Li Rengui, Tao Xiaoping, Chen Ruotian, Fan Fengtao, Li Can
State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian, 116023 (P. R. Chin.
University of Science and Technology of China, Hefei, 230026 (P. R. China).
Chemistry. 2015 Oct 5;21(41):14337-41. doi: 10.1002/chem.201502562. Epub 2015 Aug 25.
Spatial separation of reduction sites and oxidation sites to inhibit the recombination of photogenerated electrons and holes plays a vital role in improving the efficiency of photocatalyst systems. It is very challenging to rationally deposit cocatalysts on the right facets (sites), namely, the reduction cocatalyst on the reduction facets (sites) and the oxidation cocatalyst on the oxidation facets (sites). Herein, we report that the reduction and oxidation cocatalysts can be selectively constructed on the different facets of p-type Cu2 O crystals with anisotropic facets, but not on the Cu2 O crystal with isotropic facets. The deposition of dual cocatalysts on the different facets resulted in a remarkable synergetic effect in the photocatalytic performance, which could be attributed to the spatial separation of the photogenerated charges between facets. Our work reports an instructive strategy for constructing high-efficiency photocatalyst systems for solar energy conversion.
还原位点和氧化位点的空间分离以抑制光生电子和空穴的复合，这对提高光催化剂体系的效率起着至关重要的作用。合理地将助催化剂沉积在正确的晶面（位点）上，即在还原晶面（位点）上沉积还原助催化剂，在氧化晶面（位点）上沉积氧化助催化剂，是极具挑战性的。在此，我们报道还原和氧化助催化剂可以选择性地构建在具有各向异性晶面的p型Cu2O晶体的不同晶面上，但不能构建在具有各向同性晶面的Cu2O晶体上。在不同晶面上沉积双助催化剂在光催化性能上产生了显著的协同效应，这可归因于不同晶面之间光生电荷的空间分离。我们的工作报道了一种用于构建高效太阳能转换光催化剂体系的指导性策略。
