Black TiO₂ in various forms has been investigated for numerous photochemical applications. In photocatalytic water splitting, “grey” titania forms have been reported to reach considerable H₂ generation rates without using a noble metal co‐catalyst. Up to now, a variety of anatase powders or other morphologies has been investigated in grey and black forms. Here we describe that hydrothermal titanate/anatase nanotubes can show a strong noble metal free photocatalytic activity. For optimized “blackening” conditions, a drastically higher photocatalytic H₂ production can be obtained than for other nanoscale morphologies. This effect can further be improved with a very mild Pt doping that again shows a clearly stronger photocatalytic H₂ production than comparably loaded nanopowders.

中文翻译：

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从多壁钛酸盐纳米管建立高光催化氢气释放

已经研究了多种形式的黑色TiO ₂用于多种光化学应用。据报道，在光催化水分解中，“灰色”二氧化钛形式可在不使用贵金属助催化剂的情况下达到相当高的H ₂生成速率。迄今为止，已经研究了多种灰色和黑色形式的锐钛矿粉或其他形态。在这里，我们描述了水热钛酸盐/锐钛矿型纳米管可以显示出强大的无贵金属自由光催化活性。对于优化的“黑化”条件，与其他纳米级形态相比，可以获得更高的光催化H ₂产生量。通过非常轻度的Pt掺杂可以进一步改善该效果，这种掺杂再次显示出明显更强的光催化H ₂ 产量要比同等负载的纳米粉。