Photoelectrochemical Hydrogen Production on alpha-Fe2O3 (0001): Insights from Theory and Experiments
Artikel i vetenskaplig tidskrift, 2014

The photoelectrochemical (PEC) decomposition of organic compounds in wastewater is investigated by using quantum chemical (DFT) methods to evaluate alternatives to water splitting for the production of renewable and sustainable hydrogen. Methanol is used as a model organic species for the theoretical evaluations of electrolysis on the surface of the widely available semiconductor hematite, alpha-Fe2O3, a widely studied photocatalyst. Three different alpha-Fe2O3 surface terminations were investigated, including the predominant surface found in aqueous electrolytes, (OH)(3)-R. The PEC oxidation of methanol is energetically downhill, producing CO2 and protons. The protons are reduced to hydrogen on the cathode. Experimental PEC measurements were also performed for several polyalcoholic compounds, glycerol, erythritol, and xylitol, on alpha-Fe2O3 as the photocatalyst and showed high incident-photon-to-current-efficiencies (IPCE) that were much greater than those of water splitting. Interestingly, high IPCEs were observed for hydrogen production from polyalcohols in the absence of any applied bias, which was not thought to be possible on hematite. These results support the potential application of PEC for hydrogen production by using widely available hematite for the PEC oxidation of selected components of organic wastewater present in large quantities from anthropogenic and industrial sources.

photochemistry

hematite

density functional calculations

hydrogen

electrochemistry

Författare

J. Baltrusaitis

MESA Institute for Nanotechnology

University of Iowa

Y. S. Hu

University of California

E. W. McFarland

University of California

Anders Hellman

Chalmers, Teknisk fysik, Kemisk fysik

ChemSusChem

1864-5631 (ISSN) 1864-564X (eISSN)

Vol. 7 162-171

Styrkeområden

Transport

Energi

Materialvetenskap

Infrastruktur

C3SE (Chalmers Centre for Computational Science and Engineering)

Ämneskategorier

Atom- och molekylfysik och optik

DOI

10.1002/cssc.201300715