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Title: Solvation effects on the band edge positions of photocatalysts from first principles

Journal Article · · Physical Chemistry Chemical Physics. PCCP
DOI:https://doi.org/10.1039/c5cp05740j· OSTI ID:1457527

The band edge positions of photocatalysts relative to the redox potentials of water play an important role in determining the efficiency of photoelectrochemical cells. These band positions depend on the structure of the solid–liquid interface, but direct ab initio molecular dynamics calculations of these interfaces, while expected to be accurate, are too computationally demanding for high-throughput materials screening. Thus rapid theoretical screening of new photocatalyst materials requires simplified continuum solvation models that are suitable for treating solid–liquid interfaces. In this paper, we evaluate the accuracy of the recently developed CANDLE and SaLSA continuum solvation models for predicting solvation effects on the band positions of several well-studied surfaces [Si(111), TiO2(110), IrO2(110) and WO3(001)] in water. We find that the solvation effects vary considerably, ranging from <0.5 eV for hydrophobic surfaces, 0.5–1 eV for many hydrophilic oxide surfaces, to ~2 eV for oxygen-deficient surfaces. The solvation model predictions are in excellent agreement (within ~0.1 eV) with ab initio molecular dynamics results where available, and in good agreement (within ~0.2–0.3 eV) with experimental measurements. We also predict the energetics for surface oxygen vacancies and their effect on the band positions of the hydrated WO3(001) surface, leading to an explanation for why the solvation shift observed experimentally is substantially larger than predicted for the ideal surface. Finally, based on the correlation between solvation shift and the type of surface and solvent, we suggest approaches to engineer the band positions of surfaces in aqueous and non-aqueous solutions.

Research Organization:
Joint Center for Artificial Photosynthesis, Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0004993
OSTI ID:
1457527
Journal Information:
Physical Chemistry Chemical Physics. PCCP, Vol. 17, Issue 45; ISSN 1463-9076
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 44 works
Citation information provided by
Web of Science

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Cited By (12)

Computational Approaches to Photoelectrode Design through Molecular Functionalization for Enhanced Photoelectrochemical Water Splitting journal November 2018
Sintering densification behaviors and crystallization characteristics of glass–ceramics formed by two types of CaO–B2O3–SiO2 glass journal May 2019
Modelling heterogeneous interfaces for solar water splitting journal January 2017
Ruthenium atomically dispersed in carbon outperforms platinum toward hydrogen evolution in alkaline media journal February 2019
Absolute band alignment at semiconductor-water interfaces using explicit and implicit descriptions for liquid water journal October 2019
The role of defects and excess surface charges at finite temperature for optimizing oxide photoabsorbers journal October 2018
Understanding the advantage of hexagonal WO 3 as an efficient photoanode for solar water splitting: a first-principles perspective journal January 2016
First-principles electrostatic potentials for reliable alignment at interfaces and defects journal March 2017
First-principles identification of localized trap states in polymer nanocomposite interfaces journal February 2020
Chemical and electronic structure analysis of a SrTiO3 (001)/p-Ge (001) hydrogen evolution photocathode journal March 2018
First-principles electrostatic potentials for reliable alignment at interfaces and defects text January 2016
Curved TiO 2 Nanoparticles in Water: Short (Chemical) and Long (Physical) Range Interfacial Effects journal June 2018

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