1. Tunable metal hydroxide-organic frameworks for catalysing oxygen evolution.
- Author
-
Yuan S, Peng J, Cai B, Huang Z, Garcia-Esparza AT, Sokaras D, Zhang Y, Giordano L, Akkiraju K, Zhu YG, Hübner R, Zou X, Román-Leshkov Y, and Shao-Horn Y
- Subjects
- Catalysis, Hydroxides, Metal-Organic Frameworks, Oxygen
- Abstract
The oxygen evolution reaction is central to making chemicals and energy carriers using electrons. Combining the great tunability of enzymatic systems with known oxide-based catalysts can create breakthrough opportunities to achieve both high activity and stability. Here we report a series of metal hydroxide-organic frameworks (MHOFs) synthesized by transforming layered hydroxides into two-dimensional sheets crosslinked using aromatic carboxylate linkers. MHOFs act as a tunable catalytic platform for the oxygen evolution reaction, where the π-π interactions between adjacent stacked linkers dictate stability, while the nature of transition metals in the hydroxides modulates catalytic activity. Substituting Ni-based MHOFs with acidic cations or electron-withdrawing linkers enhances oxygen evolution reaction activity by over three orders of magnitude per metal site, with Fe substitution achieving a mass activity of 80 A [Formula: see text] at 0.3 V overpotential for 20 h. Density functional theory calculations correlate the enhanced oxygen evolution reaction activity with the MHOF-based modulation of Ni redox and the optimized binding of oxygenated intermediates., (© 2022. The Author(s), under exclusive licence to Springer Nature Limited.)
- Published
- 2022
- Full Text
- View/download PDF