Recently, black and grey titania in various morphologies have been intensively investigated for their high performance in photocatalytic H₂ generation. Here we use titania nanosheets (NSs) with a large percentage of (001) facets and hydrogenate them to activate suitable Ti³⁺-O_v defects for co-catalyst free H₂ generation. Key to a highly active NS-catalyst is the prevention of serious deformation and sintering during the thermal hydrogenation. In this work, we present a systematic investigation of different thermally treated NSs characterized by scanning electron microscope, high resolution-transmission electron microscopy, TEM-energy-dispersive x-ray, x-ray diffraction, electron paramagnetic response, x-ray photoelectron spectroscopy, and photocatalytic H₂ evolution performance. We describe how to achieve robust grey NSs with an intact two-dimensional shape that can endure hydrogenation at the required high temperatures. Due to a defined faceting, these optimized ‘grey’ NSs can produce photocatalytic H₂ at a higher rate than previously reported best performing grey nanoparticles—this in spite of having a lower Brunauer–Emmett–Teller than the reduced nanoparticles.

最近，各种形态的黑色和灰色二氧化钛因其在光催化 H ₂生成中的高性能而受到深入研究。在这里，我们使用具有大量 (001) 面的二氧化钛纳米片 (NSs) 并对其进行氢化以激活合适的 Ti ³⁺ -O _v缺陷，从而获得无助催化剂的 H ₂一代。高活性 NS 催化剂的关键是在热氢化过程中防止严重变形和烧结。在这项工作中，我们通过扫描电子显微镜、高分辨率透射电子显微镜、TEM 能量色散 x 射线、x 射线衍射、电子顺磁响应、x 射线光电子能谱对不同的热处理 NSs 进行了系统研究。和光催化H ₂析出性能。我们描述了如何获得具有完整二维形状的坚固灰色 NSs，可以在所需的高温下承受氢化。由于定义了刻面，这些优化的“灰色”NSs 可以产生光催化 H ₂ 以比先前报道的性能最佳的灰色纳米粒子更高的速率——尽管比还原的纳米粒子具有更低的布鲁诺-埃米特-泰勒。