State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023, China.
J Am Chem Soc. 2013 Oct 16;135(41):15314-7. doi: 10.1021/ja408574m. Epub 2013 Oct 7.
High specific activity and cost effectiveness of single-atom catalysts hold practical value for water gas shift (WGS) reaction toward hydrogen energy. We reported the preparation and characterization of Ir single atoms supported on FeO(x) (Ir1/FeO(x)) catalysts, the activity of which is 1 order of magnitude higher than its cluster or nanoparticle counterparts and is even higher than those of the most active Au- or Pt-based catalysts. Extensive studies reveal that the single atoms accounted for ∼70% of the total activity of catalysts containing single atoms, subnano clusters, and nanoparticles, thus serving as the most important active sites. The Ir single atoms seem to greatly enhance the reducibility of the FeO(x) support and generation of oxygen vacancies, leading to the excellent performance of the Ir1/FeO(x) single-atom catalyst. The results have broad implications on designing supported metal catalysts with better performance and lower cost.
单原子催化剂具有高比活性和成本效益，在氢能的水气变换（WGS）反应中具有实际价值。我们报道了负载在 FeO(x)（Ir1/FeO(x)）上的 Ir 单原子催化剂的制备和表征，其活性比其团簇或纳米颗粒对应物高 1 个数量级，甚至高于最活跃的 Au 或 Pt 基催化剂。广泛的研究表明，单原子占含有单原子、亚纳米团簇和纳米颗粒的催化剂总活性的约 70%，因此是最重要的活性位。Ir 单原子似乎极大地增强了 FeO(x)载体的还原性和氧空位的生成，从而导致 Ir1/FeO(x)单原子催化剂具有优异的性能。这些结果对设计具有更好性能和更低成本的负载型金属催化剂具有广泛的意义。
