Theoretical Design of Molecular Electrocatalysts with Flexible Pendant Amines for Hydrogen Production and Oxidation

Journal Article · Thu Feb 07 00:00:00 EST 2013 · The Journal of Physical Chemistry Letters, 4(3):542-546

DOI:https://doi.org/10.1021/jz3020277· OSTI ID:1117064

Fernandez, Laura; Horvath, Samantha; Hammes-Schiffer, Sharon

The design of hydrogen oxidation and production catalysts is important for the development of alternative renewable energy sources. The overall objective is to maximize the turnover frequency and minimize the overpotential. In an effort to assist in the design of such catalysts, we use computational methods to examine a variety of nickel-based molecular electrocatalysts with pendant amines. Our studies focus on the proton-coupled electron transfer (PCET) process involving electron transfer between the complex and the electrode and intramolecular proton transfer between the nickel center and the nitrogen of the pendant amine. The concerted PCET mechanism, which tends to require a lower overpotential, is favored by a smaller equilibrium Ni-N distance and a more flexible pendant amine ligand, thereby decreasing the energetic penalty for the nitrogen to approach the nickel center for proton transfer. These calculations provide design principles that will be useful for developing the next generation of hydrogen catalysts. This research was supported as part of the Center for Molecular Electrocatalysis, an Energy Frontier Research Center funded by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1117064
• Report Number(s): PNNL-SA-92343; KC0307010
• Journal Information: The Journal of Physical Chemistry Letters, 4(3):542-546, Journal Name: The Journal of Physical Chemistry Letters, 4(3):542-546
• Country of Publication: United States
• Language: English