Balancing competing reactions in hydride transfer catalysis via catalyst surface doping: the ionization energy descriptor.

Author(s) Xu, S.; Carter, E.A.
Journal J Am Chem Soc
Date Published 2019 May 30
Abstract

Hydride transfer (HT) is ubiquitous in catalytic reduction reactions. In heterogeneous electrocatalysis, the hydride donor could be a molecular catalytic intermediate adsorbed on an electrode surface. The stability and hydride-donating capability of such an intermediate may determine overall catalytic efficiency. Here, we report how to fine-tune a hydride donor's performance via doping an electrode surface. For semiconductor electrodes, we find that the ionization energy of the surface dopant can serve as a good descriptor for both the stability and hydride-donating capability of the catalytic intermediate adsorbed on the doped site. For the specific case of CO2 reduction on p-GaP, where adsorbed 2-pyridinide (2-PyH-*) was predicted to be the most likely hydride-donating species, we predict that its catalytic performance should be particularly enhanced by substituting Ga with Ti on the electrode surface; Sc, Al, and V surface dopants also could be worthy of further investigation.

DOI 10.1021/jacs.9b02897
ISSN 1520-5126
Citation Xu S, Carter EA. Balancing competing reactions in hydride transfer catalysis via catalyst surface doping: the ionization energy descriptor. J Am Chem Soc. 2019.

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