Owing to maximally exposed active sites and a unique electronic structure, atomically thin two-dimensional semiconductor catalysts and atomic-scale metal co-catalysts are beyond their conventional bulk limit, especially for catalysis. Here, we report a two-dimensional titania (2DT) sheet-supported atomic-scale palladium (Pd₁/2DT) via a stepwise solvothermal reaction and photochemical reduction approach. Such synthesized 2DT sheets have a layer structure, with a measured optical onset at ∼2.86 eV. An atomically thick 2D structure not only exhibits short-distance migration of photo-induced charge carriers but also provides more anchoring sites to stabilize atomic-scale Pd₁ species, thus promoting the separation of charge carriers and stability of Pd₁. This Pd₁/2DT can catalyze methane conversion to methanol with a selectivity of 94% by using low-energy photons (λ > 420 nm) of solar light. Our work demonstrates that atomically low-dimensional catalysts can result in new and useful catalytic behaviors.

中文翻译：

---

用于将甲烷选择性氧化成甲醇的二维二氧化钛片上的原子级 Pd

由于最大暴露的活性位点和独特的电子结构，原子级薄的二维半导体催化剂和原子级金属助催化剂超出了它们传统的体积限制，尤其是在催化方面。在这里，我们通过逐步溶剂热反应和光化学还原方法报告了二维二氧化钛 (2DT) 片状支撑的原子级钯 (Pd ₁ /2DT)。这种合成的 2DT 片具有层状结构，测得的光学起始值为 ~2.86 eV。原子级厚的二维结构不仅表现出光致电荷载流子的短距离迁移，而且还提供了更多的锚定位点来稳定原子级 Pd ₁物种，从而促进电荷载流子的分离和 Pd _{1 的}稳定性。这个钯₁ /2DT可以利用太阳光的低能光子（λ> 420 nm）以94%的选择性催化甲烷转化为甲醇。我们的工作表明，原子级低维催化剂可以产生新的有用的催化行为。