The teams of Professor Lu Junling, Professor Yang Jinlong, and Professor Wei Shiqiang of the University of Science and Technology of China cooperated with atomic layer deposition to accurately construct the single-site Fe1(OH)x species on the surface of Pt metal nanoparticles supported by SiO2 for the first time, and then formed a novel Fe1(OH)x-Pt single-site interface catalyst structure. The result was published in Nature (Nature, 565, 631-635, 2019). In the oxidation reaction of carbon monoxide in a hydrogen-rich atmosphere, they used the catalyst for the first time in an ultra-wide temperature range of -75 °C to 110 °C to successfully achieve 100% selective carbon monoxide removal, breaking through the two major bottleneck limitations of the catalyst's high operating temperature and narrow temperature zone in the existing carbon monoxide oxidation reaction. This work has cleared major obstacles in order to lift the carbon monoxide "poison shock" crisis of hydrogen fuel cells, extend battery life, broaden the battery temperature environment and its civilian promotion. In this work, the researchers used the in-situ X-ray spectroscopy platform set up at the 1W1B-XAFS experimental station in Beijing synchrotron radiation facility and found that the structure of the Fe1(OH)x species in the catalytic reaction atmosphere is Fe1(OH)3. Fe1 atoms form Fe1-Pt metal bonds with Pt atoms on the surface of Pt nanoparticles. They also surprisingly found that this species has ultra-high reduction characteristics, Pt-Fe1(OH)2 could be generated by hydrogen reduction at room temperature, and the formed Pt-Fe1(OH)3 single-point interface is its catalytic active center, revealing its catalytic reaction mechanism.
Fig. Proposed reaction pathway for CO oxidation on Fe1(OH)3@ Pt (100)
Article:
Lina Cao, Wei Liu, Qiquan Luo, Ruoting Yin, Bing Wang, Jonas Weissenrieder, Markus Soldemo, Huan Yan, Yue Lin, Zhihu Sun, Chao Ma, Wenhua Zhang, Si Chen, Hengwei Wang, Qiaoqiao Guan, Tao Yao, Shiqiang Wei*, Jinlong Yang* & Junling Lu* , Atomically dispersed iron hydroxide anchored on Pt for preferential oxidation of CO in H2. Nature, 2019, 565, 631.
