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Tungsten oxide nanostructures and nanocomposites for photoelectrochemical water splitting

Journal Article · · Nanoscale
DOI:https://doi.org/10.1039/C9NR03474A· OSTI ID:1546539

Hydrogen production from photoelectrochemical (PEC) water splitting using semiconductor photocatalysts has attracted great attention to realize clean and renewable energy from solar energy. The visible light response of WO3 with a long hole diffusion length (~150 nm) and good electron mobility (~12 cm2 V–1 s–1) makes it suitable as the photoanode. Yet, WO3 suffers from issues including rapid recombination of photoexcited electron–hole pairs, photo-corrosion during the photocatalytic process due to the formation of peroxo-species, sluggish kinetics of photogenerated holes, and slow charge transfer at the semiconductor/electrolyte interface. Our report highlights the approaches to overcome these drawbacks of WO3 photoanodes, including: (i) the manipulation of nanostructured WO3 photoanodes to decrease the nanoparticle size to promote hole migration to the WO3/electrolyte interface which benefits the charge separation; (ii) doping or introducing oxygen vacancies to improve electrical conductivity; exposing high energy crystal surfaces to promote the consumption of photogenerated holes on the high-active crystal face, thereby suppressing the recombination of photogenerated electrons and holes; (iii) decorating with co-catalysts to reduce the overpotential which inhibits the formation of peroxo-species; (iv) other methods such as coupling with narrow band semiconductors to accelerate the charge separation and controlling the crystal phase via annealing to reduce defects. These methods are reviewed with detailed examples.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Beijing Natural Science Foundation; National Natural Science Foundation
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1546539
Alternate ID(s):
OSTI ID: 1559057
Journal Information:
Nanoscale, Journal Name: Nanoscale Journal Issue: 11 Vol. 2019; ISSN NANOHL; ISSN 2040-3364
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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  • Journal of the American Chemical Society, Vol. 123, Issue 43, p. 10639-10649 https://doi.org/10.1021/ja011315x
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Improved Charge Separation in WO3/CuWO4 Composite Photoanodes for Photoelectrochemical Water Oxidation journal May 2016

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Electrical and optical properties of titanium oxynitride thin films journal January 2020
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2D MXenes as Co-catalysts in Photocatalysis: Synthetic Methods journal September 2019
Reversibly switching water droplets wettability on hierarchical structured Cu2S mesh for efficient oil/water separation journal August 2019
Green Synthetic Fuels: Renewable Routes for the Conversion of Non-Fossil Feedstocks into Gaseous Fuels and Their End Uses journal January 2020
Selectivity of Tungsten Oxide Synthesized by Sol-Gel Method Towards Some Volatile Organic Compounds and Gaseous Materials in a Broad Range of Temperatures journal January 2020

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