Leibniz Institute for Plasma Science and Technology (INP), Felix-Hausdorff-Str. 2, 17489 Greifswald, Germany.
ChemSusChem. 2013 Jan;6(1):152-9. doi: 10.1002/cssc.201200408. Epub 2012 Nov 26.
Visible-light-driven photocatalysis is currently attracting a great deal of attention because of its potential application in solar water splitting. However, the development of efficient and durable catalyst systems is still a challenging problem. In Ru dye-sensitised TiO(2) nanopowders, catalyst performances are found to decline as a result of poor bonding of the dye molecule to the TiO(2) surface and subsequent detachment and self-aggregation of the dye. Our strategy to improve the stability of the dye-TiO(2) interface is the encapsulation of the dye/TiO(2) assembly in an amino-group-containing polyallylamine layer anchored to TiO(2). A low-pressure pulsed microwave discharge plasma polymerization process was employed to coat a commercial anatase nanopowder with a thin polyallylamine layer to nanoconfine the adsorbed dye molecules. Electron microscopy and UV/Vis spectroscopy was carried out to characterise the resulting encapsulated nanostructures. The long-term stability of the new nanomaterial as the photoactive component of a water reduction catalyst system for H(2) evolution investigated in a slurry reactor under visible-light irradiation showed stable evolution rates over a period of several days.
可见光驱动的光催化因其在太阳能分解水方面的潜在应用而受到极大关注。然而，开发高效且耐用的催化剂体系仍然是一个具有挑战性的问题。在 Ru 染料敏化 TiO(2)纳米粉末中，由于染料分子与 TiO(2)表面的结合不良以及随后染料的脱离和自聚集，催化剂性能会下降。我们提高染料-TiO(2)界面稳定性的策略是将染料/TiO(2)组装体封装在氨基聚丙稀胺层中，该聚丙稀胺层固定在 TiO(2)上。采用低压脉冲微波放电等离子体聚合过程，在商业锐钛矿纳米粉末上包覆一层薄的聚丙稀胺层，以纳米限制吸附的染料分子。电子显微镜和紫外/可见光谱用于对所得封装的纳米结构进行表征。在浆态反应器中，在可见光照射下，作为还原水催化剂体系的光活性组件，对新型纳米材料的长期稳定性进行了研究，结果表明，在几天的时间内，其氢演化的稳定速率保持稳定。
