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Citation: Zheng Chen, Qinge Huang, Baokun Huang, Fuxiang Zhang, Can Li. A hydrated amorphous iron oxide nanoparticle as active water oxidation catalyst[J]. Chinese Journal of Catalysis, ;2019, 40(1): 38-42. doi: 10.1016/S1872-2067(18)63190-0 shu

A hydrated amorphous iron oxide nanoparticle as active water oxidation catalyst

State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian National Laboratory for Clean Energy, Dalian 116023, Liaoning, China

Received Date: 15 October 2018
Revised Date: 22 October 2018

Fund Project: This work was supported by the Basic Research Program of China (973 Program, 2014CB239403), National Natural Science Foundation of China (21522306, 21633009), and Key Research Program of Frontier Sciences, CAS (QYZDY-SSW-JSC023).

Developing efficient water oxidation catalysts (WOCs) with earth-abundant elements still remains a challenging task for artificial photosynthesis. Iron-based WOC is a promising candidate because it is economically cheap, little toxic and environmentally friendly. In this study, we found that the catalytic water oxidation activity on amorphous iron-based oxide/hydroxide (FeO_x) can be decreased by an order of magnitude after the dehydration process at room temperature. Thermogravimetric analysis, XRD and Raman results indicated that the dehydration process of FeO_x at room temperature causes the almost completely loss of water molecule with no bulk structural changes. Based on this finding, we prepared hydrated ultrasmall (ca. 2.2 nm) FeO_x nanoparticles of amorphous feature, which turns out to be extremely active as WOC with turnover frequency (TOF) up to 9.3 s^-1 in the photocatalytic Ru(bpy)₃²⁺-Na₂S₂O₈ system. Our findings suggest that future design of active iron-based oxides as WOCs requires the consideration of their hydration status.
- Artificial photosynthesis,
- Water oxidation,
- Iron oxide,
- Hydration,
- Amorphous
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