Title: Hydroxyl Radical Suppression during Photoelectrocatalytic Water Oxidation on WO3|FeOOH

Journal Article · · Journal of Physical Chemistry. C
 [1]; ORCiD logo [2]
  1. Univ. of Michigan, Ann Arbor, MI (United States); University of Michigan, Ann Arbor
  2. Univ. of Michigan, Ann Arbor, MI (United States)

Depositing the earth-abundant water oxidation electrocatalyst FeOOH onto WO3 has been shown to increase the Faradaic efficiency of the tandem WO3|FeOOH photoanode to near 100% for the photoelectrocatalytic oxidation of water to oxygen. Here we begin to explore how this gain in Faradaic efficiency is imparted through hydroxyl radical trap and Tafel experiments. It was found that increasing the FeOOH deposition time of the WO3|FeOOH caused a decrease in the quantity of hydroxyl radical trapped during photoelectrocatalytic water oxidation. Finally, these results, along with the disparate Tafel slopes of bare WO3 and WO3|FeOOH, suggest a change in the water oxidation mechanism between the two materials.

Research Organization:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0006587
OSTI ID:
1780866
Journal Information:
Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 33 Vol. 124; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (41)

Ultrathin FeOOH Nanolayers with Abundant Oxygen Vacancies on BiVO 4 Photoanodes for Efficient Water Oxidation journal February 2018
Electrodeposition of WO3 on Ti substrate and the influence of interfacial oxide layer generated in situ: A photoelectrocatalytic degradation of propyl paraben journal January 2019
Electrochemical water oxidation on WO3 surfaces: A density functional theory study journal February 2019
Solvation effect promoted formation of p–n junction between WO3 and FeOOH: A high performance photoanode for water oxidation journal January 2016
Hydrogen production and simultaneous photoelectrocatalytic pollutant oxidation using a TiO2/WO3 nanostructured photoanode under visible light irradiation journal March 2016
Generation of OH radicals and oxidation mechanism in photocatalysis of WO3 and BiVO4 powders journal April 2015
The reaction of coumarin with the OH radical revisited: hydroxylation product analysis determined by fluorescence and chromatography journal February 2005
Efficient Photocatalytic Fuel Cell via Simultaneous Visible-Photoelectrocatalytic Degradation and Electricity Generation on a Porous Coral-like WO 3 /W Photoelectrode journal February 2019
Water Oxidation Catalysis for NiOOH by a Metropolis Monte Carlo Algorithm journal March 2018
Transparent Nanoparticulate FeOOH Improves the Performance of a WO 3 Photoanode in a Tandem Water-Splitting Device journal May 2016
Dual Mechanisms: Hydrogen Transfer during Water Oxidation Catalysis of Pure and Fe-Doped Nickel Oxyhydroxide journal July 2017
Kinetics and Faradaic Efficiency of Oxygen Evolution on Reduced H x WO 3 Photoelectrodes journal December 2018
Coumarin as a Quantitative Probe for Hydroxyl Radical Formation in Heterogeneous Photocatalysis journal February 2019
Understanding the Water Splitting Mechanism on WO 3 (001)—A Theoretical Approach journal October 2019
Unraveling the Kinetics of Photocatalytic Water Oxidation on WO 3 journal November 2019
Template Electro-Etching-Mediated FeOOH Nanotubes as Highly Efficient Photoactive Electrocatalysts for Oxygen Evolution Reaction journal September 2018
A Density Functional + U Assessment of Oxygen Evolution Reaction Mechanisms on β-NiOOH journal July 2017
Understanding the Phase-Induced Electrocatalytic Oxygen Evolution Reaction Activity on FeOOH Nanostructures journal October 2019
Effect of a Cobalt-Based Oxygen Evolution Catalyst on the Stability and the Selectivity of Photo-Oxidation Reactions of a WO 3 Photoanode journal March 2011
Mechanism and Activity of Water Oxidation on Selected Surfaces of Pure and Fe-Doped NiO x journal March 2014
Amorphous FeOOH Oxygen Evolution Reaction Catalyst for Photoelectrochemical Water Splitting journal February 2014
Operando Analysis of NiFe and Fe Oxyhydroxide Electrocatalysts for Water Oxidation: Detection of Fe 4+ by Mössbauer Spectroscopy journal November 2015
Oxygen Evolution Reaction Dynamics, Faradaic Charge Efficiency, and the Active Metal Redox States of Ni–Fe Oxide Water Splitting Electrocatalysts journal April 2016
Metal Oxide/(oxy)hydroxide Overlayers as Hole Collectors and Oxygen-Evolution Catalysts on Water-Splitting Photoanodes journal December 2018
Unraveling Oxygen Evolution on Iron-Doped β-Nickel Oxyhydroxide: The Key Role of Highly Active Molecular-like Sites journal November 2018
Mechanism of the OH Radical Generation in Photocatalysis with TiO 2 of Different Crystalline Types journal May 2014
Spectroelectrochemical study of water oxidation on nickel and iron oxyhydroxide electrocatalysts journal November 2019
Constructing the novel ultrafine amorphous iron oxyhydroxide/g-C3N4 nanosheets heterojunctions for highly improved photocatalytic performance journal August 2017
Composite Photocatalysts Containing BiVO4 for Degradation of Cationic Dyes journal August 2017
TiO2 Fibers Supported β-FeOOH Nanostructures as Efficient Visible Light Photocatalyst and Room Temperature Sensor journal June 2015
The importance of nickel oxyhydroxide deprotonation on its activity towards electrochemical water oxidation journal January 2016
Improving the stability and selectivity for the oxygen-evolution reaction on semiconducting WO 3 photoelectrodes with a solid-state FeOOH catalyst journal January 2016
The secret behind the success of doping nickel oxyhydroxide with iron journal January 2017
Earth-abundant elements doping for robust and stable solar-driven water splitting by FeOOH journal January 2017
Recent trend in visible-light photoelectrocatalytic systems for degradation of organic contaminants in water/wastewater journal January 2018
Ultrathin FeOOH nanosheets as an efficient cocatalyst for photocatalytic water oxidation journal January 2019
A quantitative assessment of the competition between water and anion oxidation at WO3 photoanodes in acidic aqueous electrolytes journal January 2012
Reduction Potentials of One‐Electron Couples Involving Free Radicals in Aqueous Solution journal October 1989
Synergy between Fe and Ni in the optimal performance of (Ni,Fe)OOH catalysts for the oxygen evolution reaction journal May 2018
Nanoporous BiVO4 Photoanodes with Dual-Layer Oxygen Evolution Catalysts for Solar Water Splitting journal February 2014
Standard electrode potentials involving radicals in aqueous solution: inorganic radicals (IUPAC Technical Report) journal December 2015