;M. Prato;D. Eder;J. Vilatela
我们展示了一种独特的介孔二氧化钛和碳纳米管/二氧化钛光催化剂分级组装的方法。所得到的材料显示出由高度结晶、连接良好的无机纳米晶组成的介孔网络，其光催化活性比个性化的二氧化钛纳米颗粒高一个数量级。少量的碳纳米管与二氧化钛的原位结合形成了电纺碳纳米管/二氧化钛杂化材料，进一步提高了氧化物的光催化活性，在紫外光照射下，在牺牲试剂存在的情况下，其分解水的析氢速率达到了1218MWCNT/μ/h。我们还讨论了氧空位对氧化物结晶和相变的影响。这些空位导致了带隙间状态和较低的平带电势，这有利于光催化过程。
We demonstrate a unique route towards hierarchical assemblies of mesoporous TiO2and CNT/TiO2photocatalysts by a combination of electrospinning and sol–gel methods. The resulting materials exhibit a mesoporous network of highly crystalline, well-connected inorganic nanocrystals with an order of magnitude higher photocatalytic activity than individualised TiO2nanoparticles. Thein-situcombination of small amounts of MWCNTs with TiO2to form an electrospun CNT/TiO2hybrid further enhanced the oxide photoactivity considerably, reaching hydrogen evolution rates of 1218 μmol/h in water splitting in the presence of sacrificial reagents under UV irradiation. We also discuss the effect of oxygen vacancies on the oxide crystallisation and phase transformation. These vacancies lead to inter-bandgap states and a lower flat band potential that facilitates the photocatalytic process.